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SUMMARY:Phenomenology of axion-gauge field interactions in the early unive
 rse - Alexandros Papageorgiou (IFT\, Madrid)
DTSTART:20240528T120000Z
DTEND:20240528T130000Z
UID:TALK216520@talks.cam.ac.uk
CONTACT:Thomas Colas
DESCRIPTION:In this talk\, I will give a brief overview of my work on the 
 phenomenology of axion-gauge interactions in the early universe. Couplings
  between axion-like particles (ALPs) and gauge fields arise naturally in U
 V-complete theories such as string theory. Moreover\, their phenomenology 
 is rich and potentially within reach of current or future experimental pro
 bes. For the aforementioned reasons there has been a considerable and syst
 ematic effort to uncover the phenomenology of such couplings and I will be
  providing a review of past results with a focus on couplings between axio
 ns and massless U(1) gauge fields as well as SU(2) gauge fields (chromo-na
 tural inflation etc.). In the context of inflation\, these models in parti
 cular produce strong gravitational waves\, potentially observable with cur
 rent of future interferometers or PTA experiments. Additionally\, they pre
 dict strongly sourced scalar perturbations\, scalar induced gravitational 
 waves\, primordial black holes and more. Finally\, I will emphasize a regi
 me of these models which is only recently beginning to be explored\, namel
 y the "strong backreaction" regime and give a detailed breakdown of the un
 ique signatures of such a regime during infllation.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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