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Observable gravitational waves in minimal scotogenic model

Sep 24, 2020, 11:00 AM


Arnab Dasgupta (School of Liberal Arts, Seoul National University of Science and Technology)


We scrutinise the widely studied minimal scotogenic model of dark matter (DM)
and radiative neutrino mass from the requirement of a strong First order electroweak phase
transition (EWPT) and observable gravitational waves at future planned space-based experiments.
The scalar DM scenario is similar to inert scalar doublet extension of the standard model
where a strong ?first-order EWPT favours a portion of the low mass regime of DM which
is disfavoured by the latest direct detection bounds. In the fermion DM scenario, we get
newer region of parameter space which favours strong ?rst order EWPT as the restriction
on mass ordering within inert scalar doublet gets relaxed. While such leptophilic fermion
DM remains safe from stringent direct detection bounds, newly allowed low mass regime
of charged scalar can leave tantalising signatures at colliders and can also induce charged
flavour violation within reach of future experiments. While we get such new region of
parameter space satisfying DM relic, strong ?first-order EWPT with detectable gravitational
waves, light neutrino mass and other relevant constraints, we also improve upon previous
analysis in a similar model by incorporating appropriate resummation e?acts in e?ective ?nite
temperature potential.

Primary authors

Arnab Dasgupta (School of Liberal Arts, Seoul National University of Science and Technology) Debasish Borah (Indian Institute of Technology Guwahati) Mr Devabrat Mahanta (Indian Institute of Technology, Guwahati) Kohei Fujikura Sin Kyu Kang (Seoul-Tech)

Presentation materials