Modification to the Luminosity Distance Redshift Relation in Modified Gravity Theories

Details Modification to the Luminosity Distance Redshift Relation in Modified Gravity Theories Modification to the Luminosity Distance Redshift Relation in Modified Gravity Theories

2008-10-02

arxiv.org/abs/0810.0535v2

Phys.Rev.D79:044032,2009

Astronomy and Astrophysics

Astrophysics

15 pages, we discuss in more detail how the luminosity distance expression can be used to differentiate among various theories

Scientific paper

10.1103/PhysRevD.79.044032

We derive an expression for the luminosity distance as a function of redshift for a flat Robertson-Walker spacetime perturbed by arbitrary scalar perturbations possibly produced by a modified gravity theory with two different scalar perturbation potentials. Measurements of the luminosity distance as function of redshift provide a constraint on a combination of the scalar potentials and so they can complement weak lensing and other measurements in trying to distinguish among the various alternative theories of gravity.

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