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We study thermal and non-thermal resonant leptogenesis where a heavy scalar \(\phi \) decays into right-handed neutrinos (RHNs), whose subsequent decay generates the required lepton asymmetry [1]. The domination of \(\phi \) or RHNs alters the evolution of primordial gravitational waves (PGWs), modifying their spectrum. RHNs can reach thermal abundance before decaying, leading to thermal leptogenesis. The decay of \(\phi \) and RHNs releases entropy, causing damping in the GW spectrum with knee-like features, indicative of low-scale leptogenesis. We explore the parameter space for RHN mass \(M_1 \in [10^2, 10^{14}]\) GeV and washout parameter K. These effects are detectable by future GW observatories like LISA and ET.

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Inflationary Gravitational Wave Spectral Shapes as Test for Low-Scale Leptogenesis

  • 会议论文

  • 发表日期：

    2025年

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  • Lekhika Malhotra,
  • Zafri A. Borboruah,
  • Anish Ghoshal,
  • Urjit A. Yajnik

摘要

We study thermal and non-thermal resonant leptogenesis where a heavy scalar \(\phi \) decays into right-handed neutrinos (RHNs), whose subsequent decay generates the required lepton asymmetry [1]. The domination of \(\phi \) or RHNs alters the evolution of primordial gravitational waves (PGWs), modifying their spectrum. RHNs can reach thermal abundance before decaying, leading to thermal leptogenesis. The decay of \(\phi \) and RHNs releases entropy, causing damping in the GW spectrum with knee-like features, indicative of low-scale leptogenesis. We explore the parameter space for RHN mass \(M_1 \in [10^2, 10^{14}]\) GeV and washout parameter K. These effects are detectable by future GW observatories like LISA and ET.