Cosmological constraints on Lorentz violating dark energy
| Autor: | Benjamin Audren, Julien Lesgourgues, Sergey Sibiryakov, Diego Blas |
|---|---|
| Přispěvatelé: | 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), European Organization for Nuclear Research (CERN) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
High Energy Physics - Theory
Astrophysics and Astronomy Cosmology and Nongalactic Astrophysics (astro-ph.CO) dark energy experiments Lorentz transformation FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Lorentz covariance 01 natural sciences 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 High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences dark energy theory 010306 general physics modified gravity Physics 010308 nuclear & particles physics Friedmann equations cosmological parameters from CMBR Astronomy and Astrophysics Gravitational constant High Energy Physics - Phenomenology High Energy Physics - Theory (hep-th) symbols Dark energy Quantum gravity Cosmological constant problem Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Journal of Cosmology and Astroparticle Physics Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2013, 1308, pp.039 JCAP |
| ISSN: | 1475-7508 1475-7516 |
| Popis: | The role of Lorentz invariance as a fundamental symmetry of nature has been lately reconsidered in different approaches to quantum gravity. It is thus natural to study whether other puzzles of physics may be solved within these proposals. This may be the case for the cosmological constant problem. Indeed, it has been shown that breaking Lorentz invariance provides Lagrangians that can drive the current acceleration of the universe without experiencing large corrections from ultraviolet physics. In this work, we focus on the simplest model of this type, called ThetaCDM, and study its cosmological implications in detail. At the background level, this model cannot be distinguished from LambdaCDM. The differences appear at the level of perturbations. We show that in ThetaCDM, the spectrum of CMB anisotropies and matter fluctuations may be affected by a rescaling of the gravitational constant in the Poisson equation, by the presence of extra contributions to the anisotropic stress, and finally by the existence of extra clustering degrees of freedom. To explore these modifications accurately, we modify the Boltzmann code CLASS. We then use the parameter inference code Monte Python to confront ThetaCDM with data from WMAP-7, SPT and WiggleZ. We obtain strong bounds on the parameters accounting for deviations from LambdaCDM. In particular, we find that the discrepancy between the gravitational constants appearing in the Poisson and Friedmann equations is constrained at the level 1.8%. 17 pages, 5 figures |
| Databáze: | OpenAIRE |
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