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SUMMARY:The TRGB Luminosity as a Probe of the Axion–Electron Coupling: C
 onstraints and Theoretical Uncertainties
DTSTART;VALUE=DATE-TIME:20261030T094500Z
DTEND;VALUE=DATE-TIME:20261030T100000Z
DTSTAMP;VALUE=DATE-TIME:20261104T161009Z
UID:indico-contribution-6205@cern.ch
DESCRIPTION:Speakers: Alexey Kudashov (Moscow State University Faculty of 
 Physics)\nRed-giant evolution is sensitive to non-standard channels of ene
 rgy loss and therefore provides a probe of new physics.\nSuch losses incre
 ase the luminosity of the tip of the red-giant branch\n(TRGB)\, enabling c
 onstraints on the axion--electron coupling $g_{ae}$.\nIn this talk\, we pr
 esent cluster-specific stellar-evolution calculations\nwith MESA for 27 Ga
 lactic globular clusters\, including the implementation\nof axion emission
  and its impact on the predicted TRGB luminosity.\nParticular attention is
  given to the assessment of theoretical uncertainties associated with ther
 mal-neutrino emission\, electron conduction\, radiative opacity\, nuclear 
 reaction rates\, convection\, and other modelling assumptions. We examine 
 how these theoretical uncertainties affect the predicted TRGB luminosities
  and the resulting constraints on the axion–electron coupling.\n\nWe bri
 efly outline the joint profile-likelihood analysis used to\ncompare these 
 predictions with TRGB measurements for 24 clusters\,\nafter excluding thre
 e hot-flasher systems. Retaining shared\nuncertainties as correlated nuisa
 nce parameters\, we obtain\na 95% confidence-level power-constrained upper
  limit\nof $g_{ae} \n\nhttps://indico.particle.mephi.ru/event/626/contribu
 tions/6205/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6205/
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