Virginia TechDavoudiasl, H.Huber, Patrick2013-12-182013-12-182009-05Davoudiasl, Hooman ; Huber, Patrick, MAY 2009. “Thermal production of axions in the Earth,” PHYSICAL REVIEW D 79(9): 095024. DOI: 10.1103/PhysRevD.79.0950241550-7998http://hdl.handle.net/10919/24742We estimate the production rate of axion-type particles in the core of the Earth, at a temperature T approximate to 5000 K. We constrain thermal geo-axion emission by demanding a core-cooling rate less than O(100) K/Gyr, as suggested by geophysics. This yields a "nonstellar" (unaffected by extreme stellar temperatures or densities) bound on the axion-electron (ae) fine structure constant, alpha(ae)less than or similar to 10(-18), stronger than the existing accelerator (vacuum) bound by 4 orders of magnitude. We consider the prospects for measuring the geo-axion flux through conversion into photons in a geoscope; such measurements can further constrain alpha(ae).en-USIn Copyrightinvisible axioncp conservationconstraintsmantlecoreAstronomy & AstrophysicsPhysicsArticle - RefereedAmerican Physical Societyhttp://link.aps.org/doi/10.1103/PhysRevD.79.095024https://doi.org/10.1103/PhysRevD.79.095024