A Closer Look in the Mirror: Reflections on the Matter/Dark Matter Coincidence
Arushi Bodas, Manuel A. Buen-Abad, Anson Hook, and Raman Sundrum

TL;DR
This paper explores a dark sector model explaining the cosmic coincidence of baryon and dark matter abundances through a mirror symmetry, proposing a higher-dimensional framework and discussing potential experimental signatures.
Contribution
It introduces a top-down, higher-dimensional realization of a dark sector with a $ ext{Z}_2$ symmetry, linking baryogenesis and dark matter, and analyzes cosmological and experimental implications.
Findings
Dark matter as stable dark neutrons from a mirror sector.
Order-one couplings mediated by TeV particles allow collider detection.
Residual symmetry breaking explains asymmetric reheating and dark matter abundance.
Abstract
We argue that the striking similarity between the cosmic abundances of baryons and dark matter, despite their very different astrophysical behavior, strongly motivates the scenario in which dark matter resides within a rich dark sector parallel in structure to that of the standard model. The near cosmic coincidence is then explained by an approximate exchange symmetry between the two sectors, where dark matter consists of stable dark neutrons, with matter and dark matter asymmetries arising via parallel WIMP baryogenesis mechanisms. Taking a top-down perspective, we point out that an adequate symmetry necessitates solving the electroweak hierarchy problem in each sector, without our committing to a specific implementation. A higher-dimensional realization in the far UV is presented, in which the hierarchical couplings of the two sectors and the requisite…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsDark Matter and Cosmic Phenomena · Computational Physics and Python Applications · Atomic and Subatomic Physics Research
