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SUMMARY:Primordial black holes: abundances and constraints - Xavier Pritch
 ard\, Sussex
DTSTART:20250321T130000Z
DTEND:20250321T140000Z
UID:TALK228772@talks.cam.ac.uk
CONTACT:Xi Tong
DESCRIPTION:The equation of state of the primordial plasma is reduced duri
 ng each early universe phase transition. Primordial black holes\, thought 
 to form whilst the universe is radiation dominated\, are exponentially sen
 sitive to the changes in the equation of state. However\, this exponential
  sensitivity is the same that primordial black hole formation shows to the
  amplitude of the primordial curvature power spectrum. Thus\, using constr
 aints on the power spectrum we are able to place constraints on primordial
  black hole abundances. I will show that\, despite the exponential enhance
 ment in formation rate\, current constraints on the power spectrum lead to
  difficulties motivating primordial black holes with the standard model ph
 ase transitions.
LOCATION:Potter room / https://cam-ac-uk.zoom.us/j/87235967698
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