Boson star at finite temperature

TL;DR

This paper investigates the properties of boson stars at finite temperature, confirming their stability and analyzing how temperature affects their mass and radius using a thermodynamically consistent equation of state.

Contribution

It introduces a thermodynamically consistent equation of state for boson stars and examines the impact of temperature on their maximum mass and size, refining previous models.

Findings

Stable Bose-Einstein condensate stars can form.

Maximum mass is insensitive to temperature changes.

Star radius significantly depends on matter temperature.

Abstract

By using a simple thermodynamical method we confirm the finding of Chavanis and Harko that stable Bose-Einstein condensate stars can form. However, by using a thermodynamically consistent boson equation of state, we obtain a less massive Bose-Einstein condensate star compared to the one predicted by Chavanis and Harko. We also obtain that the maximum mass of a boson star is insensitive to the change of matter temperature. However, the mass of boson star with relatively large radius depends significantly on the temperature of the boson matter.