Perturbations in dense matter relativistic stars induced by internal sources

TL;DR

This paper develops a new formalism incorporating perturbations driven by internal sources in dense matter relativistic stars, aiming to understand intermediate scale physics and turbulence effects within such compact objects.

Contribution

It introduces a novel response kernel linking metric and fluid perturbations and explores both deterministic and stochastic perturbations in relativistic star models.

Findings

Formulated a new response kernel for perturbations.

Analyzed stochastic and deterministic perturbations in star models.

Outlined potential for probing intermediate scales and turbulence effects.

Abstract

Einstein's field equations with a background source term that induces perturbations and the applications of this new formalism to a compact dense matter relativistic star are presented. We introduce a new response kernel in the field equations between the metric and fluid perturbations. A source term which drives or induces the sub-hydro mesoscopic scales perturbations in the astrophysical system, is of importance here. Deterministic as well as stochastic perturbations for the radial case are worked out as solutions of field equations. We also touch upon polar perturbations that are deterministic with oscillatory parts. The stochastic perturbation are of significance in terms of two point or point separated correlations which form the building blocks for studying equilibrium and non-equilibrium statistical mechanics for the system. Our main aim is to build a theory for intermediate scale physics, for dense exotic matter and investigate structure of the compact astrophysical objects. Specifically, turbulence which connects various scales in superfluid matter in the dense stars is an area gaining importance. The work presented here is the starting point for new theoretical frame work that touches upon various yet unexplored scales where mechanical and dynamical effects interior to the matter of the star are of significance. Thus there is scope for extending studies in asteroseismology to mesoscopic effects at the new intermediate scales in the cold dense matter fluid . This is expected to enable us to probe astrophysical features at refined scales through theoretical formulations as well as for observational consequences.