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SUMMARY:IFIC Seminar: Not-quite-primordial black holes
DTSTART;VALUE=DATE-TIME:20251014T100000Z
DTEND;VALUE=DATE-TIME:20251014T110000Z
DTSTAMP;VALUE=DATE-TIME:20260714T213207Z
UID:indico-event-8219@indico.ific.uv.es
DESCRIPTION:In this talk\, I will discuss a new mechanism for the formatio
 n of seeds of supermassive black holes at early cosmic epochs. Enhanced de
 nsity fluctuations with amplitudes that are not large enough to form primo
 rdial black holes post-inflation can still lead to collapsed dark matter h
 alos at very early times. For halos forming prior to 1+z ~ 200\, the Cosmi
 c Microwave Background (CMB) is energetic enough to suppress the formation
  of molecular hydrogen\, hence preventing cooling and fragmentation\, as a
  consequence of which baryons falling into the potential well of the halo 
 may undergo “direct collapse" into a black hole. I will show using a few
  illustrative models how this mechanism may account for the abundance of h
 igh-redshift black holes inferred from observations by the James Webb Spac
 e Telescope while remaining consistent with current limits from CMB spectr
 al distortions. Limits on the primordial power spectrum are also derived b
 y requiring that the universe not reionize too early.\n\nhttps://indico.if
 ic.uv.es/event/8219/
LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario
URL:https://indico.ific.uv.es/event/8219/
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