Open AccessA local void and the accelerating Universe
Author(s) -
Tomita K.
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04597.x
Subject(s) - physics , local void , void (composites) , astrophysics , supernova , cosmological constant , redshift , cosmology , universe , metric expansion of space , the void , radius , theoretical physics , dark energy , mechanics , galaxy , quantum mechanics , materials science , composite material , two phase flow , flow (mathematics) , computer security , computer science
Corresponding to the recent observational claims that we are in a local void (an underdense region) on scales of 200–300 Mpc, the magnitude–redshift relation in a cosmological model with a local void is investigated. It is already evident that the accelerating behaviour of high‐ z supernovae can be explained in this model, because the local void plays a role similar to the positive cosmological constant. In this paper the dependence of the behaviour on the gaps of cosmological parameters in the inner (low‐density) region and the outer (high‐density) region, the radius of the local void, and the clumpiness parameter is studied and its implications are discussed.