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- W3100685670 startingPage "009" @default.
- W3100685670 abstract "New constraints on inhomogeneous Lema^itre-Tolman-Bondi (LTB) models alternative to Dark Energy are presented, focusing on adiabatic profiles with space-independent Big Bang and baryon fraction. The Baryon Acoustic Oscillation (BAO) scale at early times is computed in terms of the asymptotic value and then projected to different redshifts by following the geodesics of the background metric. Additionally, a model-independent method to constraint the local expansion rate using a prior on supernovae luminosity is presented. Cosmologies described by an adiabatic GBH matter profile with Omega_{out}=1 and Omega_{out}leq 1 are investigated using a Markov Chain Monte Carlo analysis including the latest BAO data from the WiggleZ collaboration and the local expansion rate from the Hubble Space Telescope, together with Union-II type Ia supernovae data and the position and height of the Cosmic Microwave Background acoustic peaks. The addition of BAO data at higher redshifts increases considerably their constraining power and represents a new drawback for this type of models, yielding a value of the local density parameter Omega_{in}>0.2 which is 3sigma apart from the value Omega_{in}<0.15 found using supernovae. The situation does not improve if the asymptotic flatness assumption is dropped, and a Bayesian analysis shows that constrained GBH models are ruled out at high confidence. We emphasize that these are purely geometric probes, that only recently have become sufficiently constraining to independently rule out the whole class of adiabatic LTB models." @default.
- W3100685670 created "2020-11-23" @default.
- W3100685670 creator A5011635269 @default.
- W3100685670 creator A5023599143 @default.
- W3100685670 creator A5038779441 @default.
- W3100685670 date "2012-10-04" @default.
- W3100685670 modified "2023-10-18" @default.
- W3100685670 title "Tension in the void: cosmic rulers strain inhomogeneous cosmologies" @default.
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- W3100685670 doi "https://doi.org/10.1088/1475-7516/2012/10/009" @default.