5,115 research outputs found
Correlated random fields in dielectric and spin glasses
Both orientational glasses and dipolar glasses possess an intrinsic random
field, coming from the volume difference between impurity and host ions. We
show this suppresses the glass transition, causing instead a crossover to the
low phase. Moreover the random field is correlated with the inter-impurity
interactions, and has a broad distribution. This leads to a peculiar variant of
the Imry-Ma mechanism, with 'domains' of impurities oriented by a few frozen
pairs. These domains are small: predictions of domain size are given for
specific systems, and their possible experimental verification is outlined. In
magnetic glasses in zero field the glass transition survives, because the
random fields are disallowed by time-reversal symmetry; applying a magnetic
field then generates random fields, and suppresses the spin glass transition.Comment: minor modifications, final versio
The Scalar Sector and the Eta -> 3 Pi Problem
First, recent work on light scalar mesons, which is of possible interest in
connection with the strong coupling region of QCD is briefly discussed. Then a
very short highlighting of a paper concerned with an application to the eta ->
3 pi problem is presented.Comment: 7 pages LaTeX, 4 eps figures, talk at SCGT02 conference at Nagoy
Supersymmetric Higgs Triplets and Bilinear R-Parity Nonconservation
The supersymmetric standard model of particle interactions is extended to
include two Higgs triplet superfields at the TeV scale, carrying two units of
lepton number. Realistic tree-level Majorana neutrino masses are obtained in
the presence of soft, i.e. bilinear, R-parity nonconservation.Comment: 5 pages, no figur
Complementary Ansatz for the neutrino mass matrix
We propose a simple Ansatz for the three generation neutrino mass matrix
which is motivated from an SO(10) grand unified theory. The Ansatz can
be combined with information from neutrino oscillation experiments and bounds
on neutrinoless double beta decay to determine the neutrino masses themselves
and to reconstruct, with some assumptions, the matrix .Comment: 15 pages, RevteX, submitted to Phys. Rev.
A study of high frequency nonlinear combustion instability in baffled annular liquid propellant rocket motors
Computer program contains mathematical model which provides relationship between engine gas dynamics and combustion processes. Mathematically simulated explosions initiate gas disturbances. Design methods for damping disturbances can be studied to prevent future engine shutdown or destruction
A calibration of the stellar mass fundamental plane at z ~ 0.5 using the micro-lensing induced flux ratio anomalies of macro-lensed quasars
We measure the stellar mass surface densities of early type galaxies by
observing the micro-lensing of macro-lensed quasars caused by individual stars,
including stellar remnants, brown dwarfs and red dwarfs too faint to produce
photometric or spectroscopic signatures. Instead of observing multiple
micro-lensing events in a single system, we combine single epoch X-ray
snapshots of ten quadruple systems, and compare the measured relative
magnifications for the images with those computed from macro-models. We use
these to normalize a stellar mass fundamental plane constructed using a
Salpeter IMF with a low mass cutoff of 0.1 solar mass and treat the zeropoint
of the surface mass density as a free parameter. Our method measures the
graininess of the gravitational potential produced by individual stars, in
contrast to methods that decompose a smooth total gravitational potential into
two smooth components, one stellar and one dark. We find the median likelihood
value for the normalization factor F by which the Salpeter stellar masses must
be multiplied is 1.23, with a one sigma confidence range, dominated by small
number statistics, of 0.77 < F < 2.10Comment: Revised in response to referee's suggestions and re-submitted to ApJ;
changes to the adopted effective radii propagate to a new value of the factor
F (by which Salpeter stellar masses must be multiplied) of 1.2
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