On the energy flow of $λ$ in Hořava-Lifshitz cosmology

Ewa Czuchry; Nils A. Nilsson

doi:10.1103/PhysRevD.110.043502

paper

On the energy flow of $λ$ in Hořava-Lifshitz cosmology

arXiv:2304.09766 · doi:10.1103/PhysRevD.110.043502

Abstract

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 $λ = 1.02726 \pm 0.00012$ , and for beyond detailed balance the limit reads $λ = 0.994 9_{- 0.0046}^{+ 0.0045}$ . 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.

arXiv comment16 pages, 2 tables, 1 figure

On the energy flow of λ in Hořava-Lifshitz cosmology

Abstract

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On the energy flow of $λ$ in Hořava-Lifshitz cosmology