Speaker
Dr
Mrutunjaya Bhuyan
(Institute of Physics, Bhubaneswar)
Description
We investigate how the intrinsic nature of fermionic dark matter (DM),
Dirac versus Majorana, affects the structure of compact stars. Incorporating DM
into a relativistic mean-field framework with a scalar portal coupling to nucleons,
we derive self-consistent equations of state and solve the
Tolman–Oppenheimer–Volkoff equations. Differences in internal degrees of
freedom lead Dirac DM to soften the EoS more than Majorana DM, resulting in
smaller stellar radii and lower maximum masses. By comparing with observational
constraints from NICER and gravitational-wave data, we show that compact star
measurements can provide insights into the particle nature of dark matter.
