323 citations · 1.4k across the 51 of their papers we have counts for
19 papers · 1 filter
Entropy & viscosity bound of strange stars
Sibasish Laha, Taparati Gangopadhyay, Manjari Bagchi +4
At finite temperature (T) there is a link with general relativity and hydrodynamics that leads to a lower bound for the ratio of shear viscosity and entropy density (η/s). We find…
Addendum to ``Decoupling of pion coupling from quarks at high density in three models, and its possible observational consequences"
Manjari Bagchi, Monika Sinha, Mira Dey +1
The pions decouple from quarks while their coupling to nucleons remains unchanged at high density. This will have consequences for some recent papers.
High Density Strange Star Matter and Observed Parity Doubling of Excited Hadrons
Taparati Gangopadhyay, Manjari Bagchi, Mira Dey +2
Parity doubling is observed in hadron states around 1.5 GeV - and the estimated energy density is found to be high. When a large excitation energy is available and the pions decoup…
Decoupling of pion coupling f_π from quarks at high density in three models, and its possible observational consequences
Manjari Bagchi, Monika Sinha, Mira Dey +1
Chiral symmetry is restored at high density, quarks become nearly massless and pion, the Goldstone of the symmetry breaking decouples from the quarks. What happens at high density…
Mean field baryon magnetic moments and sumrules
Manjari Bagchi, Sukanta Daw, Mira Dey +1
New developments have spurred interest in magnetic moments (-s) of baryons. The measurement of some of the decuplet -s and the findings of new sumrules from various methods a…
Density dependence of pion coupling, , from three models
Manjari Bagchi, Monika Sinha, Mira Dey +1
This paper is withdrawn by the authors, a better version is available as hep-ph/0505139.
A model finding a new Richardson potential with different scales for confinement and asymptotic freedom, by fitting the properties of ${\D}^{++}$ and ${\Om}^{-}$
Manjari Bagchi, Mira Dey, Sukanta Daw +1
Phenomenological Richardson potential has built in asymptotic freedom (AF in short) and confinement, with only one parameter $\La$ in the potential. But it is known that the scales…
Two new sum rules for octet-baryon magnetic moments (μ) and constraints on QCD sum rules from new experimental determination of μ-s for the decuplet
Monika Sinha, Ashik Iqubal, Mira Dey +1
Recently the μ_{Δ^{++}} was found from a fit to (π^+)p scattering. This enable us to pinpoint condensate parameters more precisely in the context of QCD sum rules (QCDSR). In the o…
Incompressibility of strange matter
Monika Sinha, Manjari Bagchi, Jishnu Dey +3
Strange stars calculated from a realistic equation of state (EOS), that incorporate chiral symmetry restoration as well as deconfinement at high density show compact objects in the…
Magnetic Moment of the in QCD sumrule (QCDSR)
Jishnu Dey, Mira Dey, Ashik Iqubal
The magnetic moment was measured very accurately and experimentalists remarked that it differs from the theoretical estimates, thus posing a challenge to the latter. One such…
Limiting temperature of hadrons using states predicted from kappa-deformed Poincaré algebra
Jishnu Dey, Siddhartha Bhowmik, Kanad Ray +1
The experimental hadronic density of states dN/dm, assumed to be a sum of normalized Breit- Wigner distributions and plotted as a function of the hadron mass m, fails to show a Hag…
Non-linear Regge spectrum fits to experimentally up-dated meson states
Jishnu Dey, Mira Dey, P. Leal Ferreira +1
The exciting feature of recent times is the inflow of new experimental data. Fits to the $π, \r$ and f meson resonances found by the VES collaboration, along with those of the PDG…
Is SAX J1808.4-3658 a Strange Star ?
X. -D. Li, I. Bombaci, Mira Dey +2
One of the most important questions in the study of compact objects is the nature of pulsars, including whether they are composed of -stable nuclear matter or strange quark matt…
Uses of QCD sumrules (QCDSR) from different points of view
Jishnu Dey, Mira Dey, Mahendra Sinha Roy
We support the idea that the baryon, B with mass , couples to its current with a coupling $\la_{B}^2 \sim 0.71 M_B^6$ from an analysis of magnetic moment sum rules. And we fin…
Scaling Law for Baryon Coupling to its Current and its possible applications
Jishnu Dey, Mira Dey, T. Frederico +1
The baryon- coupling to its current (), in conventional QCD sum rule calculations (QCDSR), is shown to scale as the cubic power of the baryon mass, . Some theoretical j…
QCD phase transitions from relativistic hadron models
A. Delfino, Jishnu Dey, Mira Dey +1
The models of translationally invariant infinite nuclear matter in the relativistic mean field models are very interesting and simple, since the nucleon can connect only to a const…
The connection between the nuclear matter mean-field equation of state and the quark and gluon condensates at high density
M. Malheiro, Mira Dey, A. Delfino +1
It is known now that chiral symmetry restoration requires the meson-nucleon coupling to be density dependent in nuclear-matter mean-field models. We further show that quite general…
Observed Supersymmetry and Parity Doubling of Excited Hadrons from a Simple Spectrum-Generating Algebra
Jishnu Dey, Mira Dey
We find remarkable agreement with the observed excitations of hadrons with a simple three parameter mass relation of the SU(3) subgroup of the underlying U(15/30) graded Lie group.…
Problem of Statistical Model in Deep Inelastic Scattering Phenomenology
Jishnu Dey, Lauro Tomio, Mira Dey
Recent Deep Inelastic data leads to an up-down quark asymmetry of the nucleon sea. Explanations of the flavour asymmetry and the di-lepton production in proton-nucleus collisions c…