Gravitational Wave Probes of Physics Beyond Standard Model 4

Supercooled Audible Axions

Not scheduled

20m

Faculty of Physics, University of Warsaw

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 $\alpha \gtrsim 1$.
Added to that, we showcase that the emission of gravitational waves via the axion coupling to the Standard Model photon in the presence of Schwinger pair production becomes possible, generating a strong signal in the $\mu$Hz or ultra-high frequency range.