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BEGIN:VEVENT
DTSTAMP:20261021T002836Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20100201T173000Z
DTEND:20100201T183000Z
UID:event583@bu.edu
URL:http://physics.bu.edu/internal/events/show/583
SUMMARY:The Galactic 511-keV Signal\, Hidden Valleys\, and Supernovae
DESCRIPTION:Featuring Hooman Davoudiasl\, Brookhaven National Laboratory\n\
	nPart of the HET Seminar Series.\n\nAbstract:\nWe examine under what circum
	stances the INTEGRAL/SPI 511 keV signal\ncan originate from decays of MeV-s
	cale composite states produced by:\n(A) thermonuclear (type Ia) or (B) core
	 collapse supernovae (SNe).\nThe requisite dynamical properties that would 
	account for the observed\ndata are quite distinct\, for cases (A) and (B). 
	We show that these\nrequirements can be met in simple hidden valley models.
	  An uncommon\nfeature of scenario (A) is that the dynamics of type Ia SNe\
	, standard\ncandles for cosmological measurements\, might be affected by ou
	r\nmechanism.  Simple models for scenario (B) include a long-lived\nparticl
	e that could\, under certain circumstances\, be a viable dark\nmatter candi
	date. The appearance of long-lived particles in typical\nmodels leads to co
	smological constraints and we address how a\nconsistent cosmic history may 
	be achieved.
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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