Red giant bound on the axion-electron coupling reexamined
| dc.creator | Raffelt, G. | |
| dc.creator | Weiss, A. | |
| dc.date | 1994-10-03 | |
| dc.date.accessioned | 2026-07-07T10:35:06Z | |
| dc.date.available | 2026-07-07T10:35:06Z | |
| dc.description | If axions or other low-mass pseudoscalars couple to electrons (``fine structure constant'' $α_a$) they are emitted from red giant stars by the Compton process $γ+e\to e+a$ and by bremsstrahlung $e+(Z,A)\to (Z,A)+e+a$. We construct a simple analytic expression for the energy-loss rate for all conditions relevant for a red giant and include axion losses in evolutionary calculations from the main sequence to the helium flash. We find that $α_a\lapprox0.5\mn(-26)$ or $m_a\lapprox 9\,\meV/\cos^2β$ lest the red giant core at helium ignition exceed its standard mass by more than $0.025\,\MM_\odot$, in conflict with observational evidence. Our bound is the most restrictive limit on $α_a$, but it does not exclude the possibility that axion emission contributes significantly to the cooling of ZZ~Ceti stars such as G117--B15A for which the period decrease was recently measured. | |
| dc.description | 11 pages, uuencoded and compressed postscript file | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9410205 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9410205 | |
| dc.identifier | Phys.Rev.D51:1495-1498,1995 | |
| dc.identifier | doi:10.1103/PhysRevD.51.1495 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/179652 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Red giant bound on the axion-electron coupling reexamined | |
| dc.type | text |