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Matter-dark matter coincidence and the mirror world

Rabindra N. Mohapatra1 and Nobuchika Okada2

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Phys. Rev. D 111, 123510 – Published 9 June, 2025

DOI: https://doi.org/10.1103/jwxp-dzlj

Abstract

Why matter and dark matter contents of the Universe are of the same order of magnitude, is one of the puzzles of modern cosmology. At the face of it, this would seem to point toward a basic similarity between matter and dark matter, suggesting perhaps the widely discussed mirror world picture as an ideal setting for a discussion of this issue. Here we outline a new and simple mirror world scenario to explain this puzzle. Our model uses the Affleck-Dine mechanism to generate baryon asymmetry and dark matter relic density leading to an asymmetric dark matter picture. We find that, for a certain parameter range of the model, the mirror electron is the unique possibility for dark matter whereas, in the complementary parameter range, the mirror baryons constitute the dark matter. In either case, the mirror photon must have mass in the MeV range for consistency with observations. For the case of mirror electron dark matter, the model predicts a lower bound on the amount of dark radiation, i.e., ΔNeff≥0.007.

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Phys. Rev. D 111, 123510– Published 9 June, 2025
  • Received 26 February 2025
  • Accepted 21 May 2025
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