Effective fluid description of the dark universe

2017/07/31 by Mariano Cadoni, Roberto Casadio, Andrea Giusti +2 · 3 citations
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark fluid #Dark matter #Galaxies: Formation, Evolution, Phenomena #Particle physics #Physics #Theoretical physics #Universe #astro-ph.CO #astro-ph.GA #gr-qc #hep-th

paper · pdf · doi:10.1016/j.physletb.2017.11.058

published as Phys. Lett. B 776 (2018) 242 · 13 pages, no figures. Replaced version: major revisions in the introduction, microscopic derivation of Tully-Fisher relation using Bose-Einstein condensate of gravitons. Some typos corrected

openalex publication_date 2017/12/01 · arxiv created 2017/12/05 · arxiv updated 2017/12/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

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.

Citations

• THE BARYONIC TULLY–FISHER RELATION OF GAS-RICH GALAXIES AS A TEST OF ΛCDM AND MOND
• A modification of the Newtonian dynamics as a possible alternative to the hidden mass hypothesis
• Local anisotropy in self-gravitating systems
• A Measurement of Excess Antenna Temperature at 4080 Mc/s.
• The cosmological constant and dark energy
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Planck2013 results. XVI. Cosmological parameters
• Emergent Gravity and the Dark Universe
• Perspective on MOND emergence from Verlinde's "emergent gravity" and its recent test by weak lensing
• How Dark Matter Came to Matter
• MOND theory

Cited by

• Emergent dark matter in late time universe on holographic screen
• A new perspective on galactic dynamics
• A Simple Model for Explaining Galaxy Rotation Curves