41,538 research outputs found
The Development of the Forbush Decrease and the Geomagnetic Storm Fields
Relationships between Forbush decreases and associated geomagnetic storm characteristic
Non-axisymmetric oscillations of rapidly rotating relativistic stars by conformal flatness approximation
We present a new numerical code to compute non-axisymmetric eigenmodes of
rapidly rotating relativistic stars by adopting spatially conformally flat
approximation of general relativity. The approximation suppresses the radiative
degree of freedom of relativistic gravity and the field equations are cast into
a set of elliptic equations. The code is tested against the low-order f- and
p-modes of slowly rotating stars for which a good agreement is observed in
frequencies computed by our new code and those computed by the full theory.
Entire sequences of the low order counter-rotating f-modes are computed, which
are susceptible to an instability driven by gravitational radiation.Comment: 3 figures. To appear in Phys.Rev.
The structure of the solar plasma flow generated by solar flares
Geomagnetic storm characteristics for two-dimensional configuration of solar plasma flow generated by solar flare
Exact renormalization group equation in presence of rescaling anomaly
Wilson's approach to renormalization group is reanalyzed for supersymmetric
Yang-Mills theory. Usual demonstration of exact renormalization group equation
must be modified due to the presence of the so called Konishi anomaly under the
rescaling of superfields. We carry out the explicit computation for N=1 SUSY
Yang-Mills theory with the simpler, gauge invariant regularization method,
recently proposed by Arkani-Hamed and Murayama. The result is that the
Wilsonian action S_M consists of two terms, i.e. the non anomalous term, which
obeys Polchinski's flow equation and Fujikawa-Konishi determinant contribution.
This latter is responsible for Shifman-Vainshtein relation of exact
beta-function.Comment: 19 pages, no figures; an appendix and reference added; typos
correcte
Atomically straight steps on vicinal Si (111) surfaces prepared by step-parallel current in the kink-up direction
We demonstrate that annealing of a vicinal Si(111) surface at about 800 C
with a direct current in the direction that ascends the kinks enhances the
formation of atomically straight step edges over micrometer lengths, while
annealing with a current in the opposite direction does not. Every straight
step edge has the same atomic configuration U(2,0), which is useful as a
template for the formation of a variety of nanostructures. A phenomenological
model based on electromigration of charged mobile atoms explains the observed
current-polarity dependent behavior.Comment: Accepted for publication in Appl. Phys. Lett. Numbers of pages and
figures are 12 and 4, respectivel
- …