https://doi.org/10.1140/epjc/s10052-019-7201-x
Regular Article - Theoretical Physics
Exact solutions and accelerating universe in modified Brans–Dicke theories
1
Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, 741246, India
2
Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
* e-mail: soumya@cts.iitkgp.ernet.in
Received:
25
June
2019
Accepted:
4
August
2019
Published online:
13
August
2019
Exact solutions are studied in the context of modified Brans–Dicke theory. The non-linearity of the modified Brans–Dicke field equations is treated with the Euler–Duarte–Moreira method of integrability of anharmonic oscillator equation. While some solutions show a forever accelerating nature, in some cases there is a signature flip in the evolution of deceleration parameter in recent past. Importance of these latter models are studied in the context of late time acceleration of the universe. Constraints on the model parameters are obtained from Markov Chain Monte Carlo (MCMC) analysis using the Supernova distance modulus data, observational measurements of Hubble parameter, Baryon acoustic oscillation data and the CMB Shift parameter data.
© The Author(s), 2019
