Samir Mandal 

Centre for Space physics
Kolkata, India.

Title: Spectral Properties of Accretion Disk Around Compact Objects in High Energies

Abstract: We have calculated the spectrum of an accretion disk around a compact object by a model flow which includes standing shocks.  This model self-consistently explains the transition between hard  and soft states, as well as the origin of high energy power-law  spectrum in Mev range. We have used the fact that the shocks may accelerate electrons to a non-thermal distribution, which in turn produce power-law synchrotron photons in presence of magnetic field.

We incorporated inverse-Comptonization of these photons to generate the self-consistent spectrum. Also we have studied the effect of different flow parameters, like shock location, compression ratio etc. on the emitted spectrum.

Michael Rotondo

Relativstic Thomas Fermi approximation for nuclear matter in bulk

Authors Remo Ruffini, Michael Rotondo, Xue She Sheng
A general approach to analyze the electromagnetic field of nuclear matter in bulk is examined using a relativistic Thomas Fermi approximation. The inference of electromagnetic fields close to the vacuum polarization limit close to neutron star surfaces are presented.