Speaker
Christopher Gerlach
(Johannes Gutenberg-Universität Mainz)
Description
We present the audible axion mechanism extended by a period of supercooling that delays the onset of axion oscillations.
While the original setup relies on a large axion decay constant and coupling to a dark Abelian gauge field to produce sizable gravitational wave signals, in this talk we discuss how supercooling opens up the testable parameter space and reduces the required coupling to $\alpha \gtrsim 1$.
We further showcase that the emission of gravitational waves via the axion coupling to the Standard Model photon becomes possible, generating a strong signal in the $\mu$Hz or ultra-high frequency range. The main limitation for this scenario results from Schwinger pair production.
Primary authors
Christopher Gerlach
(Johannes Gutenberg-Universität Mainz)
Daniel Schmitt
(Goethe Universität Frankfurt am Main)
Pedro Schwaller
(Johannes Gutenberg-Universität Mainz)
