Balancing asymmetric dark matter with baryon asymmetry and dilution of frozen dark matter by sphaleron transition

Arnab Chaudhuri, Maxim Yu Khlopov

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we study the effect of electroweak sphaleron transition and electroweak phase transition (EWPT) in balancing the baryon excess and the excess stable quarks of the 4th generation. Sphaleron transitions between baryons, leptons and the 4th family of leptons and quarks establish a definite relationship between the value and sign of the 4th family excess and baryon asymmetry. This relationship provides an excess of stable Ū antiquarks, forming dark atoms—the bound state of (ŪŪŪ) the anti-quark cluster and primordial helium nucleus. If EWPT is of the second order and the mass of U quark is about 3.5 TeV, then dark atoms can explain the observed dark matter density. In passing by, we show the small, yet negligible dilution in the pre-existing dark matter density, due to the sphaleron transition.

Original languageEnglish
Article number275
JournalUniverse
Volume7
Issue number8
DOIs
Publication statusPublished - Aug 2021

Keywords

  • 4th generation
  • Early universe
  • Electroweak phase transition

OECD FOS+WOS

  • 1.03.UP PHYSICS, PARTICLES & FIELDS
  • 1.03.BU ASTRONOMY & ASTROPHYSICS

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