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SUMMARY:TROBADA: Eavesdropping on the Dark Sound of the Universe
DTSTART;VALUE=DATE-TIME:20140219T140000Z
DTEND;VALUE=DATE-TIME:20140219T150000Z
DTSTAMP;VALUE=DATE-TIME:20261020T113139Z
UID:indico-event-2081@indico.ific.uv.es
DESCRIPTION:\n    If all or a fraction of the dark matter (DM) were couple
 d to a bath of dark radiation (DR) in the early Universe we expect the com
 bined DM-DR system to give rise to sound waves propagating throughout the 
 cosmos until DM decouples from the DR.  Much like the standard baryon aco
 ustic oscillations\, these dark acoustic oscillations (DAO) imprint a char
 acteristic scale\, the sound horizon of dark matter\, in the matter densit
 y field. We review how the microphysics of the DM-DR interaction affects t
 he clustering of matter in the Universe and show that the DAO physics also
  gives rise to unique signatures in the temperature and polarization spect
 ra of the cosmic microwave background (CMB).  We use cosmological data fr
 om the CMB\, baryon acoustic oscillations\, and large-scale structure to c
 onstrain the possible fraction of interacting DM as well as the strength o
 f its interaction with DR. Like nearly all knowledge we have gleaned about
  DM since inferring its existence this constraint rests on the betrayal by
  gravity of the location of otherwise invisible DM. We find that linear co
 smological data and CMB lensing put strong constraints on existence of DAO
  features in the CMB and the large-scale structure of the Universe. We als
 o show that our results are surprisingly constraining for the recently pro
 posed Double-disk DM model\, a novel example of how large-scale precision 
 cosmological data can be used to constrain galactic physics and sub-galact
 ic structure. We finally briefly discuss the nonlinear evolution of struct
 ures in the presence of DAO and how one could probe small-scale DAO with g
 ravitational lensing.\n\nhttps://indico.ific.uv.es/event/2081/
LOCATION:IFIC Nave Experimental\, Sala Reuniones
URL:https://indico.ific.uv.es/event/2081/
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