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Paper   IPM / Physic / 17331
School of Physics
  Title:   Towards A Realistic Dipole Cosmology: The Dipole $\Lambda $ CDM Model
1.  E. Ebrahimian
2.  Ch. Krishnan
3.  R. Mondol
4.  M.M. Sheikh-Jabbari
  Status:   Preprint
  Year:  2023
  Supported by:  IPM
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 ΛΛCDM 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 ΛΛCDM) is that the relativerelative 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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