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/9306215 | mu-complete Suslin trees on mu^+ | We prove that mu = mu^{< mu}, 2^mu = mu^+ and ``there is a non reflecting
stationary subset of mu^+ composed of ordinals of cofinality < mu'' imply that
there is a mu-complete Souslin tree on mu^+ . | 1993-06-15 | 2008-02-03 | [
"math.LO"
] | Menachem Kojman, Saharon Shelah |
math/9305202 | \v{C}ech-Stone remainders of spaces that look like $[0,\infty)$ | We show that many spaces that look like the half~line~$\halfline=[0,\infty)$
have, under~$\CH$, a \v{C}ech-Stone-remainder that is homeomorphic to~$\Hstar$.
We also show that $\CH$ is equivalent to the statement that all standard
subcontinua of~$\Hstar$ are homeomorphic. The proofs use Model-theoretic tools
like reduce... | 1993-05-18 | 2009-09-25 | [
"math.LO"
] | Alan Dow and Klaas Pieter Hart |
math/9305206 | Topological partition relations to the form omega^*-> (Y)^1_2 | Theorem: The topological partition relation omega^{*}-> (Y)^{1}_{2}
(a) fails for every space Y with |Y| >= 2^c ;
(b) holds for Y discrete if and only if |Y| <= c;
(c) holds for certain non-discrete P-spaces Y ;
(d) fails for Y= omega cup {p} with p in omega^{*} ;
(e) fails for Y infinite and countably compac... | 1993-05-15 | 2015-06-26 | [
"math.LO",
"math.GN"
] | W. Wistar Comfort, Akio Kato, Saharon Shelah |
math/9305205 | Every coseparable group may be free | We show that if 2^{aleph_0} Cohen reals are added to the universe, then for
every reduced non-free torsion-free abelian group A of cardinality less than
the continuum, there is a prime p so that Ext_p(A, Z) not= 0. In particular if
it is consistent that there is a supercompact cardinal, then it is consistent
(even with... | 1993-05-15 | 2016-09-06 | [
"math.LO",
"math.RA"
] | Alan H. Mekler, Saharon Shelah |
math/9305204 | The Ehrenfeucht-Fraisse-game of length omega_1 | Let (A) and (B) be two first order structures of the same vocabulary. We
shall consider the Ehrenfeucht-Fra{i}sse-game of length omega_1 of A and B
which we denote by G_{omega_1}(A,B). This game is like the ordinary
Ehrenfeucht-Fraisse-game of L_{omega omega} except that there are omega_1
moves. It is clear that G_{ome... | 1993-05-15 | 2009-09-25 | [
"math.LO"
] | Alan H. Mekler, Saharon Shelah, Jouko V\"a\"an\"anen |
math/9304205 | Sums of Darboux and continuous functions | It is shown that that for every Darboux function $F$ there is a non-constant
continuous function $f$ such that $F+f$ is still Darboux. It is shown to be
consistent --- the model used is iterated Sacks forcing --- that for every
Darboux function $F$ there is a nowhere constant continuous function $f$ such
that $F+f$ is ... | 1993-04-27 | 2008-02-03 | [
"math.LO"
] | Juris Stepr\=ans |
math/9304204 | Bounding and dominating number of families of functions on N | We pursue the study of families of functions on the natural numbers, with
emphasis here on the bounded families. The situation being more complicated
than the unbounded case, we attack the problem by classifying the families
according to their bounding and dominating numbers, the traditional scheme for
gaps. Many open ... | 1993-04-26 | 2008-02-03 | [
"math.LO"
] | Claude Laflamme |
math/9304207 | Viva la difference II. The Ax-Kochen isomorphism theorem | We show in section 1 that the Ax-Kochen isomorphism theorem requires the
continuum hypothesis. Most of the applications of this theorem are insensitive
to set theoretic considerations. (A probable exception is the work of Moloney.)
In section 2 we give an unrelated result on cuts in models of Peano arithmetic
which ans... | 1993-04-15 | 2016-09-06 | [
"math.LO",
"math.RA"
] | Saharon Shelah |
math/9304203 | The Consistency of $ZFC+CIFS$ | This paper is a technical continuation of ``Natural Axiom Schemata Extending
ZFC. Truth in the Universe?'' In that paper we argue that $CIFS$ is a natural
axiom schema for the universe of sets. In particular it is a natural closure
condition on $V$ and a natural generalization of $IFS(L).$ Here we shall prove
the consi... | 1993-04-15 | 2008-02-03 | [
"math.LO"
] | Garvin Melles |
math/9304202 | Natural Internal Forcing Schemata Extending ZFC | Let V be the universe of sets and V_{\alpha} the sets of rank \leq\alpha. We
develop some axiom schemata for set theory based on the following three
assumptions:
1. V \models ZFC
2. V is large with respect to the class of ordinals
3. V is large with respect to each of the V_{\alpha} | 1993-04-12 | 2016-09-06 | [
"math.LO"
] | Garvin Melles |
math/9304201 | The automorphism group of a saturated model has a large dense free
subgroup | We prove that for a stable theory $T,$ if $M$ is a saturated model of $T$ of
cardinality $\lambda$ where $\lambda > \big|T\big|,$ then $Aut(M)$ has a dense
free subgroup on $2^{\lambda}$ generators. This affirms a conjecture of Hodges. | 1993-04-12 | 2008-02-03 | [
"math.LO"
] | Garvin Melles and Saharon Shelah |
math/9304208 | Borel actions of Polish groups | We show that a {\it Borel} action of a Polish group on a standard Borel space
is Borel isomorphic to a {\it continuous} action of the group on a Polish
space, and we apply this result to three aspects of the theory of Borel actions
of Polish groups: universal actions, invariant probability measures, and the
Topological... | 1993-04-01 | 2016-09-06 | [
"math.LO",
"math.FA"
] | Howard Becker, Alexander S. Kechris |
math/9303208 | How special are Cohen and random forcings i.e. Boolean algebras of the
family of subsets of reals modulo meagre or null | The feeling that those two forcing notions-Cohen and Random-(equivalently the
corresponding Boolean algebras Borel(R)/(meager sets), Borel(R)/(null sets))
are special, was probably old and widespread. A reasonable interpretation is to
show them unique, or ``minimal'' or at least characteristic in a family of
``nice for... | 1993-03-15 | 2016-09-06 | [
"math.LO",
"math.FA"
] | Saharon Shelah |
math/9303207 | On closed P-sets with ccc in the space omega^* | It is proved that -- consistently -- there can be no ccc closed P-sets in the
remainder space omega^* . | 1993-03-15 | 2016-09-06 | [
"math.LO",
"math.GN"
] | Ryszard Frankiewicz, Saharon Shelah, Pawel Zbierski |
math/9302203 | Combinatorics on Ideals and Axiom A | Throughout this abstract let U be a fixed p-point ultrafilter and let I be
the dual ideal. Grigorieff forcing is P(U)={p:omega to 2|dom(p) is an element
of I} ordered by reverse inclusion. It is well known that Grigorieff forcing is
proper. The main result of this paper is the following:
THEOREM: Gregorieff forcing d... | 1993-02-26 | 2016-09-06 | [
"math.LO"
] | James Sharp |
math/9302202 | Full Reflection at a Measurable Cardinal | A stationary subset $S$ of a regular uncountable cardinal $\kappa$ {\it
reflects fully} at regular cardinals if for every stationary set $T \subseteq
\kappa$ of higher order consisting of regular cardinals there exists an $\alpha
\in T$ such that $S \cap \alpha$ is a stationary subset of $\alpha$. {\it Full
Reflection}... | 1993-02-25 | 2008-02-03 | [
"math.LO"
] | Thomas Jech and Ji\v{r}\'i Witzany |
math/9302201 | Provable Pi-1-2 Singletons | In this note I show that a pi-1-2 singleton R of L-degree strictly between 0
and 0# can be obtained so as to be the unique solution to a pi-1-2 formula
which provably has at most one solution, in the theory ZFC+(*) where (*) has
the approximate strength of an ineffable cardinal. | 1993-02-04 | 2008-02-03 | [
"math.LO"
] | Sy D. Friedman (MIT) |
math/9301210 | On the existence of atomic models | We give an example of a countable theory T such that for every cardinal
lambda >= aleph_2 there is a fully indiscernible set A of power lambda such
that the principal types are dense over A, yet there is no atomic model of T
over A. In particular, T(A) is a theory of size lambda where the principal
types are dense, yet... | 1993-01-15 | 2008-02-03 | [
"math.LO"
] | Michael C. Laskowski, Saharon Shelah |
math/9301205 | On the number of automorphism of uncontable models | Let s(A) denote the number of automorphisms of a model A of power omega_1. We
derive a necessary and sufficient condition in terms of trees for the existence
of an A with omega_1 < s(A) < 2^{omega_1}. We study the sufficiency of some
conditions for s(A)=2^{omega_1}. These conditions are analogous to conditions
studied ... | 1993-01-15 | 2016-09-06 | [
"math.LO"
] | Saharon Shelah, Heikki Tuuri, Jouko V\"a\"an\"anen |
math/9301207 | Explicitly nonstandard uniserial modules | A new construction is given of non-standard uniserial modules over certain
valuation domains; the construction resembles that of a special Aronszajn tree
in set theory. A consequence is the proof of a sufficient condition for the
existence of non-standard uniserial modules; this is a theorem of ZFC which
complements an... | 1993-01-15 | 2009-09-25 | [
"math.LO",
"math.RA"
] | Paul C. Eklof, Saharon Shelah |
math/9301206 | All meager filters may be null | We show that it is consistent with ZFC that all filters which have the Baire
property are Lebesgue measurable. We also show that the existence of a
Sierpinski set implies that there exists a nonmeasurable filter which has the
Baire property. | 1993-01-15 | 2009-09-25 | [
"math.LO"
] | Tomek Bartoszy\'nski, Martin Goldstern, Haim Judah, Saharon Shelah |
math/9301203 | A variety with solvable, but not uniformly solvable, word problem | In the literature two notions of the word problem for a variety occur. A
variety has a decidable word problem if every finitely presented algebra in the
variety has a decidable word problem. It has a uniformly decidable word problem
if there is an algorithm which given a finite presentation produces an
algorithm for so... | 1993-01-15 | 2016-09-06 | [
"math.LO",
"math.RA"
] | Alan H. Mekler, Evelyn Nelson, Saharon Shelah |
math/9301209 | Borel partitions of infinite subtrees of a perfect tree | A theorem of Galvin asserts that if the unordered pairs of reals are
partitioned into finitely many Borel classes then there is a perfect set P such
that all pairs from P lie in the same class. The generalization to n-tuples for
n >= 3 is false. Let us identify the reals with 2^omega ordered by the
lexicographical orde... | 1993-01-15 | 2016-09-06 | [
"math.LO"
] | Alain Louveau, Boban Veli\v{c}kovi\'c, Saharon Shelah |
math/9301204 | Some compact logics --- results in ZFC | We show that if we enrich first order logic by allowing quantification over
isomorphisms between definable ordered fields the resulting logic, L(Q_{Of}),
is fully compact. In this logic, we can give standard compactness proofs of
various results. Next, we attempt to get compactness results for some other
logics without... | 1993-01-15 | 2016-09-06 | [
"math.LO"
] | Alan H. Mekler, Saharon Shelah |
math/9301208 | Forcing isomorphism | A forcing extension may create new isomorphisms between two models of a first
order theory. Certain model theoretic constraints on the theory and other
constraints on the forcing can prevent this pathology. A countable first order
theory is classifiable if it is superstable and does not have either the
dimensional orde... | 1993-01-15 | 2016-09-06 | [
"math.LO"
] | John T. Baldwin, Michael C. Laskowski, Saharon Shelah |
math/9310234 | Symmetry of tilings of the plane | We discuss two new results on tilings of the plane. In the first, we give
sufficient conditions for the tilings associated with an inflation rule to be
uniquely ergodic under translations, the conditions holding for the pinwheel
inflation rule. In the second result we prove there are matching rules for the
pinwheel inf... | 1993-10-01 | 2008-02-03 | [
"math.MG",
"math.DS"
] | Charles Radin |
math/9307229 | A counterexample to Borsuk's conjecture | Let $f(d)$ be the smallest number so that every set in $R^d$ of diameter 1
can be partitioned into $f(d)$ sets of diameter smaller than 1. Borsuk's
conjecture was that $f(d)\! =\!d\!+\!1$. We prove that $f(d)\! \ge\!
(1.2)^{\sqrt d}$ for large~$d$. | 1993-07-01 | 2008-02-03 | [
"math.MG",
"math.CO"
] | Jeff Kahn, Gil Kalai |
math/9302210 | Random polytopes and affine surface area | Let K be a convex body in $R^d$. A random polytope is the convex hull
$[x_1,...,x_n]$ of finitely many points chosen at random in K. $\Bbb E(K,n)$ is
the expectation of the volume of a random polytope of n randomly chosen points.
I. B\'ar\'any showed that we have for convex bodies with $C^3$ boundary and
everywhere pos... | 1993-02-04 | 2016-09-06 | [
"math.MG",
"math.FA"
] | Carsten Sch\"utt |
math/9307234 | Average case complexity of linear multivariate problems | We study the average case complexity of a linear multivariate problem $(\lmp)$ defined on functions of $d$ variables. We consider two classes of information. The first $\lstd$ consists of function values and the second $\lall$ of all continuous linear functionals. Tractability of $\lmp$ means that the average case comp... | 1993-07-01 | 2025-10-20 | [
"math.NA",
"cs.NA",
"math.CA"
] | Henryk Woźniakowski |
math/9304214 | Wavelet transforms versus Fourier transforms | This note is a very basic introduction to wavelets. It starts with an orthogonal basis of piecewise constant functions, constructed by dilation and translation. The ``wavelet transform'' maps each $f(x)$ to its coefficients with respect to this basis. The mathematics is simple and the transform is fast (faster than the... | 1993-04-01 | 2025-10-20 | [
"math.NA",
"cs.NA",
"math.CA"
] | Gilbert Strang |
math/9304216 | Integration and approximation of multivariate functions: average case complexity with isotropic Wiener measure | We study the average case complexity of multivariate integration and $L_2$ function approximation for the class $F=C([0,1]^d)$ of continuous functions of $d$ variables. The class $F$ is endowed with the isotropic Wiener measure (Brownian motion in Levy's sense). Furthermore, for both problems, only function values are ... | 1993-04-01 | 2025-10-20 | [
"math.NA",
"cs.NA",
"math.CA"
] | Grzegorz W. Wasilkowski |
math/9307231 | On the passage from local to global in number theory | The author surveys the problem of piecing together integral or rational
solutions to Diophantine equations (global structure) from solutions modulo
congruences and real solutions (local structure). | 1993-07-01 | 2008-02-03 | [
"math.NT",
"math.AG"
] | Barry Mazur |
math/9304211 | On the distribution of sums of residues | We generalize and solve the $\roman{mod}\,q$ analogue of a problem of
Littlewood and Offord, raised by Vaughan and Wooley, concerning the
distribution of the $2^n$ sums of the form $\sum_{i=1}^n\varepsilon_ia_i$,
where each $\varepsilon_i$ is $0$ or $1$. For all $q$, $n$, $k$ we determine
the maximum, over all reduced ... | 1993-04-01 | 2016-09-06 | [
"math.NT",
"math.CO"
] | Jerrold R. Griggs |
math/9310233 | Harmonic analysis of fractal measures induced by representations of a
certain C$^*$-algebra | We describe a class of measurable subsets $\Omega$ in $\br^d$ such that
$L^2(\Omega)$ has an orthogonal basis of frequencies
$e_\lambda(x)=e^{i2\pi\lambda\cdot x}(x\in\Omega)$ indexed by
$\lambda\in\Lambda\subset\br^d$. We show that such spectral pairs $(\Omega
,\Lambda)$ have a self-similarity which may be used to gen... | 1993-10-01 | 2016-09-06 | [
"math.OA",
"math.FA"
] | Palle E. T. Jorgensen, Steen Pedersen |
math/9301219 | Factorizations of invertible operators and $K$-theory of $C^*$-algebras | Let $\Scr A$ be a unital C*-algebra. We describe \it K-skeleton
factorizations \rm of all invertible operators on a Hilbert C*-module $\Scr
H_{\Scr A}$, in particular on $\Scr H=l^2$, with the Fredholm index as an
invariant. We then outline the isomorphisms $K_0(\Scr A) \cong \pi
_{2k}([p]_0)\cong \pi _{2k} ({GL}^p_r(\... | 1993-01-01 | 2009-09-25 | [
"math.OA",
"math.AT"
] | Shuang Zhang |
math/9310225 | Coupling and Harnack inequalities for Sierpinski carpets | Uniform Harnack inequalities for harmonic functions on the pre- and graphical
Sierpinski carpets are proved using a probabilistic coupling argument. Various
results follow from this, including the construction of Brownian motion on
Sierpinski carpets embedded in $\R^d$, $d\geq 3$, estimates on the fundamental
solution ... | 1993-10-01 | 2016-09-06 | [
"math.PR"
] | Martin T. Barlow, Richard F. Bass |
math/9310236 | The birth of the giant component | Limiting distributions are derived for the sparse connected components that
are present when a random graph on $n$ vertices has approximately $\half n$
edges. In particular, we show that such a graph consists entirely of trees,
unicyclic components, and bicyclic components with probability approaching
$\sqrt{2\over 3} ... | 1993-10-01 | 2008-02-03 | [
"math.PR",
"math.CO"
] | Svante Janson, Donald E. Knuth, Tomasz {\L}uczak, Boris Pittel |
math/9310230 | A new measure of growth for countable-dimensional algebras | A new dimension function on countable-dimensional algebras (over a field) is
described. Its dimension values for finitely generated algebras exactly fill
the unit interval $[0,1]$. Since the free algebra on two generators turns out
to have dimension 0 (although conceivably some Noetherian algebras might have
positive d... | 1993-10-01 | 2008-02-03 | [
"math.RA"
] | John Hannah, K. C. O'Meara |
math/9304215 | An external approach to unitary representations | The main aim of this paper is to present the ideas which lead first to the
solution of the unitarizability problem for $\GL(n)$ over nonarchimedean local
fields and to the recognition that the same result holds over archimedean local
fields, a result which was proved by Vogan using an internal approach. Let us
say that... | 1993-04-01 | 2016-09-06 | [
"math.RT"
] | Marko Tadic |
math/9301214 | Homogeneous functions on light cones: the infinitesimal structure of
some degenerate principal series representations | In this paper we study the reducibility, composition series and unitarity of
the components of some degenerate principal series representations of
$\RMO(p,q)$, $\RMU(p,q)$ and $\SP(p,q)$. This is done by realizing these
representations in paces of homogeneous functions on light cones and writing
down the explicit actio... | 1993-01-01 | 2009-09-25 | [
"math.RT"
] | Roger E. Howe |
math/9312213 | Poisson structures on the cotangent bundle of a Lie group or a principal
bundle and their reductions | On a cotangent bundle $T\sp*G$ of a Lie group $G$ one can describe the
standard Liouville form $\theta$ and the symplectic form $d \theta$ in terms of
the right Maurer Cartan form and the left moment mapping (of the right action
of $G$ on itself), and also in terms of the left Maurer-Cartan form and the
right moment ma... | 1993-12-01 | 2016-09-06 | [
"math.SG",
"math.DG"
] | Dmitri V. Alekseevsky, Janusz Grabowski, Giuseppe Marmo, Peter W.
Michor |
math/9310229 | Trace formulae and inverse spectral theory for Schr\"odinger operators | We extend the well-known trace formula for Hill's equation to general
one-dimensional Schr\"odinger operators. The new function $\xi$, which we
introduce, is used to study absolutely continuous spectrum and inverse
problems. | 1993-10-01 | 2008-02-03 | [
"math.SP"
] | Fritz Gesztesy, Helge Holden, Barry Simon, Zhong Xin Zhao |
math/9307232 | Absence of Cantor spectrum for a class of Schr\"odinger operators | It is shown that the complete localization of eigenvectors for the almost
Mathieu operator entails the absence of Cantor spectrum for this operator. | 1993-07-01 | 2008-02-03 | [
"math.SP",
"math.CV"
] | Norbert Riedel |
nucl-th/9312022 | Dynamical Color Correlations in a $SU(2)_c$ Quark Exchange Model of
Nuclear Matter | The quark exchange model is a simple realization of an adiabatic
approximation to the strong-coupling limit of Quantum Chromodynamics (QCD): the
quarks always coalesce into the lowest energy set of flux tubes. Nuclear matter
is thus modeled in terms of its quarks. We wish to study the correlations
imposed by total wave... | 1993-12-29 | 2008-11-26 | [
"nucl-th",
"hep-ph"
] | S. Gardner (Indiana U.), C.J. Horowitz (Indiana U.), and J.
Piekarewicz (SCRI) |
nucl-th/9312021 | Meson phase space density from interferometry | The interferometric analysis of meson correlations provides a measure of the
average phase space density of the mesons in the final state. This quantity is
a useful indicator of the statistical properties of the system, and it can be
extracted with a minimum of model assumptions. Values obtained from recent
measurement... | 1993-12-28 | 2009-10-22 | [
"nucl-th"
] | George F. Bertsch |
nucl-th/9312017 | Complex Conjugate Pairs in Stationary Sturmians | Sturmian eigenstates specified by stationary scattering boundary conditions
are particularly useful in contexts such as forming simple separable two
nucleon t matrices, and are determined via solution of generalised eigenvalue
equation using real and symmetric matrices. In general, the spectrum of such an
equation may ... | 1993-12-22 | 2008-11-26 | [
"nucl-th"
] | P.J.Dortmans, L.Canton, G.Pisent, and K.Amos |
nucl-th/9312020 | Chaos Driven Decay of Nuclear Giant Resonances: Route to Quantum
Self-Organization | The influence of background states with increasing level of complexity on the
strength distribution of the isoscalar and isovector giant quadrupole resonance
in $^{40}$Ca is studied. It is found that the background characteristics,
typical for chaotic systems, strongly affects the fluctuation properties of the
strength... | 1993-12-22 | 2009-09-25 | [
"nucl-th"
] | S. Drozdz, S. Nishizaki and J. Wambach |
nucl-th/9312016 | Theory of Coupled Pion--Trinucleon Systems | We derive the dynamical equations which consistently couple the four--body
($\pi$NNN) system to the underlying three--nucleon system. Our treatment can be
considered the proper generalization of the Afnan--Blankleider equations for
the coupled NN--$\pi$NN system. The resulting connected--kernel equation
resembles in st... | 1993-12-22 | 2008-11-26 | [
"nucl-th"
] | L. Canton and G. Cattapan |
nucl-th/9312018 | On the nature of the large-$q$ expansion of the response for a
non-relativistic confined system | We show the equivalence of a previously derived exact expression for the
response of a non-relativistic system with harmonic forces and an infinite sum
of weighted $\delta$-functions corresponding to the spectrum. We forward
arguments, indicating that the Gersch-Rodriguez-Smith $1/q$-expansion of the
response does not ... | 1993-12-22 | 2009-10-22 | [
"nucl-th"
] | E. Pace, G. Salme and A.S. Rinat |
nucl-th/9312019 | The nuclear component of the EMC effect beyond the Plane Wave Impulse
Approximation | We study the response of a nucleus composed of nucleons and confined quarks.
Assuming dynamics implied by a non-relativistic cluster model, we prove that
the total response is a convolution of the responses of, respectively, a
nucleus with interacting point-nucleons and an isolated nucleon with confined
quarks. Definin... | 1993-12-22 | 2009-09-25 | [
"nucl-th"
] | S. A. Gurvitz and A.S. Rinat |
nucl-th/9312015 | Semiclassical Quark Model Of the Nuclear Matter Response | The longitudinal response function $R(q,w)$\ of nuclear matter is calculated
in a semiclassical quark model. The model has a many- body string-flip
potential that confines quarks into hadrons and avoids color van der Waals
forces. Molecular dynamics simulations are used to calculate $R(q,w)$\ in one
space dimension for... | 1993-12-20 | 2007-05-23 | [
"nucl-th"
] | W. Melendez and C. J. Horowitz |
nucl-th/9312013 | RPA equations and the instantaneous Bethe-Salpeter equation | We give a derivation of the particle-hole RPA equations for an interacting
multi-fermion system by applying the instantaneous approximation to the
amputated two-fermion propagator of the system. In relativistic field theory
the same approximation leads from the fermion-antifermion Bethe-Salpeter
equation to the Salpete... | 1993-12-20 | 2008-02-03 | [
"nucl-th",
"hep-ph"
] | J.Resag, D. Sch\"utte |
nucl-th/9312014 | On the angular momentum dependence of nuclear level densities | Angular momentum dependence of nuclear level densities at finite temperatures
are investigated in the static path approximation(SPA) to the partition
function using a cranked quadrupole interaction Hamiltonian in the following
three schemes: (i) cranking about x-axis, (ii) cranking about z-axis and (iii)
cranking about... | 1993-12-19 | 2009-10-22 | [
"nucl-th"
] | B. K. Agrawal and A. Ansari |
nucl-th/9312012 | S-wave $\pi$-Nucleus Repulsion and Dirac Phenomenology | A relativistic $\pi$-nucleon potential is extended to $m^* \neq m$ to
investigate the possibility of generating s-wave $\pi$-nucleus repulsion. We
find that relativity does indeed generate significant repulsion, the exact
amount depending on the details of the calculation. In contradistinction the
$t\rho$ approximation... | 1993-12-16 | 2009-10-22 | [
"nucl-th"
] | S. Chakravarti and B.K. Jennings |
nucl-th/9312011 | Superdeformed rotational bands in the Mercury region; A Cranked
Skyrme-Hartree-Fock-Bogoliubov study | A study of rotational properties of the ground superdeformed bands in \Hg{0},
\Hg{2}, \Hg{4}, and \Pb{4} is presented. We use the cranked
Hartree-Fock-Bogoliubov method with the {\skm} parametrization of the Skyrme
force in the particle-hole channel and a seniority interaction in the pairing
channel. An approximate par... | 1993-12-13 | 2015-06-26 | [
"nucl-th"
] | B. Gall, P. Bonche, J. Dobaczewski, H. Flocard and P.-H. Heenen |
nucl-th/9312010 | What can we learn from a second phi meson peak in ultrarelativistic
nuclear collisions? | The decay width of a phi meson is reduced from its vacuum value as its mass
decreases in hot hadronic matter as a result of the partial restoration of
chiral symmetry. This reduction is, however, cancelled by collisional
broadening through the reactions $\phi\pi\to KK^*$, $\phi K\to\phi K$,
$\phi\rho\to KK$, and $\phi\... | 1993-12-10 | 2009-09-25 | [
"nucl-th"
] | Che Ming Ko and David Seibert |
nucl-th/9312009 | Interference Effects in Relativistic Deuteron Electrodisintegration | We extend the relativistic plane--wave impulse approximation formalism to
incorporate a specific class of relativistic interference effects for use in
describing inclusive electrodisintegration of $^2$H. The role of these
``exchange'' terms for the various response functions accessible in
parity--conserving and --viola... | 1993-12-10 | 2009-10-22 | [
"nucl-th"
] | G.I. Poulis (TRIUMF) and T.W. Donnelly (MIT) |
nucl-th/9312008 | The Multifragmentation Freeze--Out Volume in Heavy Ion Collisions | The reduced velocity correlation function for fragments from the reaction Fe
+ Au at 100 A~MeV bombarding energy is investigated using the
dynamical--statistical approach QMD+SMM and compared to experimental data to
extract the Freeze--Out volume assuming simultaneous multifragmentation. | 1993-12-09 | 2009-10-22 | [
"nucl-th"
] | G.Peilert, T.C.Sangster, M.N.Namboodiri, and H.C.Britt |
nucl-th/9312006 | A Quark Model of Lambdabar-Lambda Production of Pbar-P Interactions | A quark model which includes both scalar and vector contributions to the
reaction mechanism (SV quark model) is used in a DWBA calculation of $\bar
\Lambda \Lambda$ production in $\bar p p$ interractions. Total and differential
cross-sections, polarizations, depolarizations, and spin-correlattion
coefficients are compu... | 1993-12-08 | 2009-09-25 | [
"nucl-th"
] | M.A. Alberg, E.M. Henley, L. Wilets and P.D. Kunz |
nucl-th/9312003 | Relativistic versus Nonrelativistic Optical Potentials in A(e,e'p)B
Reactions | We investigate the role of relativistic and nonrelativistic optical
potentials used in the analysis of ($e,e'p$) data. We find that the
relativistic calculations produce smaller ($e,e'p$) cross sections even in the
case in which both relativistic and nonrelativistic optical potentials fit
equally well the elastic proto... | 1993-12-07 | 2009-09-25 | [
"nucl-th"
] | J.M. Udias, P. Sarriguren, E. Moya de Guerra, E. Garrido and J.A.
Caballero |
nucl-th/9312005 | Cluster Structure of Disoriented Chiral Condensates in Rapidity
Distribution | We study the creation of disoriented chiral condensates with some initial
boundary conditions that may be expected in the relativistic heavy ion
collisions. The equations of motion in the linear $\sigma$-model are solved
numerically with and without a Lorentz-boost invariance. We suggest that a
distinct cluster structu... | 1993-12-07 | 2009-12-30 | [
"nucl-th",
"hep-ph"
] | Zheng Huang and Xin-Nian Wang |
nucl-th/9312004 | Reply to "Comment on 'Comparison of potential models with the
pp-scattering data below 350 MeV.' " | Replying to the above Comment by G.Q.Li and R.Machleidt, we point out that
the supposed "flaws" in our Comparison of NN potential models with the pp-
scattering data [ Phys.Rev.C47,761(1993) ] are in reality not flaws at all. | 1993-12-07 | 2007-05-23 | [
"nucl-th"
] | V.Stoks and J.J. de Swart |
nucl-th/9312007 | Double Beta Decay in pn-QRPA Model with Isospin and SU(4) Symmetry
Constraints | The transition matrix elements for the $0^{+}\to 0^{+}$ double beta decays
are calculated for $^{48}Ca$, $^{76}Ge $, $^{82}Se$, $^{100}Mo$, $^{128}Te$ and
$^{130}Te$ nuclei, using a ${\delta}$-interaction. As a guide, to fix the
particle-particle interaction strengths, we exploit the fact that the missing
symmetries of... | 1993-12-07 | 2016-08-14 | [
"nucl-th"
] | F. Krmpoti\'c and S. Shelly Sharma |
nucl-th/9312001 | Comment on "Phase-Shift Analysis of NN Scattering Below 160 Mev:
Indication of a Strong Tensor Force" | In his recent publication of a NN phase shift analysis below 160 MeV, Henneck
reports relatively large values for the mixing parameter $\epsilon_1$. Based on
these results, Henneck suggests that the strength of the $\rho$-meson tensor
coupling to the nucleon may be weaker than used in present day NN interactions,
like ... | 1993-12-01 | 2009-09-25 | [
"nucl-th"
] | G. E. Brown and R. Machleidt |
nucl-th/9312002 | Relativistic three-particle dynamical equations: II. Application to the
trinucleon system | We calculate the contribution of relativistic dynamics on the
neutron-deuteron scattering length and triton binding energy employing five
sets trinucleon potential models and four types of three-dimensional
relativistic three-body equations suggested in the preceding paper. The
relativistic correction to binding energy... | 1993-12-01 | 2011-05-12 | [
"nucl-th"
] | Sadhan K. Adhikari and Lauro Tomio |
nucl-th/9311036 | Polarization of the nuclear medium and RPA-type calculations in $K^+$
scattering from nuclei | In the calculation of the $K^+$-nucleus cross sections, the coupling of the
mesons exchanged between the $K^+$ and the target nucleons to the polarization
of the Fermi sea has been taken into account. This polarization has been
calculated in the one-loop approximation but summed up to all orders (RPA-type
calculation).... | 1993-11-30 | 2009-10-22 | [
"nucl-th"
] | J.C. Caillon and J. Labarsouque |
nucl-th/9311035 | Relativistic three-particle dynamical equations: I. Theoretical
development | Starting from the two-particle Bethe-Salpeter equation in the ladder
approximation and integrating over the time component of momentum, we rederive
three dimensional scattering integral equations satisfying constraints of
relativistic unitarity and covariance, first derived by Weinberg and by
Blankenbecler and Sugar. T... | 1993-11-29 | 2009-10-22 | [
"nucl-th"
] | Sadhan K. Adhikari, T. Frederico, and Lauro Tomio |
nucl-th/9311034 | A Model Study of the Strength Distribution for a Collective State
Coupled with Chaotic Background System | We consider a model in which a collective state couples to a large number of
background states. The background states can be chosen to have properties which
are classically characterized as regular or chaotic. We found that the
dynamical nature of the background system considerably affects some fluctuation
properties o... | 1993-11-27 | 2009-09-25 | [
"nucl-th"
] | H.Aiba and T.Suzuki |
nucl-th/9311032 | The $\pi \sigma$-Axial Exchange Current | The axial exchange current operator that arises from the coupling of the
axial field to the pion and effective scalar field in nuclei is constructed.
The spatial dependence of this exchange current operator may be determined
directly from the nucleon-nucleon interaction. This "$\pi\sigma$"-axial
exchange current contri... | 1993-11-25 | 2009-10-22 | [
"nucl-th"
] | K. Tsushima and D.O. Riska |
nucl-th/9311029 | The classification of diagrams in perturbation theory | The derivation of scattering equations connecting the amplitudes obtained
from diagrammatic expansions is of interest in many branches of physics. One
method for deriving such equations is the classification-of-diagrams technique
of Taylor. However, as we shall explain in this paper, there are certain points
of Taylor'... | 1993-11-25 | 2009-09-25 | [
"nucl-th",
"hep-ph"
] | D.R. Phillips and I.R. Afnan |
nucl-th/9311033 | Shell Effects in Nuclei Near Neutron Drip | Shell effects in nuclei close to the neutron-drip lines have been
investigated. It has been demonstrated in the relativistic mean-field theory
that nuclei very far from stability manifest the shell effects strongly. This
behaviour is in accord with the predictions of nuclear masses in the
finite-range droplet model inc... | 1993-11-25 | 2009-10-22 | [
"nucl-th"
] | M.M. Sharma, G.A. Lalazissis, W. Hillebrandt, and P.Ring (Max Planck
Institut of Astrophysics, and Technical University, Munich) |
nucl-th/9311030 | Slow proton production in deep-inelastic neutrino scattering on
deuterium | The cross section for semi-inclusive deep inelastic charged current neutrino
scattering on hydrogen and deuterium in which a slow proton is observed in
coincidence with the muon is computed as a function of Bjorken x and light-cone
momentum of the detected proton. In the Impulse Approximation contributions
from hadroni... | 1993-11-25 | 2016-09-08 | [
"nucl-th"
] | G.D. Bosveld, A.E.L. Dieperink and A.G. Tenner |
nucl-th/9311031 | Microscopic analysis of two-body correlations in light nuclei | Within a nonperturbative dynamical two-body approach - based on coupled
equations of motion for the one-body density matrix and the two-body
correlation function - we study the distribution of occupation numbers in a
correlated system close to the groundstate, the relaxation of single-particle
excitations and the dampi... | 1993-11-25 | 2009-10-22 | [
"nucl-th"
] | Andreas Peter, Wolfgang Cassing, Joern M. Haeuser and Alfred Pfitzner |
nucl-th/9311025 | Nuclear Polarization Corrections for the S--Levels of Electronic and
Muonic Deuterium | We calculate the second-order corrections to the atomic energy level shifts
in ordinary and muonic deuterium due to virtual excitations of the deuteron
which are important for ongoing and planned precise experiments in these
systems. For light atoms a method can be used in which the shift is expressed
as integrals over... | 1993-11-24 | 2009-10-22 | [
"nucl-th"
] | Yang Lu and R. Rosenfelder |
nucl-th/9311027 | Simple approximation for the starting-energy-independent two-body
effective interaction with applications to 6Li | We apply the Lee-Suzuki iteration method to calculate the linked-folded
diagram series for a new Nijmegen local NN potential. We obtain an exact
starting-energy-independent effective two-body interaction for a multi-shell,
no-core, harmonic-oscillator model space. It is found that the resulting
effective-interaction ma... | 1993-11-24 | 2009-10-22 | [
"nucl-th"
] | D.C. Zheng, B.R. Barrett, J.P. Vary and R. J. McCarthy |
nucl-th/9311024 | Chaotic Dynamics in the Framework of the Vlasov-Nordheim Equation | In the framework of the time-dependent mean field theory, we solve the
Vlasov-Nordheim equation and study the sensitive dependence of this highly
non-linear equation on the initial conditions. We find that, when nuclear
matter is inside the spinodal region, initially small differences between
similar trajectories grow ... | 1993-11-24 | 2009-09-25 | [
"nucl-th"
] | M. Baldo, G.F. Burgio and A. Rapisarda |
nucl-th/9311023 | Dilepton production from virtual bremsstrahlung induced by proton
capture | Dilepton production following radiative capture of a proton on a nuclear
target is studied in the Impulse Approximation. The cross section is decomposed
in terms of four time-like nuclear structure functions through a
longitudinal-transverse separation of the nuclear current. Using a simple PWIA
model, cross sections a... | 1993-11-24 | 2016-09-08 | [
"nucl-th"
] | D. Van Neck, A.E.L. Dieperink and O. Scholten |
nucl-th/9311026 | Nuclear Charge Radii and Electric Quadrupole Moments | Isotope shifts of the mean square radii (MSR) and electric quadrupole moments
of even-even nuclei with 20< Z < 98$ are calculated using a dynamical
microscopic model. A single particle Nilsson potential with the Seo set of
correction term parameters, the pairing forces in the BCS formalism and a long
range interaction ... | 1993-11-24 | 2009-09-25 | [
"nucl-th"
] | Bozena Nerlo-Pomorska and Beata Mach (UMCS, Lublin, Poland) |
nucl-th/9311028 | Thermal quark production in ultra-relativistic nuclear collisions | We calculate thermal production of u, d, s, c and b quarks in
ultra-relativistic heavy ion collisions. The following processes are taken into
account: thermal gluon decay (g to ibar i), gluon fusion (g g to ibar i), and
quark-antiquark annihilation (jbar j to ibar i), where i and j represent quark
species. We use the t... | 1993-11-24 | 2009-09-25 | [
"nucl-th",
"hep-ph"
] | Tanguy Altherr and David Seibert (Theory Division, CERN, CH-1211
Geneva 23, Switzerland) |
nucl-th/9311020 | Coherent Pion Radiation From Nucleon Antinucleon Annihilation | A unified picture of nucleon antinucleon annihilation into pions emerges from
a classical description of the pion wave produced in annihilation and the
subsequent quantization of that wave as a coherent state. When the constraints
of energy-momentum and iso-spin conservation are imposed on the coherent state,
the pion ... | 1993-11-23 | 2009-10-22 | [
"nucl-th"
] | R. D. Amado, F. Cannata, J. -P. Dedonder, M. P. Locher and Bin Shao |
nucl-th/9311021 | Rates for the reactions antiproton-proton --> pi phi and gamma phi | We study antiproton-proton annihilation at rest into $\pi\phi$ and
$\gamma\phi$. Rescattering by $\overline{K^*}K+K^*\overline{K}$ and
$\rho^{+}\rho^{-}$ for $\overline{p}p\rightarrow\pi\phi$ states is sizable, of
order $(0.90\, {\rm to}\,2.6)\times 10^{-4}$ in the branching ratio, but
smaller than experiment. For $\ov... | 1993-11-23 | 2015-06-26 | [
"nucl-th"
] | M.P. Locher, Y. Lu and B.S. Zou |
nucl-th/9311022 | Three-body resonances by complex scaling | It is demonstrated that the complex scaling method can be used in practical
calculations to localize three-body resonances. Our model example emphasizes
the fact that in three-body systems several essentially different asymptotic
behaviors can appear. We show that the possibility of these different
asymptotic configura... | 1993-11-23 | 2009-09-25 | [
"nucl-th"
] | Attila Csoto |
nucl-th/9311019 | Optical-Model Description of Time-Reversal Violation | A time-reversal-violating spin-correlation coefficient in the total cross
section for polarized neutrons incident on a tensor rank-2 polarized target is
calculated by assuming a time-reversal-noninvariant, parity-conserving
``five-fold" interaction in the neutron-nucleus optical potential. Results are
presented for the... | 1993-11-22 | 2009-09-25 | [
"nucl-th"
] | V. Hnizdo and C. R. Gould (TUNL) |
nucl-th/9311018 | Pion Properties in a Hot $\Pi N \Delta$ Gas | Based on a recent meson-exchange model for the vacuum $\pi\pi$ interaction we
compute selfconsistently the in-medium $\pi\pi$ scattering amplitude and pion
selfenergy in a hot $\pi N\Delta$ gas. The contributions to the pion selfenergy
are calculated from the $\pi\pi$ T-matrix as well as from p-wave interaction
with nu... | 1993-11-20 | 2010-11-01 | [
"nucl-th"
] | R. Rapp and J. Wambach |
nucl-th/9311017 | On Size and Shape of the Average Meson Fields in the Semibosonized Nambu
& Jona-Lasinio Model | We consider a two-flavor Nambu \& Jona-Lasinio model in Hartree approximation
involving scalar-isoscalar and pseudoscalar-isovector quark-quark interactions.
Average meson fields are defined by minimizing the effective Euklidean action.
The fermionic part of the action, which contains the full Dirac sea, is
regularized... | 1993-11-19 | 2015-06-26 | [
"nucl-th"
] | R.Wuensch, K.Goeke, Th.Meissner |
nucl-th/9311016 | Higher-shell corrections for systems with one and two valence nucleons:
A spin-orbit and tensor interaction analysis | It is shown that when higher-shell admixtures are included for systems with
two valence particles or holes, there are effects which are quite different
from those for one-valence-nucleon systems. For example, for nuclei with one
valence particle or hole, there is no first-order correction for the magnetic
dipole moment... | 1993-11-19 | 2009-09-25 | [
"nucl-th"
] | D.C. Zheng, L. Zamick and M. Fayache |
nucl-th/9311015 | Inclusive Quasielastic and Deep Inelastic Scattering of Polarized
Electrons by Polarized $^{3}$He} | A comprehensive treatement of the theoretical approach for describing nuclear
effects in inclusive scattering of polarized electrons by polarized $^3$He is
presented. | 1993-11-17 | 2009-09-25 | [
"nucl-th"
] | C. Ciofi degli Atti, S. Scopetta, E. Pace, G. Salm\`e |
nucl-th/9311014 | Semiclassical Analysis of the Supershell Effect in Reflection-Asymmetric
Superdeformed Oscillator | An oscillatory pattern in the smoothed quantum spectrum, which is unique for
single-particle motions in a reflection-asymmetric superdeformed oscillator
potential, is investigated by means of the semiclassical theory of shell
structure. Clear correspondence between the oscillating components of the
smoothed level densi... | 1993-11-15 | 2017-02-01 | [
"nucl-th"
] | Ken-ichiro Arita and Kenichi Matsuyanagi (Kyoto Univ.) |
nucl-th/9311013 | Electromagnetic Gauge Invariance of Chiral Hybrid Quark Models | In this work, we investigate the question, whether the conventional analysis
of the electromagnetic form factors of the nucleon, evaluated in the framework
of the cloudy bag model (CBM) or other chirally invariant hybrid quark models
utilizing the same philosophy, is gauge invariant. In order to address that
point, we ... | 1993-11-13 | 2008-11-26 | [
"nucl-th"
] | W. Koepf and E.M. Henley |
nucl-th/9311012 | Constraints on the $\pi NN$ Coupling Constant from the $NN$ System | The sensitivity of the deuteron and of $pp$ scattering to the $\pi NN$ and
$\rho NN$ coupling constants is investigated systematically. We find that the
deuteron can be described about equally well with either {\it large $\pi$ and
$\rho$} or {\it small $\pi$ and $\rho$} coupling constants. However, $pp$
scattering clea... | 1993-11-11 | 2009-09-25 | [
"nucl-th"
] | R. Machleidt and G. Q. Li (University of Idaho) |
nucl-th/9311011 | Deformed Gaussian Orthogonal Ensemble Analysis of the Interacting Boson
Model | A Deformed Gaussian Orthogonal Ensemble (DGOE) which interpolates between the
Gaussian Orthogonal Ensemble and a Poissonian Ensemble is constructed. This new
ensemble is then applied to the analysis of the chaotic properties of the low
lying collective states of nuclei described by the Interacting Boson Model
(IBM). Th... | 1993-11-11 | 2009-09-25 | [
"nucl-th"
] | M.P. Pato, C.A. Nunes, C.L. Lima, M.S. Hussein, Y. Alhassid |
nucl-th/9311010 | Exact, finite, and Hermitian fermion-pair-to-boson mapping | We discuss a general, exact (in that matrix elements are preserved) mapping
of fermion pairs to bosons, and find a simple factorization of the boson
representation of fermion operators. This leads to boson Hamiltonians that are
Hermitian and finite, with no more than two-body operators if the fermion
Hamiltonian has at... | 1993-11-10 | 2007-05-23 | [
"nucl-th"
] | Calvin W. Johnson and Joseph N. Ginocchio |
nucl-th/9311008 | Deep Inelastic Scattering from off-Shell Nucleons | We derive the general structure of the hadronic tensor required to describe
deep-inelastic scattering from an off-shell nucleon within a covariant
formalism. Of the large number of possible off-shell structure functions we
find that only three contribute in the Bjorken limit. In our approach the usual
ambiguities encou... | 1993-11-09 | 2009-09-25 | [
"nucl-th",
"hep-ph"
] | W.Melnitchouk (Regensburg), A.W.Schreiber (PSI) and A.W.Thomas
(Adelaide) |
nucl-th/9311007 | Nuclear shell-model calculations for 6Li and 14N with different NN
potentials | Two ``phase-shift equivalent'' local NN potentials with different
parametrizations, Reid93 and NijmII, which were found to give nearly identical
results for the triton by Friar et al, are shown to yield remarkably similar
results for 6Li and 14N in a (0+2)hw no-core space shell-model calculation. The
results are compar... | 1993-11-09 | 2009-09-25 | [
"nucl-th"
] | D. C. Zheng and B. R. Barrett |
nucl-th/9311009 | A Systematic Treatment of Triaxial Systems at High Spins. II | The BRST treatment of triaxial nuclei rotating at high spins, which had been
previously developed, is extended to relate states with neighboring values of
the angular momentum $I$. As a consequence, the irreducible multipole
transition operators can be unambiguously separated into their physical and
spurious components... | 1993-11-09 | 2009-10-22 | [
"nucl-th"
] | J. P. Garrahan and D. R. Bes |
nucl-th/9311006 | Is Schr\"{o}dinger's Conjecture for the Hydrogen Atom Coherent States
Attainable | We construct the most general SO(4,2) hydrogen atom coherent states which are
the counterpart of Schr\"{o}dinger's harmonic oscillator coherent states. We
show that these states cannot be localized and cannot follow the classical
orbits. Thus, Schr\"{o}dinger's conjecture for the hydrogen atom coherent
states is unatta... | 1993-11-08 | 2009-10-22 | [
"nucl-th",
"chao-dyn",
"nlin.CD"
] | Ivaylo Zlatev, Wei-Min Zhang and Da Hsuan Feng |
nucl-th/9311005 | Medium Modification to the $\Omega$-Meson Mass in the Walecka Model | We calculate the effective mass of the $\omega$ meson in nuclear matter in a
relativistic random-phase approximation to the Walecka model. The dressing of
the meson propagator is driven by its coupling to particle-hole pairs and
nucleon-antinucleon ($N\bar{N}$) excitations. We report a reduction in the
$\omega$-meson m... | 1993-11-05 | 2009-09-25 | [
"nucl-th"
] | H.-C. Jean, J. Piekarewicz and A. G. Williams |
nucl-th/9311004 | E2 properties of nuclei far from stability and the proton-halo problem
of 8B | E2 properties of A=6--10 nuclei, including those of nuclei far from
stability, are studied by a $(0+2)\hbar\omega$ shell-model calculation which
includes E2 core-polarization effects explicitly. The quadrupole moments and
the E2 transition strengths in A=6--10 nuclei are described quite well by the
present calculation.... | 1993-11-04 | 2009-10-22 | [
"nucl-th"
] | Hitoshi Nakada and Takaharu Otsuka |
nucl-th/9311003 | Two pion bound states in a hot pion gas | The occurrence of poles in the $2\pi$ propagator in a hot pion medium is
studied. The domain of non--trivial solutions to the corresponding bosonic gap
equation is investigated as a function of the chemical potential and
temperature of the gas. | 1993-11-03 | 2007-05-23 | [
"nucl-th"
] | G. Chanfray, P. Schuck, and G. Welke |
nucl-th/9311002 | Spectral asymmetries in nucleon sum rules at finite density | Apparent inconsistencies between different formulations of nucleon sum rules
at finite density are resolved through a proper accounting of asymmetries in
the spectral functions between positive- and negative-energy states. | 1993-11-03 | 2008-11-26 | [
"nucl-th",
"hep-ph"
] | R. J. Furnstahl |
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