Orateur
Description
In minimal models of the QCD axion that aim to solve the strong CP problem the axion decay constant is constrained to be above O(10^9) GeV due to astrophysical constraints from the observation of the neutrino burst in SN1987A and the cooling of neutron stars. Such large values of the axion decay constant exclude a possibility to discover axions in near-future helioscopes such as IAXO and do not allow to explain the observed baryon asymmetry via minimal axiogenesis. I will present models of so-called astrophobic QCD axion in which astrophysical constraints are relaxed and allow for the axion decay constant as small as O(10^7) GeV. I will discuss implications of such models for axion dark matter and axiogenesis and possible cosmological and experimental probes of astrophobic axions.
