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SUMMARY:A Physically Reasonable Galactic Potential via Symbolic Regression
  on Gaia DR3
DTSTART:20261022T070000Z
DTEND:20261022T083000Z
DTSTAMP:20261028T233000Z
UID:indico-event-439@indico.kias.re.kr
DESCRIPTION:Speakers: Adam Kamoski (University of Massachusetts\, Boston)\
 n\nTitle: A Physically Reasonable Galactic Potential via Symbolic Regressi
 on on Gaia DR3\nSpeaker: Adam Kamoski \nAbstract: The local dark matter 
 density determines the strength of the signal expected in direct-detection
  experiments\, yet published estimates from stellar motions disagree by mo
 re than their errors\, and the most recent machine-learning analysis of Ga
 ia data finds a local density consistent with zero. According to Jeans' th
 eorem\, a distribution function built from integrals of motion satisfies t
 he collisionless Boltzmann equation (CBE) trivially for any choice of pote
 ntial\, so a search that simultaneously fits the distribution function and
  the potential to the CBE identifies neither. Our pipeline instead estimat
 es the distribution function in isolation\, linearizing the equation in te
 rms of accelerations and allowing for direct measurement of the local forc
 e field\, and then fits closed forms to that field via symbolic regression
 . Throughout\, we find that the usable information lies not in the CBE res
 idual but in the stellar number counts\, the observable most distorted by 
 survey selection. Along the vertical profile\, our recovered potential agr
 ees with the classical self-gravitating isothermal disc.\n \n\n\nhttps://
 indico.kias.re.kr/event/439/
LOCATION:Room 1423 (KIAS)
URL:https://indico.kias.re.kr/event/439/
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