A local void and the accelerating Universe

By K. Tomita. 2000

172 citations recorded by the source corpus.

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 behavior 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 behavior 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 implication is discussed.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/67beff9885a853f1d671e5c495d4a645a54b499e

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Citations in the corpus

Dark Energy from structure: a status report (2007, background): “In this context, the question whether and how close our obser vers have to be at the center of a regional ‘Hubble bubble’, that probes the exp ected negative curvature region for positive backreaction, furnishes relevant observational input [185], [186], [187] [125], [3].”
Dark Energy and the Accelerating Universe (2008, unknown): “For such Lemaı̂tre-Tolman-Bondi models to be consistent with the supernova data and not to conflict with the isotropy of the CMB, the Milky Way must be near the center of a very large scale, nearly spherical, underdense region (Tomita 2001; Alnes, Amarzguioui & Gron 2006; Enqvist 2007).”
Confronting Lemaitre–Tolman–Bondi models with observational cosmology (2008, background): “This should not come as a surprise, we do live in an (locally) inhomogeneous universe, some say that within a large underdense void [6, 7, 8, 9, 10, 11] similar to that which induces a cold spot in the CMB [12, 13, 14] so why should we assume global homogeneity? In fact, the possibility that we happ”
Modified Gravity-GADGET: A new code for cosmological hydrodynamical simulations of modified gravity models (2013, background): “…on the background expansion of the universe (see e.g. Kolb et al. 2006; Rasanen 2011; Clarkson et al. 2011) or through the presence of a very large void surrounding the Milky Way’s location and mimicking a late-time accelerated expansion (see e.g. Mustapha et al. 1997; Tomita 2001; Wiltshire 2007).”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “Notwithstanding this, the idea that we live near the center of a huge void is attractive for another important reason: a void creates an apparent acceleration field that could in principle match the supernovae observations [891, 892, 220, 474].”