Cosmological constraints on deviations from Lorentz invariance in gravity and dark matter
| Autor: | Sergey Sibiryakov, Diego Blas, Benjamin Audren, Julien Lesgourgues, Mikhail M. Ivanov |
|---|---|
| Přispěvatelé: | Institut de théorie des phénomènes physiques (EPFL), Ecole Polytechnique Fédérale de Lausanne (EPFL), European Organization for Nuclear Research (CERN), Institute for Nuclear Research of Russian Academy of Sciences (INR), Russian Academy of Sciences [Moscow] (RAS), Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
High Energy Physics - Theory
Astrophysics and Astronomy Cosmology and Nongalactic Astrophysics (astro-ph.CO) media_common.quotation_subject Dark matter FOS: Physical sciences cosmological parameters from LSS General Relativity and Quantum Cosmology (gr-qc) Lorentz covariance Cosmology General Relativity and Quantum Cosmology Gravitation [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Theoretical physics symbols.namesake Planck modified gravity media_common Physics dark matter theory cosmological parameters from CMBR Astronomy and Astrophysics Symmetry (physics) Universe High Energy Physics - Theory (hep-th) symbols Quantum gravity Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Journal of Cosmology and Astroparticle Physics Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2015, 1503, pp.016 |
| ISSN: | 1475-7508 1475-7516 |
| Popis: | We consider a scenario where local Lorentz invariance is violated by the existence of a preferred time direction at every space-time point. This scenario can arise in the context of quantum gravity and its description at low energies contains a unit time-like vector field which parameterizes the preferred direction. The particle physics tests of Lorentz invariance preclude a direct coupling of this vector to the fields of the Standard Model, but do not bear implications for dark matter. We discuss how the presence of this vector and its possible coupling to dark matter affect the evolution of the Universe. At the level of homogeneous cosmology the only effect of Lorentz invariance violation is a rescaling of the expansion rate. The physics is richer at the level of perturbations. We identify three effects crucial for observations: the rescaling of the matter contribution to the Poisson equation, the appearance of an extra contribution to the anisotropic stress and the scale-dependent enhancement of dark matter clustering. These effects result in distinctive features in the power spectra of the CMB and density fluctuations. Making use of the data from Planck and WiggleZ we obtain the most stringent cosmological constraints to date on departures from Lorentz symmetry. Our analysis provides the first direct bounds on deviations from Lorentz invariance in the dark matter sector. Comment: 10 pages, 3 figures, revtex; footnote on isocurvature modes added, discussion on the decoupling of the Standard Model fields from the aether extended, a reference added; version to be published in JCAP |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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