Cosmology of the Galileon extension of Bekenstein's theory of relativistic Modified Newtonian Dynamics

Abstract

A generalization of Bekenstein's Tensor-Vector-Scalar (TeVeS) model of modified gravity has recently been proposed as an alternative to dark matter. This model -- which we will refer to as g-TeVeS -- utilizes a Galileon-induced Vainshtein mechanism to suppress modifications to General Relativity in strong gravity regimes and so avoids the need to introduce the baroque kinetic terms that typically exist in relativistic models of Modified Newtonian Dynamics (MOND). We explore the behavior of this model in spacetimes with exact Friedmann-Robertson-Walker (FRW) symmetry. The ability of the theory to recover MOND phenomenology places restrictions on the theory's parameter space and it is found that within an estimate of this area of parameter space the theory cannot successfully approximate the Friedmannian cosmological behavior of cold dark matter. It is found that much closer agreement may be recovered in other regions of the theory's parameter space and the reasons for this are discussed.

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Cited by in corpus (11)

• Testing General Relativity in Cosmology
• A new relativistic theory for Modified Newtonian Dynamics
• A general class of gravitational theories as alternatives to dark matter where the speed of gravity always equals the speed of light
• MOND vs. dark matter in light of historical parallels
• Parity violating Friedmann Universes
• Relativistic Khronon Theory in agreement with Modified Newtonian Dynamics and Large-Scale Cosmology
• Dressed black holes in the new tensor-vector-scalar theory
• Covariant formulation of refracted gravity
• Cosmological Principle in Newtonian Dynamics
• Stealth black holes in Aether Scalar Tensor theory
• Distribution of Phantom Dark Matter in Dwarf Spheroidals