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We consider a scenario where light active neutrinos are of Dirac nature and their right chiral parts act as a portal between the standard model and dark matter (DM). Depending upon this portal coupling, DM can either be in thermal or non-thermal ballpark. A gauged \(U(1)_{B-L}\) symmetry accommodates right chiral parts of Dirac neutrinos naturally and ensures DM stability. Due to portal and \(U(1)_{B-L}\) interactions, it is possible to have additional relativistic degrees of freedom in the form of light Dirac neutrinos which can be probed by cosmic microwave background measurements of \(\varDelta N_\textrm{eff}\) . The parameter space also remains within reach of terrestrial experiments like collider.

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Cosmological Signatures of Dirac Neutrino Portal Dark Matter

  • 会议论文

  • 发表日期：

    2025年

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  • Nayan Das,
  • Debasish Borah

摘要

We consider a scenario where light active neutrinos are of Dirac nature and their right chiral parts act as a portal between the standard model and dark matter (DM). Depending upon this portal coupling, DM can either be in thermal or non-thermal ballpark. A gauged \(U(1)_{B-L}\) symmetry accommodates right chiral parts of Dirac neutrinos naturally and ensures DM stability. Due to portal and \(U(1)_{B-L}\) interactions, it is possible to have additional relativistic degrees of freedom in the form of light Dirac neutrinos which can be probed by cosmic microwave background measurements of \(\varDelta N_\textrm{eff}\) . The parameter space also remains within reach of terrestrial experiments like collider.