TL;DR
This paper estimates the production of axion-like particles in Earth's core and sets a new, stronger bound on their interaction strength, proposing potential detection methods to improve constraints.
Contribution
It provides the first estimate of thermal geo-axion emission and derives a significantly stronger bound on axion-electron coupling than previous accelerator experiments.
Findings
Derived a bound on axion-electron coupling: _a^{QV} < 10^{-18}
Estimated the geo-axion flux from Earth's core conditions
Proposed detection via photon conversion in a geoscope
Abstract
We estimate the production rate of axion-type particles in the core of the Earth, at a temperature T~5000K. We constrain thermal geo-axion emission by demanding a core-cooling rate less than 100K/Gyr, as suggested by geophysics. This yields a "quasi-vacuum" (unaffected by extreme stellar conditions) bound on the axion-electron fine structure constant \alpha_a^{QV} < 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_a^{QV}.
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