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Related Experiment Videos

Warped unification, proton stability, and dark matter.

Kaustubh Agashe1, Géraldine Servant

  • 1Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686, USA.

Physical Review Letters
|December 17, 2004
PubMed
Summary

A stable Kaluza-Klein particle with fractional baryon number may solve baryon-number violation in grand unified theories (GUTs). This particle, stable due to its baryon number and color, could be detected in dark matter experiments.

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Area of Science:

  • Particle Physics
  • Cosmology
  • High Energy Physics

Background:

  • Nonsupersymmetric Grand Unified Theories (GUTs) face challenges with baryon-number violation.
  • Warped higher-dimensional spacetimes offer potential solutions to fundamental physics problems.

Purpose of the Study:

  • To investigate the possibility of a stable Kaluza-Klein particle arising from baryon-number violation in GUTs within warped spacetimes.
  • To explore the properties and detection prospects of such exotic particles.

Main Methods:

  • Theoretical analysis of nonsupersymmetric GUTs in warped higher-dimensional spacetimes.
  • Investigating particle stability through conserved quantum numbers (baryon number and SU(3) color).
  • Calculating relic density and mass ranges for potential dark matter candidates.

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Main Results:

  • A stable Kaluza-Klein particle with fractional baryon number and right-handed neutrino quantum numbers is predicted.
  • This particle is linked to the top quark within the higher-dimensional GUT framework.
  • Its relic density is consistent with cosmological observations for masses between 10 GeV and a few TeV.
  • Other exotic GUT partners of the top quark are predicted to be light with distinct collider signatures.

Conclusions:

  • The proposed model offers a compelling solution to baryon-number violation in GUTs.
  • The predicted stable Kaluza-Klein particle is a viable dark matter candidate.
  • The parameter space of these models is testable with near-future dark matter direct detection experiments and high-energy colliders.