Single-Field Consistency Relations of Large Scale Structure. Part III: Test of the Equivalence Principle
Dec 20, 2013
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Abstract: (arXiv)
The recently derived consistency relations for Large Scale Structure do not hold if the Equivalence Principle (EP) is violated. We show it explicitly in a toy model with two fluids, one of which is coupled to a fifth force. We explore the constraints that galaxy surveys can set on EP violation looking at the squeezed limit of the 3-point function involving two populations of objects. We find that one can explore EP violations of order 10^{-3} - 10^{-4} on cosmological scales. Chameleon models are already very constrained by the requirement of screening within the Solar System and only a very tiny region of the parameter space can be explored with this method. We show that no violation of the consistency relations is expected in Galileon models.Note:
- 16 pages, 1 figure. v2: minor changes, JCAP published version
- cosmological perturbation theory
- galaxy clustering
- inflation
- dark energy theory
- equivalence principle
- structure
- galaxy
- perturbation theory
- solar system
- fifth force
References(45)
Figures(1)
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