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CATEGORIES:DAMTP Friday GR Seminar
SUMMARY:Perfect bounce in quantum cosmology - Steffen Giel
en (Imperial)
DTSTART;TZID=Europe/London:20160129T130000
DTEND;TZID=Europe/London:20160129T140000
UID:TALK62946AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/62946
DESCRIPTION:A detailed analysis of a quantum cosmological mode
l based on general relativity coupled to conformal
matter (a perfect radiation fluid and conformally
coupled scalars) is presented\, which shows how t
he universe undergoes a nonsingular "perfect bounc
e". This bounce can be described by a path in the
complex plane for the scale factor\, similar to a
well-known description of quantum tunnelling in co
mplex time. In the case of FRW symmetry\, the path
integral and transition amplitudes can be compute
d exactly. For an anisotropic Bianchi I model\, we
give the general solution to the Wheeler-DeWitt e
quation and show how to define global positive- an
d negative-frequency modes which interpolate smoot
hly between negative and positive infinity\, again
encountering no singular behaviour at the "Big Ba
ng". Partial results on nonlinear perturbations su
ggest that the picture can be extended to more gen
eral inhomogeneous universes.
LOCATION:Pavilion B Potter Room (B1.19)
CONTACT:
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