Red Giant evolution in Modified Gravity

محّمد تقی میرترابی (دانشکده فیزیک و شیمی  دانشگاه الزهرا )

Abstract : In this talk we study the static chameleon profile in in homogeneous density distributions and find that the fifth force is weaker from what expected in homogeneous densities. Also, we check the validity of quasi-static approximation for the chameleon scalar field in the astrophysical time scales. We have investigated the rolling down behavior of the scalar field on its effective potential inside a one solar mass red giant star by using MESA code. We have found that the scalar field is fast enough to follow the minimum of the potential. This adiabatic behavior reduces the fifth force and extends the screened regions to lower densities where the field has smaller mass and was expected to be unscreened. As a consequence the star evolution is similar to what expected from standard general relativity.

 یکشنبه 16 اردیبهشت 1397، ساعت 15:00

دانشکده فیزیک، طبقه اول کلاس فیزیک 3