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Journal of Cosmology and Astroparticle Physics
The International School for Advanced Studies (SISSA), find out more
Cosmological constraints on Lorentz violating dark energy
B. Audren1, D. Blas2, J. Lesgourgues1,2,3 and S. Sibiryakov4,5
Published 20 August 2013 • Published under licence by IOP Publishing Ltd
Journal of Cosmology and Astroparticle Physics, Volume 2013, August 2013
Citation B. Audren et al JCAP08(2013)039
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Abstract
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 ΘCDM, and study its cosmological implications in detail. At the background level, this model cannot be distinguished from ΛCDM. The differences appear at the level of perturbations. We show that in ΘCDM, 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 ΘCDM with data from WMAP-7, SPT and WiggleZ. We obtain strong bounds on the parameters accounting for deviations from ΛCDM. In particular, we find that the discrepancy between the gravitational constants appearing in the Poisson and Friedmann equations is constrained at the level of 1.8%.
The International School for Advanced Studies (SISSA), find out more
Cosmological constraints on Lorentz violating dark energy
B. Audren1, D. Blas2, J. Lesgourgues1,2,3 and S. Sibiryakov4,5
Published 20 August 2013 • Published under licence by IOP Publishing Ltd
Journal of Cosmology and Astroparticle Physics, Volume 2013, August 2013
Citation B. Audren et al JCAP08(2013)039
DownloadArticle PDF
Download PDF
116 Total downloads
3636 total citations on Dimensions.Article has an altmetric score of 3
Turn on MathJax
Get permission to re-use this article
Share this article
Share this content via email
Share on Facebook (opens new window)
Share on Twitter (opens new window)
Share on Mendeley (opens new window)
Article information
Abstract
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 ΘCDM, and study its cosmological implications in detail. At the background level, this model cannot be distinguished from ΛCDM. The differences appear at the level of perturbations. We show that in ΘCDM, 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 ΘCDM with data from WMAP-7, SPT and WiggleZ. We obtain strong bounds on the parameters accounting for deviations from ΛCDM. In particular, we find that the discrepancy between the gravitational constants appearing in the Poisson and Friedmann equations is constrained at the level of 1.8%.
| Idioma original | Inglés |
|---|---|
| Publicación | JCAP |
| DOI | |
| Estado | Publicada - 20 ago 2013 |