Journal
PHYSICS LETTERS B
Volume 776, Issue -, Pages 242-248Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2017.11.058
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Funding
- INFN
- FLAG
- QUAGRAP
- STEFI
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We propose an effective anisotropic fluid description for a generic infrared-modified theory of gravity. In our framework, the additional component of the acceleration, commonly attributed to dark matter, is explained as a radial pressure generated by the reaction of the dark energy fluid to the presence of baryonic matter. Using quite general assumptions, and a microscopic description of the fluid in terms of a Bose-Einstein condensate of gravitons, we find the static, spherically symmetric solution for the metric in terms of the Misner-Sharp mass function and the fluid pressure. At galactic scales, we correctly reproduce the leading MOND-like log(r) and subleading (1/r) log(r) terms in the weak-field expansion of the potential. Our description also predicts a tiny (of order 10(-6) for a typical spiral galaxy) Machian modification of the Newtonian potential at galactic scales, which is controlled by the cosmological acceleration. (C) 2017 The Authors. Published by Elsevier B.V.
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