Effects of dark matter on interior and evolution of main sequence stars

Abstract

In a region of very high dark matter density such as near the Galactic center, stars may capture a large amount of dark matter. The existence of dark matter in the core of a star may trigger annihilation processes which provide additional source of energy for the star while significantly alters stellar interior and evolution. We employed DarkStars code to simulate the evolution of main sequence stars under the influence of dark matter. Simulations show that energy injection by dark matter annihilation to stars causes decreasing in temperature and pressure in the stellar core. Hence, the rate of hydrogen burning drops. Stars are able to maintain hydrogen in their core for longer period and extend their lifetime in the main sequence. Lower mass stars are influenced more significantly by dark matter than higher mass stars.