4,813 research outputs found
Itinerant Ferromagnetism in the electronic localization limit
We present Hall effect, , and magnetoresistance, ,
measurements of ultrathin films of Ni, Co and Fe with thicknesses varying
between 0.2-8 nm and resistances between 1 M - 100 Both
measurements show that films having resistance above a critical value, ,
(thickness below a critical value, ) show no signs for ferromagnetism.
Ferromagnetism appears only for films with , where is material
dependent. We raise the possibility that the reason for the absence of
spontaneous magnetization is suppression of itinerant ferromagnetism by
electronic disorder in the strong localization regime.Comment: 4 pages, 4 figure
Optical counterparts of cosmological GRBs due to heating of ISM in the parent galaxy
We investigated influence of cosmological GRB on the surrounding interstellar
medium. It was shown that \gamma-radiation from the burst heats interstellar
gas to the temperatures > 10^4 K up to the distance \sim 10 pc. For high
density ISM optical and UV radiation of the heated gas can be observed on the
Eath several years as a GRB`s counterpartComment: 2 pages, 1 figure; presented at the Rome Conference on Gamma Ray
Bursts in the Afterglow Ag
Reply to [arXiv:1201.5347] "Comment on 'Vortex-assisted photon counts and their magnetic field dependence in single-photon superconducting detectors'"
We argue that cutoff in the London model cannot be settled without use of the
microscopic theory
Area Law and Continuum Limit in "Induced QCD"
We investigate a class of operators with non-vanishing averages in a
D-dimensional matrix model recently proposed by Kazakov and Migdal. Among the
operators considered are ``filled Wilson loops" which are the most reasonable
counterparts of Wilson loops in the conventional Wilson formulation of lattice
QCD. The averages of interest are represented as partition functions of certain
2-dimensional statistical systems with nearest neighbor interactions. The
``string tension" , which is the exponent in the area law for the
``filled Wilson loop" is equal to the free energy density of the corresponding
statistical system. The continuum limit of the Kazakov--Migdal model
corresponds to the critical point of this statistical system. We argue that in
the large limit this critical point occurs at zero temperature. In this
case we express in terms of the distribution density of eigenvalues
of the matrix-valued master field. We show that the properties of the continuum
limit and the description of how this limit is approached is very unusual and
differs drastically from what occurs in both the Wilson theory () and in the ``adjoint'' theory (). Instead, the continuum limit of the model appears to be
intriguingly similar to a string theory.Comment: 38 page
Continuum Limits of ``Induced QCD": Lessons of the Gaussian Model at d=1 and Beyond
We analyze the scalar field sector of the Kazakov--Migdal model of induced
QCD. We present a detailed description of the simplest one dimensional
{()} model which supports the hypothesis of wide applicability of the
mean--field approximation for the scalar fields and the existence of critical
behaviour in the model when the scalar action is Gaussian. Despite the
ocurrence of various non--trivial types of critical behaviour in the
model as , only the conventional large- limit is
relevant for its {\it continuum} limit. We also give a mean--field analysis of
the model in {\it any} and show that a saddle point always exists in
the region . In it exhibits critical behaviour as
. However when there is no critical
behaviour unless non--Gaussian terms are added to the scalar field action. We
argue that similar behaviour should occur for any finite thus providing a
simple explanation of a recent result of D. Gross. We show that critical
behaviour at and can be obtained by adding a
term to the scalar potential. This is equivalent to a local
modification of the integration measure in the original Kazakov--Migdal model.
Experience from previous studies of the Generalized Kontsevich Model implies
that, unlike the inclusion of higher powers in the potential, this minor
modification should not substantially alter the behaviour of the Gaussian
model.Comment: 31 page
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