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Cosmological dipole in tilted anisotropic universes

Alicia Martín1,*, Constantinos Skordis2,1, Deaglan J. Bartlett1, Harry Desmond3, Pedro G. Ferreira1, and Tariq Yasin1

  • *Contact author: alicia.martin@physics.ox.ac.uk
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Phys. Rev. D 114, 023526 – Published 10 July, 2026

DOI: https://doi.org/10.1103/82sh-h3cv

Abstract

There is tentative evidence for a mismatch between the rest frames of matter and the cosmic microwave background, the “quasar dipole anomaly.” We consider such a dipole in tilted anisotropic models, for a range of scenarios and sources: spatial curvature, cosmic heat flux, large scale electromagnetic fields, and a Khronon field. Crucially, we determine the ancillary effects on other cosmological observables in each of these models, and we show that, apart from the case of the Khronon field, it is unlikely that one can obtain a dipole with the amplitude that is being observed unless one considers additional exotica.

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Phys. Rev. D 114, 023526– Published 10 July, 2026
  • Received 3 December 2025
  • Accepted 17 June 2026
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