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Can Cosmic Structure form without Dark Matter?
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abstract
One of the prime pieces of evidence for dark matter is the observation of large overdense regions in the universe. Since we know from the cosmic microwave background that the regions that contained the most baryons when the universe was ~400,000 years old were overdense by only one part in ten thousand, perturbations had to have grown since then by a factor greater than $(1+z_*)\simeq 1180$ where $z_*$ is the epoch of recombination. This enhanced growth does not happen in general relativity, so dark matter is needed in the standard theory. We show here that enhanced growth can occur in alternatives to general relativity, in particular in Bekenstein's relativistic version of MOdified Newtonian Dynamics (MOND). The vector field introduced in that theory for a completely different reason plays a key role in generating the instability that produces large cosmic structures today.
Forward citations
Cited by 2 Pith papers
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Stealth black holes in Aether Scalar Tensor theory
Static spherically symmetric vacuum solutions of AeST include two classes of stealth Reissner-Nordstrom black holes with nontrivial secondary scalar and vector hair.
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Investigating Dark Matter and MOND Models with Galactic Rotation Curve Data: Analysing the Gas-Dominated Galaxies
Gas-dominated galaxies in SPARC exhibit rightward curving geometry in normalized g2-space (r_obs > r_bar), unlike the full sample, indicating the true dynamics and radial dependence of disk mass-to-light ratios.
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