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Title: | Screening mechanism and late-time cosmology : role of a Chameleon–Brans–Dicke scalar field |
Authors: | Chakrabarti, Soumya Dutta, Koushik Said, Jackson |
Keywords: | Scalar field theory Dark energy (Astronomy) Ricci flow Evolution equations Calculus of tensors |
Issue Date: | 2022 |
Publisher: | Oxford Academic |
Citation: | Chakrabarti, S., Dutta, K., & Said, J. L. (2022). Screening mechanism and late-time cosmology: role of a Chameleon–Brans–Dicke scalar field. Monthly Notices of the Royal Astronomical Society, 514(1), 427-439. |
Abstract: | We discuss a way in which the geometric scalar field in a Brans–Dicke (BD) theory can evade local astronomical tests and act as a driver of the late-time cosmic acceleration. This requires a self-interaction of the BD scalar as well as an interaction with ordinary matter. The scalar field in this construct acquires a density-dependent effective mass much like a Chameleon field. We discuss the viability of this setup in the context of Equivalence Principle, Fifth Force, and Solar System tests. The cosmological consistency is adjudged in comparison with observational data from recalibrated light curves of type Ia supernova (JLA), the Hubble parameter measurements (OHD) and the Baryon Acoustic Oscillation (BAO). We deduct that the astrophysical constraints indeed favour the existence of a mild scalar-matter interaction in the Jordan Frame. |
URI: | https://www.um.edu.mt/library/oar/handle/123456789/104354 |
Appears in Collections: | Scholarly Works - InsSSA |
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File | Description | Size | Format | |
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Screening mechanism and late time cosmology role of a Chameleon Brans Dicke scalar field 2022.pdf Restricted Access | 1.64 MB | Adobe PDF | View/Open Request a copy |
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