Towards a realistic dipole cosmology: the dipole �CDM model

Ebrahimian, E and Krishnan, C and Mondol, R and Sheikh-Jabbari, MM (2024) Towards a realistic dipole cosmology: the dipole �CDM model. In: Classical and Quantum Gravity, 41 (14).

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Abstract

Dipole cosmology is the maximally Copernican generalization of the FLRW paradigm that can incorporate bulk flows in the cosmic fluid. In this paper, we first discuss how multiple fluid components with independent flows can be realized in this set up. This is the necessary step to promote �tilted� Bianchi cosmologies to a viable framework for cosmological model building involving fluid mixtures (as in FLRW). We present a dipole �CDM model which has radiation and matter with independent flows, with (or without) a positive cosmological constant. A remarkable feature of models containing radiation (including dipole �CDM) is that the relative flow between radiation and matter can increase at late times, which can contribute to e.g. the CMB dipole. This can happen generically in the space of initial conditions. We discuss the significance of this observation for late time cosmic tensions. © 2024 IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	Classical and Quantum Gravity
Publisher:	Institute of Physics
Additional Information:	The copyright for this article belongs to Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	18 Dec 2024 04:23
Last Modified:	18 Dec 2024 04:23
URI:	http://eprints.iisc.ac.in/id/eprint/85824

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