Matter-antimatter asymmetry and dark matter stability from baryon number conservation

Abstract

There is currently no evidence for a baryon asymmetry in our Universe. Instead, cosmological observations have only demonstrated the existence of a quark-antiquark asymmetry, which does not necessarily imply a baryon asymmetric Universe, since the baryon number of the dark sector particles is unknown. In this paper we discuss a framework where the total baryon number of the Universe is equal to zero, and where the observed quark-antiquark asymmetry arises from neutron portal interactions with a dark sector fermion $N$ that carries baryon number. In order to render a baryon symmetric universe throughout the whole cosmological history, we introduce a complex scalar $\chi$, with opposite baryon number and with the same initial abundance as $N$. Notably, due to the baryon number conservation, $\chi$ is absolutely stable and could have an abundance today equal to the observed dark matter abundance. Therefore, in this simple framework, the existence of a quark-antiquark asymmetry is intimately related to the existence (and the stability) of dark matter.

arXiv commentCorrected asymmetry dynamics, conclusion unchanged. 15 pages, 5 figures

References in corpus (33)

• Gauge Singlet Scalars as Cold Dark Matter
• Update on scalar singlet dark matter
• Asymmetric Dark Matter: Theories, Signatures, and Constraints
• Review of asymmetric dark matter
• The Sphaleron Rate in the Minimal Standard Model
• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• Baryon Asymmetry of the Universe in the Minimal Standard Model
• Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector
• Dark Matter Interpretation of the Neutron Decay Anomaly
• Hylogenesis: A Unified Origin for Baryonic Visible Matter and Antibaryonic Dark Matter
• Dark Matter through the Higgs portal
• Forbidden Dark Matter
• Dark Matter and the Baryon Asymmetry
• Dark Matter from Baryon Asymmetry
• On Relating the Genesis of Cosmic Baryons and Dark Matter
• Baryogenesis and Dark Matter from $B$ Mesons
• ManeParse: a Mathematica reader for Parton Distribution Functions
• Baryon Asymmetry, Dark Matter and Quantum Chromodynamics
• Search for invisible Higgs-boson decays in events with vector-boson fusion signatures using 139 ${\text{fb}}^{-1}$ of proton-proton data recorded by the ATLAS experiment
• A Simultaneous Solution to Baryogenesis and Dark Matter Problems
• Baryogenesis from Oscillations of Charmed or Beautiful Baryons
• Dark Matter Freeze-out During Matter Domination
• Neutron-Antineutron Oscillation Search using a 0.37 Megaton$\cdot$Year Exposure of Super-Kamiokande
• Cosmological and astrophysical probes of dark baryons
• Higgsogenesis
• Light particles with baryon and lepton numbers
• Baryogenesis from neutron-dark matter oscillations
• Baryogenesis with Higher Dimension Operators
• Nucleon - Light Dark Matter Annihilation through Baryon Number Violation
• Early Matter Domination from Long-Lived Particles in the Visible Sector
• Neutron Dark Decay
• Sharing but not Caring: Dark Matter and the Baryon Asymmetry of the Universe
• Baryonic and Leptonic GeV Dark Matter

Cited by in corpus (3)

• Minimal effective theory for leptogenesis, dark matter, and neutrino masses
• Postsphaleron darkogenesis
• Neutron Portal and Dark Matter-Baryon Coincidence: from UV Completion to Phenomenology