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We investigate a model connecting the neutrino sector and the dark sector of the universe through a mediator \(\varPhi \) . This model inherits a discrete \(\mathcal {Z}_4\) symmetry, which, upon \(\varPhi \) developing a non-zero vacuum expectation value (VEV) \(v_{\varPhi }\) , reduces to a remnant \(\mathcal {Z}_2\) symmetry, which stabilises the dark matter. Within this framework, the observed baryon asymmetry of the universe obtains additional scattering contributions to the standard vanilla leptogenesis. The symmetry-breaking scale ( \(v_{\varPhi }\) ) links the neutrino and the dark sector, while also relating to the gravitational wave signals generated by domain wall annihilation via explicit \(\mathcal {Z}_4\) breaking, detectable by current and future experiments.

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Connecting Leptogenesis, Dark Matter and Gravitational Waves via Discrete Symmetry Breaking

  • 会议论文

  • 发表日期：

    2025年

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  • Subhaditya Bhattacharya,
  • Niloy Mondal,
  • Rishav Roshan,
  • Drona Vatsyayan

摘要

We investigate a model connecting the neutrino sector and the dark sector of the universe through a mediator \(\varPhi \) . This model inherits a discrete \(\mathcal {Z}_4\) symmetry, which, upon \(\varPhi \) developing a non-zero vacuum expectation value (VEV) \(v_{\varPhi }\) , reduces to a remnant \(\mathcal {Z}_2\) symmetry, which stabilises the dark matter. Within this framework, the observed baryon asymmetry of the universe obtains additional scattering contributions to the standard vanilla leptogenesis. The symmetry-breaking scale ( \(v_{\varPhi }\) ) links the neutrino and the dark sector, while also relating to the gravitational wave signals generated by domain wall annihilation via explicit \(\mathcal {Z}_4\) breaking, detectable by current and future experiments.