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Axion Emission from Strange Matter in Core-Collapse SNe.

Maël Cavan-Piton1, Diego Guadagnoli1, Micaela Oertel2

  • 1<a href="https://ror.org/010hz2d37">LAPTh</a>, <a href="https://ror.org/04gqg1a07">Université Savoie Mont-Blanc</a> et <a href="https://ror.org/02feahw73">CNRS</a>, 74941 Annecy, France.

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Supernova neutrino burst duration constrains exotic particle cooling. This study quantifies axion cooling from strange matter in supernovae, providing new bounds on axion couplings.

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Area of Science:

  • Astrophysics
  • Particle Physics
  • Nuclear Physics

Background:

  • Supernova neutrino bursts are sensitive to exotic cooling mechanisms.
  • Axions are hypothetical particles that could be produced in dense, hot supernova cores.
  • The role of strange matter in supernovae cooling is not fully understood.

Purpose of the Study:

  • To quantitatively investigate the cooling effects of axions radiated from strange matter in supernovae.
  • To include the full baryon and meson octets in calculations of axion emissivity.
  • To derive new constraints on axion couplings based on supernova observations.

Main Methods:

  • Calculation of axion emissivity from baryon-meson scatterings and baryon decays.
  • Inclusion of diverse supernova thermodynamic conditions and equations of state with varying strangeness content.
  • Analysis of axion-strange-strange and axion-down-strange couplings.

Main Results:

  • First quantitative study of axion cooling from strange matter in supernovae.
  • Derivation of the first bound on the axial axion-strange-strange coupling.
  • Strongest existing bound on the axion-down-strange coupling, potentially as low as O(10^{-2}) for f_a=10^9 GeV.

Conclusions:

  • Strange matter plays a significant role in axion-mediated cooling of supernovae.
  • Observational data from supernova 1987A can effectively constrain axion properties.
  • The study provides stringent limits on fundamental particle physics parameters using astrophysical observations.