BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:The Dark Matter - Phonon Coupling
DTSTART:20190731T100000
DTEND:20190731T110000
DTSTAMP:20260407T130024Z
UID:aab36c12f24e67f8b0ab6d5180ebf90a3fe780a8248623454e2230e1
CATEGORIES:Conferences - Seminars
DESCRIPTION:Tom Melia — The University of Tokyo\nThe experimental endeav
 our to directly detect dark matter in a laboratory on earth must confront 
 a possible dark matter mass range spanning over sixty orders of magnitude.
  Within the lowest mass regions\, the dark matter oscillates as a coherent
  classical field\, which can be leveraged in experiments that search for r
 esonant effects. Conventional WIMP searches\, on the other hand\, rely on 
 the detection of energy deposited in a scattering event. \n\nA particular
 ly challenging window exists for dark matter with keV-MeV mass\, lying abo
 ve the coherence regime\, but below conventional detector thresholds. For 
 such masses\, detectors need to be sensitive to energy deposits between an
  meV and an eV. One promising avenue is to try and detect dark matter via 
 its scattering off phonon vibrations in crystals\, which are natural degre
 es of freedom to absorb such energies.   \n\nI will present a curious fe
 ature of the dark matter-phonon coupling: the leading order scattering off
  optical crystal phonons must precisely vanish in the limit in which the d
 ark matter couples to atoms proportional to their mass. Such a coupling is
  in fact generic\, and I will discuss how a judicious choice of detector m
 aterial can avoid this suppression\, and thus enhance reach.
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR