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Dark matter

Lecture Notes in Physics, ISSN: 1616-6361, Vol: 975, Page: 9-48
2020
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Book Chapter Description

We discuss the phenomenology of dark matter at cosmological and galactic scales. Direct detection experiments like Xenon-1T have ruled out a large swathe of the mass vs. DM-nucleon cross-section parameter space challenging the conventional WIMP paradigm of the ∼100 GeV weakly interacting dark matter. New mechanisms for relic density like the freeze-in production of dark matter or the 3 → 2 annihilation process can give the correct relic density. These dark matter particles have very small couplings to standard model particles and lower (∼ MeV) mass therefore they can evade the stringent constraints from direct detection experiments. Dark matter can be self interacting thereby solving some problems with cold dark matter at galactic scales. Dark matter may be very light with mass 10 eV or they may be inelastic.

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