Constraints on Dark Energy and Modified Gravity models by the Cosmological Redshift Drift test

Deepak Jain; Sanjay Jhingan

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arxiv 0910.4825 v3 pith:TCYJJFBU submitted 2009-10-26 gr-qc astro-ph.COhep-th

Constraints on Dark Energy and Modified Gravity models by the Cosmological Redshift Drift test

Deepak Jain , Sanjay Jhingan This is my paper

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keywords cosmologicalmodelsuniverseconstraintsgravityredshifttesttime

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We study cosmological constraints on the various accelerating models of the universe using the time evolution of the cosmological redshift of distant sources. The important characteristic of this test is that it directly probes the expansion history of the universe. In this work we analyze the various models of the universe which can explain the late time acceleration, within the framework of General Theory of Relativity (GR) (XCDM, scalar field potentials) and beyond GR (f(R) gravity model).

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Nonlinear Relativistic Effects on Cosmological Redshift Drift
astro-ph.CO 2026-04 unverdicted novelty 8.0

Second-order relativistic effects on redshift drift are computed, showing distortions appear only at this order with enhanced nonlinear bispectrum contributions at low redshift and large momenta.