Distinguishing modified gravity models

Abstract

Modified gravity models with screening in local environments appear in three different guises: chameleon, K-mouflage and Vainshtein mechanisms. We propose to look for differences between these classes of models by considering cosmological observations at low redshift. In particular, we analyse the redshift dependence of the fine structure constant and the proton to electron mass ratio in each of these scenarios. When the absorption lines belong to unscreened regions of space such as dwarf galaxies, a time variation would be present for chameleons. For both K-mouflage and Vainshtein mechanisms, the cosmological time variation of the scalar field is not suppressed in both unscreened and screened environments, therefore enhancing the variation of constants and their detection prospect. We also consider the time variation of the redshift of distant objects using their spectrocopic velocities. We find that models of the K-mouflage and Vainshtein types have very different spectroscopic velocities as a function of redshift and that their differences with the $\Lambda$-CDM template should be within reach of the future ELT- HIRES observations.

18 pages, 10 figures

References in corpus (16)

• Dynamics of dark energy
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Beyond the Cosmological Standard Model
• Environmental Dependence of Masses and Coupling Constants
• Galileon Cosmology
• Cosmic dynamics in the era of Extremely Large Telescopes
• DBI and the Galileon reunited
• Lunar Laser Ranging Tests of the Equivalence Principle
• Exploring the Dark Energy Redshift Desert with the Sandage-Loeb Test
• K-mouflage Cosmology: the Background Evolution
• Anomalous coupling of scalars to gauge fields
• Evolution of the fine-structure constant in runaway dilaton models
• Dark Energy and the MSSM
• K-mouflage gravity models that pass Solar System and cosmological constraints
• K-mouflage effects on clusters of galaxies
• Cosmological Tests of Coupled Galileons

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• Breaking the Vainshtein screening in clusters of galaxies
• Screenings in Modified Gravity: a perturbative approach
• The Shape Dependence of Vainshtein Screening in the Cosmic Matter Bispectrum
• Distinguishing screening mechanisms with environment-dependent velocity statistics
• Cosmological Boundary Flux Parameter
• Extended minimal theories of massive gravity
• Dark energy with oscillatory tracking potential: Observational Constraints and Perturbative effects