21–24 Sept 2021
DESY Hamburg
Europe/Berlin timezone

Supernova bounds on axion-like particles coupled with nucleons and electrons

22 Sept 2021, 14:15
15m
Main Auditorium

Main Auditorium

Cosmology & Astroparticle Physics Parallel Sessions: Cosmology

Speaker

Giuseppe Lucente (University of Bari, INFN Bari)

Description

We investigate the potential of type II supernovae (SNe) to constrain axion-like particles (ALPs) coupled simultaneously to nucleons and electrons. ALPs coupled to nucleons can be efficiently produced in the SN core via nucleon-nucleon bremsstrahlung and, for a wide range of parameters, leave the SN unhindered, producing a large ALP flux.
For masses exceeding 1 MeV, these ALPs would decay into electron-positron pairs, generating a positron flux. In the case of Galactic SNe, the annihilation of the created positrons with the electrons present in the Galaxy would contribute to the 511 keV annihilation line. Using the SPI (SPectrometer on INTEGRAL) observation of this line, allows us to exclude a wide range of the axion-electron coupling, $10^{-19} < g_{ae} < 10^{-11}$, for $g_{ap}\sim 10^{-9}$. Additionally, ALPs from extra-galactic SNe decaying into electron-positron pairs would yield a contribution to the cosmic X-ray background. In this case, we constrain the ALP-electron coupling down to $g_{ae} \sim 10^{-20}$.

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Primary authors

Giuseppe Lucente (University of Bari, INFN Bari) Pierluca Carenza (Università degli Studi di Bari) Francesca Calore (CNRS, LAPTh) Prof. Maurizio Giannotti (Barry University) Prof. Jaeckel Joerg (Institut fur theoretische Physik, Universitat Heidelberg) Alessandro Mirizzi (University of Bari)

Presentation materials