id large_stringlengths 9 16 | title large_stringlengths 1 382 | abstract large_stringlengths 3 6.09k | publish_date date32 | update_date date32 | categories large listlengths 1 13 | authors large_stringlengths 3 62.8k |
|---|---|---|---|---|---|---|
math/9201250 | Factor = quotient, uncountable Boolean algebras, number of endomorphism
and width | We prove that assuming suitable cardinal arithmetic, if B is a Boolean
algebra every homomorphic image of which is isomorphic to a factor, then B has
locally small density. We also prove that for an (infinite) Boolean algebra B,
the number of subalgebras is not smaller than the number of endomorphisms, and
other relate... | 1992-01-15 | 2008-02-03 | [
"math.LO",
"math.GN"
] | Saharon Shelah |
math/9201252 | Linear liftings for non complete probability space | We show that it is consistent with ZFC that L^infty (Y,B, nu) has no linear
lifting for many non-complete probability spaces (Y,B, nu), in particular for
Y=[0,1]^A, B= Borel subsets of Y, nu = usual Radon measure on B . | 1992-01-15 | 2009-10-22 | [
"math.LO",
"math.FA"
] | Max R. Burke, Saharon Shelah |
math/9201253 | The universality spectrum of stable unsuperstable theories | It is shown that if T is stable unsuperstable, and aleph_1< lambda
=cf(lambda)< 2^{aleph_0}, or 2^{aleph_0} < mu^+< lambda =cf(lambda)<
mu^{aleph_0} then T has no universal model in cardinality lambda, and if e.g.
aleph_omega < 2^{aleph_0} then T has no universal model in aleph_omega. These
results are generalized to k... | 1992-01-15 | 2016-09-06 | [
"math.LO"
] | Menachem Kojman, Saharon Shelah |
math/9201249 | Coding and reshaping when there are no sharps | Assuming 0^sharp does not exist, kappa is an uncountable cardinal and for all
cardinals lambda with kappa <= lambda < kappa^{+ omega}, 2^lambda = lambda^+,
we present a ``mini-coding'' between kappa and kappa^{+ omega}. This allows us
to prove that any subset of kappa^{+ omega} can be coded into a subset, W of
kappa^+ ... | 1992-01-15 | 2016-09-06 | [
"math.LO"
] | Saharon Shelah, Lee Stanley |
math/9201251 | Cardinal arithmetic for skeptics | We present a survey of some results of the pcf-theory and their applications
to cardinal arithmetic. We review basics notions (in section 1), briefly look
at history in section 2 (and some personal history in section 3). We present
main results on pcf in section 5 and describe applications to cardinal
arithmetic in sec... | 1992-01-15 | 2008-02-03 | [
"math.LO"
] | Saharon Shelah |
math/9201238 | Existence of endo-rigid Boolean algebras | In [Sh:89] we, answering a question of Monk, have explicated the notion of
``a Boolean algebra with no endomorphisms except the ones induced by
ultrafilters on it'' (see section 2 here) and proved the existence of one with
character density aleph_0, assuming first diamondsuit_{aleph_1} and then only
CH. The idea was th... | 1992-01-15 | 2008-02-03 | [
"math.LO",
"math.GN"
] | Saharon Shelah |
math/9211216 | A low-technology estimate in convex geometry | Let $K$ be an $n$-dimensional symmetric convex body with $n \ge 4$ and let
$K\dual$ be its polar body. We present an elementary proof of the fact that
$$(\Vol K)(\Vol K\dual)\ge \frac{b_n^2}{(\log_2 n)^n},$$ where $b_n$ is the
volume of the Euclidean ball of radius 1. The inequality is asymptotically
weaker than the es... | 1992-11-01 | 2008-02-03 | [
"math.MG",
"math.FA"
] | Greg Kuperberg (U Chicago) |
math/9210218 | A characterization of convex hyperbolic polyhedra and of convex
polyhedra inscribed in the sphere | We describe a characterization of convex polyhedra in $\h^3$ in terms of
their dihedral angles, developed by Rivin. We also describe some geometric and
combinatorial consequences of that theory. One of these consequences is a
combinatorial characterization of convex polyhedra in $\E^3$ all of whose
vertices lie on the ... | 1992-10-01 | 2016-09-06 | [
"math.MG"
] | Craig D. Hodgson, Igor Rivin, Warren D. Smith |
math/9210222 | Keller's cube-tiling conjecture is false in high dimensions | O. H. Keller conjectured in 1930 that in any tiling of $\Bbb R^n$ by unit
$n$-cubes there exist two of them having a complete facet in common. O. Perron
proved this conjecture for $n\le 6$. We show that for all $n\ge 10$ there
exists a tiling of $\Bbb R^n$ by unit $n$-cubes such that no two $n$-cubes have
a complete fa... | 1992-10-01 | 2016-09-06 | [
"math.MG",
"math.CO"
] | Jeffrey C. Lagarias, Peter W. Shor |
math/9210213 | Piercing convex sets | A family of sets has the $(p,q)$ property if among any $p$ members of the
family some $q$ have a nonempty intersection. It is shown that for every $p\ge
q\ge d+1$ there is a $c=c(p,q,d)<\infty$ such that for every family $\scr F$ of
compact, convex sets in $R^d$ that has the $(p,q)$ property there is a set of
at most $... | 1992-10-01 | 2016-09-06 | [
"math.MG"
] | Noga Alon, Daniel J. Kleitman |
math/9204233 | A quasi-polynomial bound for the diameter of graphs of polyhedra | The diameter of the graph of a $d$-dimensional polyhedron with $n$ facets is
at most $n^{\log d+2}$ | 1992-04-01 | 2008-02-03 | [
"math.MG",
"math.CO"
] | Gil Kalai, Daniel J. Kleitman |
math/9201269 | Perspectives on information-based complexity | The authors discuss information-based complexity theory, which is a model of
finite-precision computations with real numbers, and its applications to
numerical analysis. | 1992-01-01 | 2008-02-03 | [
"math.NA"
] | J. F. Traub, Henryk Wo\'zniakowski |
math/9201266 | Some basic information on information-based complexity theory | Numerical analysts might be expected to pay close attention to a branch of complexity theory called information-based complexity theory (IBCT), which produces an abundance of impressive results about the quest for approximate solutions to mathematical problems. Why then do most numerical analysts turn a cold shoulder t... | 1992-01-01 | 2025-10-20 | [
"math.NA",
"cs.NA"
] | Beresford N. Parlett |
math/9210214 | Additive functions on shifted primes | Best possible bounds are obtained for the concentration function of an
additive arithmetic function on sequences of shifted primes. | 1992-10-01 | 2008-02-03 | [
"math.NT"
] | P. D. T. A. Elliott |
math/9207210 | Galois theory on the line in nonzero characteristic | The author surveys Galois theory of function fields with non-zero
caracteristic and its relation to the structure of finite permutation groups
and matrix groups. | 1992-07-01 | 2008-02-03 | [
"math.NT",
"math.GR"
] | Shreeram S. Abhyankar |
math/9204234 | Algorithms in algebraic number theory | In this paper we discuss the basic problems of algorithmic algebraic number
theory. The emphasis is on aspects that are of interest from a purely
mathematical point of view, and practical issues are largely disregarded. We
describe what has been done and, more importantly, what remains to be done in
the area. We hope t... | 1992-04-01 | 2008-02-03 | [
"math.NT"
] | Hendrik W. Lenstra Jr. |
math/9204217 | On the Selberg class of Dirichlet series: small degrees | In the study of Dirichlet series with arithmetic significance there has
appeared (through the study of known examples) certain expectations, namely (i)
if a functional equation and Euler product exists, then it is likely that a
type of Riemann hypothesis will hold, (ii) that if in addition the function has
a simple pol... | 1992-04-01 | 2024-10-10 | [
"math.NT"
] | J. Brian Conrey, Amit Ghosh |
math/9210227 | Voiculescu theorem, Sobolev lemma, and extensions of smooth algebras | We present the analytic foundation of a unified B-D-F extension functor
$\operatorname{Ext}_\tau$ on the category of noncommutative smooth algebras,
for any Fr\'echet operator ideal $\Cal K_\tau$. Combining the techniques
devised by Arveson and Voiculescu, we generalize Voiculescu's theorem to smooth
algebras and Fr\'e... | 1992-10-01 | 2016-09-06 | [
"math.OA"
] | Xiaolu Wang |
math/9204228 | The Mackey-Gleason Problem | Let $A$ be a von Neumann algebra with no direct summand of Type $\roman I_2$,
and let $\scr P(A)$ be its lattice of projections. Let $X$ be a Banach space.
Let $m\:\scr P(A)\to X$ be a bounded function such that $m(p+q)=m(p)+m(q)$
whenever $p$ and $q$ are orthogonal projections. The main theorem states that
$m$ has a u... | 1992-04-01 | 2016-09-06 | [
"math.OA"
] | L. J. Bunce, J. D. Maitland Wright |
math/9212209 | A quantum-group-like structure on noncommutative 2-tori | In this paper we show that in the case of noncommutative two-tori one gets in
a natural way simple structures which have analogous formal properties as Hopf
algebra structures but with a deformed multiplication on the tensor product. | 1992-12-01 | 2016-09-06 | [
"math.QA"
] | Andreas Cap, Peter W. Michor, Hermann Schichl |
math/9208203 | Towards the Chern-Weil homomormism in non-commutative differential
geometry | In this short review article we sketch some developments which should
ultimately lead to the analogy of the Chern-Weil homomorphism for principal
bundles in the realm of non-commutative differential geometry. Principal
bundles there should have Hopf algebras as structure `cogroups'. Since the
usual machinery of Lie alg... | 1992-08-01 | 2016-09-06 | [
"math.QA"
] | Andreas Cap, Peter W. Michor |
math/9207209 | The Fr\"olicher-Nijenhuis bracket in non-commutative differential
geometry | We carry over to a quite general noncommutative setting some of the basic
tools of differential geometry, using from the very beginning the setting of
convenient vector spaces developed by Froelicher and Kriegl, which allows to
carry all of multilinear algebra into this kind of functional analysis with
suitably complet... | 1992-07-01 | 2016-09-06 | [
"math.QA",
"math.FA"
] | Andreas Cap, Andreas Kriegl, Peter W. Michor, Ji\v{r}i Van\v{z}ura |
math/9201257 | The multigraded Nijenhuis-Richardson Algebra, its universal property and
application | We define two $(n+1)$ graded Lie brackets on spaces of multilinear mappings.
The first one is able to recognize $n$-graded associative algebras and their
modules and gives immediately the correct differential for Hochschild
cohomology. The second one recognizes $n$-graded Lie algebra structures and
their modules and gi... | 1992-01-01 | 2009-09-25 | [
"math.QA"
] | Pierre Lecomte, Peter W. Michor, Hubert Schicketanz |
math/9204229 | Ramanujan duals and automorphic spectrum | We introduce the notion of the automorphic dual of a matrix algebraic group
defined over $Q$. This is the part of the unitary dual that corresponds to
arithmetic spectrum. Basic functorial properties of this set are derived and
used both to deduce arithmetic vanishing theorems of ``Ramanujan'' type as well
as to give a... | 1992-04-01 | 2016-09-06 | [
"math.RT",
"math.NT"
] | Marc Burger, Jian-Shu Li, Peter Sarnak |
math/9204227 | Nilpotent orbits, normality, and Hamiltonian group actions | Let $M$ be a $G$-covering of a nilpotent orbit in $\g$ where $G$ is a complex
semisimple Lie group and $\g=\text{Lie}(G)$. We prove that under Poisson
bracket the space $R[2]$ of homogeneous functions on $M$ of degree 2 is the
unique maximal semisimple Lie subalgebra of $R=R(M)$ containing $\g$. The
action of $\g'\sime... | 1992-04-01 | 2016-09-06 | [
"math.RT"
] | Ranee Brylinski, Bertram Kostant |
math/9204222 | All unitary representations admit moment mappings | This is a review of [Michor, Peter W.: The moment mapping for a unitary
representation, Ann. Global Anal. Geometry, 8, No 3(1990), 299--313] including
a careful description of calculus in infinite dimensions. For any unitary
representation of an arbitrary Lie group I construct a moment mapping from the
space of smooth ... | 1992-04-01 | 2016-09-06 | [
"math.RT"
] | Peter W. Michor |
math/9201256 | The moment mapping for a unitary representation | For any unitary representation of an arbitrary Lie group I construct a moment
mapping from the space of smooth vectors of the representation into the dual of
the Lie algebra. This moment mapping is equivariant and smooth. For the space
of analytic vectors the same construction is possible and leads to a real
analytic m... | 1992-01-01 | 2016-09-06 | [
"math.RT"
] | Peter W. Michor |
math/9204235 | Spectral Theory and Representations of Nilpotent Groups | We give an estimate of the number $N(\lambda)$ of eigenvalues $<\lambda$ for
the image under an irreducible representation of the ``sublaplacian'' on a
stratified nilpotent Lie algebra. We also give an estimate for the trace of the
heat-kernel associated with this operator. The estimates are formulated in term
of geome... | 1992-04-01 | 2016-09-06 | [
"math.SP",
"math.RT"
] | Pierre Levy-Bruhl, Abderemane Mohamed, Jean Nourrigat |
nucl-th/9212016 | Electromagnetic Dissociation of Nuclei in Heavy-Ion Collisions | Large discrepancies have been observed between measured Electromagnetic
Dissociation(ED) cross sections and the predictions of the semiclassical
Weiz\"acker-Williams-Fermi(WWF) method. In this paper, the validity of the
semiclassical approximation is examined. The total cross section for
electromagnetic excitation of a... | 1992-12-28 | 2016-09-08 | [
"nucl-th"
] | C.J. Benesh and J.L. Friar |
nucl-th/9212015 | Chaotic Behavior in Warm Deformed Nuclei Induced by Residual Two-Body
Interactions | Band mixing calculations in rapidly rotating well-deformed nuclei are
presented, investigating the properties of energy levels and rotational
transitions as a function of excitation energy. Substantial fragmentation of E2
transitions is found for $E_x \gsim$ 800 keV above yrast, which represents the
onset of rotational... | 1992-12-25 | 2009-10-22 | [
"nucl-th"
] | M.Matsuo, T.D{\o}ssing, B.Herskind, S.Frauendorf, E.Vigezzi and
R.A.Broglia |
nucl-th/9212014 | Dynamics of antibaryon-baryon annihilation in the Skyrme model | We examine the dynamics of a baryon number zero lump in the Skyrme picture,
as a model for annihilation in the $\bar{N}N$ system. We find that radiation
propagates at the causal limit as a localized pulse and that the linearized
theory gives a good approximation. Both of these results are contrary to
findings in the Si... | 1992-12-18 | 2009-10-22 | [
"nucl-th"
] | Bin Shao, Niels R. Walet, and R. D. Amado |
nucl-th/9212012 | High-energy pion-nucleus elastic scattering | We investigate theoretical approaches to pion--nucleus elastic scattering at
high energies (300 $\le T_\pi \le$ 1 GeV). A ``model--exact'' calculation of
the lowest--order microscopic optical model, carried out in momentum space and
including the full Fermi averaging integration, a realistic off--shell
pion--nucleon sc... | 1992-12-17 | 2009-10-22 | [
"nucl-th"
] | C.M. Chen, D.J. Ernst and M.B. Johnson |
nucl-th/9212013 | Microscopic approach to pion-nucleus dynamics | Elastic scattering of pions from finite nuclei is investigated utilizing a
contemporary, momentum--space first--order optical potential combined with
microscopic estimates of second--order corrections. The calculation of the
first--order potential includes:\ \ (1)~full Fermi--averaging integration
including both the de... | 1992-12-17 | 2009-10-22 | [
"nucl-th"
] | C.M. Chen, D.J. Ernst and M.B. Johnson |
nucl-th/9212010 | Chiral colour-dielectric model with perturbative quantum pions and
gluons | Pionic contributions to static nucleon properties are calculated in a chiral
extension of the colour-dielectric model. The pion field and residual gluon
field are treated perturbatively. It is shown that with a simple choice for the
energy of the scalar confining field and in the chiral limit, the system of
equations d... | 1992-12-17 | 2016-09-08 | [
"nucl-th"
] | L.R. Dodd and D.E. Driscoll |
nucl-th/9212011 | Colour Transparency in Hadronic Basis | The dynamics of nuclear transparency in hard nuclear reactions is studied by
an expansion of the correlator of the hard scattering operator on a hadronic
basis. Colour transparency appears as an effect of interference between the
amplitudes corresponding to the final state interaction of different
intermediate baryonic... | 1992-12-17 | 2007-05-23 | [
"nucl-th"
] | A. Bianconi, S. Boffi and D.E. Kharzeev |
nucl-th/9212009 | Cross Section Fluctuations and Chaoticity in Heavy-Ion Dynamics | Cross section fluctuations in nuclear scattering are briefly reviewed in
order to show the main important features. Then chaotic scattering is
introduced by means of a very simple model. It is shown that chaoticity
produces the same kind of irregular fluctuations observed in light heavy--ion
collisions. The transition ... | 1992-12-16 | 2007-05-23 | [
"nucl-th"
] | A. Rapisarda |
nucl-th/9212008 | Kaon-Nucleon Scattering Amplitudes and Z$^*$-Enhancements from Quark
Born Diagrams | We derive closed form kaon-nucleon scattering amplitudes using the ``quark
Born diagram" formalism, which describes the scattering as a single interaction
(here the OGE spin-spin term) followed by quark line rearrangement. The low
energy I=0 and I=1 S-wave KN phase shifts are in reasonably good agreement with
experimen... | 1992-12-15 | 2009-10-22 | [
"nucl-th",
"hep-ph"
] | T. Barnes and E.S. Swanson |
nucl-th/9212006 | Poisson and Porter-Thomas Fluctuations in off-Yrast Rotational
Transitions | Fluctuations associated with stretched E2 transitions from high spin levels
in nuclei around $^{168}$Yb are investigated by a cranked shell model extended
to include residual two-body interactions. It is found that the gamma-ray
energies behave like random variables and the energy spectra show the Poisson
fluctuation, ... | 1992-12-14 | 2009-10-22 | [
"nucl-th"
] | M.Matsuo, T.D{\o}ssing, B.Herskind and S. Frauendorf |
nucl-th/9212007 | Hyperfine Populations Prior to Muon Capture | It is shown that the 1S level hyperfine populations prior to muon capture
will be statistical when either target or beam are unpolarised independent of
the atomic level at which the hyperfine interaction becomes appreciable. This
assertion holds in the absence of magnetic transitions during the cascade and
is true beca... | 1992-12-14 | 2009-10-22 | [
"nucl-th"
] | J.G.Congleton |
nucl-th/9212005 | Microscopic Origin of Quantum Chaos in Rotational Damping | The rotational spectrum of $^{168}$Yb is calculated diagonalizing different
effective interactions within the basis of unperturbed rotational bands
provided by the cranked shell model. A transition between order and chaos
taking place in the energy region between 1 and 2 MeV above the yrast line is
observed, associated... | 1992-12-14 | 2009-01-23 | [
"nucl-th"
] | M. Matsuo, T. D{\o}ssing, E. Vigezzi, and R.A. Broglia |
nucl-th/9212004 | The Lamda-N - Sigma-N Interaction with Isobar Coupling and Six-Quark
Resonances | The long-range $\Lambda N-\Sigma N$ interaction is modeled by a configuration
space meson-exchange potential matrix coupling to channels with $\Delta$ and
$\Sigma(1385)$ isobars. An inner boundary condition, based on $R$-matrix
theory, replaces form factors for short-range effects and includes the effects
of free quark... | 1992-12-10 | 2009-10-22 | [
"nucl-th",
"hep-ph"
] | W.R. Greenberg and E.L. Lomon |
nucl-th/9212003 | Relativistic Nuclear Matter with Self-Consistent Correlation Energy | We study relativistic nuclear matter in the $\sigma - \omega$ model including
the ring-sum correlation energy. The model parameters are adjusted
self-consistently to give the canonical saturation density and binding energy
per nucleon with the ring energy included. Two models are considered,
mean-field-theory where we ... | 1992-12-09 | 2008-11-26 | [
"nucl-th"
] | J. A. McNeil, C. E. Price, and J. R. Shepard |
nucl-th/9212002 | Exact 1-Fermion Loop Contributions in 1+1 Dimensional Solitons | We find solutions to the 1+1 dimensional scalar-only linear sigma model. A
new method is used to compute 1-fermion loop contributions exactly and
agreement with published results employing other methods is excellent. A
renormalization scheme which differs from that commonly used in such
calculations but similar to that... | 1992-12-07 | 2009-10-22 | [
"nucl-th"
] | J. R. Shepard, C. E. Price and T. C. Ferr\'ee (University of Colorado
Nuclear Physics Lab) |
nucl-th/9212001 | The Nuclear Response in Delta-Isobar Region in the ($^3\!$He,t) Reaction | The excitation of a $\Delta$-isobar in a finite nucleus in charge--exchange
($^3\!$He,t) reaction is discussed in terms of a nuclear response function. The
medium effects modifying a $\Delta$- and a pion propagation were considered for
a finite size nucleus. The Glauber approach has been used for distortion of a
$^3\!$... | 1992-12-02 | 2009-10-22 | [
"nucl-th"
] | V.F.Dmitriev |
nucl-th/9211013 | Comparison of potential models with the pp scattering data below 350 MeV | We calculate the chi**2 of various NN potential models with respect to the pp
scattering data. We find that only the potential models which were explicitly
fitted to the pp data give a reasonable description of these data. Most models
give a pretty large chi**2 on the very low-energy pp data, due to incorrect 1S0
phase... | 1992-11-24 | 2009-10-22 | [
"nucl-th"
] | Vincent Stoks and J.J. de Swart |
nucl-th/9211012 | Relativistic Mean Field Calculations of $\Lambda $ and $\Sigma $
Hypernuclei | Single--particle spectra of $\Lambda $ and $\Sigma $ hypernuclei are
calculated within a relativistic mean--field theory. The hyperon couplings used
are compatible with the $\Lambda $ binding in saturated nuclear matter,
neutron-star masses and experimental data on $\Lambda $ levels in hypernuclei.
Special attention is... | 1992-11-23 | 2008-11-26 | [
"nucl-th"
] | N.K. Glendenning, D. Von-Eiff, M. Haft, H. Lenske and M.K. Weigel |
nucl-th/9211011 | Magnetic Screening in Thermal Yang-Mills Theories | We develop a semiclassical method to calculate the density of magnetic
monopoles in non-abelian gauge theories at finite temperature in the dilute gas
approximation. This quantity is related to the inverse magnetic screening
length for which we obtain $\mu_M = 0.255 g^2T$ in SU(2). | 1992-11-23 | 2008-11-26 | [
"nucl-th",
"hep-ph"
] | T.S. Biro and B. Mueller |
nucl-th/9211010 | Physics of the Quark-Gluon Plasma | Central nuclear collisions at energies far above 1 GeV/nucleon may provide
for conditions, where the transition from highly excited hadronic matter into
quark matter or quark-gluon plasma can be probed. Here I review our current
understanding of the physical properties of a quark-gluon plasma and review
ideas about the... | 1992-11-20 | 2009-10-22 | [
"nucl-th",
"hep-ph"
] | Berndt Mueller |
nucl-th/9211009 | Hot Nuclear Matter : A Variational Approach | We develop a nonperturbative technique in field theory to study properties of
infinite nuclear matter at zero temperature as well as at finite temperatures.
Here we dress the nuclear matter with off-mass shell pions. The techniques of
thermofield dynamics are used for finite temperature calculations. Equation of
state ... | 1992-11-17 | 2015-06-26 | [
"nucl-th"
] | H. Mishra, S.P. Misra, P.K. Panda, B.K. Parida |
nucl-th/9211008 | Test of Scalar Meson Structure in $\phi$ Radiative Decays | We show that $\phi$ radiative decays into scalar mesons [$f_0$(975),
$a_0$(980)$\equiv S$] can provide important clues on the internal structures of
these mesons. Radiative decay widths vary widely: $B.R.=10^{-4}-10^{-6}$
depending on the substructures ($q\bar q$, $qq\bar q\bar q$, $K\bar K$,
glueball). Hence, we could... | 1992-11-12 | 2007-05-23 | [
"nucl-th",
"hep-ph"
] | S. Kumano (U. Mainz (present address) and INS-U. of Tokyo) |
nucl-th/9211007 | On the pion-nucleon coupling constant | In view of persisting misunderstanding about the determination of the
pion-nucleon coupling constants in the Nijmegen multienergy partial-wave
analyses of pp, np, and pbar-p scattering data, we present additional
information which may clarify several points of discussion. We comment on
several recent papers addressing ... | 1992-11-11 | 2008-11-26 | [
"nucl-th"
] | Vincent Stoks, Rob Timmermans, and J.J. de Swart |
nucl-th/9211006 | $q^2$-Dependence of Meson Mixing in Few-Body Charge Symmetry Breaking:
$\pi^o-\eta$ Mixing to One Loop in Chiral Perturbation Theory | It is pointed out that the meson mixing matrix elements usually considered
responsible for the bulk of the observed few-body charge symmetry breaking are
naturally $q^2$-dependent in QCD. For $\pi^o-\eta$ mixing, using the usual
representation of the pseudoscalar fields, the leading $q^2$ dependence can be
explicitly c... | 1992-11-10 | 2009-10-22 | [
"nucl-th"
] | Kim Maltman |
nucl-th/9211004 | Atomic Parity Nonconservation: Electroweak Parameters and Nuclear
Structure | There have been suggestions to measure atomic parity nonconservation (PNC)
along an isotopic chain, by taking ratios of observables in order to cancel
complicated atomic structure effects. Precise atomic PNC measurements could
make a significant contribution to tests of the Standard Model at the level of
one loop radia... | 1992-11-05 | 2008-11-26 | [
"nucl-th"
] | S.J. Pollock, E. N. Fortson and L. Wilets |
nucl-th/9211005 | Self-consistent anisotropic oscillator with cranked angular and vortex
velocities | The Kelvin circulation is the kinematical Hermitian observable that measures
the true character of nuclear rotation. For the anisotropic oscillator, mean
field solutions with fixed angular momentum and Kelvin circulation are derived
in analytic form. The cranking Lagrange multipliers corresponding to the two
constraint... | 1992-11-05 | 2008-11-26 | [
"nucl-th"
] | G. Rosensteel |
nucl-th/9211003 | Meson Mass Spectrum from Relativistic Equations in Configuration Space | A method is described for solving relativistic quasi-potential equations in
configuration space. The Blankenbecler-Sugar-Logunov-Tavkhelidze and an
equal-time equation, both relativistic covariant two-body equations containing
the full Dirac structure of positive and negative energy states, are studied in
detail. These... | 1992-11-04 | 2007-05-23 | [
"nucl-th",
"hep-ph"
] | P.C. Tiemeijer and J.A. Tjon |
nucl-th/9211002 | Sum Rule Description of Color Transparency | The assumption that a small point-like configuration does not interact with
nucleons leads to a new set of sum rules that are interpreted as models of the
baryon-nucleon interaction. These models are rendered semi-realistic by
requiring consistency with data for cross section fluctuations in proton-proton
diffractive c... | 1992-11-03 | 2008-11-26 | [
"nucl-th"
] | L. Frankfurt, W. R. Greenberg, G. A. Miller, M. Strikman |
nucl-th/9211001 | Pionic effects in deep inelastic scattering off nuclei | The structure functions calculated in the Chiral bag model reproduce quite
well, after appropriate perturbative evolution to large energy scales, the
experimental data. We use these results to interpret the structure of the $EMC$
data as a quenching of the pion decay constant due to the in medium behavior of
the nucleo... | 1992-11-02 | 2015-06-26 | [
"nucl-th",
"hep-ph"
] | P. Gonzalez and V. Vento |
nucl-th/9210020 | Coalescence, Percolation and Nuclear Multifragmentation | We show that the coalescence model for fragment formation leads to an
approximate site percolation model. Features characteristic of a percolation
model also appear in microscopic models of disassembly. | 1992-10-30 | 2009-10-22 | [
"nucl-th"
] | S. Das Gupta, C. Gale and K. Haglin |
nucl-th/9210019 | Finite volume of baryons and the mass limit for neutron stars | We confirmed the following idea by numerical calculation: The extended
structure of baryons may make the nuclear equation of state stiffer at higher
density while keeping the compression modulus for normal nuclear matter around
its empirical value $K=240MeV$.The model built in this wayy fits all empirical
data for norm... | 1992-10-26 | 2009-10-22 | [
"nucl-th",
"astro-ph"
] | Qi-Ren Zhang, Bo-Qiang Ma and Walter Greiner |
nucl-th/9210018 | Electromagnetic Decays of Hyperons (II) | Excited negative parity hyperon masses are calculated in a chiral bag model
in which the pion and the kaon fields are treated as perturbations. We also
calculate the hadronic widths of $\lama$ and $\lamb$ as well as the coupling
constants of the lightest $I=0$ excited hyperon to the meson-baryon channels,
and discuss h... | 1992-10-23 | 2009-10-22 | [
"nucl-th"
] | Y. Umino and F. Myhrer |
nucl-th/9210017 | Quartets of superdeformed bands and supersymmetry breaking | We examine the prediction of supersymmetric quantum mechanics that bands with
identical gamma-ray energies occur in quartets. The experimental data suggest
that this scenario is actually realized in nature. In the $A=150$ mass region,
four known pairs of isospectral bands can be grouped in two quartets, while
there are... | 1992-10-22 | 2015-06-26 | [
"nucl-th"
] | R.D. Amado, R. Bijker, F. Cannata, J.P. Dedonder and N.R. Walet |
nucl-th/9210016 | Transverse response functions in the $\Delta$-resonance region | We calculate transverse response functions for quasi-elastic electron
scattering at high momentum transfers in a relativistic Hartree approximation
in configuration space. We treat the excitation of the $\Delta$ resonance using
its free mass and width. Good agreement with experiment is found in the dip
region. | 1992-10-22 | 2008-11-26 | [
"nucl-th"
] | E. Rost, C. E. Price and J. R. Shepard (Department of Physics,
University of Colorado, Boulder) |
nucl-th/9210015 | Skyrmions and the Nuclear Force | The derivation of the nucleon-nucleon force from the Skyrme model is
reexamined. Starting from previous results for the potential energy of
quasistatic solutions, we show that a calculation using the Born-Oppenheimer
approximation properly taking into account the mixing of nucleon resonances,
leads to substantial centr... | 1992-10-20 | 2008-11-26 | [
"nucl-th"
] | Niels R. Walet and R. D. Amado |
nucl-th/9210013 | Effects of Octupole Vibrations on Quasiparticle Modes of Excitation in
Superdeformed $^{193}$Hg | A particle-vibration coupling calculation based on the RPA and the cranked
shell model has been carried out for superdeformed rotational bands in
$^{193}$Hg. The result suggests that properties of single-particle motions in
superdeformed nuclei may be significantly affected by coupling effects with
low-frequency octupo... | 1992-10-20 | 2017-02-01 | [
"nucl-th"
] | Takashi Nakatsukasa, Shoujirou Mizutori, Kenichi Matsuyanagi |
nucl-th/9210014 | Monte Carlo methods for the nuclear shell model | We present novel Monte Carlo methods for treating the interacting shell model
that allow exact calculations much larger than those heretofore possible. The
two-body interaction is linearized by an auxiliary field; Monte Carlo
evaluation of the resulting functional integral gives ground-state or thermal
expectation valu... | 1992-10-20 | 2008-11-26 | [
"nucl-th"
] | C. W. Johnson, S. E. Koonin, G. H. Lang, and W. E. Ormand |
nucl-th/9210012 | Riemann's theorem for quantum tilted rotors | The angular momentum, angular velocity, Kelvin circulation, and vortex
velocity vectors of a quantum Riemann rotor are proven to be either (1) aligned
with a principal axis or (2) lie in a principal plane of the inertia ellipsoid.
In the second case, the ratios of the components of the Kelvin circulation to
the corresp... | 1992-10-19 | 2008-11-26 | [
"nucl-th"
] | G. Rosensteel and A.L. Goodman |
nucl-th/9210011 | Relativistic Corrections to the Triton Binding Energy | The influence of relativity on the triton binding energy is investigated. The
relativistic three-dimensional version of the Bethe-Salpeter equation proposed
by Blankenbecler and Sugar (BbS) is used. Relativistic (non-separable)
one-boson-exchange potentials (constructed in the BbS framework) are employed
for the two-nu... | 1992-10-13 | 2008-11-26 | [
"nucl-th"
] | F. Sammarruca, D. P. Xu, and R. Machleidt |
nucl-th/9210007 | Old Problems in Low-Energy $K N$ Physics and Perspectives Opening Up at
New Machines | We survey the open problems in low--energy $KN$ physics, in the perspective
of using the new machines presently planned, such as the $\phi$--factory
DA$\Phi$NE at I.N.F.N. Nat. Labs. in Frascati (as a source of {\sl tagged},
low--energy kaons) and the KAON Factory at TRIUMF (as a producer of intense,
intermediate--ener... | 1992-10-12 | 2016-08-14 | [
"nucl-th",
"hep-ph"
] | Paolo M. Gensini (Dip. di Fisica dell{\'} Universit\`a di Perugia, and
I.N.F.N., Sezione di Perugia, Italy) and Galileo Violini (Centro
Internacional de F\'isica, Santa Fe de Bogot\'a, Colombia, Dip. di Fisica
dell{\'} Universit\`a della Calabria, Rende (Cosenza), Italy, and I.N.F.N.,
Gruppo Collegato di Cosenz... |
nucl-th/9210006 | Anatomy of the Soft-Photon Approximation in Hadron-Hadron Bremsstrahlung | A modified Low procedure for constructing soft-photon amplitudes has been
used to derive two general soft-photon amplitudes, a two-s-two-t special
amplitude $M^{TsTts}_{\mu}$ and a two-u-two-t special amplitude
$M^{TuTts}_{\mu}$, where s, t and u are the Mandelstam variables.
$M^{TsTts}_{\mu}$ depends only on the elast... | 1992-10-12 | 2009-10-22 | [
"nucl-th"
] | M. K. Liou, Dahang Lin, and B. F. Gibson |
nucl-th/9210008 | Low-Energy $KN$ Interactions at a $\phi$-Factory | The paper is the written version of a talk presented at the "VIIth Winter
School of Hadronic Physics", held in Folgaria (Trento), Italy, February 10--15,
1992.
We intend to illustrate in this lecture the possibilities opening up at
machines planned for the nineties for low--energy kaon--nucleon interactions,
keeping ... | 1992-10-12 | 2007-05-23 | [
"nucl-th",
"hep-ph"
] | Paolo M. Gensini (Dip. di Fisica dell{\'} Universit\`a di Perugia,
Perugia, and I.N.F.N., Sezione di Perugia, Italy) |
nucl-th/9210009 | Low-Energy Kaon Interactions and Scattering on Nucleons and Light Nuclei | A chapter to be included in "The DA$\mit\Phi$NE Physics Handbook" by the
DA$\Phi$NE Theory Working Group, this paper covers the phenomenology of
low--energy $K N$ physics, with particular emphasis on the problems still to be
solved by a careful experimental investigation and on the theoretical tools to
analyse it. | 1992-10-12 | 2007-05-23 | [
"nucl-th",
"hep-ph"
] | Paolo M. Gensini (Dip. di Fisica dell{\'} Universit\`a di Perugia,
Perugia, and I.N.F.N., Sezione di Perugia, Italy) |
nucl-th/9210010 | Saturation in the Nuclear Matter Problem | Once density-dependent meson masses are introduced into the nuclear many-body
problem, conventional mechanisms for saturation no longer operate. We suggest
that a loop correction, essentially the introduction of the axial vector
coupling $g_A(\rho,k)$ as function of density $\rho$ and momentum $k$, can
bring about satu... | 1992-10-12 | 2007-05-23 | [
"nucl-th"
] | G. E. Brown and R. Machleidt |
nucl-th/9210005 | Resonances in $\Lambda d$ Scattering and the $\Sigma$-hypertriton | Using separable $NN$ and $\Lambda N$-$\Sigma N$ potentials in the Faddeev
equations, we have demonstrated that the predicted enhancement in the $\Lambda
d$ cross section near the $\Sigma d$ threshold is associated with resonance
poles in the scattering amplitude. The positions of these poles, on the second
Riemann shee... | 1992-10-08 | 2009-10-22 | [
"nucl-th"
] | I. R. Afnan and B. F. Gibson |
nucl-th/9210004 | Quadrupole Contribution to Two Neutron Removal in Heavy Ion Collisions | In this report, electric quadrupole corrections to the two neutron removal
cross section measured in heavy ion collisions are estimated for $^{197}$Au and
$^{59}$Co targets. The quadrupole process is assumed to proceed primarily
through excitation of the giant isovector quadrupole resonance, which then
decays by neutro... | 1992-10-04 | 2008-11-26 | [
"nucl-th"
] | C.J. Benesh |
nucl-th/9210003 | Modelling the Off-Shell Dependence of $\pi^{o}- \eta$ Mixing with Quark
Loops | It is shown that including form factors for the quark-pseudoscalar meson
couplings of the Georgi-Manohar chiral quark model allows one to obtain the
leading off-shell dependence of $\pi^{o}- \eta$ mixing (as predicted by chiral
perturbation theory) from the effect of quark loops on the meson propagators.
Implications f... | 1992-10-02 | 2008-11-26 | [
"nucl-th",
"hep-ph"
] | Kim Maltman and T. Goldman |
nucl-th/9210002 | Quark Delocalization, Color Screening, and Nuclear Intermediate Range
Attraction | We consider the effect of including quark delocalization and color screening,
in the nonrelativistic quark cluster model, on baryon-baryon potentials and
phase shifts. We find that the inclusion of these additional effects allows a
good qualitative description of both. | 1992-10-01 | 2008-11-26 | [
"nucl-th"
] | Fan Wang, Guang-han Wu, Li-jian Teng, and T. Goldman |
nucl-th/9210001 | An Interactive NeXTstep Interface to a Fortran Code for Solving Coupled
Differential Equations | This paper describes a user-friendly frontend to a Fortran program that
integrates coupled nonlinear ordinary differential equations. The user
interface is built using the NeXTstep Interface Builder, together with a
public-domain graphical palette for displaying intermediate and final results.
In running the code for a... | 1992-10-01 | 2009-10-22 | [
"nucl-th"
] | Richard R. Silbar (LANL) |
adap-org/9312001 | Soft Turbulence in the Atmospheric Boundary Layer | In this work we compare the spectral properties of the daily medium
temperature fluctuations with the experimental results of the Chicago Group, in
which the local temperature fluctuations were measured in a helium cell. The
results suggest that the dynamics of the daily temperature fluctuations is
determined by the of... | 1993-12-08 | 2019-08-15 | [
"adap-org",
"nlin.AO"
] | Imre M. J\'anosi (Department of Atomic Physics, E\"otv\"os University
Budapest) and G\'abor Vattay (Department of Solid State Physics, E\"otv\"os
University Budapest) |
adap-org/9311005 | Parametric ordering of complex systems | Cellular automata (CA) dynamics are ordered in terms of two global
parameters, computable {\sl a priori} from the description of rules. While one
of them (activity) has been used before, the second one is new; it estimates
the average sensitivity of rules to small configurational changes. For two
well-known families of... | 1993-12-01 | 2009-10-22 | [
"adap-org",
"chao-dyn",
"nlin.AO",
"nlin.CD"
] | P.-M. Binder (IIASA, Laxenburg, Austria and Wolfson College, Oxford,
UK) |
adap-org/9311004 | Scaling behaviour in daily air humidity fluctuations | We show that the daily average air humidity fluctuations exhibit non-trivial
$1/f^{\alpha}$ behaviour which different from the spectral properties of other
meteorological quantities. This feature and the fractal spatial strucure found
in clouds make it plausible to regard air humidity fluctuations as a
manifestation of... | 1993-11-29 | 2009-10-22 | [
"adap-org",
"cond-mat",
"nlin.AO"
] | Gabor Vattay (Niels Bohr Institute, Copenhagen, Denmark) Andrea Harnos
(University of Veterinary Science, Department of Biomathematics and Computer
Science, Budapest, Hungary) |
adap-org/9311003 | Chaos as a Source of Complexity and Diversity in Evolution | The relevance of chaos to evolution is discussed in the context of the origin
and maintenance of diversity and complexity. Evolution to the edge of chaos is
demonstrated in an imitation game. As an origin of diversity, dynamic
clustering of identical chaotic elements, globally coupled each to other, is
briefly reviewed... | 1993-11-25 | 2008-02-03 | [
"adap-org",
"nlin.AO",
"q-bio"
] | Kunihiko Kaneko (University of Tokyo, Komaba) |
adap-org/9311001 | Cell Division, Differentiation and Dynamic Clustering | A novel mechanism for cell differentiation is proposed, based on the dynamic
clustering in a globally coupled chaotic system. A simple model with metabolic
reaction, active transport of chemicals from media, and cell division is found
to show three successive stages with the growth of the number of cells;
coherent grow... | 1993-11-25 | 2009-10-22 | [
"adap-org",
"nlin.AO",
"q-bio"
] | Kunihiko Kaneko(University of Tokyo, Komaba), Tetsuya Yomo( Osaka
University) |
adap-org/9311002 | Imitation Games | Mutual imitation games among artificial birds are studied. By employing a
variety of mappings and game rules, the evolution to the edge between chaos and
windows is universally confirmed. Some other general features are observed,
including punctuated equilibria, and successive alternations of dominant
species with temp... | 1993-11-25 | 2008-02-03 | [
"adap-org",
"nlin.AO",
"q-bio"
] | Kunihiko Kaneko (University of Tokyo,Komaba) Junji Suzuki (University
of Tokyo,Komaba) |
adap-org/9309001 | On the Threshold of Chaos in Random Boolean Cellular Automata | A random boolean cellular automaton is a network of boolean gates where the
inputs, the boolean function, and the initial state of each gate are chosen
randomly. In this article, each gate has two inputs. Let $a$ (respectively $c$)
be the probability the the gate is assigned a constant function (respectively a
non-cana... | 1993-09-16 | 2008-02-03 | [
"adap-org",
"nlin.AO"
] | James F. Lynch (Clarkson University) |
adap-org/9307001 | Dynamics of Earthquake Faults | We present an overview of our ongoing studies of the rich dynamical behavior
of the uniform, deterministic Burridge--Knopoff model of an earthquake fault.
We discuss the behavior of the model in the context of current questions in
seismology. Some of the topics considered include: (1) basic properties of the
model, suc... | 1993-08-05 | 2009-10-22 | [
"adap-org",
"chao-dyn",
"nlin.AO",
"nlin.CD",
"nlin.PS",
"patt-sol"
] | J.M. Carlson (Dept. of Physics, UC Santa Barbara), J.S. Langer
(Institute for Theoretical Physics, UC Santa Barbara), and B.E. Shaw
(Lamont-Doherty Earth Observatory, Columbia University) |
adap-org/9306005 | Prediction and Adaptation in an Evolving Chaotic Environment | We describe the results of analytic calculations and computer simulations of
adaptive predictors (predictive agents) responding to an evolving chaotic
environment and to one another. Our simulations are designed to quantify
adaptation and to explore co-adaptation for a simple calculable model of a
complex adaptive syst... | 1993-06-28 | 2008-02-03 | [
"adap-org",
"chao-dyn",
"nlin.AO",
"nlin.CD"
] | Alfred H\"ubler and David Pines (Santa Fe Institute and Physics
Department, University of Illinois) |
adap-org/9306004 | Exact solutions for a mean-field Abelian sandpile | We introduce a model for a sandpile, with N sites, critical height N and each
site connected to every other site. It is thus a mean-field model in the
spin-glass sense. We find an exact solution for the steady state probability
distribution of avalanche sizes, and discuss its asymptotics for large N. | 1993-06-14 | 2009-10-22 | [
"adap-org",
"cond-mat",
"nlin.AO"
] | Steven A. Janowsky (Rutgers) and Claude A. Laberge (Rutgers) |
adap-org/9306002 | Swarms, Phase Transitions, and Collective Intelligence | A spacially extended model of the collective behavior of a large number of
locally acting organisms is proposed in which organisms move probabilistically
between local cells in space, but with weights dependent on local morphogenetic
substances, or morphogens. The morphogens are in turn are effected by the
passage of a... | 1993-06-11 | 2008-06-25 | [
"adap-org",
"nlin.AO",
"q-bio.PE"
] | Mark M. Millonas (Center for Nonlinear Studies and Theoretical
Division, LANL and Santa Fe Institute) |
adap-org/9306003 | Dynamics, Computation, and the "Edge of Chaos": A Re-Examination | In this paper we review previous work and present new work concerning the
relationship between dynamical systems theory and computation. In particular,
we review work by Langton \cite{Langton90} and Packard \cite{Packard88} on the
relationship between dynamical behavior and computational capability in
cellular automata... | 1993-06-11 | 2008-02-03 | [
"adap-org",
"nlin.AO"
] | M. Mitchell (SFI), J. P. Crutchfield (UC Berkeley), P. T. Hraber (SFI) |
adap-org/9306001 | A nonequilibrium statistical field theory of swarms and other spatially
extended complex systems | A class of models with applications to swarm behavior as well as many other
types of spatially extended complex biological and physical systems is studied.
Internal fluctuations can play an active role in the organization of the phase
structure of such systems. Consequently, it is not possible to fully understand
the b... | 1993-06-10 | 2008-02-03 | [
"adap-org",
"nlin.AO"
] | Mark M. Millonas (CNLS and Theoretical Division, LANL; and Santa Fe
Institute) |
adap-org/9305002 | Biased Random-Walk Learning: A Neurobiological Correlate to
Trial-and-Error | Neural network models offer a theoretical testbed for the study of learning
at the cellular level. The only experimentally verified learning rule, Hebb's
rule, is extremely limited in its ability to train networks to perform complex
tasks. An identified cellular mechanism responsible for Hebbian-type long-term
potentia... | 1993-06-02 | 2008-02-03 | [
"adap-org",
"nlin.AO",
"q-bio"
] | Russell W. Anderson (Los Alamos National Laboratory) |
adap-org/9305001 | A Criterion for Stability in Random Boolean Cellular Automata | Random boolean cellular automata are investigated, where each gate has two
randomly chosen inputs and is randomly assigned a boolean function of its
inputs. The effect of non-uniform distributions on the choice of the boolean
functions is considered. The main results are that if the gates are more likely
to be assigned... | 1993-05-11 | 2008-02-03 | [
"adap-org",
"nlin.AO"
] | James F. Lynch (Clarkson University) |
adap-org/9304001 | Antichaos in a Class of Random Boolean Cellular Automata | A variant of Kauffman's model of cellular metabolism is presented. It is a
randomly generated network of boolean gates, identical to Kauffman's except for
a small bias in favor of boolean gates that depend on at most one input. The
bias is asymptotic to 0 as the number of gates increases. Upper bounds on the
time until... | 1993-04-26 | 2009-10-22 | [
"adap-org",
"nlin.AO"
] | James F. Lynch (Department of Mathematics and Computer Science,
Clarkson University) |
adap-org/9303003 | Revisiting the Edge of Chaos: Evolving Cellular Automata to Perform
Computations | We present results from an experiment similar to one performed by Packard
(1988), in which a genetic algorithm is used to evolve cellular automata (CA)
to perform a particular computational task. Packard examined the frequency of
evolved CA rules as a function of Langton's lambda parameter (Langton, 1990),
and interpre... | 1993-03-31 | 2008-02-03 | [
"adap-org",
"nlin.AO"
] | Melanie Mitchell and Peter Hraber (Santa Fe Institute) and James P.
Crutchfield (University of California, Berkeley) |
adap-org/9303002 | Evolution to the Edge of Chaos in Imitation Game | Motivated by the evolution of complex bird songs, an abstract imitation game
is proposed to study the increase of dynamical complexity: Artificial "birds"
display a "song" time series to each other, and those that imitate the other's
song better win the game. With the introduction of population dynamics
according to th... | 1993-03-08 | 2008-06-25 | [
"adap-org",
"nlin.AO",
"q-bio.PE"
] | Kunihiko Kaneko and Junji Suzuki |
adap-org/9303001 | The length of a typical Huffman codeword | If p is the probability of a letter of a memoryless source, the length l of
the corresponding binary Huffman codeword can be very different from the value
-log p. We show that, nevertheless, for a typical letter, l is approximately
equal to -log p. More precisely, the probability that l differs from -log p by
more than... | 1993-03-05 | 2008-02-03 | [
"adap-org",
"nlin.AO"
] | R. Schack (University of New Mexico) |
alg-geom/9312012 | Enumeration of $n$-fold tangent hyperplanes to a surface | For each $1\leq n\leq6$ we present formulas for the number of $n-$nodal
curves in an $n-$dimensional linear system on a smooth, projective surface.
This yields in particular the numbers of rational curves in the system of
hyperplane sections of a generic $K3-$surface imbedded in \p{n} by a complete
system of curves of ... | 1993-12-21 | 2008-02-03 | [
"alg-geom",
"math.AG"
] | Israel Vainsencher |
alg-geom/9312011 | Components of the Stack of Torsion-Free Sheaves of Rank 2 on Ruled
Surfaces | Let S be a ruled surface without sections of negative self-intersection. We
classify the irreducible components of the moduli stack of torsion-free sheaves
of rank 2 sheaves on S. We also classify the irreducible components of the
Brill-Noether loci in Hilb^N(P1xP1) given by W_N^0(D)={[X] | h^1(I_X(D)) >= 1 }
for D an ... | 1993-12-20 | 2008-02-03 | [
"alg-geom",
"math.AG"
] | Charles H. Walter |
alg-geom/9312010 | On the Harder-Narasimhan Filtration for Coherent Sheaves on P2: I | Let E be a torsion-free sheaf on P2. We give an effective method which uses
the Hilbert function of E to construct a weak version of the Harder-Narasimhan
filtration of a torsion-free sheaf on P2 subject only to the condition that E
be sufficiently general among sheaves with that Hilbert function. This
algorithm uses o... | 1993-12-20 | 2008-02-03 | [
"alg-geom",
"math.AG"
] | Charles H. Walter |
alg-geom/9312009 | Rational curves on Calabi-Yau threefolds | This note is a survey of the enumerative geometry of rational curves on
Calabi-Yau threefolds, based on a talk given by the author at the May 1991
Workshop on Mirror Symmetry at MSRI. An earlier version appeared in "Essays on
Mirror Manifolds"; this version corrects typographical errors that appeared in
print, gives a ... | 1993-12-16 | 2008-02-03 | [
"alg-geom",
"hep-th",
"math.AG"
] | Sheldon Katz |
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