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Towards A Realistic Dipole Cosmology: The Dipole $\Lambda$CDM Model. (arXiv:2305.16177v2 [astro-ph.CO] UPDATED)

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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 $\Lambda$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 $\Lambda$CDM) is that the $relative$ flow between
radiation and matter can increase at late times, which can contribute to eg.,
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.

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