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Axion-neutrino interactions in seesaw models and astrophysical probes

P. Kivokurtseva

Abstract

We study axion-neutrino interactions in neutrino-mass extensions of the Standard Model, focusing on the Type-I and inverse seesaw. In these frameworks the effective coupling $g_{aν}$ is tied to the axion scale and can be constrained using existing astrophysical limits on axion couplings to electrons. We then estimate the impact of axion-mediated scattering on neutrino propagation in two benchmarks: resonant interactions with the C$ν$B and scattering on axion dark matter. In the parameter space allowed by current bounds, the resulting optical depths are extremely small, implying no observable signatures with present sensitivities.

Axion-neutrino interactions in seesaw models and astrophysical probes

Abstract

We study axion-neutrino interactions in neutrino-mass extensions of the Standard Model, focusing on the Type-I and inverse seesaw. In these frameworks the effective coupling is tied to the axion scale and can be constrained using existing astrophysical limits on axion couplings to electrons. We then estimate the impact of axion-mediated scattering on neutrino propagation in two benchmarks: resonant interactions with the CB and scattering on axion dark matter. In the parameter space allowed by current bounds, the resulting optical depths are extremely small, implying no observable signatures with present sensitivities.
Paper Structure (8 sections, 18 equations, 1 figure)

This paper contains 8 sections, 18 equations, 1 figure.

Table of Contents

  1. Introduction
  2. Model overview
  3. Present constraints
  4. Astrophysical scenarios
  5. Time delay
  6. Axion flux
  7. Discussion
  8. Conclusions

Figures (1)

  • Figure 1: Constraints on the axion-electron coupling $g_{ae}$ and the corresponding inferred bounds on the neutrino-axion coupling $g_{a\nu}$ obtained via Eq. \ref{['eq:gae']}. The mass of neutrino is taken $m_{\nu}=0,1 \mathrm{eV}$