Debades Bandyopadhyay

Dense Nuclear Matter in a Strong Magnetic Field

We investigate in a relativistic Hartree theory the gross properties of cold symmetric nuclear matter and nuclear matter in beta equilibrium under the influence of strong magnetic fields. If the field strengths are above the critical values for electrons and protons, the respective phase spaces are strongly modified. This results in additional binding of the systems with distinctively softer equations of state compared to the field free cases. For magnetic field {approximately}10{sup 20}G and beyond, the nuclear matter in beta equilibrium practically converts into a stable proton-rich matter. {copyright} {ital 1997} {ital The American Physical Society}

Quantizing Magnetic Field and Quark-Hadron Phase Transition in a Neutron Star

We investigate the influence of a strong magnetic field on various properties of neutron stars with quark-hadron phase transition. The one-gluon exchange contribution in a magnetic field is calculated in a relativistic Dirac-Hartree-Fock approach. In a magnetic field of 5{times}10{sup 18} G in the center of the star, the overall equation of state is softer in comparison to the field-free case resulting in the reduction of maximum mass of the neutron star. {copyright} {ital 1997} {ital The American Physical Society}

Thermostatic properties of finite and infinite nuclear systems

Abstract From a constructed finite-range momentum- and density-dependent effective interaction, we arrive at the equation of state for infinite nuclear matter. This interaction reproduces ground-state properties of finite nuclear systems; in addition it gives a proper energy dependence of the single-particle potential. For symmetric and asymmetric hot nuclear matter, we find the critical and phase-separation temperature, the specific heats, incompressibility and variations of effective mass with temperature and density. For finite nuclei, we also find the limiting temperature, i.e. the maximum temperature that such nuclear systems can sustain.

Rapid cooling of magnetized neutron stars

The neutrino emissivities resulting from direct URCA processes in neutron stars are calculated in a relativistic Dirac-Hartree approach in presence of a magnetic field. In a quark or a hyperon matter environment, the emissivity due to nucleon direct URCA processes is suppressed relative to that from pure nuclear matter. In all the cases studied, the magnetic field enhances emissivity compared to the field-free cases.

A Third family of superdense stars in the presence of anti-kaon condensates

The formation of

Antikaon condensation in neutron stars

K^-

Effect of hyperon-hyperon interaction on bulk viscosity and r-mode instability in neutron stars

and

Incompressibility of asymmetric nuclear matter

\bar K^0

Density dependent hadron field theory for neutron stars with antikaon condensates

condensation in

Antikaon condensation and the metastability of protoneutron stars

\beta