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SUMMARY:Colloquium: Michael Murphy (Swinburne\, Australia)
DTSTART:20221103T133000Z
DTEND:20221103T143000Z
DTSTAMP:20260921T104543Z
UID:www.aip.de-1366
CATEGORIES:Wissenschaftliches
CATEGORIES:Allgemeiner Kalendertermin
CATEGORIES:öffentlich
DESCRIPTION:Fundamental physics with solar twinsThe Standard Model of natu
 re&#x27\;s laws provides no explanation for the fundamental constants\, li
 ke electromagnetism&#x27\;s strength\, alpha. It is therefore up to experi
 ments to test whether fundamental constants are\, indeed\, constant and un
 iversal\, or instead vary and depend on other physical parameters. I will 
 describe a new probe of alpha&#x27\;s constancy within our Galaxy\, solar 
 twin stars\, and show our first results which have an ensemble precision o
 f 12 parts-per-billion. This is already the best astronomical measurement 
 of any fundamental constant so far. The results derive from archival high-
 resolution optical spectra (HARPS) from the ESO 3.6-m telescope\, so there
  is considerable scope for extending them using larger facilities. Our goa
 l is to map alpha across the Milky Way and\, importantly\, its widely-vary
 ing dark matter density field. This will be a completely new\, direct test
  of physics beyond the Standard Model. I will report our discovery of the 
 most distant solar twins and analogues\, up to 4kpc closer to the Galactic
  Centre\, as the first step towards that goal\, and outline current and fu
 ture work.\n
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