The oscillation spectrum of a perturbed neutron star is intimately related to the physical
properties of the star, such as the equation of state. Observing pulsating neutron stars …

The present thesis attempts to study the effect of scalar fields on Hawking radiation and
quasinormal modes of black holes. We selected a static, spherically symmetric electrically …

Non hermitian Hamiltonians play an important role in the study of dissipative quantum
systems. We show that using states with time dependent normalization can simplify the …