Time-Dependent Solution for a Star Immersed in a Background Radiation

TL;DR

This paper presents a time-dependent, spherically symmetric solution modeling a contracting star immersed in background radiation, with implications for understanding stellar environments and potential experimental tests.

Contribution

It introduces a novel time-dependent solution for a star in a radiation background, extending previous static models and analyzing its applicability in the solar system.

Findings

The solution models a contracting star with decreasing temperature.

The approximate solution is valid within a wide range in the solar system.

Possible experimental tests of the model are discussed.

Abstract

We study a time-dependent and spherically-symmetric solution with a star-like source. We show that this solution can be interpreted as an exterior solution of a contracting star which has a decreasing temperature and is immersed in a homogenous and isotropic background radiation. Distribution of the temperature in the fields and close-to Schwarzschild approximation of the solution are studied. By identifying the radiation with the cosmic background one, we find that the close-to-Schwarzschild approximate solution is valid in a wide range in our solar system. Possible experimental tests of the solution are discussed briefly.