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4e304b9739d267859e8e5c64b2026d12e2257b40
subsection
8
58
Dual graphs and Cremona transformation
It is nonsingular for n=2,3, but singular for n\ge 4.The open set {\mathcal {U}} as above is the complement of the divisor \Sigma _n of (REF ). The inverse image of \Sigma _n in {\mathcal {G}}({\mathcal {C}}) can be described easily. It consists of the points((t_1:\cdots :t_n),(s_1:\cdots :s_n))such that\lbrace i \,| \...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.03552384302020073, 0.02418612129986286, -0.03903350234031677, -0.012947586365044117, 0.0216988418251276, -0.024064047262072563, 0.01281025167554617, 0.055055852979421616, -0.008804664015769958, 0.015808720141649246, -0.020081348717212677, 0.035737473517656326, 0.008827553130686283, -0.0...
944196ec154de964fe372d155e6b63cdd32847f0
subsection
9
58
Dual graphs and Cremona transformation
\pi _1:{\mathcal {G}}({\mathcal {C}})\rightarrow {\mathbb {P}}^{n-1} is the blow-up along {\mathcal {S}}_n. {\mathcal {L}} intersects every component of {\mathcal {S}}_n transversely. \Sigma _n cuts out a divisor with simple normal crossings on {\mathcal {L}}.(1) Notice that the definition (REF ) of the Cremona trans...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.05659257993102074, 0.017923526465892792, -0.028403067961335182, 0.010502423159778118, 0.007699489127844572, -0.07456187158823013, 0.031103037297725677, 0.06141286343336105, 0.017725223675370216, 0.03981310874223709, -0.02448277361690998, 0.028403067961335182, 0.02635902352631092, 0.0078...
df9989b755034799aadc16f87bdf35affdebf9b8
subsection
10
58
Dual graphs and Cremona transformation
Figure REF .We recall here a well known result (see e.g. , Proposition 8.3), which will be very useful in the following.Lemma 1.3 Suppose given a planar graph \Gamma with \#E(\Gamma )=n, with dual graph \Gamma ^\vee . Then the graph polynomials satisfy\Psi _\Gamma (t_1,\ldots ,t_n)= (\prod _{e\in E(\Gamma )} t_e)\,\, ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 120, "openalex_id": "", "raw": "S. Bloch, Motives associated to graphs, Japan J. Math., Vol.2 (2007) 165–196.", "source_ref_id": "8739e81c2d73dcd25eb98ce22dfe5fcca4eaef87", "start": 12 } ] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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9544012ef86b61f9c9454f773e6fcfac5c0c604b
subsection
11
58
Dual graphs and Cremona transformation
\end{array}The third equality uses the fact that \# E(\Gamma )=\#E(\Gamma ^\vee ) and \# V(\Gamma ^\vee )=b_0(S^2\setminus \Gamma ), so that \deg \Psi _\Gamma + \deg \Psi _{\Gamma ^\vee } = \# E(\Gamma ), and the fact that there is a bijection between complements of spanning tree T in \Gamma and spanning trees T^{\prim...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2227, "openalex_id": "", "raw": "A. Connes, D. Kreimer, Renormalization in quantum field theory and the Riemann–Hilbert problem I. The Hopf algebra structure of graphs and the main theorem, Comm. Math. Phys., Vol.210 (2000) 249–27...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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f658f23b1eb88768e4c02fda2aed09fe17d4d65c
subsection
12
58
Dual graphs and Cremona transformation
An explicit example of combinatorially inequivalent graphs with the same graph hypersurface, obtained as dual graphs of different planar embeddings of the same graph, is given in Figure REF .We see a direct application of this general result for planar graphs in §REF below, where we derive a relation between the classe...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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9b3ac06b7624f1f3a0558b6cc1d0e25f0af29158
subsection
13
58
An example: the banana graphs
In this paper we concentrate on a particular example, for which we can carry out complete and explicit calculations. We consider an infinite family of graphs called the “banana graphs”. The n-th term \Gamma _n in this family is a vacuum bubble Feynman graph for a scalar field theory with an interaction term of the form...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 682, "openalex_id": "", "raw": "D.R. Grayson, M.E. Stillman, Macaulay 2, a software system for research in algebraic geometry, available at http://www.math.uiuc.edu/Macaulay2/", "source_ref_id": "6e32dc48b4f94d2f9224a35aaa87...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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65af887b6252fd4ad7e4be5ac722f136c7ca1005
subsection
14
58
An example: the banana graphs
At present we do not have a conceptual explanation for this positivity phenomenon, but we can state the following tentative guess, based on the sparse numerical and theoretical evidence gathered so far.Conjecture 1.5 The coefficients of all the powers H^k in the CSM class of an arbitrary graph hypersurface X_\Gamma ar...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.054788313806056976, -0.004738654941320419, -0.040167924016714096, -0.02495233714580536, 0.0031877183355391026, -0.04987415298819542, 0.008073263801634312, 0.04251817241311073, 0.04108360409736633, -0.0012190018314868212, -0.024814985692501068, -0.0005355786415748298, -0.002262498019263148...
ffe4a13b2ec3ffaff99fafd616ac0c5d57d8e176
subsection
15
58
An example: the banana graphs
In fact, from (REF ) one sees that the determinant satisfies\det M_{\Gamma _n} (t)= (t_{n-1}+t_n)\, \det M_{\Gamma _{n-1}}(t) \, - t_{n-1}^2\, \det M_{\Gamma _{n-2}}(t) .It then follows by induction that the determinant satisfies the recursive relation\det M_{\Gamma _n}(t)= t_n \, \det M_{\Gamma _{n-1}}(t) \, + t_1 \cd...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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5235cc3449c32643834ca0762ad0cd1df010510b
subsection
16
58
An example: the banana graphs
This will depend on which scalar field theory the graph belongs to, but the resulting integral is unaffected by this, as long as we have nonzero external momenta flowing through the graph.Lemma 1.8 The Feynman integral (REF ) for the banana graphs \Gamma _n is of the formU(\Gamma ,p)= \frac{\Gamma ((1-D/2)(n-1) +1) C(...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1949, "openalex_id": "", "raw": "S. Bloch, E. Esnault, D. Kreimer, On motives associated to graph polynomials, Commun. Math. Phys., Vol.267 (2006) 181–225.", "source_ref_id": "1ab9b50d98e4ce8c593ec98f03fa8e6aa2c3049d", ...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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a8bd9feb700fea31b532fb8887dfce84faf831d2
subsection
17
58
An example: the banana graphs
In general, this type of regularization procedures requires a detailed knowledge of the singularities of the hypersurface X_\Gamma to be carried out, and that is one of the reasons for introducing invariants of singular varieties in the study of graph hypersurfaces.
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.05437476560473442, 0.0209321491420269, -0.027995986863970757, 0.0002979818091262132, -0.03466315194964409, 0.004634213168174028, -0.014669287018477917, 0.04482409358024597, 0.01186206005513668, -0.012609636411070824, -0.04064376279711723, -0.017743505537509918, 0.026958532631397247, 0.0...
c7331809d56b6b1ba7da07ec8694b1da47b657c9
subsection
18
58
Characteristic classes and the Grothendieck ring
In order to understand the nature of the part of the cohomology of the graph hypersurface complement that supports the period corresponding to the Feynman integral (ignoring divergence issues momentarily), one would like to decompose {\mathbb {P}}^{n-1}\setminus X_{\Gamma } into simpler building blocks. As in §8 of , t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 434, "openalex_id": "", "raw": "S. Bloch, E. Esnault, D. Kreimer, On motives associated to graph polynomials, Commun. Math. Phys., Vol.267 (2006) 181–225.", "source_ref_id": "1ab9b50d98e4ce8c593ec98f03fa8e6aa2c3049d", ...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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a69310eb373074964a1d345a00d6eba3ea0b957d
subsection
19
58
The Grothendieck ring
Let {\mathcal {V}}_K denote the category of algebraic varieties over a field K. The Grothendieck ring K_0({\mathcal {V}}_K) is the abelian group generated by isomorphism classes [X] of varieties, with the relation[X]=[Y]+[X\setminus Y],for Y\subset X closed. It is made into a ring by the product [X\times Y]=[X][Y].An a...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1354, "openalex_id": "", "raw": "H. Gillet, C.Soulé, Descent, motives and K-theory. J. Reine Angew. Math. 478 (1996), 127–176.", "source_ref_id": "0001f3df4ac8ef41a5061b023dc50bacbdcddf89", "start": 1204 } ] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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0112e0b89fc469a3c1a10dcb5e484d601f0f9dcc
subsection
20
58
The Grothendieck ring
Since the Lefschetz motive is invertible in K_0({\mathcal {M}}_K), its inverse being the Tate motive {\mathbb {Q}}(1), the ring homomorphism (REF ) induces a ring homomorphism\chi : K_0({\mathcal {V}}_K)[{\mathbb {L}}^{-1}] \rightarrow K_0({\mathcal {M}}_K).Thus, in the following we can either regard the classes [X_\Ga...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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a7abc87eaf8fad4407fc263d76d072a824981088
subsection
21
58
CSM classes as a measure of singularities
The Chern class of a nonsingular complete variety V is the `total homology Chern class' of its tangent bundle. We write c(V):=c(TV)\cap [V]_* to indicate the result of applying the Chern class of the tangent bundle of V to the fundamental class [V]_* of V. (We use the notation [V]_* rather than the more common [V] in o...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1912, "openalex_id": "", "raw": "W. Fulton, Intersection theory. Ergebnisse der Mathematik und ihrer Grenzgebiete (3) 2. Springer-Verlag, 1984. xi+470 pp.", "source_ref_id": "3a6208217520d26c921d4c23c0e41339de698fe0", ...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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8f750b9bb8fc1f2637789eb297aacdb0a9514637
subsection
22
58
CSM classes as a measure of singularities
First of all, c(X) must agree with its namesake when X is a complete nonsingular variety: that is, c(X)=c(TX)\cap [X]_* in this case. Secondly, associate with every variety X an abelian group F(X) of `constructible functions': elements of F(X) are finite integer linear combinations of functions {\bf 1}_Z (defined by {\...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1004, "openalex_id": "", "raw": "R.D. MacPherson, Chern classes for singular algebraic varieties. Ann. of Math. (2) 100 (1974), 423–432.", "source_ref_id": "e54088067d3abbdb0da711f39183bde1525e144f", "start": 955 }...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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ba7c652ca625096a577baf4db8bb9d8cb29dcf6a
subsection
23
58
CSM classes as a measure of singularities
This pushforward is understood in the table in §REF , and will be often understood in the explicit computations of §.
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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ff8d31cdd66c2d4ea2b5ea0960e3e32d89a7ac84
subsection
24
58
CSM classes versus classes in the Grothendieck ring
CSM classes are defined in by relating them to a different class, called `Chern-Mather class', by means of a local invariant of singularities known as the `local Euler obstruction'. As noted above, once the existence of the classes has been established, then their computation may be performed by systematic use of resol...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 182, "openalex_id": "", "raw": "R.D. MacPherson, Chern classes for singular algebraic varieties. Ann. of Math. (2) 100 (1974), 423–432.", "source_ref_id": "e54088067d3abbdb0da711f39183bde1525e144f", "start": 0 }, ...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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f17dcac4373b8f38660f1287120b81fd15c46e0a
subsection
25
58
CSM classes versus classes in the Grothendieck ring
This parallel cannot be taken too far, since the `embedded' Chern-Schwartz-MacPherson treated here is not an invariant of isomorphism classes.Example 2.1 Let Z_1 and Z_2 be, respectively, a linearly embedded {\mathbb {P}}^1 and a nonsingular conic in {\mathbb {P}}^2. Denoting by H the hyperplane class in {\mathbb {P}}^...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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768b48ed45cad6f691ae2d765b5d761850fdf8ba
subsection
26
58
CSM classes versus classes in the Grothendieck ring
With notation as above, assumec(X)=\sum a_i H^{-i}\quad .Then the class of X in the Grothendieck group of varieties equals[X]= \sum a_i {\mathbb {T}}^i ,where {\mathbb {T}}=[{\mathbb {G}}_m] is the class of the multiplicative group, see §.Thus, adopting a variable T=H^{-1} in the CSM environment, and T={\mathbb {T}} in...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1635, "openalex_id": "", "raw": "P. Aluffi, Modification systems and integration in their Chow groups. Selecta Math. (N.S.) 11 (2005), no. 2, 155–202.", "source_ref_id": "bdd07b2e67a3b9f2469ba3083bf244d67773ad6c", "sta...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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c492b6fe8619d37299951ebdea128b763f9023f1
subsection
27
58
Banana graphs and their motives
In this section we give an explicit formula for the classes [X_{\Gamma _n}] of the banana graph hypersurfaces X_{\Gamma _n} in the Grothendieck ring. The procedure we adopt to carry out the computation is the following. We use the Cremona transformation of (REF ). Consider the algebraic simplex \Sigma _n placed in the ...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.045893315225839615, 0.013861062936484814, -0.030300574377179146, -0.006877131760120392, 0.011839499697089195, -0.03646443784236908, 0.05080609768629074, 0.009474650956690311, 0.006552918814122677, 0.005561207886785269, -0.002033006865531206, 0.03454204276204109, 0.008933024480938911, -0...
aaf86abea4b7770365e3fa895ad809c75623e748
subsection
28
58
Banana graphs and their motives
In fact, the variables P^i satisfy a different multiplication rule, which we denote by \bullet and which is given byP^i \bullet P^j = P^{i+j}+P^{i+j-1}+\cdots +P^j-P^{i-1}-\cdots -1and which recovers in this way the class [{\mathbb {P}}^i\times {\mathbb {P}}^j]. This follows from Lemma REF , by converting each of the t...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.04159864783287048, 0.017884671688079834, -0.03979797288775444, 0.013833153061568737, 0.04449804127216339, -0.028597163036465645, 0.00998001266270876, 0.012070626951754093, 0.005054861307144165, 0.017472652718424797, -0.03750897943973541, 0.0005703409551642835, -0.04135448858141899, -0.0...
975f7073c53a6b43385c10392604370b47003bf2
subsection
29
58
Banana graphs and their motives
In terms of classes [{\mathbb {P}}^r] it corresponds to mapping [{\mathbb {P}}^0] to zero and [{\mathbb {P}}^r] to [{\mathbb {P}}^{r-1}] for r\ge 1.One can see that, for g({\mathbb {T}})=[{\mathbb {P}}^r]=\frac{(1+{\mathbb {T}})^{r+1}-1}{{\mathbb {T}}}, we have\frac{g({\mathbb {T}})-g(-1)}{{\mathbb {T}}+1}=\frac{\frac{...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.05279020592570305, -0.009604460559785366, -0.0031544435769319534, -0.003484382526949048, 0.04833507910370827, -0.004676357842981815, 0.06548427045345306, 0.01742381975054741, 0.00788038782775402, 0.03335242345929146, -0.014257933013141155, 0.009985893033444881, -0.023145301267504692, 0....
97b23d2a4784c756c6f44a74d1be146c73a9e661
subsection
30
58
Banana graphs and their motives
One then applies the transformation {\mathcal {H}} of (REF ) to obtain\begin{array}{ll} [{\mathcal {L}}\cap \Sigma _{r+1}] &=\left(\frac{(1+{\mathbb {T}})^{r+1}-1-{\mathbb {T}}^{r+1}}{{\mathbb {T}}}-\frac{-1-(-1)^{r+1}}{-1}\right)/({\mathbb {T}}+1) \\[3mm] &=\frac{(1+{\mathbb {T}})^r-1}{{\mathbb {T}}}- \frac{{\mathbb {...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.0325591042637825, 0.011542156338691711, -0.015371741726994514, 0.009413762018084526, 0.02074994519352913, 0.00877295434474945, 0.025388168171048164, 0.03101811558008194, -0.006953520234674215, 0.00021348317386582494, 0.004874711390584707, 0.022123102098703384, 0.004592450801283121, 0.03...
481a2480fbb7bef84d8e02dbce436a768f28e387
subsection
31
58
Banana graphs and their motives
This hyperplane intersects \Sigma _n transversely, so that (REF ) applies and gives[{\mathcal {L}}\setminus \Sigma _n]=[{\mathcal {L}}]-[{\mathcal {L}}\cap \Sigma _n]=\frac{{\mathbb {T}}^{n-1}-(-1)^{n-1}}{{\mathbb {T}}+1}.Next we examine how the graph hypersurface X_{\Gamma _n} intersects the algebraic simplex \Sigma _...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.07665888965129852, 0.012199199758470058, -0.009322965517640114, -0.0436394140124321, 0.013702165335416794, 0.006332292687147856, 0.014327765442430973, -0.0218807402998209, 0.00590123888105154, 0.009277190081775188, -0.009712058119475842, 0.0029143805149942636, -0.01545689720660448, 0.01...
b7d36faeef65cbd1d26d4446b8fe4a61f98d90eb
subsection
32
58
Banana graphs and their motives
We then have[{\mathcal {S}}_{r+1}] = [\Sigma _{r+1}]- (r+1){\mathbb {T}}^{r-1} =\frac{(1+{\mathbb {T}})^{r+1}-1-(r+1){\mathbb {T}}^r-{\mathbb {T}}^{r+1}}{{\mathbb {T}}}.This gives the formula (REF ).We then have the following result.Theorem 3.10 The class in the Grothendieck ring of the graph hypersurface X_{\Gamma _n...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.04146862402558327, 0.013014251366257668, -0.025616563856601715, -0.018918724730610847, 0.02885105460882187, -0.0077238744124770164, 0.014463669620454311, 0.008521054871380329, -0.009909444488584995, 0.030437786132097244, 0.005450576078146696, 0.014189043082296848, -0.004920394159853458, ...
f05c8b94198faf0b3885dd061f27eee262fe0f3a
subsection
33
58
Banana graphs and their motives
The class in the Grothendieck ring is[X_{\Gamma _4}]= {\mathbb {T}}^2 + 5{\mathbb {T}}+ 5 .In terms of the Lefschetz motive {\mathbb {L}}, the formula (REF ) reads equivalently as[X_{\Gamma _n}]= \frac{{\mathbb {L}}^n-1}{{\mathbb {L}}-1}-\frac{({\mathbb {L}}-1)^n-(-1)^n}{{\mathbb {L}}}-n\, ({\mathbb {L}}-1)^{n-2} .In t...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.08954776078462601, 0.011765733361244202, 0.01796143688261509, -0.028933631256222725, 0.014115828089416027, -0.030856436118483543, 0.02765176258981228, 0.049687713384628296, 0.0019666780717670918, 0.00333820260129869, -0.01698477379977703, 0.03201622515916824, -0.023714590817689896, -0.0...
2fc0b92b455c0fd28476b8f7fe8b9b3eae30ea7e
subsection
34
58
Banana graphs and their motives
Then the formula (REF ) for the class of the hypersurface complement shows that\chi ({\mathbb {P}}^{n-1}\setminus X_{\Gamma _n})= \chi ({\mathbb {T}}^{n-1})+(n-1) \chi ({\mathbb {T}}^{n-2})+\chi ({\mathbb {T}}^{n-3})-\cdots \pm 1 = (-1)^{n-1}.Since \chi ({\mathbb {P}}^{n-1})=n we obtain\chi (X_{\Gamma _n})= \chi ({\mat...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.049714360386133194, -0.0067292917519807816, -0.01576271653175354, -0.01579323597252369, -0.009239424020051956, -0.019546989351511, 0.03714080527424812, 0.06689617782831192, 0.00836202222853899, -0.005966333206743002, -0.009536977857351303, 0.02348385378718376, -0.01172666810452938, 0.00...
5044a1f939a23f960d3c557e8469e69e186c8ba6
subsection
35
58
Banana graphs and their motives
However, how geometrically one can associate a {\mathbb {P}}^n to a graph hypersurface X_{\Gamma _n}\subset {\mathbb {P}}^{n-1} is unclear, so that a satisfactory conceptual explanation of the occurrence of (REF ) in (REF ) is still missing.For completeness we also give the explicit formula of the class (REF ) written ...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.06647378206253052, -0.002886100672185421, -0.010933991521596909, -0.035068124532699585, 0.010583004914224148, 0.009980224072933197, 0.0223410502076149, 0.037540290504693985, 0.022356310859322548, 0.02331770956516266, -0.016160637140274048, 0.04031766206026077, -0.034518755972385406, 0.0...
bdf10ea46b1f31a2a22be51d9e3a1c2793f657fb
subsection
36
58
Classes of dual graphs
In the result obtained above, we used essentially the relation between the graph hypersurface X_{\Gamma _n} and the hypersurface of the dual graph, which is, in this case, a hyperplane. More generally, although one cannot obtain an explicit formula, one can observe that for any given planar graph the relation between t...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.06251548230648041, -0.0022321506403386593, -0.01359131745994091, -0.03983530402183533, -0.00361722894012928, -0.01947503723204136, 0.013774468563497066, 0.02902940660715103, 0.010431965813040733, 0.015812020748853683, -0.0038385360967367887, 0.014896267093718052, -0.02170337364077568, 0...
1ee108aa2d5a9357bc4456d5ac7f47e97227a5e1
subsection
37
58
CSM classes for banana graphs
We now give an explicit formula for the Chern–Schwartz–MacPherson class of the hypersurfaces of the banana graphs, for an arbitrary number of edges.The computation of the CSM class is substantially more involved than the computation of the class in the Grothendieck ring we obtained in the previous section, although the...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.03800401836633682, -0.02463393099606037, -0.028358018025755882, 0.02944166772067547, 0.020513013005256653, -0.0630042552947998, 0.015125294215977192, -0.00045954910456202924, 0.007539753336459398, 0.021276146173477173, -0.025656528770923615, 0.033974677324295044, 0.017124703153967857, -...
a2883c0dda6404effc439dae8207058f1bf2a69f
subsection
38
58
Characteristic classes of blowups
Let D be a divisor with simple normal crossings and nonsingular components D_i, i=1,\dots ,r, in a nonsingular variety M. Then TM(-\log (D)) denotes the sheaf of vector fields with logarithmic zeros (i.e. the dual of the sheaf \Omega ^1_M(\log D) of 1-forms with logarithmic poles). In terms of Chern classes one has (cf...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 380, "openalex_id": "", "raw": "P. Aluffi, Modification systems and integration in their Chow groups. Selecta Math. (N.S.) 11 (2005), no. 2, 155–202.", "source_ref_id": "bdd07b2e67a3b9f2469ba3083bf244d67773ad6c", "star...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.07002920657396317, -0.006422142032533884, -0.05137713626027107, 0.009974734857678413, 0.03069501556456089, -0.004544724244624376, -0.01566041074693203, 0.012882443144917488, -0.006811362691223621, 0.03016079030930996, -0.024589592590928078, 0.013622725382447243, 0.017400456592440605, 0....
6dfe2305afd09ac0b4dfeb159849aa16d4ad1b47
subsection
39
58
Characteristic classes of blowups
Thus, we obtain (REF ).One derives directly from this result the following formula for Chern classes.Corollary 4.2 Under the same hypothesis as Theorem REF , the Chern classes satisfy\frac{c(TW)}{(1+F)\prod _{j\in J}(1+F_j)} \cap [W] =\pi ^*\left(\frac{c(TV)}{\prod _{j\in J}(1+E_j)}\cap [V]\right) .In other words, if ...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.037132203578948975, -0.009694952517747879, -0.022715633735060692, 0.02561420388519764, 0.021724017336964607, -0.005034357775002718, -0.02526332437992096, 0.008260923437774181, 0.0030415912624448538, 0.041922472417354584, -0.024531053379178047, -0.0026163405273109674, -0.01280710194259882,...
c14da6ae98b8fd71c7f42bed2a49f6a62fc6a8f5
subsection
40
58
Characteristic classes of blowups
By Corollary REF , we have the identityc(T\tilde{V}(-\log \tilde{E}))\cap [\tilde{V}]=\tilde{\pi }^*(c(TV(-\log E))\cap [V]) =\alpha ^* \pi ^* (c(TV(-\log E))\cap [V]) .As in (REF ) of §REF , this is saying thatc({\bf 1}_{\tilde{\pi }^{-1}(U)})=\alpha ^* \pi ^*( c({\bf 1}_U)).The statement then follows by pushing forwa...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 712, "openalex_id": "", "raw": "R.D. MacPherson, Chern classes for singular algebraic varieties. Ann. of Math. (2) 100 (1974), 423–432.", "source_ref_id": "e54088067d3abbdb0da711f39183bde1525e144f", "start": 569 } ...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.035212308168411255, -0.020611708983778954, -0.009405713528394699, 0.016065234318375587, 0.009581165388226509, -0.00029559724498540163, -0.006804457865655422, 0.04671580716967583, 0.021969549357891083, 0.030421724542975426, 0.006854041945189238, 0.006445927079766989, 0.0012939531588926911,...
e372f7f50f7375639cd99c8f9e520867b1d5b0fb
subsection
41
58
Computing the characteristic classes
In this section we give the explicit formula for the CSM class of the graph hypersurface X_{\Gamma _n} of the banana graph \Gamma _n. The procedure is somewhat similar conceptually to the one we used in the computation of the class in the Grothendieck ring, namely we will use the inclusion–exclusion property of the Che...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1303, "openalex_id": "", "raw": "P. Aluffi, Classes de Chern des variétés singulières, revisitées. C. R. Math. Acad. Sci. Paris 342 (2006), no. 6, 405–410.", "source_ref_id": "9f2c98f33c535e85d9de9775f65982083dd7229b", ...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.05406610667705536, 0.004839862696826458, -0.025324419140815735, -0.0061022695153951645, 0.019603541120886803, -0.03594236820936203, 0.007177794352173805, 0.0026869054418057203, 0.026605894789099693, 0.02468368038535118, -0.001445475034415722, 0.03713231161236763, 0.03877992182970047, -0...
a3ce5f93d5fb7bd3feb97672c9fb109523b7e009
subsection
42
58
Computing the characteristic classes
By (2) and (3) of Lemma REF , we know that \pi _1^{-1}({\mathcal {L}}) is the blowup of {\mathcal {L}} along {\mathcal {L}}\cap {\mathcal {S}}_n, that is, the singularity subscheme of {\mathcal {L}}\cap \Sigma _n. The blowup of a variety along the singularity subscheme of a divisor with simple normal crossings is domin...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.047938570380210876, 0.011671867221593857, -0.01917847990989685, -0.020872045308351517, 0.03500034660100937, -0.018507156521081924, -0.01277802512049675, 0.04650438204407692, -0.005092138424515724, 0.0006808589096181095, -0.04113379865884781, 0.022367265075445175, 0.010359736159443855, 0...
b8175c28d7d8d94b5bde6c5d41da8a226355b559
subsection
43
58
Computing the characteristic classes
Since the CSM class of a divisor with normal crossings is computed by the Chern class of the bundle of vector fields with logarithmic zeros along the components of the divisor, we findc({\mathcal {L}}\setminus \Sigma _n)= \frac{c(T{\mathcal {L}})\cap [{\mathcal {L}}]_*}{(1+h)^n} =\frac{(1+h)^{n-1}}{(1+h)^n}\,h\cdot [{\...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.046089958399534225, -0.022709224373102188, -0.03943591192364693, -0.012132951989769936, 0.026372002437710762, -0.010812826454639435, 0.003330838866531849, 0.02469322830438614, -0.0016625578282400966, 0.009248514659702778, -0.009874239563941956, 0.019473770633339882, 0.022617654874920845, ...
8d25efd0bbb1ff893eae773dc925afe9a7145a19
subsection
44
58
Computing the characteristic classes
Thus, we obtainc(X_{\Gamma _n}\setminus \Sigma _n)={\pi _2}_* \left(\sum _{i=1}^{n-1} (-1)^{i-1}h^i (h+H)^{n-1}\cdot [{\mathbb {P}}^{n-1}\times {\mathbb {P}}^{n-1}]_* \right).Finally, we have to evaluate the pushforward via \pi _2. We can writec(X_{\Gamma _n}\setminus \Sigma _n) = \sum _{i=1}^{n-1} a_i H^i\cdot [{\math...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.06958232074975967, 0.004215376451611519, -0.02020328864455223, -0.00895719788968563, 0.015198243781924248, 0.017593951895833015, -0.006370749790221453, 0.061189718544483185, 0.008751197718083858, 0.021454548463225365, -0.03280745446681976, 0.021500326693058014, -0.0012426776811480522, -...
79c82807fe02f30c5488dbefdfb4dee32698837a
subsection
45
58
Computing the characteristic classes
Thus, banana graphs provide an infinite family of graphs for which Conjecture REF holds.Remark 4.11 As pointed out in §REF , CSM classes are defined (as classes in the Chow group of an ambient variety) for locally closed subsets. It follows from Theorem REF that the CSM class of the complement of X_{\Gamma _n} in {\mat...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.039154741913080215, -0.017242735251784325, -0.01458765845745802, -0.0013532876037061214, 0.009124916046857834, -0.03472961485385895, 0.032379720360040665, 0.006031142547726631, -0.011268814094364643, 0.002555892104282975, -0.004222943913191557, 0.010658451355993748, 0.000839248183183372, ...
ec404dfe7075655556b2009fa9b3a50a620db205
subsection
46
58
The CSM class and the class in the Grothendieck ring
We discuss here the formal similarity, as well as the discrepancy, between the expression for the CSM class and the formula for the class in the Grothendieck ring of the graph hypersurface X_{\Gamma _n}.As noted in Propostion REF , the CSM class and the class in the Grothendieck group carry the same information for sub...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.05409357696771622, 0.0024903486482799053, -0.04603903368115425, -0.016765043139457703, 0.03191307559609413, -0.039021819829940796, 0.028023095801472664, 0.02240932360291481, 0.0025246720761060715, 0.025628089904785156, 0.012745398096740246, -0.007840975187718868, -0.0002655291464179754, ...
df3e27c19ff44857dc7fed5bc994051ebe707ff7
subsection
47
58
Classes of cones
We make here a general observation which may be useful in other computations of CSM classes and classes in the Grothendieck ring for graph hypersurfaces. One can observe that often the graph hypersurfaces X_\Gamma happen to be cones over hypersurfaces in smaller projective spaces.There are simple operations one can per...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.04426189512014389, 0.011012054048478603, -0.0536026805639267, 0.0000504385243402794, -0.0027377507649362087, -0.028693916276097298, -0.01822368986904621, 0.022161472588777542, 0.03879784047603607, 0.010500752367079258, 0.017933698371052742, 0.01823895238339901, 0.0286633912473917, -0.02...
16626013697e77fedb666cb51217532406fa4ed7
subsection
48
58
Classes of cones
Then, by Claim 1 of we havef(H)\cap [{\mathbb {P}}^m]_* =i_* c(X)=H\cdot (1+H)^{-1} \cap j_* c(C(X)) =H(1+H)^{-1} g(H) \cap [{\mathbb {P}}^{m+1}]_* .This implies(1+H) f(H) \cap [{\mathbb {P}}^m]_* = g(H)\cap [{\mathbb {P}}^m]_* .This determines all the coefficients in g(H) with the exception of the coefficient of H^{m+...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 150, "openalex_id": "", "raw": "P. Aluffi, MacPherson's and Fulton's Chern classes of hypersurfaces, Internat. Math. Res. Notices, Vol.11 (1994) 455–465.", "source_ref_id": "2bba1235fb52dffdb939d278f5ad8772efa586e8", "...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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19a9592c8d91973f57c634f5cabcf67f4f7f8759
subsection
49
58
Classes of cones
Doubling a disconnecting edge in a non-1PI graph.In these cases the resulting graph hypersurface is obtained by first taking a cone over the original hypersurface in one extra dimension and then taking the union with a transversal hyperplane, respectively given by the vanishing of the coordinate corresponding to the lo...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.06261815130710602, -0.023878511041402817, -0.04189801216125488, 0.005195292644202709, -0.020796427503228188, -0.014990822412073612, 0.009139442816376686, 0.034726832062006, -0.0021685196552425623, 0.02821173518896103, -0.033475689589977264, -0.01862981542944908, 0.005675914231687784, 0....
2acb69ab9da9051f0a46ea978918df650ac193c1
subsection
50
58
Classes of cones
Given a pair of 1PI graphs \Gamma _1 and \Gamma _2 and two additional edges joining them as in Figure REF , the graph polynomial becomes of the form\Psi _\Gamma (t)=(t_1+t_2)\Psi _{\Gamma _1}(t_3,\ldots ,t_{n_1+2})\Psi _{\Gamma _2}(t_{n_1+3}, \ldots , t_{n_1+n_2+2}) +\Psi _{\Gamma _1,\Gamma _2}(t_3,\ldots ,t_{n_1+n_2+2...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.03634902462363243, 0.012879335321485996, -0.03802761062979698, -0.00904147606343031, 0.007164511829614639, -0.04870952293276787, 0.010918441228568554, 0.028963245451450348, 0.02581970952451229, 0.008095364086329937, -0.016495926305651665, -0.0009928456274792552, 0.004078201949596405, -0...
0eafa751083e5f2329e3eff14377846fe7e3cbc9
subsection
51
58
Classes of cones
Then\begin{array}{rl} c({\mathbb {P}}^n\setminus X_{\hat{\Gamma }}) = & (1+H)g(H)\cap [{\mathbb {P}}^n]_* \\[2mm] c({\mathbb {P}}^n\setminus X_{\Gamma ^{\prime }}) = & g(H)\cap [{\mathbb {P}}^n]_* \end{array}Similarly, the classes in the Grothendieck group satisfy\begin{array}{rl} [{\mathbb {P}}^n\setminus X_{\hat{\Gam...
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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621b4c17a1498e32b6285052b89616f78eb0510c
subsection
52
58
Classes of cones
The class for the `banana split' graph is{\mathbb {T}}^n+n{\mathbb {T}}^{n-1}+n{\mathbb {T}}^{n-2}-(-1)^n . [Figure: Banana split graph.]
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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35cad4b252ee71bac1430c106e234503c7886b07
subsection
53
58
Banana graphs in Noncommutative QFT
Recently there has been growing interest in investigating the renormalization properties and the perturbative theory for certain quantum field theories on noncommutative spacetimes. These arise, for instance, as effective limits of string theory , . In particular, in dimension D=4, when the underlying {\mathbb {R}}^4 i...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 249, "openalex_id": "", "raw": "A.Connes, M.Douglas, A.Schwarz, Noncommutative geometry and matrix theory: compactification on tori. JHEP 9802 (1998) 3–43.", "source_ref_id": "d9d8412798ea32acb6a2b5ed8a4ae7c06de093a1", ...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
[ -0.03072868473827839, 0.02192508429288864, -0.0236186720430851, -0.004291182849556208, -0.01315962802618742, -0.05822277069091797, 0.012823961675167084, 0.04409429058432579, 0.037655606865882874, 0.030667655169963837, -0.059046678245067596, 0.017927609384059906, 0.0028398095164448023, 0.00...
bbe3340a0af37e15e749e998c7c0799ca9d233ca
subsection
54
58
Banana graphs in Noncommutative QFT
The hypersurface corresponding to the value s = 0 has a singularity at the origin 0\in {\mathbb {A}}^n whose tangent cone is the (affine) graph hypersurface X_\Gamma .This follows directly from the relation between the graph polynomial for the ribbon graph \tilde{\Gamma } given in and the Kirchhoff polynomial \Psi _\G...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 326, "openalex_id": "", "raw": "R. Gurau, V. Rivasseau, Parametric Representation of Noncommutative Field Theory, Commun. Math. Phys. Vol. 272 (2007) N.3, 811–835", "source_ref_id": "ab54b3a86acf3a0d5a821c23c8edf6ed225e347d"...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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b12babf95b79e70560a66cbffd0bd756f90c83e9
subsection
55
58
Banana graphs in Noncommutative QFT
Notice also how, at the limit value s= 0 of the parameter, the two polynomials for the two different ribbon graphs corresponding to the third banana graph \Gamma _3 agree.For each value of the parameter s=(4\theta \Omega )^{-1} one obtains in this way an affine hypersurface, which is a curve in {\mathbb {A}}^2 or a sur...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1671, "openalex_id": "", "raw": "P. Aluffi, Limits of Chow groups, and a new construction of Chern-Schwartz-MacPherson classes. Pure Appl. Math. Q. 2 (2006), no. 4, 915–941.", "source_ref_id": "8827baa619e454a1d9a2b3189661cc...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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dcfc167654f8a67c7707f8041b9e65a48308c6e3
subsection
56
58
Banana graphs in Noncommutative QFT
For general values of the parameter s=(4\theta \Omega )^{-1} the CSM class is given byc(\bar{X}_{\tilde{\Gamma }_3})= 14H^3 + 4H.For the special value s=1/2 of the parameter, the CSM class becomes of the formc(\bar{X}_{\tilde{\Gamma }_3})|_{s=1/2}= 5H^3 + 5H^2 + 4H,while in the limit s\rightarrow 0 one hasc(\bar{X}_{\t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2812, "openalex_id": "", "raw": "D. Broadhurst, D. Kreimer, Association of multiple zeta values with positive knots via Feynman diagrams up to 9 loops, Phys. Lett. B, Vol.393 (1997) 403–412.", "source_ref_id": "d29d0ef6dc447...
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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0864616f8769265e3abfcf31fe6108e115e17024
subsection
57
58
Banana graphs in Noncommutative QFT
It would be interesting to see whether it also has an effect on invariants such as the CSM class.
{ "cite_spans": [] }
0807.1690
Feynman motives of banana graphs
[ "Paolo Aluffi", "Matilde Marcolli" ]
[ "hep-th", "math-ph", "math.AG", "math.MP" ]
2,008
en
Physics
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8c558ae26b22a5bc3e8f0b5bfa0cbb95be1a4fe7
abstract
0
16
Abstract
In this paper, we investigate the atom-molecule conversion dynamics of a generalized many-body model that includes the atom-atom, atom-molecule, and molecule-molecule interactions, emphasizing the efficiency of the Feshbach molecular formation. We show that the picture of two-body molecular production depicted by the L...
{ "cite_spans": [] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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4f266cebc0cbdfe31927c71e06e5f0786ff31f89
subsection
1
16
introduction
The production of ultracold diatomic molecules in bosonic systems is an exciting area of research with important applications ranging from the production of molecular Bose-Einstein condensates (BECs) to the study of chemical reaction dynamics. A widely used production technique involves the association of ultracold ato...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 243, "openalex_id": "", "raw": "S. Inouye, M. R. Andrews, J. Stenger, H. -J. Miesner, D. M. Stamper-Kum, and W. Ketterle, Nature (London) 392, 151 (1998).", "source_ref_id": "8ee1d60ed3fcee226efa2eafe822284fa37365bd", ...
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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7d90c8bc6a929bb3609991cbc6b9513f335b47b2
subsection
2
16
Model
A widely used molecular production technique involves the association of ultracold atom pairs (open channel) into very weakly bound diatomic molecules (close channel) by applying a time varying magnetic field in the vicinity of a Feshbach resonance, . Precisely speaking, atoms are converted into molecules at an avoided...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 251, "openalex_id": "", "raw": "E. Timmermans, P. Tommasini, M. Hussein, and A. Kerman, Phys. Rep. 315, 199 (1999).", "source_ref_id": "09e46148dc2fe0e3e7e33e9f3c2946a0d9137aab", "start": 0 }, { "arxiv_id...
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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010e93180a7bee38cdee8ffa69193290436f3c75
subsection
3
16
Model
Here, N_{a}=\hat{a}^{\dagger }\hat{a} and N_{b}=\hat{b}^{\dagger }\hat{b} are the atom number and molecule number, respectively. We introduce the parameter V to denote the quantized volume of the trapped particles, therefore n=N/V is the mean density of the initial bosonic atoms.Choosing the Fock states as the basis, t...
{ "cite_spans": [] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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6fdcf75f65f1106f1efa02a9f633a7db6bcd275c
subsection
4
16
Model
When the external magnetic field is linearly swept across the Feshbach resonance at \Delta \simeq 0, a fraction of atoms will be converted to molecules at the avoided-crossing of energy levels. The conversion efficiency as a function of the sweeping rate (i.e., \alpha =\dot{\Delta }=\mu _{co}\dot{B}/4 ) and coupling st...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 407, "openalex_id": "", "raw": "L. D. Landau, Phys. Z. Sowjetunion 2, 46 (1932); G. Zener, Proc. R. Soc. London, Ser. A 137, 696 (1932).", "source_ref_id": "d13ef9e517982105e494d5437b869ad5bb85fa5a", "start": 194 }...
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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f577259d78bb866034996e7358fe867a8698a16d
subsection
5
16
Many-body effects (
As the total particle number N increases, Eq.(REF ) is no longer analytically solvable. In addition, the computational demand increases dramatically as N becomes very large. In the mean-field limit where N\rightarrow \infty , the quantum fluctuation is negligible. It is appropriate to replace all the quantum operators ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2088, "openalex_id": "", "raw": "Jie Liu, Li-Bin Fu, Bi-Yiao Ou, Shi-Gang Chen, and Qian Niu, arXiv:quant-ph/0105140v1; Jie Liu, Libin Fu, Bi-Yiao Ou, Shi-Gang Chen, Dae-Il Choi, Biao Wu and Qian Niu, Phys. Rev. A 66, 023404 (2002...
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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17884f3390607ad1fe1cfe9cebf72307677060c4
subsection
6
16
Many-body effects (
In addition, the absence of hermicity as well as the lack of U(1) invariance of the Hamiltonian restrict the mean-field motion to a “tear-drop” shaped equal-single-pair-entropy surface, , rather than the surface of a Bloch sphere. As we will show latter, the interplay of these new features leads to a very different ene...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 230, "openalex_id": "", "raw": "I. Tikhonenkov, E. Pazy, Y. B. Band, M. Fleischhauer, and A. Vardi, Phys. Rev. A 73, 043605 (2006).", "source_ref_id": "5ea2163524db1038b5f0d742ade249f800ab2469", "start": 0 }, {...
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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8aaa27bb218a61b3181d9bc056bc0668c8ea19ee
subsection
7
16
General properties
We first show how the nonlinear interactions lead to the deformation of the eigen-energy levels. The eigen-states of the system satisfy thatH\left( \begin{array}{c} a \\ b\end{array}\right) =\mu \left( \begin{array}{c} a \\ 2b\end{array}\right) .Solving the above nonlinear equations together with total particle conserv...
{ "cite_spans": [] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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0199e6a0364423f6ddfd61b61f36b5d44139d9ef
subsection
8
16
General properties
The conversion efficiency as a function of the sweeping rate \alpha is plotted against the nonlinear parameters ranging from weak nonlinearity to strong nonlinearity. Fig.REF shows that (1) the nonlinear interaction always suppresses the conversion from atoms to molecules. For example, in the case of strong nonlinearit...
{ "cite_spans": [] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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0290bfadf5651b636c2a18ff9f990b4281a3c9ff
subsection
9
16
Adiabatic limit
In the adiabatic limit where the external field varies slowly compared with the intrinsic motion of the system, the conversion dynamics are entirely determined by the phase-space structure evolution of the classical Hamiltonian (REF ). The fixed points (i.e., the energy extrema of the classical Hamiltonian) on the phas...
{ "cite_spans": [] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
[ -0.002997877076268196, 0.018856875598430634, -0.04045989736914635, -0.003825535299256444, -0.003457475220784545, -0.016736239194869995, -0.014173169620335102, 0.03396068513393402, 0.051413971930742264, -0.0014598440611734986, -0.045494500547647476, 0.0012166956439614296, 0.01852123625576496,...
bde18345aad97b2cc6a40dc8647b01f7e9f87697
subsection
10
16
Adiabatic limit
\frac{\partial \dot{\theta }}{\partial S}\right|_{S_{c}}=-4U+\Omega \frac{5-3S_{c}}{2(1-S_{c})^{3/2}}=0.The critical energy bias \Delta _{c} and obit energy \mathcal {H}_{c} can be obtained through Eq.() and Eq.(REF ), respectively\Delta _{c} &=&2US_{c}+\Omega \frac{1-3S_{c}}{2\sqrt{1-S_{c}}}, \\ \mathcal {H}_{c} &=&-2...
{ "cite_spans": [] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
[ -0.013029282912611961, 0.04473285749554634, -0.057243410497903824, -0.016996044665575027, -0.0022484667133539915, -0.027248594909906387, -0.0018556049326434731, 0.00065842509502545, 0.026455242186784744, 0.01577550172805786, -0.021695129573345184, -0.0035395710729062557, 0.03570084646344185,...
69f0aadf96789ad2506391e4e421e477f01f176a
subsection
11
16
Adiabatic limit
For this purpose, we introduce a small variable \delta =U/\Omega -\sqrt{2}/4, and calculate the critical values with perturbation theory,S_{c} &=&-1+\frac{16\sqrt{2}}{3}\delta -\frac{256}{9}\delta ^{2}+\frac{5888\sqrt{2}}{81}\delta ^{3}, \\ \Delta _{c}/\Omega &=&\frac{\sqrt{2}}{2}-2\delta +\frac{16\sqrt{2}}{3}\delta ^{...
{ "cite_spans": [] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
[ -0.049856122583150864, 0.03801758214831352, -0.03694967180490494, -0.019207118079066277, -0.0176052525639534, -0.017528973519802094, -0.0006793621578253806, 0.005987921729683876, 0.029489561915397644, -0.003928381949663162, -0.016766181215643883, 0.00010404967906652018, 0.004130521789193153,...
e642454fc41c19ba68672a5fffeda6347ec30704
subsection
12
16
Adiabatic limit
After integrating Eq.(REF ), we finally come to a power law of the conversion efficiency,\chi \sim 1.2\lambda ^{2/3}=1.2\left( \frac{U}{\Omega }\right) ^{-2/3}, \frac{U}{\Omega }>>1.We would like to mention that, in the nonlinear Landau-Zener model describing the tunneling dynamics of BEC atoms in a double-well potenti...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 427, "openalex_id": "", "raw": "Jie Liu, Li-Bin Fu, Bi-Yiao Ou, Shi-Gang Chen, and Qian Niu, arXiv:quant-ph/0105140v1; Jie Liu, Libin Fu, Bi-Yiao Ou, Shi-Gang Chen, Dae-Il Choi, Biao Wu and Qian Niu, Phys. Rev. A 66, 023404 (2002)...
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
[ -0.051701489835977554, 0.020921707153320312, -0.00026729158707894385, -0.018129093572497368, -0.014001214876770973, -0.06940329819917679, 0.00797344371676445, 0.0478559248149395, 0.004230884835124016, 0.01646573469042778, -0.029314804822206497, 0.00484892213717103, 0.021852577105164528, -0...
bbd6792bd30d3e12535ae2a1e20888ba0493a125
subsection
13
16
Sudden limit
The sudden limit corresponds to nonadiabatic conversion. The conversion efficiency is not strongly related to the structure of the energy levels. In this limit, we can derive the analytical expression of the conversion efficiency using the stationary phase approximation (SPA). Because of the large sweeping rate \alpha ...
{ "cite_spans": [] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
[ -0.035544510930776596, 0.05580335855484009, -0.037375129759311676, -0.017711235210299492, -0.018931647762656212, -0.00038090217276476324, -0.0026200730353593826, 0.038687076419591904, 0.07243148237466812, 0.029839083552360535, -0.034537672996520996, 0.03383593633770943, 0.0019469392718747258...
8e0e540715d9bcffb01f0c6bcc92b3b4205b0e4d
subsection
14
16
Sudden limit
The dominant contribution comes from the stationary point t_{0} of the phase around which we have4\Delta +8U(4\left|b\right|^{2}-1)=\bar{\alpha }(t-t_{0}),with\bar{\alpha }=4\alpha +32U\left[ \frac{d\left|b\right|^{2}}{dt}\right] _{t_{0}}.Since \left|b\right|^{2}=|b^{^{\prime }}|^{2}, then we have\left|b\right|^{2}=\le...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1830, "openalex_id": "", "raw": "Jie Liu, Bin Liu and Li-Bin Fu, arXiv:0712.4191, to appear in Phys. Rev. A.", "source_ref_id": "de6d68f85e1c431ca0112775c4c2a907a39d1f76", "start": 1711 } ] }
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
[ 0.007776530459523201, 0.019780930131673813, -0.05296282842755318, -0.018666725605726242, 0.005906805396080017, 0.0031155727338045835, 0.013805440627038479, 0.009218890219926834, 0.038279760628938675, -0.01059256587177515, -0.050734423100948334, 0.014591488055884838, -0.018101992085576057, ...
87ddec6b36ddb18b146c69ef9dba87d7b4118f01
subsection
15
16
Conclusion and discussion
In conclusion, we have both numerically and analytically investigated a generalized many-body model that includes the atom-atom, atom-molecule, and molecule-molecule background scattering interactions, emphasizing the dynamics of Feshbach molecular formation. Compared to the simple two-body molecular production picture...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1885, "openalex_id": "", "raw": "Jie Liu, Bin Liu and Li-Bin Fu, arXiv:0712.4191, to appear in Phys. Rev. A.", "source_ref_id": "de6d68f85e1c431ca0112775c4c2a907a39d1f76", "start": 1684 }, { "arxiv_id": "...
10.1103/PhysRevA.79.025602
0807.1691
The role of particle interactions in a many-body model of Feshbach molecular formation in bosonic systems
[ "Jing Li", "Di-Fa Ye", "Chao Ma", "Li-Bin Fu", "Jie Liu" ]
[ "cond-mat.mes-hall" ]
2,008
en
Physics
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5e40aa1aa183327d7dbc9fc4efbaafca70f33dc1
abstract
0
14
Abstract
In 0.9 fb$^{-1}$ of $p \bar p$ collisions, D0 has observed an excess of events with an isolated lepton, missing transve rse momentum, and two to four jets. This excess is consistent with single top quark production. We examine these data to study the Lorentz structure of the $Wtb$ coupling. The standard model predicts ...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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1e2f68f55c4fb0850b151c81afb5eb1b5befc4b5
subsection
1
14
Body
Search for anomalous {Wtb} couplings in single top quark production V.M. Abazov^{36} B. Abbott^{75} M. Abolins^{65} B.S. Acharya^{29} M. Adams^{51} T. Adams^{49} E. Aguilo^{6} M. Ahsan^{59} G.D. Alexeev^{36} G. Alkhazov^{40} A. Alton^{64,a} G. Alverson^{63} G.A. Alves^{2} M. Anastasoaie^{35} L.S. Ancu^{35} T. Andeen^{5...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
[ 0.0008490472100675106, 0.011792268604040146, -0.01893170177936554, -0.01894695684313774, -0.0036231097765266895, 0.03673452138900757, 0.01333304401487112, -0.03691758215427399, -0.0025247354060411453, 0.025964349508285522, -0.020228393375873566, 0.028542477637529373, -0.01574336551129818, ...
222c02bc1d36cbaf7df09ebc6e19b98cf1fdb853
subsection
2
14
Body
Chan^{55} A. Chandra^{48} E. Cheu^{45} F. Chevallier^{14} D.K. Cho^{62} S. Choi^{32} B. Choudhary^{28} L. Christofek^{77} T. Christoudias^{43} S. Cihangir^{50} D. Claes^{67} J. Clutter^{58} M. Cooke^{50} W.E. Cooper^{50} M. Corcoran^{80} F. Couderc^{18} M.-C. Cousinou^{15} S. Crépé-Renaudin^{14} V. Cuplov^{59} D. Cutts...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.046926096081733704, -0.009969506412744522, -0.04253249242901802, -0.05388262867927551, 0.0017925279680639505, -0.0015036258846521378, -0.003260875353589654, -0.009816951118409634, 0.014942818321287632, 0.009694906882941723, -0.031517982482910156, 0.03819991648197174, -0.04308169335126877,...
ce81023476331cf10bf9f8aa043afd5688da29d7
subsection
3
14
Body
Hadley^{61} P. Haefner^{25} S. Hagopian^{49} J. Haley^{68} I. Hall^{65} R.E. Hall^{47} L. Han^{7} K. Harder^{44} A. Harel^{71} J.M. Hauptman^{57} R. Hauser^{65} J. Hays^{43} T. Hebbeker^{21} D. Hedin^{52} J.G. Hegeman^{34} A.P. Heinson^{48} U. Heintz^{62} C. Hensel^{22,d} K. Herner^{72} G. Hesketh^{63} M.D. Hildreth^{5...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.04623641446232796, 0.011093687266111374, -0.028138596564531326, -0.03201451897621155, 0.015808885917067528, 0.024186374619603157, 0.01712120696902275, -0.030641160905361176, 0.01426767185330391, 0.006733273155987263, -0.03631770983338356, 0.03579888492822647, -0.03976636752486229, 0.025...
ab175772d7f0c9292112f80e222f822b9a4dadec
subsection
4
14
Body
Maciel^{2} D. Mackin^{80} R.J. Madaras^{46} P. Mättig^{26} C. Magass^{21} A. Magerkurth^{64} P.K. Mal^{82} H.B. Malbouisson^{3} S. Malik^{67} V.L. Malyshev^{36} H.S. Mao^{50} Y. Maravin^{59} B. Martin^{14} R. McCarthy^{72} A. Melnitchouk^{66} L. Mendoza^{8} P.G. Mercadante^{5} M. Merkin^{38} K.W. Merritt^{50} A. Meyer^...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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a2fa8f9b3810b20487f339b37c3afb888e2a6226
subsection
5
14
Body
Rizatdinova^{76} S. Robinson^{43} R.F. Rodrigues^{3} M. Rominsky^{75} C. Royon^{18} P. Rubinov^{50} R. Ruchti^{55} G. Safronov^{37} G. Sajot^{14} A. Sánchez-Hernández^{33} M.P. Sanders^{17} B. Sanghi^{50} G. Savage^{50} L. Sawyer^{60} T. Scanlon^{43} D. Schaile^{25} R.D. Schamberger^{72} Y. Scheglov^{40} H. Schellman^{...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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e6ece710f851f6ea878bc0b05b6e1878a5ec6845
subsection
6
14
Body
Wang^{50} J. Warchol^{55} G. Watts^{82} M. Wayne^{55} G. Weber^{24} M. Weber^{50} L. Welty-Rieger^{54} A. Wenger^{23,f} N. Wermes^{22} M. Wetstein^{61} A. White^{78} D. Wicke^{26} G.W. Wilson^{58} S.J. Wimpenny^{48} M. Wobisch^{60} D.R. Wood^{63} T.R. Wyatt^{44} Y. Xie^{77} S. Yacoob^{53} R. Yamada^{50} W.-C. Yang^{44}...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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7f1ea15f342d3df5673121aedb6129b3767baef0
subsection
7
14
Body
Physikalisches Institut A, RWTH Aachen University, Aachen, Germany ^{22}Physikalisches Institut, Universität Bonn, Bonn, Germany ^{23}Physikalisches Institut, Universität Freiburg, Freiburg, Germany ^{24}Institut für Physik, Universität Mainz, Mainz, Germany ^{25}Ludwig-Maximilians-Universität München, München, Germany...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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38394542c0393310c1fb9331964f51dc79598b83
subsection
8
14
Body
Petersburg, Russia ^{41}Lund University, Lund, Sweden, Royal Institute of Technology and Stockholm University, Stockholm, Sweden, and Uppsala University, Uppsala, Sweden ^{42}Lancaster University, Lancaster, United Kingdom ^{43}Imperial College, London, United Kingdom ^{44}University of Manchester, Manchester, United K...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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5d472f75efe317bb8d3bb9fd8b988d960b2b2b68
subsection
9
14
Body
The most general lowest dimension, CP-conserving Lagrangian admits right-handed vector and left- or right-handed tensor couplings as well. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings. These are the first direct constraints on a general Wtb interaction and...
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10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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c38eca1bbfe36cc219f3c2a2f293aa159295987b
subsection
10
14
Body
In this case the predicted cross section for single top quark production is 2.9\pm 0.3 pb . [Figure: Feynman diagrams for (a) s-channeland (b) t-channel single top quark production.]The presence of anomalous couplings can change angular distributions and event kinematics as demonstrated by the p_T spectrum of the charg...
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10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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57e8248605002d568064f820cb557cc2900774c5
subsection
11
14
Body
The W+jets background is normalized such that the number of events predicted by the simulation agrees with the number of events observed in each analysis channel (defined by lepton flavor and jet multiplicity) before b tagging is applied.After all cuts we select 1,398 b tagged lepton+jets events, which we expect to con...
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10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
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c2ceeb502f470271374c706392fd3296521dc150
subsection
12
14
Body
Figure REF shows representative output distributions for the data and the sum of SM signal and backgrounds for the electron channel with two jets and one b-tagged jet in each of the three anomalous coupling scenarios. [Figure: Boosted decision tree output distributions for data and sum of SM signal and backgrounds for ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1167, "openalex_id": "", "raw": "I. Bertram et al., FERMILAB-TM-2104 (2000).", "source_ref_id": "284fad42c68b82bf786e63c1f18809e14c87d8b2", "start": 1024 } ] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.06939839571714401, -0.010772925801575184, -0.04290859401226044, 0.014511405490338802, -0.005832791794091463, 0.03778153657913208, 0.01428251899778843, 0.043091703206300735, -0.027756307274103165, 0.03053346276283264, -0.05670282244682312, 0.03451608866453171, 0.00896472204476595, -0.003...
852934d57bf60d65f7284fa644e9299c92a19946
subsection
13
14
Body
These are the first direct constraints on a general Wtb interaction and the first direct limits on left- and right-handed tensor couplings. [Table: Measured values of the total cross section for single top production and one-dimensional limits on Wtb couplings in the three scenarios.]We thank the staffs at Fermilab and...
{ "cite_spans": [] }
10.1103/PhysRevLett.101.221801
0807.1692
Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
[ "D0 Collaboration", "V. M. Abazov" ]
[ "hep-ex" ]
2,008
en
Physics
[ -0.010267791338264942, 0.004721963778138161, -0.02843857929110527, -0.00018236582400277257, -0.02608904056251049, -0.002984601305797696, 0.015508485026657581, -0.010069454088807106, -0.0015542812179774046, 0.05034726858139038, -0.033229198306798935, -0.023693731054663658, 0.04000319540500641...
9ea9d7075f73d48b0e3bcb78823bca8bafdc772a
abstract
0
10
Abstract
Large volume cosmological simulations succeed in reproducing the large-scale structure of the Universe. However, they lack resolution and may not take into account all relevant physical processes to test if the detail properties of galaxies can be explained by the CDM paradigm. On the other hand, galaxy-scale simulatio...
{ "cite_spans": [] }
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.03390450403094292, 0.010375815443694592, -0.02523764595389366, -0.019836118444800377, -0.03402657061815262, -0.012580676935613155, -0.02352868765592575, -0.02053801156580448, 0.020873699337244034, 0.016784407198429108, 0.005000990815460682, 0.004257136024534702, -0.01863069273531437, 0....
480e6ac83993c8a41baca81fedfbea61483fb309
subsection
1
10
Introduction
The morphology of galaxies in the Local Universe is well constrained by observations, but is still largely unexplained. Indeed, large volume cosmological simulations fail to reproduce realistic galaxies. For instance, the disks formed are often too concentrated : it is the “angular momentum problem”, well known since t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 338, "openalex_id": "", "raw": "Navarro, J.F. & Benz, W., 1991, ApJ, 380, 320", "source_ref_id": "e7bcb2642581ca736a685b59b3b677481cc0b00d", "start": 204 }, { "arxiv_id": "", "doi": "", "end":...
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.03951209783554077, 0.012296042405068874, -0.033928532153367996, -0.030862150713801384, -0.026956707239151, 0.005812397226691246, -0.002484761644154787, -0.010099230334162712, 0.001318659051321447, 0.04677378013730049, -0.0014073323691263795, 0.014744571410119534, 0.005240310914814472, 0...
c47071af53709de7f6e945d7b3ef08ad3e14a0c3
subsection
2
10
Analysis of the cosmological simulation
Merger histories and accretion data are extracted from a dark matter only cosmological simulation performed with the AMR code RAMSES (). This simulation has an effective resolution of 512^3 and a comoving box length of 20 h^{-1} Mpc. The mass resolution is 6.9\times 10^6 M_{\odot }, so that a Milky Way type halo is mad...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 136, "openalex_id": "", "raw": "Teyssier, R., 2002, A&A, 385, 337", "source_ref_id": "24061e7112ec1157c3f8d894b9721bfa8c737197", "start": 0 }, { "arxiv_id": "", "doi": "", "end": 678, "o...
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ 0.007248235866427422, -0.027238108217716217, -0.0036431923508644104, 0.029572801664471626, -0.021195366978645325, -0.003013740060850978, 0.012199925258755684, -0.01519840583205223, -0.00790439173579216, 0.05127173289656639, -0.020554471760988235, 0.0026398838963359594, -0.004806724842637777,...
799dd93c1a8ef6efd8ab77c6a3246095a179fdea
subsection
3
10
The PM code
The history that has been extracted from the cosmological simulation is re-simulated with a particle-mesh code (). Gas dynamics is modeled with a sticky-particle scheme with \beta _r=0.8 and \beta _t=0.7, and star formation is computed according to a Kennicutt law with an exponent 1.5.The maximum spatial resolution is ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 114, "openalex_id": "", "raw": "Bournaud, F. & Combes, F. 2002, A&A, 392, 83", "source_ref_id": "a09d2d66b4057691e219414f7c73504395db0cd5", "start": 0 } ] }
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.0203237384557724, -0.01350338477641344, 0.01094765868037939, -0.01980496384203434, -0.028715671971440315, -0.059231795370578766, 0.03158418834209442, 0.01982022263109684, 0.002660624450072646, 0.033842381089925766, -0.03619212284684181, 0.03448322042822838, 0.01882844790816307, 0.015128...
056119ef9beadddaa7c0139763628afa98c3c1d6
subsection
4
10
Model galaxies
Each halo of the cosmological simulation (i.e. the main halo as well as all the interacting satellites) is replaced with a realistic galaxy, having a disk, a bulge and of course a dark matter halo. The total mass of the galaxy is divided in 20% of baryons and 80% of dark matter (the mass of dark matter being given by t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 495, "openalex_id": "", "raw": "Salucci, P. & Burkert, A., 2000, ApJL, 537, L9", "source_ref_id": "d879ca2ea51d533d1d163a49c1b08869fbe4cd98", "start": 349 } ] }
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.020338401198387146, -0.011405067518353462, -0.015806889161467552, -0.028791122138500214, -0.03310902789235115, -0.028882667422294617, 0.029477713629603386, -0.0006751494947820902, 0.0035340453032404184, 0.0010899659246206284, -0.007708910387009382, 0.032254599034786224, -0.025068262591958...
f8faddb3b4a0a40b8c7c92b2d5433842bc9649d1
subsection
5
10
Diffuse accretion
Each dark matter particle that is considered as diffuse accretion in the cosmological simulation is replaced with a small blob of particles, containing in mass 20% of gas and 80% of dark matter.The right side of figure REF shows an example of simulation where the main galaxy (edge-on) is surrounded by accreted gas (cle...
{ "cite_spans": [] }
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.0004155112255830318, -0.019452504813671112, -0.018689662218093872, -0.03921014815568924, -0.03811165317893028, -0.043329499661922455, 0.04686909541487694, 0.023037869483232498, 0.015523862093687057, 0.012464860454201698, -0.019940724596381187, 0.0060951183550059795, -0.009253289550542831,...
262f2e5c2749ae0a7307a1c4ae48e9f7bf1dfa8b
subsection
6
10
Two examples
We present here the first results concerning two simulations, that have been chosen to have a mass at z=0 of the order of magnitude of the mass of the Milky Way. They have very different histories.In the the first one, the mass growth of the galaxy is dominated by diffuse accretion (at a mean rate of \sim 5 M_{\odot } ...
{ "cite_spans": [] }
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.01288837380707264, 0.019809482619166374, -0.03974105790257454, -0.014681604690849781, -0.029821056872606277, 0.003367078024893999, -0.006799017544835806, 0.038062289357185364, 0.02644825540482998, 0.03946635127067566, 0.02254129946231842, -0.022373422980308533, -0.0235027763992548, -0.0...
1c2ac831ad9454faa43850cb2ddf358489a06d7b
subsection
7
10
The calm case
The evolution of the distribution of gas and stars is shown in figure REF . Gas is smoothly accreted around the galaxy and falls onto the disk. Minor mergers are not strong and frequent enough to destroy the stellar disk. They only slightly heat it, and a thin stellar disk is rebuilt thanks to gas from diffuse accretio...
{ "cite_spans": [] }
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.001045445678755641, 0.017551278695464134, -0.030081365257501602, -0.0024419170804321766, -0.00389562058262527, -0.012072226963937283, -0.02940983697772026, 0.012797171249985695, 0.02629639394581318, 0.021931467577815056, 0.00483423238620162, 0.006879338063299656, -0.06263516843318939, 0...
81a8bc345477f2a8680707d9c8db180a1181b81f
subsection
8
10
The violent case
In this case, the evolution of the morphology of the galaxy is totally different (see figure REF ). The disk is destroyed early by the first series of mergers. In fact, after the first of these mergers (which has a mass ratio of 8:1) the disk is already very perturbed, and the following mergers contribute to the transf...
{ "cite_spans": [] }
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.010374712757766247, 0.04903577268123627, 0.003602542681619525, -0.012541196309030056, -0.03603686764836311, -0.014959420077502728, -0.036921773105859756, 0.016004519537091255, 0.035457104444503784, 0.010450997389853, 0.009611866436898708, -0.00010596415086183697, -0.021420730277895927, ...
e734609450c3a5c569fbfa312e8d96f997005e1e
subsection
9
10
Conclusion
In order to study galaxy evolution in cosmological context, we have successfully developed a technique that allows us to perform high resolution simulations taking into account realistic merger and gas accretion histories.The first two simulations shown here do not allow us to draw any general conclusion on galaxy evol...
{ "cite_spans": [] }
10.1017/S1743921308027920
0807.1693
Numerical simulations of galaxy evolution in cosmological context
[ "Marie Martig", "Frederic Bournaud", "Romain Teyssier" ]
[ "astro-ph" ]
2,008
en
Physics
[ -0.04063839837908745, 0.016566554084420204, -0.03371278569102287, 0.008725661784410477, -0.040516361594200134, -0.010990978218615055, -0.020776838064193726, -0.006994258612394333, -0.003409415017813444, 0.02260739728808403, -0.004610719159245491, 0.00015373830683529377, -0.032034773379564285...
b665907bc6470b483335487aa8de844e923d5387
abstract
0
80
Abstract
We show that if K: P \to R is an autonomous Hamiltonian on a symplectic manifold (P,\Omega) which attains 0 as a Morse-Bott nondegenerate minimum along a symplectic submanifold M, and if c_1(TP)|_M vanishes in real cohomology, then the Hamiltonian flow of K has contractible periodic orbits with bounded period on all su...
{ "cite_spans": [] }
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
[ -0.046606145799160004, 0.012101726606488228, -0.0026057627983391285, 0.005699867382645607, -0.002113605383783579, -0.09699694067239761, 0.0038323404733091593, -0.038426414132118225, 0.00602797232568264, 0.04532424733042717, -0.0078096576035022736, -0.03390925005078316, 0.02215852029621601, ...
7468218397d3b40901fd0e0e32a231b2222e51b8
subsection
1
80
Introduction
Consider a symplectic manifold (P,\Omega ) containing a closed, connected symplectic submanifold M, with 2m=\dim M, 2n=\dim P, and r=n-m. In recent years, there has been significant interest in the following question:Question 1.1 If K\colon \,P\rightarrow [0,\infty ) is a proper smooth function with K^{-1}(\lbrace 0\rb...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 917, "openalex_id": "", "raw": "V. L. Ginzburg and B. Z. Gürel. Relative Hofer–Zehnder capacity and periodic orbits in twisted cotangent bundles. Duke Math. J. 123 (2004), no. 1, 1–47. MR2060021.", "source_ref_id": "0166aad2...
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
[ -0.036440007388591766, 0.008247831836342812, -0.04287957027554512, -0.021653421223163605, 0.0142524978145957, -0.07922802120447159, 0.02891700714826584, -0.02237062342464924, 0.009232078678905964, 0.020219014957547188, -0.013657372444868088, -0.012352673336863518, 0.008194423280656338, 0.0...
9153dda4fffdcf5dde54ad37db8d3e7f194bb1ca
subsection
2
80
Introduction
Of course, the case \sigma =0 just corresponds to the geodesic flow on M; accordingly the Hamiltonian flow of K on (T^*M,\Omega _{\sigma }) is sometimes called the \sigma -twisted geodesic flow. The search for periodic orbits of twisted geodesic flows was initiated by V. Arnol'd (for the case M=T^2) in , and has contin...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 355, "openalex_id": "", "raw": "V. I. Arnol'd. On some problems in symplectic topology. In Topology and geometry–Rohlin Seminar. Lect. Notes Math. 1346, Springer, Berlin, 1988, 1–5. MR0970068.", "source_ref_id": "def6c9309eb...
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
[ -0.04039555415511131, 0.01732981577515602, -0.015133078210055828, 0.0009181674686260521, 0.029427124187350273, -0.04652811214327812, -0.008626770228147507, -0.017772214487195015, 0.016551803797483444, 0.02547604963183403, 0.007005913648754358, -0.04860280826687813, -0.0010707186302170157, ...
c5f088167e9b2538c6b9e1816c8f56f64a358332
subsection
3
80
Introduction
An important ingredient in the proof of the corresponding theorem in is a result (Propositions 3.1 and 3.2 of ) which, in certain situations which include the case where c_1(TP)|_{\nu M} is torsion, allows one to use grading information in Floer homology to bound the period of a periodic orbit. As such, in order to obt...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 296, "openalex_id": "", "raw": "V. L. Ginzburg and B. Z. Gürel. Periodic orbits of twisted geodesic flows and the Weinstein-Moser theorem. arXiv:0705.1818, to appear in Comment. Math. Helv.", "source_ref_id": "9ea37cf5191a6d...
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
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0ce123e84641d151dcd08a8c17592501a2d3168a
subsection
4
80
Introduction
We should point out that since we define X_K by \iota _{X_K}\omega =dK instead of \iota _{X_K}\omega =-dK as is done in , our Hamiltonian vector fields have periodic orbits which are related to those in by time reversal, as a result of which the Salamon–Zehnder indices \Delta ([\gamma ,w],K) of these orbits have opposi...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 329, "openalex_id": "", "raw": "V. L. Ginzburg and B. Z. Gürel. Periodic orbits of twisted geodesic flows and the Weinstein-Moser theorem. arXiv:0705.1818, to appear in Comment. Math. Helv.", "source_ref_id": "9ea37cf5191a6d...
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
[ -0.019763391464948654, 0.012804235331714153, -0.0242196936160326, 0.006257135421037674, 0.021793145686388016, -0.05371979624032974, 0.0007444655639119446, 0.032537102699279785, 0.041785456240177155, 0.03171299397945404, -0.015184999443590641, -0.016070155426859856, 0.014147230423986912, -0...
80fea5d2fc3e853d1a0da0d577e30ada79418bef
subsection
5
80
Introduction
The Arzelà-Ascoli theorem applied to the orbits so obtained from a sequence \epsilon _k\searrow 0 then shows that X_K has a contractible-in-\nu M periodic orbit of period at most T_0 in K^{-1}(\lbrace \rho \rbrace ).Now Theorems REF and REF depend only on the behavior of K in a (sufficiently small) tubular neighborhood...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 786, "openalex_id": "", "raw": "D. McDuff and D. Salamon. Introduction to symplectic topology. Oxford Mathematical Monographs. Oxford University Press, Oxford, 1998. MR1698616.", "source_ref_id": "2378df4359598566bc14c83d5ef...
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
[ -0.022292567417025566, 0.01756245456635952, 0.0020160202402621508, 0.02999807521700859, 0.012016014195978642, -0.045958392322063446, -0.00823192298412323, 0.009605182334780693, 0.0013236688682809472, 0.02995229884982109, -0.01502192486077547, 0.024398230016231537, 0.01383176725357771, 0.00...
0fda5109f101e2dd0f778a2d14f68262f005a905
subsection
6
80
Introduction
(The main subtlety here is that the Hamiltonians can behave quite wildly very close to the zero section, so we need our constants to depend only on the behavior of the Hamiltonians away from the zero section.) This enables us to define Floer groups HF^{[a,b]}(H) in a fairly standard way. Similar constructions are carri...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 622, "openalex_id": "", "raw": "V. L. Ginzburg and B. Z. Gürel. Periodic orbits of twisted geodesic flows and the Weinstein-Moser theorem. arXiv:0705.1818, to appear in Comment. Math. Helv.", "source_ref_id": "9ea37cf5191a6d...
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
[ -0.02778063528239727, -0.0029424435924738646, -0.016232067719101906, 0.023509038612246513, 0.023768385872244835, -0.042319320142269135, -0.033562544733285904, 0.025293955579400063, 0.02033585123717785, 0.05437132343649864, -0.030618196353316307, 0.023417504504323006, 0.01905437372624874, 0...
5a885bb916ca4371aae888980a9272270a9e705c
subsection
7
80
Introduction
For a judiciously chosen action interval [a,b] (equal to [c(\rho ),d(\rho )] in the notation of Section 4), in grading 2r one has, for i=0,1, CF_{2r}^{[a,b]}(F_i)=\mathbb {Z}_2\oplus N_i, where the \mathbb {Z}_2 is generated by a “fiberwise-capped” (in the terminology of Section 3) periodic orbit x_i, while the (typica...
{ "cite_spans": [] }
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
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525f688affd2a0132d31d95e31183bb530172bbb
subsection
8
80
Filtered Floer homology in symplectic disc bundles
As our input we take:a closed connected symplectic manifold (M,\omega _0) of (real) dimension 2m; a Morse function h\colon \,M\rightarrow \mathbb {R} having just one local maximum (i.e., just one critical point of index 2m; Theorem 8.1 of shows how to construct such an h). In the situation of case (ii) of Theorem REF ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 275, "openalex_id": "", "raw": "J. Milnor. Lectures on the h-cobordism theorem. Notes by L. Siebenmann and J. Sondow. Princeton University Press, Princeton, NJ, 1965. MR0190942.", "source_ref_id": "c052e5331b1cbc6c678e5eac13...
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
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2e7bdc07b370c4f16ec1638fc7276ebd77c1951b
subsection
9
80
Filtered Floer homology in symplectic disc bundles
Thus provided that R^2\le \frac{1}{2}\Vert F_A\Vert _{\infty }^{-1}, \omega :=\pi ^{*}\omega _0+d\theta defines a symplectic form on E(R), which tames the almost complex structure \bar{J} on E obtained by lifting J_0 to T^{hor}E and using the complex vector bundle structure on T^{vt}E. Choose an R such that this is the...
{ "cite_spans": [] }
0807.1694
Floer homology in disc bundles and symplectically twisted geodesic flows
[ "Michael Usher" ]
[ "math.SG", "math.DG", "math.DS" ]
2,008
en
Mathematics
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