Varying alpha in a more realistic Universe
By David F. Mota, John D. Barrow. 2003
175 citations recorded by the source corpus.
Abstract We study the space–time evolution of the fine structure constant, α , inside evolving spherical overdensities in a lambda-CDM Friedmann universe using the spherical infall model. We show that its value inside virialised regions will be significantly larger than in the low-density background universe. The consideration of the inhomogeneous evolution of the universe is therefore essential for a correct comparison of extragalactic and solar system limits on, and observations of, possible time variation in α and other constants. Time variation in α in the cosmological background can give rise to no locally observable variations inside virialised overdensities like the one in which we live, explaining the discrepancy between astrophysical and geochemical observations.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/647259add8bc4915f46d3130a8d69b3e9083a02a
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Citations in the corpus
- Cosmological constraints on f(R) gravity theories within the Palatini approach (2005, methodology): “…the spherical collapse model has been set and used for a long time (Peebles 1993; Padmanabhan 1993) and in many different contexts (Lue et al. 2004a; Mota & Barrow 2004a,b; Mota & van de Bruck 2004; Clifton et al. 2005), it has not been applied previously to Nonlinear Gravity Theories.”
- Cluster number counts dependence on dark energy inhomogeneities and coupling to dark matter (2005, background): “This is indeed a general feature of non-minimally coupled scalar fields, whose properties depend on the local density of the region they “live in” (Khoury & Weltman 2004; Mota & Barrow 2004a; Khoury & Weltman 2003; Clifton et al. 2004; Mota & Barrow 2004b; Brax et al. 2004)).”
- Structure formation in inhomogeneous dark energy models (2004, background): “Journal compilation C© 2006 RAS Downloaded from https://academic.oup.com/mnras/article-abstract/368/2/751/985027 by guest on 29 July 2018 density of the region they ‘live in’ (Khoury & Weltman 2004a; Clifton, Mota & Barrow 2004; Khoury & Weltman 2004b; Mota & Barrow 2004a, 2004b), but also of massle”
- Equivalence Principle Implications of Modified Gravity Models (2009, background): “Curvatureinvariant theories such as f(R) screen the scalar via the so-called chameleon mechanism, essentially by giving the scalar a mass that depends on the local density [18, 19, 20, 21, 22, 23, 24].”