The Failures of the Standard Model of Cosmology Require a New Paradigm
Abstract
Cosmological models that invoke warm or cold dark matter cannot explain observed regularities in the properties of dwarf galaxies, their highly anisotropic spatial distributions, nor the correlation between observed mass discrepancies and acceleration. These problems with the standard model of cosmology have deep implications, in particular in combination with the observation that the data are excellently described by Modified Newtonian Dynamics (MOND). MOND is a classical dynamics theory which explains the mass discrepancies in galactic systems, and in the universe at large, without invoking 'dark' entities. MOND introduces a new universal constant of nature with the dimensions of acceleration, a_{0}, such that the preMONDian dynamics is valid for accelerations a ≫ a_{0}, and the deep MONDian regime is obtained for a ≪ a_{0}, where spacetime scale invariance is invoked. Remaining challenges for MOND are (i) explaining fully the observed mass discrepancies in galaxy clusters, and (ii) the development of a relativistic theory of MOND that will satisfactorily account for cosmology. The universal constant a_{0} turns out to have an intriguing connection with cosmology: ā_{0} ≡ 2πa_{0} ≈ cH_{0} ≈ c^{2}(Λ/3)^{1/2}. This may point to a deep connection between cosmology and internal dynamics of local systems.
 Publication:

International Journal of Modern Physics D
 Pub Date:
 December 2012
 DOI:
 10.1142/S0218271812300030
 arXiv:
 arXiv:1301.3907
 Bibcode:
 2012IJMPD..2130003K
 Keywords:

 Cosmology;
 dark matter;
 gravitation;
 MOND;
 98.35.a;
 98.56.p;
 98.62.g;
 98.65.r;
 98.80.k;
 04.20.Cv;
 04.80.Cc;
 95.35.+d;
 98.80.Es;
 Characteristics and properties of the Milky Way galaxy;
 Local group;
 Magellanic Clouds;
 Characteristics and properties of external galaxies and extragalactic objects;
 Galaxy groups clusters and superclusters;
 large scale structure of the Universe;
 Cosmology;
 Fundamental problems and general formalism;
 Experimental tests of gravitational theories;
 Dark matter;
 Observational cosmology;
 Astrophysics  Cosmology and Extragalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 International Journal of Modern Physics D, Vol.21, Issue 14, 13 pages, 1 figure, LaTeX, invited raporteur article on SelfGravitating Systems (chair: David Merritt), 13th Marcel Grossman Meeting, Stockholm