Browsing Department of Physics by Author "Layek, Biswanath"

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The 8th workshop on high energy physics phenomenology (WHEPP-8) was held at the Indian Institute of Technology, Mumbai, India during January 5–16, 2004. One of the four working groups, group III was dedicated to QCD and heavy ion physics (HIC). The present manuscript gives a summary of the activities of group III during the workshop (see also [1] for completeness). The activities of group III were focused to understand the collective behaviours of the system formed after the collisions of two nuclei at ultra-relativistic energies from the interactions of the elementary degrees of freedom, i.e. quarks and gluons, governed by non-abelian gauge theory, i.e. QCD. This was initiated by two plenary talks on experimental overview of heavy ion collisions and lattice QCD and several working group talks and discussions.

Layek, Biswanath (Springer, 2003-11)

We show that cosmic strings moving through the plasma at the time of a first-order quark-hadron transition in the early universe generate baryon inhomogeneities, which can survive till the nucleosynthesis epoch. We find ...
Azimuthal flow of decay photons in relativistic nuclear collisions

Layek, Biswanath (APS, 2006-10)

An overwhelming fraction of photons from relativistic heavy-ion collisions has its origin in the decay of π0 and η mesons. We calculate the azimuthal asymmetry of the decay photons for several azimuthally asymmetric pion ...
Baryogenesis via density fluctuations with a second order electroweak phase transition

Layek, Biswanath (World Scientific, 2003)

We consider the presence of cosmic string induced density fluctuations in the universe at temperatures below the electroweak phase transition temperature. Resulting temperature fluctuations can restore the electroweak ...
Baryon inhomogeneities due to cosmic string wakes at the quark-hadron transition

Layek, Biswanath (Springer, 2003-05)

Baryon inhomogeneities generated during the quark-hadron transition may alter the abundances of light elements if they persist up to the time of nucleosynthesis. These inhomogeneities survive up to the nucleosynthesis epoch ...
Baryon inhomogeneity generation in the quark-gluon plasma phase

Layek, Biswanath (APS, 2006-05)

We discuss the possibility of generation of baryon inhomogeneities in a quark-gluon plasma phase due to moving Z(3) interfaces. By modeling the dependence of effective mass of the quarks on the Polyakov loop order parameter, ...
Baryon inhomogeneity generation via cosmic strings at QCD scale and its effects on nucleosynthesis

Layek, Biswanath (APS, 2003-04)

We have earlier shown that cosmic strings moving through the plasma at the time of a first order quark-hadron transition in the early universe can generate large scale baryon inhomogeneities. In this paper, we calculate ...
Bursts of gravitational waves due to crustquake from pulsars

Layek, Biswanath (Oxford, 2020-09)

Pulsars undergoing crustquake release strain energy, which can be absorbed in a small region inside the inner crust of the star and excite the free superfluid neutrons therein. The scattering of these neutrons with the ...
Cosmic string induced sheetlike baryon inhomogeneities at the quark-hadron transition

Layek, Biswanath (APS, 2001-03)

Cosmic strings moving through matter produce wakes where the density is higher than the background density. We investigate the effects of such wakes occurring at the time of a first order quark-hadron transition in the ...
Effects of phase transition induced density fluctuations on pulsar dynamics

Layek, Biswanath (Elsevier, 2015-07)

We show that density fluctuations during phase transitions in pulsar cores may have non-trivial effects on pulsar timings, and may also possibly account for glitches and anti-glitches. These density fluctuations invariably ...
Elliptic flow of decay photons

Layek, Biswanath (IAEA, 2006)

The elliptic flow of decay photons for several azimuthally asymmetric π0 and η distributions has been studied. The relation between υ2 of decay photons from hadrons and the υ2 of partons where the partons are recombined ...
Excited hadrons as a signal for quark–gluon plasma formation

Layek, Biswanath (World Scientific, 2006)

At the quark–hadron transition, when quarks get confined to hadrons, certain orbitally excited states, namely those which have excitation energies above the respective L = 0 states of the same order as the transition ...
Glitches due to quasineutron-vortex scattering in the superfluid inner crust of a pulsar

Layek, Biswanath (APS, 2023-01)

We revisit the mechanism of vortex unpinning caused by the neutron-vortex scattering [B. Layek and P. R. Yadav, Mon. Not. R. Astron. Soc. 499, 455 (2020)] in the inner crust of a pulsar. The strain energy released by the ...
High-density QCD phase transitions inside neutron stars: Glitches and gravitational waves

Layek, Biswanath (Springer, 2017-10)

We discuss physics of exotic high baryon density QCD phases which are believed to exist in the core of a neutron star. This can provide a laboratory for exploring exotic physics such as axion emission, KK graviton production ...
Isocurvature fluctuations through axion trapping by cosmic string wakes

Layek, Biswanath (APS, 2005-03)

We consider wakelike density fluctuations produced by cosmic strings at the quark-hadron transition in the early universe. We show that low momentum axions which are produced through the radiation from the axionic string ...
Modulation of pulse profile as a signal for phase transitions in a pulsar core

Layek, Biswanath (OUP, 2022-04)

We calculate detailed modification of pulses from a pulsar arising from the effects of phase transition induced density fluctuations on the pulsar moment of inertia. We represent general statistical density fluctuations ...
Probing Dynamics of Phase Transitions Occurring Inside a Pulsar

Layek, Biswanath (Springer, 2015-12)

During the evolution of a pulsar, various phase transitions may occur in its dense interior, such as superfluid transition, as well as transition to various exotic phases of quantum chromodynamics (QCD). We propose a ...
QCD, Gravitational Waves, and Pulsars

Layek, Biswanath (ARXIV, 2023-05)

Investigations of the phase diagram of quantum chromodynamics (QCD) have revealed that exotic new phases, the so called {\it color superconducting phases}, may arise at very high baryon densities. It is speculated that ...
Skyrmion formation in 1+1 dimensions with chemical potential

Layek, Biswanath (World Scientific, 2006)

Formation of topological objects during phase transitions has been discussed extensively in literature. In all these discussions, defects and antidefects form with equal probabilities. In contrast, many physical situations, ...
Strings with a confining core in a quark-gluon plasma

Layek, Biswanath (APS, 2005-04)

We consider the intersection of N different interfaces interpolating between different ZN vacua of an SU(N) gauge theory using the Polyakov loop order parameter. Topological arguments show that at such a stringlike junction, ...
Vortex unpinning due to crustquake-initiated neutron excitation and pulsar glitches

Layek, Biswanath (Oxford, 2020-09)

Pulsars undergoing crustquake release strain energy, which can be absorbed in a small region inside the inner crust of the star and excite the free superfluid neutrons therein. The scattering of these neutrons with the ...

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