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SUMMARY:Gravitational waves from density perturbations - Kazuya Koyama (IC
 G\, Portsmouth)
DTSTART:20091104T141500Z
DTEND:20091104T151500Z
UID:TALK20061@talks.cam.ac.uk
CONTACT:Baojiu Li
DESCRIPTION:In this talk\, I review second order generation of gravitation
 al waves from first order density perturbations. The second order gravitat
 ional waves could provide us valuable information on density perturbations
  at very small scales where we do not have any direct way to measure densi
 ty perturbations. We first discuss the second order tensor perturbations\n
 during inflation and how they evolve in the radiation dominated era after 
 inflation. We carefully examine the gauge dependence of the tensor perturb
 ations at second order. We also consider generation of second order tensor
  perturbations in matter dominated era either in early universe after rehe
 ating and in the late time universe.
LOCATION:MR3\, Centre for Mathematical Sciences
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