19,057 research outputs found
Resonant mesomolecule formation
The dtm and ddm resonant fusion rates are calculated taking into account
finite resonance width and subthreshold resonances. Calculations do not use
multipole expansion of the potential. The obtained ddm resonant fusion rates
are compared with recent data at 30-360 K.Comment: 3 pages, 2 figure
Breaking a "poor man" RG approach in the Luttinger liquid with one impurity
Using derived previously effective theory we explore conductance in the
Luttinger model with one impurity.
A new approach to the renormalization group (RG) analysis of this model is
developed. It is based on the original Gell-Mann-Low formulation of RG. We sum
up infrared logarithmic contibutions to conductance in the leading and few
subsequent approximations. We analyze the validity of widely used ``poor
man's'' scaling approach and find that it is applicable only in the leading
approximation. Our results for corrections to this approximation are different
from results obtained in other papers.
It should be expected beforehand, as Gell-Mann-Low function of the model is
not regularization scheme invariant. For this reason the observed quantity
(e.g., conductance) can not satisfy the Gell-Mann-Low equation beyond the
"leading-log"\ approximation as it is supposed in the "poor man's" approach.
We formulate the method to calculate the conductance from renormalized
hamiltonian in the post-leading approximations and match results to the case of
weak impurity where the answer is known in any order in electron-electron
interaction.Comment: 28 pages, 4 figures. Corrections and extensions as compared to
previous version. This is a version published in journa
Diffractive Scattering: Problems in Theory and Praxis
A concise survey of problems in modern strong interaction physics at high
energies is given.Comment: 7 page
One-dimensional strongly interacting electrons with single impurity: conductance reemergence
We show that conductance of 1D channel with one point-like impurity
critically depends on asymptotic behavior of e-e interaction at small momenta k
(about inverse length of a channel). Conductance reemerges (contrary to the
case of point-like repulsive potential) if potential V(k=0)= 0. For example,
this happens if the bare e-e interaction is screened by the charges in the
bulk. The relation of this phenomena to the long-range order present in the
Luttinger model is discussed.Comment: The version of the article will be published in JETP Letter
Kosterlitz-Thouless phase in systems of one-dimensional strongly interacting fermions
We present the ground state wave functions for systems of one-dimensional
interacting fermions. It is shown that these systems undergo phase transitions
similar to the Kosterlitz-Thouless one independently of the interaction
details. In the limit of an infinitely strong interaction the phase transition
turns into the usual second order phase transition in a chiral phase. The
temperature of the phase transition is calculated.Comment: 24 page
Nucleon Spin Puzzle: Ten Years Later
This is a brief survey of the present state of ideas concerning the parton
content of the nucleon spin after their ten-years evolution since the discovery
of the EMC.Comment: 5 pages, latex fil
Random membrane model for lattice gluodynamics
odel for studying coupling dependence on lattice spacing a in gluodynamics is
suggested. The model predicts $g-> g_{0}>0 with a->0. Free energy density in
the model does not depend on temperature
On the Soviet Contribution to the Discovery of Quark Color (Against One False Revision)
A critical discussion of recent attempts to revise the modern physics history
is presented.Comment: 5 page
The interval description of dynamics of celestial bodies in the planetary problem
The interval approach to computation of dynamics of celestial bodies in the
planetary problem has been considered. It is based on the refusal from
idealization of infinitely high resolving capacity of measuring tools, and
forms an absolutely exact algorithm free of round-off error accumulation
effect. The possibilities of the proposed approach are shown by the examples of
Kepler's Problem and the problem of stability of the Solar system major planets
for time interval of 6 billion years. The comparison of the interval and
classical predictions of Kepler's particle location in Kepler's orbit provides
support for the effect predicted by the theory, namely - conservation of the
interval within which the values of difference of interval and classical
coordinates lay with time. The computational results of the Solar system major
planet orbital dynamics agree with the results obtained with the classical
approach.Comment: 6 pages, 7 figure
Combinatorial and Probabilistic Formulae for Divided Symmetrization
Divided symmetrization of a function is symmetrization of
the ratio where the
product is taken over the set of edges of some graph . We concentrate on the
case when is a tree and is a polynomial of degree , in this case
is a constant function. We give a combinatorial interpretation of the
divided symmetrization of monomials for general trees and probabilistic game
interpretation for a tree which is a path. In particular, this implies a result
by Postnikov originally proved by computing volumes of special polytopes, and
suggests its generalization
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