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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:3
UID:UW-Physics-Event-8422
DTSTART:20231013T180000Z
DTEND:20231013T190000Z
DTSTAMP:20260414T005918Z
LAST-MODIFIED:20231011T074452Z
LOCATION:Chamberlin 5310
SUMMARY:Cosmological gravitational particle production of massive spin
 -2 particles\, Theory Seminar (High Energy/Cosmology)\, Siyang Ling\, 
 Rice University
DESCRIPTION:The phenomenon of cosmological gravitational particle prod
 uction (CGPP) is expected to occur during the period of inflation and 
 the transition into a hot big bang cosmology. Particles may be produce
 d even if they only couple directly to gravity\, and so CGPP provides 
 a natural explanation for the origin of dark matter. In this work we s
 tudy the gravitational production of massive spin-2 particles assuming
  two different couplings to matter. We evaluate the full system of mod
 e equations\, including the helicity-0 modes\, and by solving them num
 erically we calculate the spectrum and abundance of massive spin-2 par
 ticles that result from inflation on a hilltop potential. We conclude 
 that CGPP might provide a viable mechanism for the generation of massi
 ve spin-2 particle dark matter during inflation\, and we identify the 
 favorable region of parameter space in terms of the spin-2 particle's 
 mass and the reheating temperature. As a secondary product of our work
 \, we identify the conditions under which such theories admit ghost or
  gradient instabilities\, and we thereby derive a generalization of th
 e Higuchi bound to Friedmann-Robertson-Walker (FRW) spacetimes.
URL:https://www.physics.wisc.edu/events/?id=8422
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