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2004•Monthly Notices of the Royal Astronomical SocietyOpen access

Cosmic acceleration and extra dimensions: constraints on modifications of the Friedmann equation

Ø. Elgarøy, Tuomas Multamäki

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Abstract

An alternative to dark energy as an explanation for the present phase of accelerated expansion of the Universe is that the Friedmann equation is modified, e.g. by extra dimensional gravity, on large scales. We explore a natural parametrization of a general modified Friedmann equation, and find that the present supernova Type Ia and cosmic microwave background data prefer a correction of the form 1/H to the Friedmann equation over a cosmological constant.

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An alternative to dark energy as an explanation for the present phase of accelerated expansion of the Universe is that the Friedmann equation is modified, e.g. by extra dimensional gravity, on large scales. We explore a natural parametrization of a general modified Friedmann equation, and find that the present supernova Type Ia and cosmic microwave background data prefer a correction of the form 1/H to the Friedmann equation over a cosmological constant.

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Available abstract

An alternative to dark energy as an explanation for the present phase of accelerated expansion of the Universe is that the Friedmann equation is modified, e.g. by extra dimensional gravity, on large scales. We explore a natural parametrization of a general modified Friedmann equation, and find that the present supernova Type Ia and cosmic microwave background data prefer a correction of the form 1/H to the Friedmann equation over a cosmological constant.

Key concepts: Friedmann equations, Physics, Dark energy, Cosmic microwave background, Parametrization (atmospheric modeling), Friedmann–Lemaître–Robertson–Walker metric, Scale factor (cosmology), Supernova

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