Cosmological Implications of 5-dimensional Brans-Dicke Theory
Li-e Qiang, Yan Gong, Yongge Ma, Xuelei Chen
TL;DR
This paper explores a five-dimensional Brans-Dicke cosmological model with two scalar fields, testing its compatibility with supernova and BAO data, and constraining its parameters to explain the universe's accelerated expansion.
Contribution
It introduces a 5D Brans-Dicke model with two scalar fields derived from Killing reduction, and constrains its parameters using observational data.
Findings
Best fit coupling constant is ω = -1.9
Model consistent with SN Ia and BAO observations
Supports scalar fields as drivers of cosmic acceleration
Abstract
The five dimensional Brans-Dicke theory naturally provides two scalar fields by the Killing reduction mechanism. These two scalar fields could account for the accelerated expansion of the universe. We test this model and constrain its parameter by using the type Ia supernova (SN Ia) data. We find that the best fit value of the 5-dimensional Brans-Dicke coupling contant is . This result is also consistent with other observations such as the baryon acoustic oscillation (BAO).
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