2019-11-12 Abstract
Title: Cosmology with the Domain-dependent Expansion Rate as a Possible Solution to the Hubble Constant Problem
Speaker: Toshifumi Futamase (Kyoto Sangyo U)
Date: November 12 at 11:10
Location: R521, General Building II
Abstract:
There appears to be a discrepancy in the measured values of the Hubble constant in different scales. In fact, the Hubble constant inferred from the Planck satellite mission differs from that obtained by the magnitude-redshift relation of Type Ia supernovae by more than 3 sigma. In this talk, we show that the discrepancy can be resolved by introducing a local expansion rate generated by the domain-dependent averaged density within the framework of general relativity. It is shown that the locally averaged density which differs from the globally averaged density generates locally averaged Hubble constant, as well as the locally averaged spatial curvature irrespective of the global background curvature and the existence of the cosmological constant.