New Gravitational Scales in Cosmological Surveys

Abstract

In the quasistatic regime, generic modifications to gravity can give rise to novel scale-dependence of the gravitational field equations. Crucially, the detectability of the new scale-dependent terms hinges upon the existence of an effective mass scale or length scale at which corrections to General Relativity become relevant. Starting from only a few basic principles, we derive the general form of this scale-dependence. Our method recovers results previously known in the specific case of Horndeski gravity, but also shows that they are valid more generally, beyond the regime of scalar field theories. We forecast the constraints that upcoming experiments will place on the existence of a new fundamental mass scale or length scale in cosmology.

7+5 pages, submitted to PRD

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• Joint reconstructions of growth and expansion histories from stage-IV surveys with minimal assumptions. II. Modified gravity and massive neutrinos
• Sweeping Horndeski Canvas: New Growth-Rate Parameterization for Modified-Gravity Theories
• Gravitational Waves: A Test for Modified Gravity
• Constraining gravity with a new precision $E_G$ estimator using Planck + SDSS BOSS
• Improving estimates of the growth rate using galaxy-velocity correlations: a simulation study
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• Constraining Scale Dependent Growth with Redshift Surveys
• Principal Components for Model-Agnostic Modified Gravity with 3x2pt
• Weak gravitational flexion in various spacetimes: Exotic lenses and modified gravity
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