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VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20261020T001710Z
LAST-MODIFIED:20180215T164600Z
DTSTART:20180216T170000Z
DTEND:20180216T180000Z
UID:event1922@bu.edu
URL:http://physics.bu.edu/internal/events/show/1922
SUMMARY:Partially Cannibalistic Dark Matter
DESCRIPTION:Featuring Manuel Buen Abad Najar\n\nPart of the Departmental Se
	minars.\n\nAbstract:\nIn the standard model of cosmology the dark matter is
	 composed entirely of cold particles without any interactions other than gr
	avitational\, and it guides the formation of the matter structure of the Un
	iverse. This model has been successful in explaining the data coming from c
	osmological observations.\n\nNevertheless\, as these observations become mo
	re accurate\, discrepancies in the values for the matter power spectrum hav
	e surfaced\, between those values directly measured by weak lensing experim
	ents\, and those obtained with global fits to the cosmic microwave backgrou
	nd. This suggests that the dark matter might have a subdominant component (
	of order few % of the total dark matter) that does not form structure and t
	herefore suppresses the spectrum.\n\nIn this talk I study the possibility t
	hat this component is a "cannibalistic" dark matter: composed of particles 
	that "cannibalize" themselves to keep warm through large 3-to-2 interaction
	s. This keeps the cannibal overdensities from falling in gravitational well
	s\, thereby suppressing matter structure. I will present the mechanism thro
	ugh which this suppression occurs by solving the equations for the evolutio
	n of the energy density perturbations; suggest a particle physics toy model
	 that realizes the cannibal behavior\, and propose some possible UV complet
	ions.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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