|Date||April 20, 2018||Time||2:30 - 3:30 pm|
|Location||Baylor Research & Innovation Collaborative (BRIC) room 3160|
|Description||Pre-inflationary Dynamics in Loop Quantum Cosmology,|
Loop quantum cosmology (LQC) provides an elegant resolution of the big bang singularity by a quantum bounce in the deep Planck era. In this talk, I shall first give a brief review on LQC, and then present our recent results on the evolution of the universe before inflation.
In particular, I shall show some universal features of the evolution, including the evolution of the background of the universe and its linear (scalar and tensor) perturbations: they are all independent of the inflationary models and initial conditions, as longer as the universe was initially dominated by the kinetic energy of the inflation.
Surprisingly, they can be also all given analytically, despite the complexity of the problem. The corresponding Bogoliubov coefficients are then calculated at the onset of the slow-roll inflation, and shown that particles are generically created during the preinflationary period, in contrast to the currently common assumption that the universe was in a vacuum state at the beginning of the inflation. The effects of the quantum bounce on the power spectra and non-Gaussianity are also investigated and found properties that can be tested by current and forthcoming observations.
Sponsored by the Gravity, Cosmology and Astrophysics Particle (GCAP) Group -- CASPER, and the Baylor Physics Department
For more information, contact Sherri Honza at 254-710-1271
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