The effect of inhomogeneous expansion on the supernova observations

By K. Enqvist, Teppo Mattsson. 2006

168 citations recorded by the source corpus.

We consider an inhomogeneous but spherically symmetric Lemaitre–Tolman–Bondi model to demonstrate that spatial variations of the expansion rate can have a significant effect on the cosmological supernova observations. A model with no dark energy but a local Hubble parameter about 15% larger than its global value fits the supernova data better than the homogeneous model with the cosmological constant. The goodness of the fit is not sensitive to inhomogeneities in the present-day matter density, and our best fit model has ΩM(r) ∼ 0.3, in agreement with galaxy surveys. We also compute the averaged expansion rate, defined by the Buchert equations, of the best fit model and show explicitly that there is no average acceleration.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9c4067b368f82837d091fbfcc86cc8a42b3f7049

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Citations in the corpus

Accelerating Cosmologies with an Anisotropic Equation of State (2007, background): “Local voids have been though suggested as its possible origin [17] (and quite interestingly such voids could explain the present days acceleration too [18]).”
Anisotropic dark energy: dynamics of the background and perturbations (2008, background): “Local voids have been though suggested as its possible origin [17] (and quite interestingly such voids could explain the present days acceleration too [18]).”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “If we assume the inhomogeneous metric (this subsection follows closely the treatment in [456, 64], see [833, Appendix B] for an alternative”
Dark Energy from structure: a status report (2007, unknown): “obser vational data ([56] and references below). The value of LTB studies is more to be seen in the speciﬁcation of observational properties such as the luminosity distance in an inhomogeneous metric [3, 83,17,74,24,2,4], as well as Enqvist (this volume). Although interesting results were obtained, ”
Confronting Lemaitre–Tolman–Bondi models with observational cosmology (2008, methodology): “The other components of Einstein equations read [18, 19]”
Backreaction in Late-Time Cosmology (2011, background): “(In models where we are located at the centre of a spherically symmetric inhomogeneity, apparent acceleration typically does not correspond to local acceleration or average acceleration [53, 54].”