Dark Matter Subhalos Gravitational Dynamics and Evolution

Sammanfattning: In this thesis, I present a case where Dark Matter subhalos would annihilate at some stage in their lifetime. The implication of this scenario could potentially aid the Missing Satellites and the Cusp-Core density profile problem. The Dark Matter particles’ annihilation process and effective “friction” lead to an energy and momentum loss into radiation and hence to the destabilization of the Dark Matter subhalo with subsequent collapse and total annihilation. Expected possible observational signa- ture of this effect is a multi-GeV gamma-ray burst, which is potentially observable by high-energy gamma-ray detectors such as FERMI etc. The basic purpose here is to develop a simple analytic model for the collapse dynamics of such a subhalo. I present results that show how the particle departure rate of a given subhalo does not depend on initial parameters such as initial contraction velocity, the initial radius and the initial mass of a given subhalo. Only does it depend on fundamental constants and Dark Matter model parameters, namely its mass and couplings to ordinary mat- ter particles in the Standard Model. This remarkable result potentially allows one to distinguish a whole class of catastrophic astrophysical events with universal characteristics independent on the formation history of such objects. These characteristics could then be used as constraints for the above-mentioned fundamental constants for a given Dark Matter model.