Loop Quantum Cosmology & The Very Early Universe Interplay between theory and Observations Speaker(s): Abhay Ashtekar
Abstract:
Thanks to the spectacular observational advances since the 1990s, a `standard model' of the early universe has now emerged. However, since it is based on quantum field theory in curved spacetimes, it is not applicable in the Planck era. Using techniques from loop quantum gravity, the theory can be extended over the 12 orders of magnitude in density and curvature from the onset of inflation all the way back to the Planck regime, providing us with a possible completion of the standard model. Contrary to a widespread belief, the resulting preinflationary dynamics can have observational consequences for the longest wave length modes of cosmological perturbations. Thus, there is now an an interesting interplay between fundamental theory and observations. The talk will provide a broad overview of these results addressed to nonexperts.
Weblinks:
Viewpoint: A glance at the earliest universe; APS Physics Spotlighting Exceptional Research: http://physics.aps.org/articles/v5/142
U tube video http://www.youtube.com/watch?v=IFcQuEw0oY8&feature=c4overview&list=UUtOgK mAM4MeFujdHB3_cg
Date: 18/03/2015  2:00 pm
Series: Colloquium
