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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260930T082901Z
LAST-MODIFIED:20181109T193407Z
DTSTART:20181114T160000Z
DTEND:20181114T170000Z
UID:event1974@bu.edu
URL:http://physics.bu.edu/internal/events/show/1974
SUMMARY:Primordial Standard Clocks as a Direct Probe of the Scenario of the
	 Primordial Universe 
DESCRIPTION:Featuring Xingang Chen\, Harvard University\n\nPart of the HET 
	Seminar Series.\n\nHow to observationally distinguish the inflation scenari
	o from alternatives to inflation model-independently is an important challe
	nge in modern astrophysics and cosmology. In this talk\, we show that massi
	ve fields in the primordial universe can function as standard clocks and im
	print clock signals in the density perturbations that directly record the s
	cale factor of the universe as a function of time\, a(t). This function is 
	the defining property of any primordial universe scenario\, so can be used 
	to falsify competing scenarios in a model-independent fashion. The signals 
	also encode the mass and spin spectra of the particle physics\, excited by 
	the extreme high energy of the primordial universe.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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