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SUMMARY:Mapping the ALPs: A Naturalness Map for Axions and ALPs
DTSTART;VALUE=DATE-TIME:20261108T063000Z
DTEND;VALUE=DATE-TIME:20261108T070000Z
DTSTAMP;VALUE=DATE-TIME:20261023T121201Z
UID:indico-contribution-2947@indico.itp.ac.cn
DESCRIPTION:Speakers: Andrew Fowlie (XJTLU)\nThe axion solution to the str
 ong CP problem is only as robust as the Peccei-Quinn symmetry it relies on
 \, and quantum gravity is expected to break it. We quantify the resulting 
 axion quality problem using principled measures of fine-tuning\, and show 
 that the cost is severe. For the QCD axion to account for the observed dar
 k matter\, Planck-suppressed symmetry-breaking operators must be absent up
  to mass dimension $d \\ge 12$\; the naturalness penalty for failing to re
 alize this protection can exceed a Bayes factor of $10^{10}$. Extending th
 e analysis to generic axion-like particles\, we map the axion mass-decay c
 onstant plane by the degree of UV protection required\, and find that larg
 e portions of the sensitivity reach of laboratory experiments are already 
 fine-tuned at the part-per-million level or worse. We argue that quality\,
  not mass\, is the central naturalness question for the axion program.\n\n
 https://indico.itp.ac.cn/event/417/contributions/2947/
LOCATION:
URL:https://indico.itp.ac.cn/event/417/contributions/2947/
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