Speaker
Description
Dark Matter particles if accumulated in considerable numbers after being
captured inside a massive astrophysical object such as Galactic Centre,
may undergo the process of self annihilation to produce Standard Model
particles such as fermion-antifermion pairs, gamma rays etc. In case
the annihilation products include electrons then under the influence of
magnetic field present in the Galactic Centre region, these electrons
can emit synchrotron radiation which if detected by the terrestrial
radio telescopes could be a possible indirect signature of Dark Matter.
In the present work we explore such possibilities by proposing a
particle Dark Matter model. In our model, we propose a fermionic Dark Matter
candidate by extending the Standard Model of particle physics with a Dirac
fermion and a real pseudoscalar. The added fermion which is the Dark Matter
candidate interacts with Standard Model via the Higgs portal through a
dimension 5 coupling and also by the pseudoscalar. The coupling parameters
are constrained by the Dark Matter relic density results from PLANCK
experiment and the LHC constraints as also the experimental direct detection
limits. Within the framework of this model we then explore the annihilation
of this Dark Matter to electron-positron at the Galactic Centre and estimate
the synchrotron radiation flux that could be produced. The detectability
of these flux at various presently operating and future radio telescopes
such as SKA, GMRT, Jodrell Bank etc. are then discussed. The results are shown for two Dark Matter density profiles.
