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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Chakrabarti, Soumya | - |
| dc.contributor.author | Dutta, Koushik | - |
| dc.contributor.author | Said, Jackson | - |
| dc.date.accessioned | 2022-12-14T05:57:18Z | - |
| dc.date.available | 2022-12-14T05:57:18Z | - |
| dc.date.issued | 2022 | - |
| dc.identifier.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. | en_GB |
| dc.identifier.uri | https://www.um.edu.mt/library/oar/handle/123456789/104354 | - |
| dc.description.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. | en_GB |
| dc.language.iso | en | en_GB |
| dc.publisher | Oxford Academic | en_GB |
| dc.rights | info:eu-repo/semantics/restrictedAccess | en_GB |
| dc.subject | Scalar field theory | en_GB |
| dc.subject | Dark energy (Astronomy) | en_GB |
| dc.subject | Ricci flow | en_GB |
| dc.subject | Evolution equations | en_GB |
| dc.subject | Calculus of tensors | en_GB |
| dc.title | Screening mechanism and late-time cosmology : role of a Chameleon–Brans–Dicke scalar field | en_GB |
| dc.type | article | en_GB |
| dc.rights.holder | The copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder. | en_GB |
| dc.description.reviewed | peer-reviewed | en_GB |
| dc.identifier.doi | 10.1093/mnras/stac1321 | - |
| dc.publication.title | Monthly Notices of the Royal Astronomical Society | en_GB |
| Appears in Collections: | Scholarly Works - InsSSA | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 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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