Constraints on a scalar-tensor model with Gauss–Bonnet coupling from SN Ia and BAO observations

2018/07/20 by S. Bellucci, A. Banijamali, B. Fazlpour +1
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Baryon acoustic oscillations #Cosmology #Cosmology and Gravitation Theories #Dark energy #Equation of state #Friedmann–Lemaître–Robertson–Walker metric #Gamma-ray bursts and supernovae #Quintessence #Scalar (mathematics) #Scalar field #astro-ph.CO #gr-qc #hep-th

paper · pdf · doi:10.1007/s10509-019-3629-6

15 pages, 6 figures, 2 tables, PACS numbers: 95.36.+x, 98.80.-k, 04.50.kd, Keywords: Dark energy; Gauss-Bonnet coupling; Observational cosmology. Typos corrected, some clarifying remarks added, a few references added

openalex created_date 2018/07/19 · arxiv created 2018/07/20 · openalex publication_date 2019/08/01 · arxiv updated 2019/09/11 · openalex updated_date 2026/08/05

Abstract

In the present work, the observational consequences of a subclass of of the Horndeski theory have been investigated. In this theory a scalar field (tachyon field) non-minimally coupled to the Gauss-Bonnet invariant through an arbitrary function of the scalar field. By considering a spatially flat FRW universe, the free parameters of the model have been constrained using a joint analysis from observational data of the Type Ia supernovae and Baryon Acoustic Oscillations measurements. The best fit values obtained from these datasets are then used to reconstruct the equation of state parameter of the scalar field. The results show the phantom, quintessence and phantom divide line crossing behavior of the equation of state and also cosmological viability of the model.

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