Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-10-18
Astropart.Phys.2:175-186,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pp, 3 PS figures, CERN-TH-7044/93
Scientific paper
10.1016/0927-6505(94)90040-X
Using thermal field theory methods, we recalculate axion emission from dense plasmas. We study in particular the Primakoff and the bremsstrahlung processes. The Primakoff rate is significantly suppressed at high densities, when the electrons become relativistic. However, the bound on the axion-photon coupling, $G<10^{-10}$ GeV, is unaffected, as it is constrained by the evolution of HB stars, which have low densities. In contradistinction, the same relativistic effects enhance the bremsstrahlung processes. From the red giants and white dwarfs evolution, we obtain a conservative bound on the axion-electron coupling, $g_{ae} < 2\times 10^{-13}$.
Altherr Tanguy
Petitgirard Emmanuel
Rio Gaztelurrutia Teresa del
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