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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-6683
DTSTART:20210921T210000Z
DTEND:20210921T220000Z
DTSTAMP:20260414T190844Z
LAST-MODIFIED:20210916T164829Z
LOCATION:Chamberlin 5280
SUMMARY:Computation of Gravitational Particle Production Using Adiabat
 ic Invariants\, Theory Seminar (High Energy/Cosmology)\, Edward Basso\
 , University of Wisconsin-Madison
DESCRIPTION:Analytic and numerical techniques are presented for comput
 ing gravitational production of scalar particles in the limit that the
  inflaton mass is much larger than the Hubble expansion rate at the en
 d of inflation. These techniques rely upon adiabatic invariants and ti
 me modeling of a typical inflaton field which has slow and fast time v
 ariation components. A faster computation time for numerical integrati
 on is achieved via subtraction of slowly varying components that are u
 ltimately exponentially suppressed. The fast oscillatory remnant resul
 ts in production of scalar particles with a mass larger than the infla
 tionary Hubble expansion rate through a mechanism analogous to perturb
 ative particle scattering. An improved effective Boltzmann collision e
 quation description of this particle production mechanism is developed
 . This model allows computation of the spectrum using only adiabatic i
 nvariants\, avoiding the need to explicitly solve the inflaton equatio
 ns of motion.
\n
\nNote: This is a hybrid event. A zoom link will be d
 istributed via the seminar mailing list. To join\, email the organizer
 .
URL:https://www.physics.wisc.edu/events/?id=6683
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