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| Format: | Preprint |
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2023
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| Online Access: | https://arxiv.org/abs/2304.09766 |
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| _version_ | 1866917908797456384 |
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| author | Czuchry, Ewa Nilsson, Nils A. |
| author_facet | Czuchry, Ewa Nilsson, Nils A. |
| contents | Hořava-Lifshitz gravity has been proposed as a ghost-free quantum gravity model candidate with an anisotropic UV-scaling between space and time. We present here a cosmological background analysis of two different formulations of the theory, with particular focus on the running of the parameter $λ$. Using a large dataset consisting of Cosmic Microwave Background data from {\it Planck}, Pantheon+ supernovae catalogue, SH0ES Cepheid variable stars, Baryon acoustic oscillations (BAO), Cosmic Chronometers, and gamma-ray bursts (GRB), we arrive at new bounds on the cosmological parameters, in particular $λ$, which describes deviation from classical general relativity. For the detailed balance scenario we arrive at the bound $λ=1.02726\pm0.00012$, and for beyond detailed balance the limit reads $λ=0.9949^{+0.0045}_{-0.0046}$. We also study the influence of different data sets and priors, and we find that removing low-redshift data generally moves $λ$ closer towards UV values, whilst simultaneously widening the error bars. In the detailed balance scenario, this effect is more noticeable, and $λ$ takes on values that are significantly below unity, which corresponds to the infrared limit of the theory. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_09766 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | On the energy flow of $λ$ in Hořava-Lifshitz cosmology Czuchry, Ewa Nilsson, Nils A. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology Hořava-Lifshitz gravity has been proposed as a ghost-free quantum gravity model candidate with an anisotropic UV-scaling between space and time. We present here a cosmological background analysis of two different formulations of the theory, with particular focus on the running of the parameter $λ$. Using a large dataset consisting of Cosmic Microwave Background data from {\it Planck}, Pantheon+ supernovae catalogue, SH0ES Cepheid variable stars, Baryon acoustic oscillations (BAO), Cosmic Chronometers, and gamma-ray bursts (GRB), we arrive at new bounds on the cosmological parameters, in particular $λ$, which describes deviation from classical general relativity. For the detailed balance scenario we arrive at the bound $λ=1.02726\pm0.00012$, and for beyond detailed balance the limit reads $λ=0.9949^{+0.0045}_{-0.0046}$. We also study the influence of different data sets and priors, and we find that removing low-redshift data generally moves $λ$ closer towards UV values, whilst simultaneously widening the error bars. In the detailed balance scenario, this effect is more noticeable, and $λ$ takes on values that are significantly below unity, which corresponds to the infrared limit of the theory. |
| title | On the energy flow of $λ$ in Hořava-Lifshitz cosmology |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2304.09766 |