APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Marcin Badziak (University of Warsaw)
Title: Signatures of astrophobic QCD axion
Date (JST): Wed, Jun 26, 2024, 13:30 - 15:00
Place: Seminar Room A
Abstract: 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.