Fresh look at axions and SN 1987A | Zendy

W. Keil | Zendy; HansThomas Janka | Zendy; David N. Schramm | Zendy; G. Sigl | Zendy; Michael S. Turner | Zendy; John Ellis | Zendy

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Fresh look at axions and SN 1987A

Author(s) -

W. Keil,

HansThomas Janka,

David N. Schramm,

G. Sigl,

Michael S. Turner,

John Ellis

Publication year - 1997

Publication title -

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Language(s) - English

Resource type - Journals

eISSN - 1089-4918

pISSN - 0556-2821

DOI - 10.1103/physrevd.56.2419

Subject(s) - axion , physics , nucleon , pion , neutrino , particle physics , saturation (graph theory) , limit (mathematics) , nuclear physics , dark matter , mathematical analysis , mathematics , combinatorics

We re-examine the very stringent limits on the axion mass based on the strength and duration of the neutrino signal from SN 1987A, in the light of new measurements of the axial-vector coupling strength of nucleons, possible suppression of axion emission due to many-body effects, and additional emission processes involving pions. The suppression of axion emission due to nucleon spin fluctuations induced by many-body effects degrades previous limits by a factor of about 2. Emission processes involving thermal pions can strengthen the limits by a factor of 3-4 within a perturbative treatment that neglects saturation of nucleon spin fluctuations. Inclusion of saturation effects, however, tends to make the limits less dependent on pion abundances. The resulting axion mass limit also depends on the precise couplings of the axion and ranges from 0.5x10**(-3) eV to 6x10**(-3) eV

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