4.7 Article

OFF-CENTER OBSERVERS VERSUS SUPERNOVAE IN INHOMOGENEOUS PRESSURE UNIVERSES

Journal

ASTROPHYSICAL JOURNAL
Volume 792, Issue 2, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/792/2/92

Keywords

cosmology: observations

Funding

  1. National Science Center [DEC-2012/06/A/ST2/00395]

Ask authors/readers for more resources

Exact luminosity distance and apparent magnitude formulae are applied to the Union2 557 supernovae sample in order to constrain the possible position of an observer outside of the center of symmetry in spherically symmetric inhomogeneous pressure Stephani universes, which are complementary to inhomogeneous density Lemaitre-Tolman-Bondi (LTB) void models. Two specific models are investigated. The first allows a barotropic equation of state at the center of symmetry without the need to specify a scale factor function (model IIA). The second has no barotropic equation of state at the center, but has an explicit dust-like scale factor evolution (model IIB). It is shown that even at 3 sigma CL, an off-center observer cannot be further than about 4.4 Gpc away from the center of symmetry, which is comparable to the reported size of a void in LTB models with the most likely value of the distance from the center at about 341 Mpc for model IIA and 68 Mpc for model IIB. The off-center observer cannot be farther away from the center than about 577 Mpc for model IIB at 3 sigma CL. It is determined that the best-fit parameters which characterize inhomogeneity are Omega(inh) = 0.77 (dimensionless: model IIA) and alpha = 7.31 x 10(-9) (s km(-1))(2/3) Mpc(-4/3) (model IIB).

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available