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May 8 – 10, 2023
University of Pittsburgh
US/Eastern timezone

FIMP Dark matter from Flavor models

May 8, 2023, 5:15 PM
15m
Lawrence Hall 104

Lawrence Hall 104

BSM BSM IV

Speaker

Shreyashi Chakdar

Description

We investigate the phenomenology of a non-thermal dark matter (DM) in the context of flavor models that explain the hierarchy in the masses and mixings of quarks and leptons via the Froggatt-Nielsen (FN) mechanism. A flavor-dependent $U(1)_{FN}$ symmetry explains the fermion mass and mixing hierarchy, and also provides a mechanism for suppressed interactions of the DM, assumed to be a Majorana fermion, with the Standard Model (SM) particles, resulting in its FIMP (feebly interacting massive particle) character. Such feeble interactions are mediated by a flavon field through higher dimensional operators governed by the $U(1)_{FN}$ charges. We point out a natural stabilizing mechanism for the DM within this framework with the choice of half-integer charge for the DM fermion and integer charges for the SM fermions and the flavon field. In this scenario, the DM is non-thermally produced from the decay of the flavon in the early universe, and becomes a relic through the freeze-in mechanism. We explore the allowed parameter space for this DM candidate from relic abundance by solving the relevant Boltzmann equations. We find that there is some preference for sub-MeV range for the DM mass since the experimental and theoretical constraints are less stringent in this range.

Primary authors

Dr Dilip Ghosh (IACS) Dr Kaladi Babu (Oklahoma State University) Ms Nandini Das (IACS) Purusottam Ghosh (IACS) Shreyashi Chakdar

Presentation materials