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SUMMARY:The dynamic Universe of preferred axion models - Andrew Cheek
DTSTART:20231215T160000Z
DTEND:20231215T170000Z
UID:TALK207376@talks.cam.ac.uk
CONTACT:Luca Mantani
DESCRIPTION:I will talk about the cosmological consequences of the heavy q
 uarks in KSVZ-type axion models.  We find that their presence often causes
  an early matter domination phase\, altering the evolution of the Universe
 . This extends the axion mass into the region where standard cosmology lea
 ds to overproduction\, and allows for a greater number of axion models wit
 h non-renormalizable terms to be viable. This is achieved without resortin
 g to fine-tuning of the initial misalignment angle\, bolstering the motiva
 tion for many future axion haloscope experiments. Additionally\, we explor
 e how these models can be probed through measurements of the number of rel
 ativistic degrees of freedom at recombination.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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