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  • Letter
  • Open Access

Probing flavored regimes of leptogenesis with gravitational waves from cosmic strings

Marco Chianese1,2,*, Satyabrata Datta3,†, Gennaro Miele1,2,4,‡, Rome Samanta4,2,§, and Ninetta Saviano2,4,∥

  • *Contact author: marco.chianese@unina.it
  • †Contact author: amisatyabrata703@gmail.com
  • ‡Contact author: miele@na.infn.it
  • §Contact author: samanta@na.infn.it
  • ∥Contact author: nsaviano@na.infn.it
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Phys. Rev. D 111, L041305 – Published 12 February, 2025

DOI: https://doi.org/10.1103/PhysRevD.111.L041305

Abstract

Cosmic strings radiate detectable gravitational waves in models featuring high-scale symmetry breaking, e.g., high-scale leptogenesis. In this Letter, for the first time, we show that different flavored regimes of high-scale leptogenesis can be tested with the spectral features in cosmic string-radiated gravitational waves. This is possible if the scalar field that makes right-handed neutrinos massive is feebly coupled to the Standard Model Higgs. Each flavored regime, sensitive to low-energy neutrino experiments, leaves a marked imprint on the gravitational waves spectrum. A three-flavor and a two-flavor regime could be probed by a characteristic fall-off of the gravitational wave spectrum at the LISA-DECIGO-ET frequency bands with preceding scale-invariant amplitudes bounded from above and below. We present gravitational waves windows for flavored regimes of leptogenesis testable in the upcoming experiments. We also provide the first construction of a leptogenesis framework where a testable distinction of flavor regimes is possible without constraining the flavor structure of the theory.

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Phys. Rev. D 111, L041305– Published 12 February, 2025
  • Received 19 July 2024
  • Revised 10 November 2024
  • Accepted 27 January 2025
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