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  • Letter
  • Open Access

Fingerprints of GeV scale right-handed neutrinos on inflationary gravitational waves and PTA data

Satyabrata Datta1,2,* and Rome Samanta3,†

  • 1Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India
  • 2Homi Bhabha National Institute, Second floor, BARC Training School Complex, Anushaktinagar, Mumbai, Maharashtra 400094, India
  • 3CEICO, Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague 8, Czech Republic

  • *satyabrata.datta@saha.ac.in
  • †romesamanta@gmail.com
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Phys. Rev. D 108, L091706 – Published 30 November, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L091706

Abstract

We show that the seesaw mechanisms that exhibit right-handed neutrino mass-dependent nonstandard postinflationary cosmology make blue-tilted inflationary gravitational waves (GWs) compatible with the recent findings of nanohertz stochastic GW background by the pulsar-timing arrays (PTAs) for high reheating temperatures. The right-handed neutrino (RHN) mass scale has to be O(GeV). Remarkably, such a scenario produces a correlated signature testable by the future LIGO run. In addition to contributing to the active neutrino masses, O(GeV) RHNs generate baryon asymmetry of the Universe via low scale leptogenesis. They can be searched for in collider experiments. Therefore, the recent detection by PTAs is not only exciting for GWs in the nanohertz range, it paves the way to test and constrain well-studied mechanisms, such as seesaws, with a low frequency and a correlated measurement of high-frequency GW spectral features, complementary to particle physics searches.

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Phys. Rev. D 108, L091706– Published 30 November, 2023
  • Received 29 August 2023
  • Accepted 2 November 2023
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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.

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