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46 papers · 1 filter
Scaling theory of the Kondo screening cloud
Erik Sorensen, Ian Affleck
A scaling form for the local susceptibility, derived from renormalization group arguments, is proposed. The scale over which the uniform part of this scaling form varies can be vie…
Charge Screening in the Finite Temperature Schwinger Model
G. Grignani, G. Semenoff, P. Sodano +1
We compute the effective action and correlators of the Polyakov loop operator in the Schwinger model at finite temperature and discuss the realization of the discrete symmetries th…
Charge Screening and Confinement in Hot 3-D QED
G. Grignani, G. Semenoff, P. Sodano +1
We examine the possibility of a confinement-deconfinement phase transition at finite temperature in both parity invariant and topologically massive three-dimensional quantum electr…
Conformal Motions and the Duistermaat-Heckman Integration Formula
L. D. Paniak, G. W. Semenoff, R. J. Szabo
We derive a geometric integration formula for the partition function of a classical dynamical system and use it to show that corrections to the WKB approximation vanish for any Ham…
Gauged Yukawa Matrix Models and 2-Dimensional Lattice Theories
H. Hamidian, S. Jaimungal, G. W. Semenoff +2
We argue that chiral symmetry breaking in three dimensional QCD can be identified with Néel order in 2-dimensional quantum antiferromagnets. When operators which drive the chiral t…
A pair of interacting spins coupled to an environmental sea: dissipation and mutual decoherence
M. Dube, P. C. E. Stamp
We consider the quantum dynamics of two spin-1/2 systems, each coupled to a bath of oscillators, so that a bath-mediated coupling is generated between the spins. We find that the i…
Quantum Relaxation of Magnetisation in Magnetic Particles
N. V. Prokof'ev, P. C. E. Stamp
At temperatures below the magnetic anisotropy energy, monodomain magnetic systems (small particles, nanomagnetic devices, etc.) must relax quantum mechanically. This quantum relaxa…
Formation of High Redshift Objects in a Cosmic String Theory with Hot Dark Matter
R. Moessner, R. Brandenberger
Using a modification of the Zel'dovich approximation adapted to hot dark matter, the accretion of such matter onto moving cosmic string loops is studied. It is shown that a large n…
Gauge Vector Masses from Flat Connections?
Antti J. Niemi
We suggest that four dimensional massive gauge vectors could be described by coupling ordinary Yang-Mills theory to a topological gauge theory. For this the coupling should excite…
Lessons from : Vacuum structure, Asymptotic Series, Instantons and all that
Ariel R. Zhitnitsky
We discuss two dimensional with fermions in the fundamental as well as adjoint representation. We find factorial growth $\sim (g^2N_cπ)^{2k}\frac{(2k)!(-1)^{k-…
The Case Against Bimodal Star Formation in Elliptical Galaxies
Brad K. Gibson
We consider the present-day photometric and chemical properties of elliptical galaxies, adopting the bimodal star formation scenario of Elbaz, Arnaud & Vangioni-Flam (1995). These…
Restoration of isotropy on fractals
Martin T. Barlow, Kumiko Hattori, Tetsuya Hattori +1
We report a new type of restoration of macroscopic isotropy (homogenization) in fractals with microscopic anisotropy. The phenomenon is observed in various physical setups, includi…
Correlations in Ising chains with non-integrable interactions
B. Bergersen, Z. Racz, H. -J. Xu
Two-spin correlations generated by interactions which decay with distance r as r^{-1-sigma} with -1 <sigma <0 are calculated for periodic Ising chains of length L. Mean-field theor…
Two dimensional QCD with matter in adjoint representation: What does it teach us?
Ian I. Kogan, Ariel R. Zhitnitsky
We analyse the highly excited states in with adjoint matter by using such general methods as dispersion relations, duality and unitarity. We find…
Perturbation Theory around Non-Nested Fermi Surfaces I. Keeping the Fermi Surface Fixed
Joel Feldman, Manfred Salmhofer, Eugene Trubowitz
The perturbation expansion for a general class of many-fermion systems with a non-nested, non-spherical Fermi surface is renormalized to all orders. In the limit as the infrared cu…
Formation of Structure in the Universe
Robert H. Brandenberger
An introduction to modern theories for the origin of structure in the Universe is given. After a brief review of the growth of cosmological perturbations in an expanding Universe a…
Aharonov-Bohm Type Forces Between Magnetic Fluxons
Y. Aharonov, S. Nussinov, S. Popescu +1
Forces related to A-B phases between fluxons with are discussed. We find a type interaction screened on a scale . The forces exist on…
Is there an exponentially large Kondo screening cloud ?
Erik Sorensen, Ian Affleck
We make a precise scaling conjecture, based on renormalization group ideas, regarding the screening cloud around an impurity spin in the Kondo effect and test it numerically using…
Finding Apparent Horizons in Numerical Relativity
Jonathan Thornburg
This paper presents a detailed discussion of the ``Newton's method'' algorithm for finding apparent horizons in 3+1 numerical relativity. We describe a method for computing the Jac…
Optical phonons along the c axis of YBa_2Cu_3O_{6+x}, for x=0.5 -> 0.95
C. C. Homes, T. Timusk, D. A. Bonn +2
The c-axis polarized phonon spectra of single crystals of YBCO_{6+x} have been measured for the doping range x=0.5 -> 0.95, between 10 K and 300 K. The low background electronic co…
Hubble Space Telescope Observations of White Dwarfs in the Globular Cluster M4
Harvey B. Richer, Gregory G. Fahlman, Rodrigo A. Ibata +9
With the Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telescope, we have discovered in M4 (NGC 6121, C 1620-264) the first extensive sequence of cooling white dwarfs s…
Theory of Nuclear Magnetic Relaxation in Haldane Gap Antiferromagnets
Jacob Sagi, Ian Affleck
A theory of Nuclear Magnetic Resonance (NMR) is developed for integer-spin, one-dimensional antiferromagnets, which exhibit the Haldane gap. We consider free boson, free fermion an…
Integral Transforms for Conformal Field Theories with a Boundary
David M. McAvity
A new method is developed for solving the conformally invariant integrals that arise in conformal field theories with a boundary. The presence of a boundary makes previous techniqu…
Rho-Omega Mixing via QCD Sum Rules with Finite Mesonic Widths
M. J. Iqbal, Xuemin Jin, Derek B. Leinweber
Based on the analysis of both Borel and Finite-Energy QCD sum rules, the inclusion of finite mesonic widths leads to a dramatic effect on the predictions for the momentum dependenc…