• Open Access

Freeze-in dark matter via a light Dirac neutrino portal

Anirban Biswas, Debasish Borah, Nayan Das, and Dibyendu Nanda
Phys. Rev. D 107, 015015 – Published 17 January 2023

Abstract

We propose a scenario where dark matter (DM) can be generated nonthermally due to the presence of a light Dirac neutrino portal between the standard model (SM) and dark sector particles. The SM is minimally extended by three right-handed neutrinos (νR), a Dirac fermion DM candidate (ψ) and a complex scalar (ϕ), transforming nontrivially under an unbroken Z4 symmetry while being singlets under the SM gauge group. While DM and νR couplings are considered to be tiny in order to be in the nonthermal or freeze-in regime, ϕ can be produced either thermally or nonthermally depending upon the strength of its Higgs portal coupling. We consider both these possibilities and find out the resulting DM abundance via freeze-in mechanism to constrain the model parameters in the light of Planck 2018 data. Since the interactions producing DM also produce relativistic νR, we check the enhanced contribution to the effective relativistic degrees of freedom ΔNeff in view of existing bounds as well as future sensitivities. We also check the stringent constraints on free-streaming length of such freeze-in DM from structure formation requirements. Such constraints can rule out DM mass all the way up to O(100keV) keeping the ΔNeffO(103) out of reach from near future experiments. Possible extensions of this minimal model can lead to observable ΔNeff which can be probed at next generation experiments.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
3 More
  • Received 28 September 2022
  • Accepted 3 January 2023

DOI:https://doi.org/10.1103/PhysRevD.107.015015

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Particles & Fields

Authors & Affiliations

Anirban Biswas1,2,*, Debasish Borah3,†, Nayan Das3,‡, and Dibyendu Nanda4,5,§

  • 1Department of Physics, Sogang University, Seoul 121-742, South Korea
  • 2Center for Quantum Spacetime, Sogang University, Seoul 121-742, South Korea
  • 3Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India
  • 4School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Kolkata 700032, India
  • 5School of Physics, Korea Institute for Advanced Study, Seoul 02455, Korea

  • *anirban.biswas.sinp@gmail.com
  • dborah@iitg.ac.in
  • nayan.das@iitg.ac.in
  • §dnanda@kias.re.kr

Article Text

Click to Expand

References

Click to Expand
Issue

Vol. 107, Iss. 1 — 1 January 2023

Reuse & Permissions
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

×

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×