Even a tiny cosmological constant casts a long shadow Speaker(s): Abhay Ashtekar
Abstract:
Surprisingly, several basic questions in classical and quantum gravity, which were resolved some 4050 years ago for zero $Lambda$, still remain open in the $Lambda >0$ case. In particular, for $Lambda >0$, we still do not have a satisfactory notion of gravitational radiation or Bondi 4momentum in exact general relativity, nor a positive energy theorem. Similarly, the standard constructions of `in' and `out' Hilbert spaces that we routinely use (e.g. in the analysis of black hole evaporation) do not extend to the $Lambda >0$ case. In this talk I will present some illustrative examples of these quandaries and introduce a systematic approach to resolve the open issues. Date: 19/03/2015  1:00 pm
Series: Strong Gravity
