Article (Scientific journals)
Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles
Payez, Alexandre; Evoli, Carmelo; Fischer, Tobias et al.
2015In Journal of Cosmology and Astroparticle Physics, 2015 (02), p. 006
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Keywords :
axion-like particle; supernova; gamma-ray; galactic magnetic field
Abstract :
[en] We revise the bound from the supernova SN1987A on the coupling of ultralight axion-like particles (ALPs) to photons. In a core-collapse supernova, ALPs would be emitted via the Primakoff process, and eventually convert into gamma rays in the magnetic field of the Milky Way. The lack of a gamma-ray signal in the GRS instrument of the SMM satellite in coincidence with the observation of the neutrinos emitted from SN1987A therefore provides a strong bound on their coupling to photons. Due to the large uncertainty associated with the current bound, we revise this argument, based on state-of-the-art physical inputs both for the supernova models and for the Milky-Way magnetic field. Furthermore, we provide major amendments, such as the consistent treatment of nucleon-degeneracy effects and of the reduction of the nuclear masses in the hot and dense nuclear medium of the supernova. With these improvements, we obtain a new upper limit on the photon-ALP coupling: g_{a\gamma} < 5.3 x 10^{-12} GeV^{-1}, for m_a < 4.4 x 10^{-10} eV, and we also give its dependence at larger ALP masses. Moreover, we discuss how much the Fermi-LAT satellite experiment could improve this bound, should a close-enough supernova explode in the near future.
Disciplines :
Physics
Space science, astronomy & astrophysics
Author, co-author :
Payez, Alexandre ;  Deutsches Elektronen-Synchrotron (DESY) > Theory group
Evoli, Carmelo;  Hamburg University > II. Institute for Theoretical Physics
Fischer, Tobias;  University of Wroclaw > Institute for Theoretical Physics
Giannotti, Maurizio;  Barry University > Physical Sciences
Mirizzi, Alessandro;  Hamburg University > II. Institute for Theoretical Physics
Ringwald, Andreas;  Deutsches Elektronen-Synchrotron (DESY) > Theory group
Language :
English
Title :
Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles
Publication date :
06 February 2015
Journal title :
Journal of Cosmology and Astroparticle Physics
eISSN :
1475-7516
Publisher :
Institute of Physics Publishing (IOP), Bristol, United Kingdom
Volume :
2015
Issue :
02
Pages :
006
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 January 2015

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