Abstract
We considered a modified gravity theory through a special kind of ghost-free bimetric gravity, where one massive spin-2 field interacts with a massless spin-2 field. In this bimetric gravity, the late-time cosmic acceleration is achievable. Alongside the background expansion of the Universe, we also studied the first-order cosmological perturbations and probe the signature of the bimetric gravity on large cosmological scales. One possible probe is to study the observational signatures of the bimetric gravity through the post-reionization 21-cm power spectrum. We considered upcoming SKA1-mid antenna telescope specifications to show the prospects of the detectability of the ghost-free bimetric gravity through the post-reionization 21-cm power spectrum. Depending on the values of the model parameter, there is a possibility to distinguish the ghost-free bimetric gravity from the standard \(\Lambda \)CDM model with the upcoming SKA1-mid telescope specifications.
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Acknowledgements
BRD would like to acknowledge IISER, Kolkata, for the financial support through the postdoctoral fellowship. AAS acknowledges the funding from SERB, Government of India, under the research grant MTR/2019/ 000599.
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Bassi, A., Dinda, B.R. & Sen, A.A. Post-reionization 21-cm power spectrum for bimetric gravity and its detectability with SKA1-mid telescope. J Astrophys Astron 44, 93 (2023). https://doi.org/10.1007/s12036-023-09980-6
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DOI: https://doi.org/10.1007/s12036-023-09980-6