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SUMMARY:A Systematic Approach to Axion Production at Finite Density
DTSTART:20260211T010000Z
DTEND:20260211T020000Z
DTSTAMP:20260415T195400Z
UID:indico-event-2768@indico.phys.hawaii.edu
DESCRIPTION:Speakers: Michael Stadbauer (Max Planck Institute for Physics/
 Technical University of Munich (TUM))\n\nAs an elegant solution to the str
 ong CP problem and promising dark matter candidate\, the QCD axion is one 
 of the best motivated particles beyond the SM. On the phenomenological sid
 e\, it is extremely predictive as all its couplings to SM particles\, as w
 ell as its mass\, are determined by a single scale\, the axion decay const
 ant. The hunt for the QCD axion\, both with terrestrial experiments as wel
 l as astrophysical observables\, has exploded in recent years. As of today
 \, astrophysical observations\, such as neutron star cooling and energy lo
 ss from supernovae\, place the strongest bounds. \nIn this talk\, I will 
 show that astrophysical bounds depend on a non-trivial momentum dependence
  of the axion-nucleon production in zero- as well as in finite density env
 ironments. This dependence is induced by one-loop corrections that can be 
 systematically calculated within the framework of chiral perturbation theo
 ry\, both at zero density and in thermal field theory. As a consequence\, 
 the supernova bound is strengthened and the momentum dependence further al
 lows us to constrain large parts of parameter space of the axion neutron c
 oupling. I will talk about the current status of this systematic calculati
 on systematically in chiral perturbation theory and elaborate how our find
 ings compare to more phenomenological approaches in literature. Additional
 ly\, I will talk about the model independent axion production mechanism in
  supernova\, leading to an orders of magnitude stricter bound than in curr
 ent literature.\n\nhttps://indico.phys.hawaii.edu/event/2768/
LOCATION:Room 112 (Watanabe Hall)
URL:https://indico.phys.hawaii.edu/event/2768/
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