703 research outputs found
Astrophysical aspects of neutrino dynamics in ultra-degenerate quark gluon plasma
The cardinal focus of the present review is to explore the role of neutrinos
originating from the ultra-dense core of neutron stars composed of quark gluon
plasma in the astrophysical scenario. The collective excitations of the quarks
involving the neutrinos through the different kinematical processes have been
studied. The cooling of the neutron stars as well as pulsar kicks due to
asymmetric neutrino emission have been discussed in detail. Results involving
calculation of relevant physical quantities like neutrino mean free path and
emissivity have been presented in the framework of non-Fermi liquid behavior as
applicable to ultra-degenerate plasma.Comment: 10 pages, 9 figures, Accepted for publication as Review Article in
Advances of High Energy Physics. arXiv admin note: text overlap with
arXiv:1204.2684; text overlap with arXiv:0706.4381 by other author
Role of magnetic interactions in neutron stars
In this work, we present a calculation of the non-Fermi liquid correction to
the specific heat of magnetized degenerate quark matter present at the core of
the neutron star. The role of non-Fermi liquid corrections to the neutrino
emissivity has been calculated beyond leading order. We extend our result to
the evaluation of the pulsar kick velocity and cooling of the star due to such
anomalous corrections and present a comparison with the simple Fermi liquid
case.Comment: 6 pages, Proceedings of the 3rd International Conference on New
Frontiers in Physics, Kolymbari, Crete, Greece (matches published version
Topology of Quantum Grey Soliton in Multi-Component Inhomogeneous Bose-Einstein Condensates
We study the dispersion mechanism of Lieb mode excitations of both single and
multi component ultra-cold atomic Bose gas, subject to a harmonic confinement
through chirp management. It is shown that in some parameter domain, the
hole-like excitations lead to the soliton's negative mass regime, arising due
to the coupling between chirp momentum and Kohn mode. In low momenta region the
trap considerably affects the dispersion of the grey soliton, which opens a new
window to observe Lieb-mode excitations. Further, we extend our analysis to
binary condensate, which yields usual shape compatible grey-bright soliton
pairs. The inter-species interaction induces a shift in the Lieb-mode
excitations, where the pair can form a bound state. We emphasize that the
present model provides an opportunity to study such excitations in the low
momenta regime, as well as the formation of bound state in binary condensate.Comment: 9 pages, 7 figure
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