3,884 research outputs found
Glassy Aging with Modified Kohlrausch-Williams-Watts Form
In this report we address the question whether aging in the non equilibrium
glassy state is controlled by the equilibrium alpha-relaxation process which
occur at temperatures above Tg. Recently Lunkenheimer et. al. [Phys. Rev. Lett.
95, 055702 (2005)] proposed a model for the glassy aging data of dielectric
relaxation using a modified Kohlrausch-Williams-Watts (KWW) form. The aging
time dependence of the relaxation time is defined by these authors through a
functional relation involving the corresponding frequency but the stretching
exponent is same as the alpha-relaxation stretching exponent. We present here
an alternative functional form directly involving the relaxation time itself.
The proposed model fits the data of Lunkenheimer et. al. perfectly with a
stretching exponent different from the alpha-relaxation stretching exponent.Comment: 1 TeX file, 10 eps figure
Understanding contextualised rational action - author's response
Understanding contextualised rational action - author's respons
A Simple Testable Model of Baryon Number Violation: Baryogenesis, Dark Matter, Neutron-Antineutron Oscillation and Collider Signals
We study a simple TeV-scale model of baryon number violation which explains
the observed proximity of the dark matter and baryon abundances. The model has
constraints arising from both low and high-energy processes, and in particular,
predicts a sizable rate for the neutron-antineutron () oscillation
at low energy and the monojet signal at the LHC. We find an interesting
complementarity among the constraints arising from the observed baryon
asymmetry, ratio of dark matter and baryon abundances, oscillation
lifetime and the LHC monojet signal. There are regions in the parameter space
where the oscillation lifetime is found to be more constraining
than the LHC constraints, which illustrates the importance of the
next-generation oscillation experiments.Comment: 8 pages, 4 figures; minor changes, version to appear in Phys. Lett.
Prospects for discovery and spin discrimination of dark matter in Higgs portal DM models and their extensions at 100 TeV collider
We study the discovery and discriminating prospects of the Higgs portal dark
matter (DM) models for scalar, fermion and vector DM and their extensions in
proton-proton () collisions. The DM associated production in
dileptonic final states is considered, in which the stransverse mass of two
leptons is found to be effective in suppressing the Standard Model backgrounds
along with the missing transverse energy and the angle between two leptons. The
distributions of missing transverse energy and polar angle between two leptons
are used for a discrimination of the spin nature of DM. For the proposed
benchmark points, the discovery/exclusion can be made with an integrated
luminosity less than 1 ab given a 1\% systematic uncertainty, while the
spin discrimination require integrated luminosity of a few O(10) ab
given a 0.5\% systematic uncertainty. The DM phenomenology is also discussed. A
consistent DM candidate can be obtained either by extending our model where the
Higgs portal couples to excited dark states that decay into DM, or modifying
the coupling form into pseudoscalar.Comment: 25 pages, 13 figures; discussions of systematic uncertainty added;
matches the published versio
- …