Physics PAN Seminar by Dr. Maíra Dutra (Carleton University (Canada))

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Date: October 22, 2021
Time: 3:30 p.m. - 4:30 p.m.
Location: Virtual event
Category: Seminar

Physics PAN Seminar by Dr. Maíra Dutra (Carleton University (Canada))

 Title: Testable portal models of FIMP dark matter

Abstract: Dark matter particles can interact so weakly with the standard
model fields that they may never have reached thermal equilibrium in the
early universe. The relic density of such feebly interacting massive
particles (FIMPs) is produced via the so-called freeze-in mechanism.
This possibility can explain why we have not yet detected dark matter
but is also appealing from a theoretical perspective since tiny
couplings might be a consequence of heavy particles needed to solve
different puzzles in particle physics. In this talk, I will present two
testable models of FIMP dark matter. The first model is a neutrino
portal where three right-handed heavy neutrinos participate in the
type-I seesaw mechanism while mediating interactions between the visible
and dark sectors. If a sufficiently long early matter-dominated period
occurred during the freeze-in process, FIMP self-annihilation becomes
testable by indirect detection experiments. The second model is a Z'
portal in which the SM fermions and a fermionic dark matter candidate
are both charged under a new U(1) symmetry. Remarkably, the rich
phenomenology of Z' bosons is currently constraining regions of the Z'
parameter space in which the dark matter relic density is achieved via


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October 2021