Abhay Ashtekar is the Eberly Professor of Physics and the Director of the Institute for Gravitational Physics and Geometry at the Pennsylvania State University. As the creator of Ashtekar variables, he is one of the founders of loop quantum gravity. He has written a number of descriptions of loop quantum gravity that are accessible to non-physicists.

Talks by Abhay Ashtekar

Quantum Nature of the Big bang in Simple Models.

Abhay Ashtekar Pennsylvania State University
According to general relativity, space-time ends at singularities and classical physics just stops. In particular, the big bang is regarded as The Beginning. However, general relativity is incomplete because it ignores quantum effects. Through simple models, I will illustrate how the quantum nature of space-time geometry resolves the big bang singularity. Quantum physics does not stop there. Indeed, quantum space-times can be vastly larger than what general relativity had us believe, with unforeseen physical effects in the deep Planck regime.