Induced polar perturbations in relativistic stars with stochastic effects in the dense matter at sub-hydro mesoscopic scales: A theoretical probe at intermediate length scales

Abstract

A linear response relation between metric and fluid perturbations driven by a background noise source is used as a framework for obtaining non-radial polar perturbations in dense matter relativistic stars. The perturbations carry a generalized stochastic nature as solutions to the classical Einstein-Langevin equation which has been recently proposed. The significance of these stochastic non-radial polar perturbations lies at probing the intermediate sub-hydro scales inside the dense fluid. This study extends towards a non-equilibrium/near-equilibrium statistical mechanics study for relativistic star interiors. We address the non-radial polar perturbations in stars which are important from the point of view of detection in future. A generalized stochastic noise which originates as the remnant of collapse mechanism in isolated star is expected to give rise to such stochastic polar perturbations at intermediate sub-hydro scales. More specifically it is the interplay between the degeneracy pressure of exotic matter and the gravitational pressure that gives rise to the seeds of stochastic effects or noise in the background of the gravitating body towards the near-equilibrium configuration.