Department of Physics

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Author: search.filters.author.Mondal, TanmoySubject: search.filters.subject.Dark matter (DM)

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    Constraining minimal 𝑈��⁢(1)𝐵��−𝐿�� model from dark matter observations
    (APS, 2014-03) Mondal, Tanmoy
    We study the 𝐵−𝐿 gauge extension of the Standard Model which contains a singlet scalar and three right-handed neutrinos. The vacuum expectation value of the singlet scalar breaks the 𝑈⁢(1)𝐵−𝐿 symmetry. Here the third-generation right-handed neutrino is qualified as the dark matter candidate, as an artifact of 𝑍2-charge assignment. Relic abundance of the dark matter is consistent with WMAP9 and PLANCK data, only near scalar resonances where dark matter mass is almost half of the scalar boson masses. Requiring correct relic abundance, we restrict the parameter space of the scalar mixing angle and mass of the heavy scalar boson of this model. Besides this, the maximum value of the spin-independent scattering cross section off nucleon is well below the Xenon100 and recent LUX exclusion limits and can be probed by future Xenon1T experiments. In addition, we compute the annihilation of the dark matter into a two-photon final state in detail and compare with the Fermi-LAT upper bound on ⟨𝜎⁢𝑣⟩𝛾⁢𝛾 for the NFW and Einasto profile.
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    Models of decaying FIMP Dark Matter: potential links with the Neutrino Sector
    (2020-08) Mondal, Tanmoy
    The absolute stability of a dark matter (DM) particle is not a binding requirement. Here we suggest a few scenarios where the DM particle is liable to decay via extremely feeble interactions. This can happen via inexplicably small Yukawa couplings in the simplest conjectures. After setting down such a model, we go beyond it, thus treading onto scenarios where the spontaneous breakdown of some gauged U(1) symmetry may lead to intermediate scales, and suitably suppressed effective operators which allow the DM particle to decay slowly. The constraints from particle physics as well as cosmology are taken into account in each case. The last and more involved scenario, studied in detail, suggest a link between the model parameters that govern neutrino physics on one side, and the dynamics of a quasi-stable DM particle on the other.