Seminar:- The Initial State of the Universe
Friedmann-Robertson-Walker(FRW) cosmology which is homogenous and isotropic are in acute conflicts with the attractive nature of gravitation which lumps things together described by General Relativity(GR). The great successes of FRW with experiments quest for paradigm shift in GR. The conformal structures, characterized by the Weyl tensor are missing from GR. Matter doesn't really able to tell space-time how to curve. The intrinsic time formalism of gravitation does generating not only the same physical contents of GR but also allowing the potential being modified to include the conformally invariant Cotton-York(CY) tensor. The CY tensor along with the extrinsic curvature provide a full description of the gravitational d.o.f. in the theory, as a result, no scalar field inflaton is needed to provide the initial exponential spatial expansion.
地點：香港科技大學 李兆基校園 盧家驄薈萃樓 賽馬會高等研究院 4042室
講者：余海禮 教授 Prof Hoi-Lai Yu (Institute of Physics, Academia Sinica)