https://doi.org/10.1140/epjc/s10052-023-11707-4
Regular Article - Theoretical Physics
Cosmological evolution in bimetric gravity: observational constraints and LSS signatures
1
Centre for Theoretical Physics, Jamia Millia Islamia, 110025, New Delhi, India
2
Department of Physics, Jamia Millia Islamia, 110025, New Delhi, India
Received:
8
February
2023
Accepted:
11
June
2023
Published online:
22
June
2023
Bimetric gravity is an interesting alternative to standard GR given its potential to provide a concrete theoretical framework for a ghost-free massive gravity theory. Here we investigate a class of Bimetric gravity models for their cosmological implications. We study the background expansion as well as the growth of matter perturbations at linear and second order. We use low-redshift observations from SnIa (Pantheon+ and SH0ES), Baryon Acoustic Oscillations (BAO), the growth () measurements and the measurement from Megamaser Cosmology Project to constrain the Bimetric model. We find that the Bimetric models are consistent with the present data alongside the
CDM model. We reconstructed the “ effective dark energy equation of state”(
) and “Skewness”(
) parameters for the Bimetric model from the observational constraints and show that the current low-redshift data allow significant deviations in
and
parameters with respect to the
CDM behaviour. We also look at the ISW effect via galaxy-temperature correlations and find that the best fit Bimetric model behaves similarly to
CDM in this regard.
© The Author(s) 2023
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