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- W2008063051 abstract "There is mounting observational evidence that the expansion of our universe is undergoing an acceleration. A dark energy component has usually been invoked as the most feasible mechanism for the acceleration. However, it is desirable to explore alternative possibilities motivated by particle physics before adopting such an untested entity. In this work, we focus our attention on an acceleration mechanism arising from gravitational leakage into extra dimensions. We test this scenario with high-z Type Ia supernovae compiled by Tonry and coworkers and recent measurements of the X-ray gas mass fractions in clusters of galaxies published by Allen and coworkers. A combination of the two databases gives, at a 99% confidence level, Ωm = 0.29, Ω = 0.21 ± 0.08, and Ωk = -0.36, indicating a closed universe. We then constrain the model using the test of the turnaround redshift, zq=0, at which the universe switches from deceleration to acceleration. We show that, in order to explain that acceleration happened earlier than zq=0 = 0.6 within the framework of gravitational leakage into extra dimensions, a low matter density, Ωm < 0.27, or a closed universe is necessary." @default.
- W2008063051 created "2016-06-24" @default.
- W2008063051 creator A5000820508 @default.
- W2008063051 creator A5081090682 @default.
- W2008063051 date "2005-02-10" @default.
- W2008063051 modified "2023-10-11" @default.
- W2008063051 title "Accelerating Universe from Gravitational Leakage into Extra Dimensions: Testing with Type Ia Supernovae" @default.
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- W2008063051 doi "https://doi.org/10.1086/427061" @default.
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