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b0e9150b9e7a04222034e1b795a5c7a3e3cadb9f
subsection
56
74
Relative equilibria in
In this section we will prove a few results about fixed points, as well as elliptic and hyperbolic relative equilibria in {\bf H}^2. We also show that parabolic relative equilibria do not exist. Since, by the Principal Axis theorem for the Lorentz group, every Lorentzian rotation (see Appendix) can be written, in some ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 708, "openalex_id": "", "raw": "M. Henle, Modern Geometries: Non-Euclidean, Projective, and Discrete, Prentice-Hall, Upper Saddle River, New Jersey, 2001.", "source_ref_id": "2aa59c0e8ec2353c0c99d786b2c316ccc0f3406c", ...
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ 0.004849085118621588, 0.03455020859837532, -0.0155430156737566, -0.007966081611812115, -0.015260692685842514, -0.03397030383348465, 0.04913943260908127, 0.01808392070233822, 0.014703677967190742, -0.0349775068461895, -0.028781667351722717, 0.006050864700227976, -0.0036320448853075504, 0.01...
679444fbc5032c1e59cc85b88348e85442e8d2d3
subsection
57
74
Relative equilibria in
Indeed, if all the bodies are at all times on one side of a plane containing the rotation axis, then the integrals of the angular momentum are violated because the vector representing the total angular momentum cannot be zero or parallel to the z axis.Let us now define the hyperbolic relative equilibria.Definition 4 A ...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ 0.018463725224137306, -0.00864438060671091, -0.029190996661782265, 0.02874847687780857, -0.024399584159255028, -0.007866157218813896, 0.02731410413980484, 0.0018749836599454284, -0.005443746689707041, -0.01294749602675438, -0.012680458836257458, -0.019989652559161186, 0.012772014364600182, ...
6833c14d4c776aa3be028e17801a4f9b665142ab
subsection
58
74
Fixed Points in
The simplest solutions of the equations of motion are the fixed points. They can be seen as trivial elliptic relative equilibria that correspond to \omega =0. In terms of the equations of motion, we can define them as follows.Definition 6 A solution of system (REF ) is called a fixed point if\overline{\nabla }_{{\bf q}...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ 0.014699706807732582, 0.017133129760622978, -0.02981134131550789, 0.008116496726870537, 0.009863373823463917, 0.004130716901272535, 0.0333813801407814, 0.021374456584453583, 0.012357823550701141, -0.020474320277571678, -0.030116472393274307, -0.03484601154923439, -0.012571414932608604, 0.0...
78576dfc61fd9e6d9f286aa2ab159bae0dd50b4e
subsection
59
74
Elliptic Relative Equilibria in
We now consider elliptic relative equilibria, and prove an analogue of Theorem REF .Theorem 10 Consider the n-body problem with equal masses in {\bf H}^2. Then, for any m>0 and z>1, there are a positive and a negative \omega that produce elliptic relative equilibria in which the bodies are at the vertices of an n-gon r...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.04100816324353218, 0.023372212424874306, -0.005755331367254257, -0.021343164145946503, -0.009412960149347782, -0.009611289016902447, 0.014897497370839119, 0.004256427753716707, -0.004634014330804348, -0.015423829667270184, -0.04592060297727585, 0.007193210534751415, -0.030512027442455292,...
3516ebdf29e979d3cb0075157d576efaff3477e6
subsection
60
74
Elliptic Relative Equilibria in
To prove the other implication, we substitute into equations (REF ) a solution of the form (REF ) with i=1,2,3,\ \rho :=\rho _1, \rho _2, \rho _3,\ z:=z_1=z_2=z_3= (\rho ^2+1)^{1/2}, and \alpha _1=0, \alpha _2=2\pi /3, \alpha _3=4\pi /3. The computations then lead to the system{\left\lbrace \begin{array}{ll} m_1+m_2=\z...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.01498144306242466, 0.020031196996569633, -0.03142746537923813, -0.018459822982549667, 0.003516519907861948, -0.005362502299249172, 0.025462349876761436, 0.006403727922588587, -0.019893892109394073, -0.025859007611870766, -0.042472850531339645, -0.0048209126107394695, -0.013463465496897697...
a39fe35b3100b2afab091ed26ee2b85f4c53a4c4
subsection
61
74
Elliptic Relative Equilibria in
The sign of \omega determines the sense of rotation.Remark 6 For every \omega ^2/m>0, there is exactly one z>1 that satisfies equation (REF ) (see Figure REF ). [Figure: The graph of the function f(z)={4z^2+1\over 4z^3(z^2-1)^{3/2}} forz>1.]
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.04731340706348419, 0.007585407700389624, -0.04297889024019241, -0.0015033454401418567, -0.0014050937024876475, -0.036599211394786835, 0.03153209760785103, -0.0001959070796146989, -0.004601610358804464, -0.03314990922808647, -0.005887466948479414, -0.006505593657493591, -0.0055402475409209...
8c22ac23c1773789b8550c5c4d6364f1224b8656
subsection
62
74
Hyperbolic Relative Equilibria in
We now prove some results concerning hyperbolic relative equilibria. We first show that, in the n-body problem, hyperbolic relative equilibria do not exist along any given fixed geodesic of {\bf H}^2. In other words, the bodies cannot chase each other along a geodesic and maintain the same initial distances for all tim...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ 0.002577235922217369, 0.012956762686371803, -0.040777940303087234, -0.011697713285684586, -0.02631031721830368, 0.026539236307144165, -0.008813345804810524, 0.0010644691064953804, 0.02218979224562645, -0.026661325246095657, -0.040747418999671936, -0.018328707665205002, -0.03400196507573128, ...
d5619da2c32f82378860ea14207a02d68c14710f
subsection
63
74
Hyperbolic Relative Equilibria in
But every possible choice implies the existence of at least one i and one j with i\ne j and \alpha _i=\alpha _j. For those i and j, \sinh (\alpha _i-\alpha _j)=0, so equation (REF ) is undefined, therefore equations (REF ) cannot have solutions of the form (REF ). Consequently hyperbolic relative equilibria do not exis...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.016476882621645927, -0.0013692594366148114, -0.05059013143181801, -0.007708281744271517, 0.0001941611699294299, 0.022518405690789223, 0.027141084894537926, 0.019940078258514404, -0.0037072983104735613, -0.0206571277230978, -0.052817560732364655, 0.0015313583426177502, -0.03594401106238365...
0ccc7e9282333506feea43db938af330dad24609
subsection
64
74
Hyperbolic Relative Equilibria in
Then the analogue of equation (REF ) is{m\over x^2|x|(x^2+1)^{1/2}}+{M\over 4x^2|x|(x^2+1)^{3/2}}=\omega ^2,and it is obvious that for any m,M>0 and x\ne 0, there are a positive and negative \omega satisfying the above equation.Remark 9 Theorem REF also works for two bodies of equal masses, m:=m_1=m_2, of coordinatesx_...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ 0.012801713310182095, 0.01954588107764721, -0.024428537115454674, -0.018905034288764, 0.012694905512034893, -0.01893555000424385, 0.040403977036476135, 0.01390794012695551, 0.005489173345267773, -0.03597906976938248, -0.03246966376900673, -0.03179829567670822, -0.022048242390155792, -0.000...
edd9c4ce7f0286a8c254ae41769bb17b1bfd06a5
subsection
65
74
Parabolic Relative Equilibria in
We now show that there are no parabolic relative equilibria. More precisely, we prove the following result.Theorem 15 The n-body problem in {\bf H}^2 has no parabolic relative equilibria.Let x_i,y_i, and z_i be as in the definition of parabolic relative equilibria (REF ). Then \dot{x}_i=-b_i+c_i, \dot{y}_i=a_i+(c_i-b_...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ 0.026758063584566116, 0.00647593941539526, -0.02346288599073887, -0.027825944125652313, -0.049336131662130356, 0.03200593963265419, 0.006495008710771799, 0.02924470230937004, 0.02825309708714485, -0.040365926921367645, -0.034721408039331436, -0.04128125309944153, -0.004115158226341009, 0.0...
bfc8dbf1795ebda4c2c353b9bd9ff885721ef27d
subsection
66
74
Saari's conjecture
In 1970, Don Saari conjectured that solutions of the classical n-body problem with constant moment of inertia are relative equilibria, , . The moment of inertia is defined in classical Newtonian celestial mechanics as {1\over 2}\sum _{i=1}^nm_i{\bf q}_i\cdot {\bf q}_i, a function that gives a crude measure of the bodie...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 138, "openalex_id": "", "raw": "D. Saari, On bounded solutions of the n-body problem, in Periodic Orbits, Stability and resonances, G.E.O., Giacaglia (Ed.), pp. 76-81, D. Riedel, Dordrecht, 1970.", "source_ref_id": "32cbc08f...
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.005244455300271511, -0.0008829755824990571, -0.012510409578680992, 0.0027156744617968798, 0.005709781777113676, 0.008520809933543205, 0.025249669328331947, 0.0009029998909682035, 0.029033305123448372, 0.006541266106069088, 0.002122574020177126, 0.02311374433338642, -0.02715674415230751, ...
e06b9488fdd0f533a6d94b76ab8dcf8ce757160b
subsection
67
74
Saari's conjecture
According to the above definition of \bf I, we can assume without loss of generality that the geodesic passes through the point (0,0,1) and rotates about the z-axis with angular velocity \omega (t)\ne 0. The angular momentum of each body is {\bf L}_i=m_i{\bf q}_i\otimes \dot{\bf q}_i, so its derivative with respect to ...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ 0.0028541579376906157, 0.027915801852941513, -0.03443304821848869, 0.004662808962166309, 0.03669195622205734, 0.022024331614375114, 0.01198898907750845, -0.004632283002138138, -0.01852913200855255, -0.007524597924202681, -0.0190022811293602, -0.019505955278873444, -0.02693897671997547, 0.0...
407a731cad61e93783a7e2f0baa46c207a375ba8
subsection
68
74
Saari's conjecture
Consequently, L_i^z=c_i, where c_i is a constant.Let us also remark that since the angular momentum and angular velocity vectors are parallel to the z axis, L_i^z={\bf I}_i\omega (t), where {\bf I}_i=m_i(x_i^2+y_i^2) is the moment of inertia of the body m_i about the z-axis. Since the total moment of inertia, {\bf I}, ...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.025839788839221, 0.016575315967202187, -0.033120106905698776, 0.02123044803738594, 0.01756739430129528, 0.006780464667826891, 0.008913430385291576, 0.006219559349119663, -0.00850896816700697, -0.021840956062078476, -0.037546299397945404, -0.016972146928310394, -0.0007569356821477413, 0....
aba30d3b4bf3cbf497f8bee8a5025eee44a8d09a
subsection
69
74
Saari's conjecture
Thus \dot{L}_i^x=0 in either case.From here the proof proceeds as before by replacing \bf I with \bf J and the z axis with the x axis, and noticing that L_i^x={\bf J}_i\omega (t), to show that every m_i has a constant x_i coordinate. In other words, each body is moving along a (in general non-geodesic) hyperbola given ...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.0195778701454401, 0.0034715242218226194, -0.04263489320874214, 0.004242126364260912, -0.01263482216745615, 0.012146519497036934, 0.0009255807963199914, -0.012550895102322102, 0.01213125977665186, -0.035157766193151474, -0.02688714489340782, -0.03997974842786789, -0.028306273743510246, 0...
f274e2810b518c2fa06b878ed55cc6c84df9b977
subsection
70
74
The Weierstrass model
Since the Weierstrass model of the hyperbolic (Bolyai-Lobachevsky) plane is little known, we will present here its basic properties. This model appeals for at least two reasons: (i) it allows an obvious comparison with the sphere, both from the geometric and analytic point of view; (ii) it emphasizes the differences be...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1813, "openalex_id": "", "raw": "F. Dillen and W. Kühnel, Ruled Weingarten surfaces in Minkowski 3-space, Manuscripta Math. 98 (1999), 307-320.", "source_ref_id": "846accc3536804c0aad079cc2d1761b933812508", "start": 17...
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
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3534fc3dae983334829bb672d3e9470651c1126a
subsection
71
74
The Weierstrass model
Then the Principal Axis Theorem states that every Lorentzian transformation has one of the forms:A=P\begin{bmatrix} \cos \theta & -\sin \theta & 0 \\ \sin \theta & \cos \theta & 0 \\ 0 & 0 & 1 \end{bmatrix} P^{-1},A=P\begin{bmatrix} 1 & 0 & 0 \\ 0 & \cosh s & \sinh s \\ 0 & \sinh s & \cosh s \end{bmatrix}P^{-1},orA=P\b...
{ "cite_spans": [] }
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ 0.010619571432471275, 0.020522017031908035, -0.013488076627254486, 0.03066859021782875, 0.007175076752901077, 0.013655914925038815, 0.01080266758799553, 0.0018738737562671304, -0.004935964476317167, 0.020979756489396095, -0.04430924728512764, -0.004886376205831766, 0.02267339639365673, 0.0...
bdc3f0dd843fc821771d570ddb0b190cf8c1a07c
subsection
72
74
The Weierstrass model
Other properties of the Weierstrass model can be found in and . The Lorentz group is treated in some detail in , but the Principal Axis Theorems for the Lorentz group contained in and fails to include parabolic rotations, and is therefore incomplete.
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 64, "openalex_id": "", "raw": "R. L. Faber, Foundations of Euclidean and Non-Euclidean Geometry, Marcel Dekker, New York, 1983.", "source_ref_id": "6bd2ddf7a8867906ecbd28ad7fcb13d2ab054994", "start": 0 }, { ...
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.01670784130692482, 0.06219284608960152, -0.017089299857616425, 0.01814212277531624, -0.012336337938904762, -0.019286494702100754, 0.04345564916729927, 0.008910848759114742, -0.028471993282437325, 0.01444198377430439, -0.013549373485147953, -0.039885204285383224, 0.0008592332014814019, 0...
6b90d37e393327b11b0be26f1ae7dc5f5242850a
subsection
73
74
History of the model
The first researcher who mentioned Karl Weierstrass in connection with the hyperboloidal model of the Bolyai-Lobachevsky plane was Wilhelm Killing. In a paper published in 1880, , he used what he called Weierstrass's coordinates to describe the “exterior hyperbolic plane” as an “ideal region” of the Bolyai-Lobachevsky ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 326, "openalex_id": "", "raw": "W. Killing, Die Rechnung in den nichteuklidischen Raumformen, J. Reine Angew. Math. 89 (1880), 265-287.", "source_ref_id": "2e20782a261cef118d812ba18e69949e8dfa35f7", "start": 148 },...
10.1007/s00332-011-9116-z; 10.1007/s00332-011-9117-y
0807.1747
The n-body problem in spaces of constant curvature
[ "Florin Diacu", "Ernesto Perez-Chavela", "Manuele Santoprete" ]
[ "math.DS", "math-ph", "math.MP" ]
2,008
en
Mathematics
[ -0.020701618865132332, -0.02431715652346611, -0.06230317801237106, 0.02321876399219036, -0.010938143357634544, -0.02451547607779503, 0.025018906220793724, -0.019313374534249306, 0.026895323768258095, 0.04478994384407997, -0.04750540852546692, 0.005122010596096516, -0.006700947880744934, 0....
074d09a3966304fb52d8259fa7217cf46b92df6e
abstract
0
28
Abstract
We investigate the influence of temperature and dissipation on the Landau-Zener transition probability in circuit QED. Dissipation is modelled by coupling the transmission line to a bath of harmonic oscillators. The reduced description for the density operator is treated within Bloch-Redfield theory. A phase-space repr...
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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49e0a3d69b95fc8300596a10aa7271f624b5b215
subsection
1
28
Introduction
The demonstration of coherent quantum dynamics in superconducting flux and charge qubits , , represents a major step towards a solid-state implementation of a quantum computer. Manipulation and readout of a qubit can be achieved by a controlled interaction with an electromagnetic circuit. For charge qubits implemented...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
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Physics
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5ad8a7f2d46251b5665e9d2d706ccf22da70fcf7
subsection
2
28
Landau-Zener dynamics in circuit QED
Circuit QED involves a Cooper pair box that couples capacitively to a transmission line which is described as a harmonic oscillator . The Cooper pair box is formed by a dc SQUID such that the effective Josephson energy = E_\mathrm {J}^0 \cos (\pi \Phi /\Phi _0) can be tuned via an external flux \Phi , where \Phi _0 den...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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fe6439a19c5ab72a649bf0b536a6409fe1a0d039
subsection
3
28
Landau-Zener dynamics in circuit QED
For the time-evolution from t=-\infty to t=\infty , the corresponding bit-flip probability can be evaluated exactly and reads = 1 - ^{-2 \pi g^2/ v} .Note that this generalisation of the Landau-Zener formula is also valid for large qubit-oscillator coupling g\gg \Omega for which more than two levels are relevant and, t...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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f01ab1da546836651c238fb5025c6a323bf0310e
subsection
4
28
Dissipative dynamics
Dissipative effects in an electromagnetic circuit are characterised by an impedance Z(\omega ) which, within a quantum mechanical description, can be modelled by coupling the circuit bi-linearly to its electromagnetic environment . This provides the system-bath Hamiltonian , , , = \widetilde{} + (a^{\dag } + a) \sum _{...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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2c12fbd794d35931ddaabe47fccaa86003255be1
subsection
5
28
Dissipative dynamics
The bath enters via the symmetric and the antisymmetric correlation functions(t)= \frac{1}{2}\langle [(t), ]_{+} \rangle _{\rm eq} &=& \int _{0}^{\infty } \omega \; J(\omega ) \coth \Big ( \frac{\hbar \omega }{2k_\mathrm {B}T}\Big ) \cos (\omega t) \\ (t) =\frac{1}{2}\langle [(t), ] \rangle _{\rm eq} &=& \int _{0}^{\i...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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bac2ea3d47ed23c1d5004c621d0d7b4a810e71d6
subsection
6
28
Dissipative dynamics
The corresponding solution of the Heisenberg equations for the dimensionless position operator (t) is derived in the and reads(t) = a^{\dag } ^{\Omega t} + a ^{-\Omega t} + \big [ (t) \sigma _{x} - (t) \sigma _{y} \big ] ,with the time-dependent functions (t) = \Omega [ \cos (\Omega t) - \cos (\omega _\mathrm {J}t) ] ...
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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ee1ecc05d700068bb0cd9e5569cc1d839825c9d0
subsection
7
28
Dissipative dynamics
The prefactor of the last term contains an effective force= \frac{}{2(\Omega ^{2} - \omega _\mathrm {J}^{2})} \Big [ \omega _\mathrm {J} \coth \Big (\frac{\hbar \omega _\mathrm {J}}{2k_\mathrm {B}T}\Big ) - \Omega \coth \Big ( \frac{\hbar \Omega }{2k_\mathrm {B}T} \Big ) \Big ]which acts on the oscillator and depends o...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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f89832b0477d691bf754016d707f3f0d5d3b4aba
subsection
8
28
Solving the master equation in phase space
The numerical solution of the quantum master equation QME-cqed requires an appropriate basis expansion. For the qubit, we choose the eigenstates of \sigma _z, i.e. |{\uparrow }\rangle and |{\downarrow }\rangle . The resulting matrix elements \rho _{ij} with i,j=, are operators in the Hilbert space of the harmonic oscil...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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8777afd67949c996966b5e681f1ff20521a80c25
subsection
9
28
Solving the master equation in phase space
The “ground state” \phi _{00} is the Wigner representation of the density operator of the harmonic oscillator at thermal equilibrium. Thus, if the oscillator stays close to equilibrium, the decomposition of the density operator can be performed with only a few basis states — irrespective of the temperature. The resulti...
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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2ff8407bcc2cde76f4940b5042e0b82bd8818f39
subsection
10
28
Landau-Zener tunnelling at finite temperature
Thermal effects can modify the Landau-Zener transition probability PLZ even in the absence of dissipation, i.e. for \gamma =0. Then the natural initial state is no longer the (initial) ground state |,0\rangle , but rather the canonical ensemble(t=-\infty ) = \otimes \frac{^{-/T}}{} ,where = \hbar a^{\dag } a is the cav...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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8146eba551a29418d21e29a959ca2c520b137b49
subsection
11
28
Landau-Zener tunnelling at finite temperature
For oscillator states with n>1, two final oscillator states are possible. Assuming that interference terms do not play any role, we find the transition probabilityP_{,n\rightarrow } = w(2g\sqrt{n}) w(2g\sqrt{n+1}) + [1-w(2g\sqrt{n})] [1-w(2g\sqrt{n-1})] ,which formally also holds for n=0,1. [Figure: Transition paths fr...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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57e6c684e4fdb69c664e91d880307aea41d55d67
subsection
12
28
Landau-Zener tunnelling at finite temperature
() for \gamma =0), while the solid linesrefer to the individual-crossing result Puuana. The dashedlines are a guide to the eye.]The temperature dependence of the spin-flip probability shown in figure REF possesses an intriguing non-monotonic behaviour: For low temperatures, T\lesssim 0.2\hbar \Omega , the probability i...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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subsection
13
28
Dissipative Landau-Zener transitions
In the previous section we have studied the consequences of thermal excitations of the initial state for the transition probability PLZ in the absence of an oscillator-bath coupling, i.e. for dissipation strength =0. We next address the question how dissipation and decoherence modify Landau-Zener tunnelling.
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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subsection
14
28
The zero-temperature limit
For a heat bath at zero temperature, the exact solution of the dissipative Landau-Zener problem has been derived in recent works , . Moreover, this limit generally is rather challenging for a master equation description of quantum dissipation , . Therefore the zero-temperature limit represents a natural test bed for ou...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
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Physics
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subsection
15
28
The zero-temperature limit
The sum \sum _{k^{\prime }} c_{k^{\prime }}^{2} can be expressed in terms of the spectral density Jeff, such it becomes\sum _{k^{\prime }} ^{2} = \frac{1}{g^2}\int \omega \, J_{{\rm eff}} (\omega ) = \frac{1}{\pi } \left[ \arctan \left( \frac{2\Omega ^{2} -^{2}}{\sqrt{4\Omega ^{2}-^{2}}} \right) + \frac{\pi }{2} \right...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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subsection
16
28
Thermal excitations and dissipative transitions
We next turn to the generic situation in which both thermal excitations of the initial state and dissipative transitions play a role, i.e. we consider the situation of finite temperatures and finite dissipation strength. The resulting spin-flip probabilities for three different sweep velocities are shown in figure REF ...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
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Physics
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60bb6dd2c1f4ca9a084907c4a1ecfc1cdc1feb45
subsection
17
28
Thermal excitations and dissipative transitions
Thus for large times, t\gg \Omega /v, the spectral density at the qubit splitting \hbar vt vanishes and, consequently, the qubit is effectively decoupled from the bath. [Figure: Population dynamics of the states {, 0} (a) and{,1} (b) during the Landau-Zener sweep.Dissipation strength and temperature are=10^{-2}\Omega a...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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ff0b552bcd35be142cfc4689b3942ca5fb4d624b
subsection
18
28
Conclusions
We have investigated the influence of finite temperature, decoherence, and dissipation on Landau-Zener transitions of a two-level system (qubit) that is coupled via a harmonic oscillator to a heat bath. In particular, we have focussed on a recent solid-state realization of this model, namely the so-called circuit QED f...
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10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
[ -0.029623085632920265, -0.014391844160854816, -0.06196276471018791, -0.007928486913442612, -0.004200800787657499, -0.04077943414449692, 0.03330117091536522, -0.017566291615366936, 0.000578039325773716, 0.04163409397006035, 0.04505272954702377, -0.004277109634131193, -0.015422013588249683, ...
ee7dc0ccae57be002c44a72278b9a98d2a58d3b8
subsection
19
28
Derivation of the quantum master equation
In this Appendix we outline the derivation of the master equation QME-cqed starting from the general Bloch-Redfield expression BR.
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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7cf1a32b2cca4f24b859a29d17b83c3d22be9e5d
subsection
20
28
Heisenberg coupling operator
The essential step is the solution of the Heisenberg equation of motion for the scaled position operator = a + a^{\dag } of the oscillator, which will rely on approximations. In doing so, we even address a slightly more general qubit Hamiltonian outside the charge degeneracy point, i.e. we also consider the charging en...
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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38ecc8c4e77907ac514145a0e592d793fd21086a
subsection
21
28
Heisenberg coupling operator
In the absence of the coupling, the time evolution of the qubit operators reads\bar{\sigma }_{x}(t) &=& \bar{\sigma }_{x} \cos (t) + \bar{\sigma }_{y} \sin (t) , \\ \bar{\sigma }_{z}(t) &=& \bar{\sigma }_{z} .Inserting this into the equation of motion Qddot for the oscillator coordinate, it becomes evident that the qub...
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
[ -0.027635948732495308, 0.032107140868902206, -0.026766125112771988, -0.009270479902625084, 0.026491444557905197, 0.019242921844124794, -0.003963797818869352, -0.03366366773843765, 0.042117733508348465, 0.007866554893553257, 0.015595769509673119, -0.02322579361498356, 0.03317534551024437, 0...
a96890b24055e47115499bbd2c6541f408ccb199
subsection
22
28
Ohmic spectral density
In circuit QED, the environment of the qubit and the transmission line is formed by electric circuits and, thus, can be characterised by an effective impedance. In most cases, this impedance is dominated by an Ohmic resistor, which corresponds to the Ohmic spectral density Jw of the bath. Then the time integration in t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1212, "openalex_id": "", "raw": "Weiss U 1998 Quantum Dissipative Systems, 2nd ed. (Singapore: World Scientific)", "source_ref_id": "b64841c17222c2413f9fdba663ee679d7ca7267c", "start": 1109 } ] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
[ -0.056683436036109924, 0.031180469319224358, -0.03507230430841446, -0.025487706065177917, 0.0015929816290736198, -0.05430255085229874, -0.002298853825777769, -0.0014651615638285875, 0.03162306919693947, 0.037025853991508484, 0.009515918791294098, 0.02144324965775013, 0.0005976065876893699, ...
467572c02880fc3cfa20c665194dcc1abe38ff5e
subsection
23
28
Basis expansion
In this appendix we outline the diagonalisation of the oscillator Liouvillian in Wigner representation, , whose eigenvectors are used as a basis set for the numerical treatment. Since the operator , apart from the cross-diffusion D_{xp}, is of the same form as the Fokker-Planck operator of the corresponding problem for...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 445, "openalex_id": "", "raw": "Titulaer U M 1978 Physica A 91 321", "source_ref_id": "78acd87efdd3f4501638f83a7c3cb67565745222", "start": 178 }, { "arxiv_id": "", "doi": "", "end": 445, ...
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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45a5b7827a310ae673b97f182ef010b423a3fc4b
subsection
24
28
Diagonalisation of the oscillator Liouvillian
By solving the characteristic functions of the partial differential equation \dot{\phi }=\phi , one finds the operators&=& \partial _{x} + \frac{}{\Omega } \partial _{p} \, , \\ &=& \frac{\Omega ^{2}}{^{2}-\Omega ^{2}} \Big ( \partial _{x} - \frac{}{\Omega } \partial _{p} + x - \frac{}{\Omega } p \Big ) ,which commute...
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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8083ec96ad2657bceb471c3e1422a954b71d9576
subsection
25
28
Diagonalisation of the oscillator Liouvillian
Repeating the calculation from above for ^\dag , we find the left ground state _{00}=1, so that we obtain the eigenfunctions_{nn^{\prime }} &=& \frac{1}{n! n^{\prime } !} ()^{n} ()^{n^{\prime }} _{00} \\ _{nn^{\prime }} &=& ()^{n} ()^{n^{\prime }} \; 1which fulfil the ortho-normalisation relation\int x p \, _{mm^{\prim...
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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733918ebbbbb457a9015cac1e2ff14796f0882f6
subsection
26
28
Expansion of the entire Liouvillian
Besides the already diagonalized oscillator Liouvillian, the total Liouvillian QME-cqed-ps for the qubit plus the oscillator contains also the operatorsx &=& - - + +^*, \qquad = \frac{\Omega ^{2}}{^{2} -\Omega ^{2}}, \\ \partial _{p} &=& -\frac{-}{2 \sqrt{1-^{2}/4 \Omega ^{2}}} .Then, the basis decomposition of the Wi...
{ "cite_spans": [] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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ac90fcff91441126b22639965b2ab5442c8555d6
subsection
27
28
Computation of expectation values
The expectation value of an operator can be performed directly in the basis of the eigenfunctions without back transformation to the operator representation of the density operator. For an observable= \otimes (x,p) ,for which S and refer to qubit and oscillator variables, respectively, the expectation value\langle \ran...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 705, "openalex_id": "", "raw": "Hillery M, O'Connell R F, Scully M O and Wigner E P 1984 Phys. Rep. 106 121", "source_ref_id": "732f7ad18964770a42cafad4ab318825f28970e5", "start": 182 } ] }
10.1088/1367-2630/10/11/115012
0807.1748
Landau-Zener tunnelling in dissipative circuit QED
[ "David Zueco", "Peter Hänggi", "Sigmund Kohler" ]
[ "quant-ph", "cond-mat.mes-hall" ]
2,008
en
Physics
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b17a41ccfe6e2e3219bd06b10a7bf70fdc4bab5d
abstract
0
17
Abstract
We derive the discrete anomaly conditions for the binary tetrahedral group T' as well as the binary dihedral groups Q_2n. The ambiguities of embedding these finite groups into SU(2) and SU(3) lead to various possible definitions of the discrete indices which enter the anomaly equations. We scrutinize the different choi...
{ "cite_spans": [] }
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
[ -0.025144463405013084, 0.013937784358859062, -0.014273450709879398, -0.014212420210242271, -0.006762914825230837, -0.026929598301649094, 0.04269066080451012, -0.021803058683872223, 0.022977890446782112, 0.0181259848177433, 0.0005492722848430276, -0.004947264678776264, -0.036648668348789215, ...
2a1e43532316edd6f85ed6657f9f9c4159ef1139
subsection
1
17
Introduction
The family structure of the Yukawa couplings which give rise to the masses and mixings of quarks and leptons remains unexplained within the Standard Model (SM). One of the most successful ideas to overcome this annoying shortcoming consists in extending the SM gauge group with a family-dependent U(1) symmetry. These Fr...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 517, "openalex_id": "", "raw": "C. D. Froggatt and H. B. Nielsen. Nucl. Phys., B147:277, 1979.", "source_ref_id": "86b900b0860c93808f351617c0fb8ef23b9d830f", "start": 312 }, { "arxiv_id": "", "doi":...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
[ -0.01486827339977026, -0.0254644937813282, -0.020429572090506554, -0.018232516944408417, 0.017912112176418304, -0.037227898836135864, 0.06005287542939186, 0.01550908200442791, -0.01650843769311905, 0.015448052436113358, -0.014288495294749737, 0.028104012832045555, -0.0279666967689991, 0.00...
c37c35bdd2403c2df3316a53a8ea095064d1a496
subsection
2
17
Introduction
It is one of the main intentions of this letter to shed some light on this ambiguity, proving that one particular assignment of discrete indices is sufficient to determine whether a specific model of flavor is discrete anomaly free or not. We illustrate the procedure by applying our results to some existing examples.
{ "cite_spans": [] }
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
[ -0.06544561684131622, -0.02615993283689022, -0.004857291933149099, 0.0058646174147725105, -0.013820197433233261, -0.06349201500415802, 0.04010986164212227, -0.0052235922776162624, 0.024404743686318398, -0.007070355117321014, 0.007921239361166954, -0.006475117523223162, -0.028724033385515213,...
21f84422b405f1f7a0a4a73a076bf3b39983ac58
subsection
3
17
The Binary Tetrahedral Group
The alternating group on four letters, \mathcal {A}_4, is the symmetry group of the tetrahedron, and as such a subgroup of SO(3). It has three one-dimensional and one three-dimensional irreps. Similar to SU(2) being the double cover of SO(3), the binary tetrahedral group \mathcal {T}^{\prime } is the double cover of \m...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 592, "openalex_id": "", "raw": "A. D. Thomas and G. V. Wood. Group Tables, Shiva Publishing Ltd., Kent 1980.", "source_ref_id": "3a39161e8d0624de24127012b482edf93b54f64b", "start": 437 }, { "arxiv_id": ""...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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1e4537531a86997dfe0ed5250198c3e70015aee9
subsection
4
17
The Binary Tetrahedral Group
The resulting Kronecker products are those of \mathcal {A}_4{\bf 1_k} \otimes {\bf 1_l} ~=~ {\bf 1_{k+l}} \ , \qquad {\bf 1_k} \otimes {\bf 3} ~=~ {\bf 3} \ , \qquad {\bf 3} \otimes {\bf 3} ~=~ {\bf 1_0} + {\bf 1_1}+{\bf 1_2} + 2 \cdot {\bf 3} \ ,plus the ones involving the doublets{\bf 2_k} \otimes {\bf 1_l} ~=~ {\bf ...
{ "cite_spans": [] }
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
[ 0.0014645254705101252, 0.042532261461019516, -0.02105255424976349, -0.008848174475133419, -0.004019817337393761, 0.00014588046178687364, 0.0356367863714695, 0.02854299172759056, -0.0016018247697502375, 0.03914554417133331, -0.005263138562440872, 0.04088466987013817, -0.025903794914484024, ...
33d7723e3b0ee8de46a589c56da8bbf9c2d87b9e
subsection
5
17
The Binary Tetrahedral Group
We obtain\begin{array}{llll} \widetilde{\ell }({\bf 1_0}) ~=~0\ , &\quad \widetilde{\ell }({\bf 1_1}) ~=~x\ , &\quad \widetilde{\ell }({\bf 1_2}) ~=~16-x\ , & \\[2mm] \widetilde{\ell }({\bf 2_0}) ~=~1\ , &\quad \widetilde{\ell }({\bf 2_1}) ~=~y\ , &\quad \widetilde{\ell }({\bf 2_2}) ~=~10-y\ , & \quad \widetilde{\ell }...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 713, "openalex_id": "", "raw": "C. Luhn and P. Ramond. JHEP, 07:085, 2008, arXiv:0805.1736.", "source_ref_id": "d2b3d2ef742e9d3417f00e8b06926c2384cf3b8b", "start": 588 }, { "arxiv_id": "", "doi": ""...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
[ -0.025940172374248505, 0.030731474980711937, 0.008461073972284794, -0.017563022673130035, 0.01502241101115942, -0.036835044622421265, 0.027862796559929848, 0.023620815947651863, -0.0037327143363654613, 0.017807165160775185, 0.03314238414168358, 0.008293225429952145, -0.036896079778671265, ...
cf5317ff1b61d38398c8bd51440f697b766cacfd
subsection
6
17
The Binary Tetrahedral Group
This is owed to the breaking pattern of SU(2) down to \mathcal {T}^{\prime }: the irreps {\bf 1_1} and {\bf 1_2} always come in pairs, as do the irreps {\bf 2_1} and {\bf 2_2}. Since mass terms need to be of the form {\bf 1_1} \otimes {\bf 1_2} or {\bf 2_1} \otimes {\bf 2_2}, it is impossible to make one constituent of...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 687, "openalex_id": "", "raw": "F. Feruglio, C. Hagedorn, Y. Lin, and L. Merlo. Nucl. Phys., B775:120, 2007, hep-ph/0702194.", "source_ref_id": "e7931bb6855beb271dc156a5bcdef35c2ee9849b", "start": 451 }, { ...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
[ -0.007165091577917337, 0.03543630242347717, -0.029179245233535767, -0.010095224715769291, 0.012369130738079548, -0.008576744236052036, 0.05011748895049095, 0.004303633235394955, 0.012697244994342327, 0.004772912710905075, -0.02167077735066414, 0.011651858687400818, -0.018969561904668808, 0...
5924f83bd53af21f16658953c7c11484fe5b0c34
subsection
7
17
The Binary Tetrahedral Group
With the hypercharges being opposite to each other, the particles of each pair add\begin{array}{ll} {\bf 1_1}-{\bf 1_2}: & \quad Y_{\bf 1_1} (2x-16) \ ,\\[2mm] {\bf 2_1}-{\bf 2_2}: & \quad Y_{\bf 2_1} (2y-10) \,=\, - Y_{\bf 2_1} (2x+8) \ , \end{array}to the discrete anomaly. Choosing either x=8 or x=20 their contributi...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 509, "openalex_id": "", "raw": "C. Luhn and P. Ramond. JHEP, 07:085, 2008, arXiv:0805.1736.", "source_ref_id": "d2b3d2ef742e9d3417f00e8b06926c2384cf3b8b", "start": 409 }, { "arxiv_id": "", "doi": ""...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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a1715ba2fe4f3bd3dce4ba0d11a78fb33283fac3
subsection
8
17
The Binary Tetrahedral Group
As these SU(2) irreps are the only ones that, under \mathcal {T}^{\prime }, decompose with an odd number of {\bf 2_0} irreps, the constraint from the Witten anomaly breaks down to the requirement of having an even number of {\bf 2_0} irreps in the complete theory, including the heavy degrees of freedom. From the Kronec...
{ "cite_spans": [] }
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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9b88e12d6a1a62fa5395a9d834e0854570d4e27c
subsection
9
17
The Binary Dihedral Groups
The dihedral group \mathcal {D}_n is the symmetry group of the planar n-polygon. Its 2n elements can be expressed as rotations in three-dimensional space, indicating that \mathcal {D}_n \subset SO(3). The dicyclic or binary dihedral group \mathcal {Q}_{2n} is the double cover of \mathcal {D}_n. It is defined by the pre...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 402, "openalex_id": "", "raw": "A. D. Thomas and G. V. Wood. Group Tables, Shiva Publishing Ltd., Kent 1980.", "source_ref_id": "3a39161e8d0624de24127012b482edf93b54f64b", "start": 296 }, { "arxiv_id": ""...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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52dca1750a4a3c6efe2125f89720c43e18aeb040
subsection
10
17
The Binary Dihedral Groups
This shows that, for odd n, \mathcal {D}_n has only two one-dimensional irreps.The Kronecker products for the irreps of \mathcal {Q}_{2n} are{\bf 1_1} \otimes {\bf 1_1} ~=~ {\bf 1_{0}} \ , \qquad {\bf 1_1} \otimes {\bf 1_2} ~=~ {\bf 1_3} \ , \qquad {\bf 1_1} \otimes {\bf 1_3} ~=~ {\bf 1_2} \ ,\\[3mm]{\bf 1_{2}} \otimes...
{ "cite_spans": [] }
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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2188335d0babc4bac134b6ae0333afc4653bf726
subsection
11
17
The Binary Dihedral Groups
Using Eqs. (REF ) and (REF ), one finds the following embedding .The constraints arising from the Witten anomaly require that the number of spinor-like irreps, i.e. the {\bf {2_{\kappa \alpha }}} with \kappa =\mathrm {odd}, is even if all degrees of freedom are counted. However, the Kronecker products show that these s...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 65, "openalex_id": "", "raw": "Paul H. Frampton and A. Rasin. Phys. Lett., B478:424, 2000, hep-ph/9910522.", "source_ref_id": "f7231372ac60c644381f571309c8fb9f544458b7", "start": 0 } ] }
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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7980175f0eb5f4540370796077e7fa3c6f432f2d
subsection
12
17
The Binary Dihedral Groups
Notice that the discrete indices for {\bf 2_{{\kappa \alpha }}}, {\bf 2_{{-\kappa \alpha }}}, and {\bf 2_{{(\kappa +2n)\alpha }}} are identical as required by the identities of Eq. (REF ). We emphasize that different embeddings of \mathcal {Q}_{2n} into SU(2) are distinguished by \alpha and have different discrete indi...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1417, "openalex_id": "", "raw": "C. Luhn and P. Ramond. JHEP, 07:085, 2008, arXiv:0805.1736.", "source_ref_id": "d2b3d2ef742e9d3417f00e8b06926c2384cf3b8b", "start": 1284 } ] }
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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7ce3a2431c77d6d6cf06aa75ba507e5d0d9c4c1a
subsection
13
17
The Binary Dihedral Groups
(REF ) gets replaced by\widetilde{\ell }({\bf 1_2}) ~=~ \widetilde{\ell }({\bf 1_3})~=~ \frac{n^2}{2} \,+\,\zeta \cdot 2n \qquad (n=\mathrm {odd}) \ ,with \zeta =0,1, while for even n we still have Eq. (REF ) with arbitrary y. With the discrete indices defined in Eqs. (REF )-(REF ), a model is discrete anomaly free if\...
{ "cite_spans": [] }
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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aa9d95b1418609e27bc313cb30b15e313067849a
subsection
14
17
The Binary Dihedral Groups
For odd n the term (c^{\prime }_2+c^{\prime }_3)\cdot n^2/2 has to be integer allowing us to define 2c_n=c^{\prime }_2+c^{\prime }_3 with c_n\in \mathbb {Z}. Thus we can simplify our equation to\!\!\!\left.\begin{array}{l} \sum _{\kappa =1}^{n} c_\kappa \kappa ^2 \\[3mm] c^{\prime }_1 \, \xi \,2n + \sum _{\kappa =1}^{n...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 2010, "openalex_id": "", "raw": "P. H. Frampton and O. C. W. Kong. Phys. Rev., D53:2293, 1996, hep-ph/9511343.", "source_ref_id": "710751b2f2381e4806958b117e58154dc2aa90f0", "start": 1895 }, { "arxiv_id":...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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c58cfb85dd012b914e189b5dd27b6823e8ac74a6
subsection
15
17
The Binary Dihedral Groups
For the remaining examples, the assignments of the quarks and leptons to the irreps of \mathcal {Q}_{2n} are listed in Table REF . Other fermions that are introduced in these models (like for example the Higgs doublets in supersymmetric models) give no net contribution to the \mathcal {Q}_{2n}-\mathcal {Q}_{2n}-U(1)_Y ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 722, "openalex_id": "", "raw": "D. Chang, W. Y. Keung, S. Lipovaca, and G. Senjanovic. Phys. Rev. Lett., 67:953, 1991.", "source_ref_id": "5c79428bd6a937c83dde1a20a755f37c83532914", "start": 329 }, { "arx...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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e42c85228fb6109d1dad24210cf6d429100c9d8a
subsection
16
17
Conclusion
In this letter we have derived the discrete indices for the irreps of the binary tetrahedral group \mathcal {T}^{\prime } as well as the binary dihedral groups \mathcal {Q}_{2n}. Despite the ambiguities of embedding the finite symmetries into continuous SU(2) and SU(3), it is possible to define discrete indices that en...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 988, "openalex_id": "", "raw": "T. Araki et al. Nucl. Phys., B805:124, 2008, arXiv:0805.0207.", "source_ref_id": "8973c382fdc21302b1cb0e41a7c1ea3b44a64875", "start": 886 }, { "arxiv_id": "", "doi": ...
10.1016/j.physletb.2008.11.025
0807.1749
Discrete Anomalies of Binary Groups
[ "Christoph Luhn" ]
[ "hep-ph", "hep-th" ]
2,008
en
Physics
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e6b995906dc5b05367310912ab787ea1344283be
abstract
0
19
Abstract
Inspired by biological dynamics, we consider a growth Markov process taking values on the space of rooted binary trees, similar to the Aldous-Shields model. Fix $n\ge 1$ and $\beta>0$. We start at time 0 with the tree composed of a root only. At any time, each node with no descendants, independently from the other node...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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1063f7a9aead5b720b87196b1dad0a9cc78e4ca4
subsection
1
19
Introduction
Growth and replicative senescence are very often connected. In cultured cells growth is not observed indefinitely, the division rate slows down and ultimately ceases . A cell clock mechanism based on the shortening of the replica with respect to the DNA template has been proposed in 1970s and was called marginotomy of ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 167, "openalex_id": "", "raw": "Hayflick L. The limited in vitro lifetime of human diploid cell strains. Exp. Cell Res. 1965; 37: 614-36.", "source_ref_id": "e78c2032590a2842b13f71160ff45c2d57446f5f", "start": 60 }...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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e143f4362038444e2f5108defc7cc6e5a42a212d
subsection
2
19
Introduction
We also estimated the mean telomere size of the cell population, which can be actually measured in cultured cells.Is worth of mention that the results obtained here do not depend on the particular division-counting mechanism. So, telomere or any other cell clock may be responsible for the replicative senescence/Gompert...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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7a5e446e4c5bfa78250f5d6b4aedb7891e8bf0cf
subsection
3
19
The stochastic model
We will assume that each cell in the initial cell population has its telomere with the same length L_0. For the sake of simplicity, we will also assume that a fixed amount of basis is lost by each telomere at each cell division, say \delta . This is an approximation of the dynamics of telomere length . Future research ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 303, "openalex_id": "", "raw": "Lin KW, Yan J. The telomere length dynamic and methods of its assessment. J Cell Mol Med. 2005;9:977-89.", "source_ref_id": "08f12fc257dab15f1fb8fe8f7059026885cf5d76", "start": 242 }...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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d4dc6bf255433e848475ba5a9c09abe841abfb85
subsection
4
19
The stochastic model
The expected value of X(k,t) isE(X(k,t))=\sum _{j=0} ^\infty j P(X(k,t)=j).Define\begin{array}{l} x_k(t)=E(X(k,t)),\qquad k=0,\cdots ,n. \end{array}Thenx_k(0)= {\left\lbrace \begin{array}{ll} 1,& k=0,\\ 0,& k=1,\cdots ,n \end{array}\right.}and\begin{array}{rcl} d\; x_0(t)/dt&=&-\lambda _0 x_0(t),\\ d\; x_k(t)/dt&=&2\la...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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538ba15000d7d4d793f5d4b7d29c7e8473099510
subsection
5
19
The stochastic model
The expected number of cells at time t is given by\sum _{i=0} ^n x_i(t)=[1,1,\dots ,1] {\mathbf {x}} (t)\;.
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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82e73f978e0e0f4dca2ba946115cf855525b2eb6
subsection
6
19
The dynamics of the stochastic model
In this section we present the analytical solution of the differential equations which governs the expected size of the cell population (REF ). We compute in particular the matrix \exp (t\mathbf {M}).In order to solve (REF ), first note that, since M is lower-triangular, the spectrum of M is -\lambda _0,-\lambda _1,\cd...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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ca64fb1183e219dda370935df4dc36fbe972d219
subsection
7
19
The dynamics of the stochastic model
Using again the fact that \mathbf {M} is lower-triangular and (REF ) we haveb_{i,k}=0, \qquad i<k.For i=k, since m_{k,k}=-\lambda _{k-1},b_{k,k}=(m_{k,k}+\lambda _{k-1})\;w_{k,k}=0.So, if k=n+1 then b=0 and the claim holds.For the case k=1,2,\cdots ,n and i>k,b_{i,k}=m_{i,i-1}\;w_{i-1,k}+(m_{i,i}+\lambda _{k-1})w_{i,k}...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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55bc5ce5a909818e473ff9439186aea038e954a0
subsection
8
19
The dynamics of the stochastic model
Then, for any \eta \in \mathbb {R},[\eta ^n,\eta ^{n-1},\dots , \eta , 1] \mathbf {A}(\gamma )= [(\eta +\gamma )^n,(\eta +\gamma )^{n-1},\dots , (\eta +\gamma ), 1]\,.Proof.Let (u_1,\cdots ,u_{n+1})= [\eta ^n,\eta ^{n-1},\dots , \eta , 1] \mathbf {A}(\gamma ). Direct calculation, together with (REF ) yields u_k&=&\s...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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4432fb42ddf75bd48384de087eea0cc0b0461505
subsection
9
19
The dynamics of the stochastic model
From this expressions and (REF ), we obtain a simple expression for the expected number of cells at time t: \sum _{i=0} ^n x_i(t) =[1,1,\dots ,1]\mathbf {A}(-2)\; \exp (t\mathbf {D}) \mathbf {A}(2)\begin{bmatrix} 1\\0\\ \vdots \\0 \end{bmatrix} To evaluate (REF ), use Lemma REF and (REF ) to obtain [1,1,\dots ,1]\m...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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30348fc52e9ea9ca26c89143baf91e2fc51fc250
subsection
10
19
The dynamics of the stochastic model
Defining the normalized Growth curve S_{norm}(\tau )=S(t_*+n\,\tau ) or, alternatively using the change of variable t= t_*+n \tau , in (REF ) we get 2^{-n} \sum _{i=0} ^{n} x_i(\tau )= \left(1-\frac{e^{-\beta \tau }\theta _n\ln 2}{n} \right)^n \approx \exp \left(-e^{-\beta \tau }\theta _n\ln 2 \right). Note that t...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 780, "openalex_id": "", "raw": "Zimmermann S,Voss M, Kaiser S, Kapp U,Waller CF, Martens UM. Lack of telomerase activity in human mesenchymal stem cells. Leukemia 2003.17, 1146–49.", "source_ref_id": "a58f0080c457481bc94de2f...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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76181c783c8ecbfbf7610d976baa7d1d197a7301
subsection
11
19
The dynamics of the stochastic model
To evaluate this quotient, define for \Psi :\mathbb {R}\times \mathbb {R}\rightarrow \mathbb {R} \Psi (u,t)= \sum _{k=0} ^n u^{n-k} X(k,t) Let \psi (u,t) be the expected value of \Psi (u,t) \psi (u,t)&=E(\, \Psi (u,t)\,) \\ &= \sum _{k=0} ^n u^{n-k} E(X(k,t)) As E(X(k,t))=x_k(t), using (REF ) we obtain \psi (u,t...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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06f855111d759b0c38cd3610edfcaeb8b04e0ac4
subsection
12
19
The dynamics of the stochastic model
Using the approximation E\left( \frac{ \sum _{k=0} ^n (n-k)\; X(k,t)}{\sum _{k=0} ^n X(k,t))} \right) \approx \frac{E\left( \sum _{k=0} ^n (n-k)\; X(k,t)\right)}{E\left( \sum _{k=0} ^n X(k,t)\right)} we obtain the estimation of the expected mean telomere size: E\left( \frac{ \sum _{k=0} ^n(L_{\min }+(n-k)\delta )\; ...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 753, "openalex_id": "", "raw": "Baxter MA, Wynn RF, Jowitt SN, Wraith JE, Fairbairn LJ, Bellantuono I. Study of telomere length reveals rapid aging of human marrow stromal cells following in vitro expansion. Stem Cells. 2004; 22:6...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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cbab57375c1d0ab4509b766e4460680bf238583f
subsection
13
19
The dynamics of the stochastic model
For a general review on this perspective, see
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 45, "openalex_id": "", "raw": "Kleideiter E, Piotrowska K, Klotz U. Screening of telomerase inhibitors. Methods Mol Biol. 2008;405:167-80.", "source_ref_id": "1b5d21fb0b9e360b6b185d3561ba90ba77e93b29", "start": 0 }...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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da01de975fb43ed6a8beb716015fe96f14020e07
subsection
14
19
How close are the stochastic and Gompertzian models?
First use (REF ) to determine the time t_* at which the (expected) population size is half of the final size:n\ln \left(1-\frac{e^{-\beta t_*/n}}{2}\right)=\ln 1/2 =-\ln 2Then-\ln \left(1-\frac{e^{-\beta t_*/n}}{2}\right)=(\ln 2)/n.As h<-\ln (1-h) for 0<h<1, we have\frac{e^{-\beta t_*/n}}{2}<(\ln 2)/n.Hence,\frac{e^{-\...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1327, "openalex_id": "", "raw": "Zimmermann S,Voss M, Kaiser S, Kapp U,Waller CF, Martens UM. Lack of telomerase activity in human mesenchymal stem cells. Leukemia 2003.17, 1146–49.", "source_ref_id": "a58f0080c457481bc94de2...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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c3505a263f1c70c9242163b7cb947054eff66502
subsection
15
19
Time evolution of the mean telomere length
In cultured cells, telomere length is not evaluated individually. Instead, what is actually measured is the mean telomere length of a bunch of cells  , .
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 153, "openalex_id": "", "raw": "Baxter MA, Wynn RF, Jowitt SN, Wraith JE, Fairbairn LJ, Bellantuono I. Study of telomere length reveals rapid aging of human marrow stromal cells following in vitro expansion. Stem Cells. 2004; 22:6...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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5bf1270fd0d0803277e495ddb2ba908549a373aa
subsection
16
19
Time evolution of the mean telomere length
Therefore, in order to verify the fitness of the stochastic model to real data, we must obtained the expected mean telomere length predicted by the model.In our model, the telomere length of a cell which has undergone k mitosis isL_{\min }+(n-k)\delta .Therefore, the mean telomere length at time t is\frac{ \sum _{k=0} ...
{ "cite_spans": [] }
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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19b120e496fce8290adc5df716fcabdc603c4631
subsection
17
19
Time evolution of the mean telomere length
So, it it important to remark that this random variable can be measured in experiments of cell culture tissue. Hence, we have an observable quantity which may agree or disagree with the model proposed here, confirming or invalidating respectively the model.Using the approximationE\left( \frac{ \sum _{k=0} ^n (n-k)\; X(...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 1004, "openalex_id": "", "raw": "Baxter MA, Wynn RF, Jowitt SN, Wraith JE, Fairbairn LJ, Bellantuono I. Study of telomere length reveals rapid aging of human marrow stromal cells following in vitro expansion. Stem Cells. 2004; 22:...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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46312def583f7c03e824b53eaf1c38a51e2c6601
subsection
18
19
Discussion
We studied an stochastic continuous-time growth model where the number of past divisions determine the probability of the next division. There is biological data supplying evidence that cell do count division, by means of telomere shortening. Moreover, mitosis-dependent telomere shortening is well documented, as well a...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 404, "openalex_id": "", "raw": "Greider CW. Telomere length regulation. Annu Rev Biochem. 1996;65:337-65.", "source_ref_id": "8fa5ab7aab8bdc4bf0dc131b79e842e3a159c658", "start": 243 }, { "arxiv_id": "", ...
0807.1750
A Markovian growth dynamics on rooted binary trees evolving according to the Gompertz curve
[ "C. Landim", "R. D. Portugal", "B. F. Svaiter" ]
[ "q-bio.CB", "math-ph", "math.MP", "q-bio.QM", "stat.OT" ]
2,008
en
Quantitative Biology
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efcfc92fb327b3a466727f641343582200c56402
abstract
0
18
Abstract
Agostic interactions are covalent intramolecular interactions between an electron deficient metal and a sigma-bond in close geometrical proximity to the metal atom. While the classic cases involve CH sigma-bonds close to early transition metals like titanium, many more agostic systems have been proposed which contain C...
{ "cite_spans": [] }
10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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68c4403ab99ee751ef66205e23290514b2a283ca
subsection
1
18
Introduction
Transition metal compounds which exhibit a close proximity of CH systems to the metal atom were discovered relatively early in the mid 1960's and early 1970's as the quality and availability of x-ray crystallography improved , , , , , . But the dispute as to whether or not the close approach was caused by an attractive...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 236, "openalex_id": "", "raw": "S. L. Placa, J. A. Ibers, Inorg. Chem. 4 (1965) 778–783.", "source_ref_id": "0303fddd19b589c4d0f146eaee7dd9aedb26a7e8", "start": 0 }, { "arxiv_id": "", "doi": "", ...
10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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afe1632f7c74ae59ae99d273b17d9380259af0d4
subsection
2
18
Agostic Interactions by type
As mentioned earlier, there are several types of agostic interactions. They are usually grouped according to the connectivity between the interacting atom (usually hydrogen) and the metal along covalent bonds (See fig. REF ). [Figure: \alpha , \beta and \gamma agostic interactions.]In this sense agostic interactions ar...
{ "cite_spans": [] }
10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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e73f93f9adf75b67ac4e1752ea40cc859daccc0a
subsection
3
18
Body
The first theoretical work on \alpha -agostic interactions was done more than 20 years ago by Goddard, Hoffmann and Jemmis . The importance of this work stems from the fact that this study radically altered the view on \alpha -agostic interactions. Until then, it was thought that the direct interaction of the occupied ...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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d2b0730c7341f74b00ef8d9085c9089338af74fd
subsection
4
18
Body
Some authors go as far as arguing for a replacement of the term agostic interaction with agostic geometry to emphasize the fact that the structural change in those compounds does not stem from a direct interaction of the metal atom and the carbon-hydrogen bond , .Not surprisingly many of the conclusions drawn for \alph...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 264, "openalex_id": "", "raw": "I. Vidal, S. Melchor, I. Alkorta, J. Elguero, M. R. Sundberg, J. A. Dobado, Organometallics 25 (2006) 5638–5647.", "source_ref_id": "ab886a024fa7372ec076024e941d05cd4eafc563", "start": 0...
10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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e3120f0e3e3b49099efbb20e8a6498fc4c807511
subsection
5
18
Agostic Interactions by method
Since many methods have been applied to the characterization of agostic interactions it is instructive to review the main computational tools that are commonly used. This section is divided into two subcategories.Firstly, the purely computational tools are reviewed. While density based methods like Bader's AIMrecently:...
{ "cite_spans": [] }
10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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a3bf14d4be55c683791e3a3bd6b893fde3702d20
subsection
6
18
AIM - Atoms in Molecules
The atoms in molecules method by Bader is an elegant way to rationalize chemical information through physical observation. Since many chemical concepts, starting with the term chemical bond, evolved when chemistry was still exclusively empirical it is often hard to translate them into physically meaningful concepts . A...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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721825d3de6fb43439054d8f0c3a7f145fce3a5c
subsection
7
18
AIM - Atoms in Molecules
However, the established values for hydrogen bonds lie in the range of 0.002–0.035 a.u. indicating that the interaction in these compounds is fundamentally different. Similarly, the Laplacian \nabla ^2\rho of the electron density at the bond critical point falls outside the established region for hydrogen bonds. Finall...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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c410c45a18796f21180adf7110f193380f551fe2
subsection
8
18
AIM - Atoms in Molecules
They state that while there is no bond critical point indicating the existence of agostic interactions in this system the molecular orbital picture leads to the conclusion that the \beta -agostic group acts as a two-electron ligand. This means that the first step of the polymerization is dominated by the CH\cdots Ti in...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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4ee90b17f036a2fd0884b823b982b9486803feab
subsection
9
18
AIM - Atoms in Molecules
Other functionals may fail to locate the agostic minimum entirely. McGrady and coworkers point out that only a functional that correctly reproduces a range of physical observables is fit for an analysis of agostic bonding situations.
{ "cite_spans": [] }
10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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91613c20dfe85984a7e5d507e03add3783d42418
subsection
10
18
NBO - Natural Bond Orbitals
One of the most widely used methods for the investigation of chemical bonding is Weinhold's natural bonding orbital approach . NBO generalizes the concept of natural orbitals, which are obtained by diagonalizing the first-order density matrix, by deriving natural atomic orbitals and natural bond orbitals from the one-e...
{ "cite_spans": [ { "arxiv_id": "", "doi": "", "end": 126, "openalex_id": "", "raw": "F. Weinhold, C. R. Landis, Valency and Bonding: A natural bond orbital donor-acceptor perspective, Cambridge University Press, Cambridge, UK, 2005.", "source_ref_id": "3bf087b07be3cdefd881763b...
10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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26fde70459d089cb072e615df560efe7d0d641d9
subsection
11
18
NBO - Natural Bond Orbitals
The \rm p_z orbital has a natural population of 0.318 e and \Delta E_{i\rightarrow j^*}^{(2)} for the CH-\sigma \rightarrow B \rm p_z donation yields 8.96 kcal/mol. A more traditional agostic interaction with a \gamma -BH\cdots Sn structure was recently reported . Here, the B-H \sigma bond orbitals interact strongly wi...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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6c5cbfa099d3bb26449290e6c5d44b4ba851533a
subsection
12
18
NBO - Natural Bond Orbitals
It is concluded that the low lying 6d and 5f orbitals form the foundation of the energetic preference of agostic geometries over the anagostic geometries.Calculations on agostic interactions involving silicon, both as SiC-agostic interactions as well as SiH-agostic interactions , have been performed recently.Clot, Moun...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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c457af456f617d3e673a8a6f4a65a3050282ecbd
subsection
13
18
NBO - Natural Bond Orbitals
Later Desiraju and Thakur expanded on the difference between agostic interactions and hydrogen bonds using NBO as a platform for their calculations .Although there is a clear preference for AIM theory for the treatment of agostic interactions among purely theoretically working groups and some experimental groups , , NB...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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97d093989c81ab150fc025092ab5fb745cf76c9c
subsection
14
18
other methods
Another commonly applied procedure to elucidate chemical bonding is the electron localization function or ELF. First introduced as a measure to compare the degree of electron localization in a given system compared to a uniform electron gas by Becke and Edgecombe and soon applied to chemical systems , . Soon after, Sil...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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bcc376c8ceada45c69a2216b7f5c5169006ac3e8
subsection
15
18
NMR properties
One of the tell-tale signs of an agostic interaction is a significantly lower NMR \rm ^1J_{CH} coupling constant. While the CH bond length is only marginally elongated, the coupling constant can decrease by more than 50% . Because of the computational effort that is usually involved in the calculation of NMR properties...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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be26e02508770c532decbefa14b4deb5a444ec8a
subsection
16
18
Vibrational Constants
Because agostic bonds are usually slightly elongated compared to their anagostic counterparts the associated CH stretching frequency is lower than that of a CH bond with no additional interactions present. This has been used in a series of combined experimental laser ablation and spectroscopic as well as computational ...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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8f91e014488156d80a540f051d8cb15f56dee0be
subsection
17
18
Conclusions
Given the wealth of publications in recent years it is obvious that agostic interactions still continue to draw attention and inspire further work. The very nature of the interaction is far from completely understood and many computational tools have been used to probe a wide variety of systems. It is the aim of this r...
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10.1016/j.ccr.2008.07.007
0807.1751
Characterization of agostic interactions in theory and computation
[ "Matthias Lein" ]
[ "physics.chem-ph" ]
2,008
en
Physics
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