Holographic dark matter and Higgs models

Area of Science:

• Particle Physics
• Cosmology
• High-Energy Physics

Background:

• Electroweak symmetry breaking is often explained by composite Higgs models.
• In these models, the Higgs boson is a pseudo-Goldstone boson arising from a dual anti-de Sitter/conformal field theory correspondence.
• A stable composite fermion, X0, is a potential dark matter candidate within this framework.

Purpose of the Study:

• To propose a specific dark matter candidate (X0) within composite Higgs models.
• To describe the effective Lagrangian for the Higgs and X0-multiplets, including higher-dimensional operators.
• To outline methods for testing this model using future colliders and astrophysical observations.

Main Methods:

• Utilizing dual anti-de Sitter/conformal field theory models to describe the Higgs as a holographic pseudo-Goldstone boson.
• Identifying a stable composite fermion (X0) as the dark matter candidate.
• Developing an effective Lagrangian description including higher-dimensional operators for the Higgs and X0-multiplets.

Main Results:

• The proposed dark matter candidate X0 has an expected mass (mX0) of approximately O(TeV).
• This mass range satisfies constraints from cosmological relic density.
• The model's predictions are testable through future collider experiments (LHC, ILC) and astrophysical signals (ultrahigh-energy cosmic rays).

Conclusions:

• The composite fermion X0 is a viable dark matter candidate within composite Higgs models.
• Experimental searches for dark matter provide constraints on these models.
• The interplay between particle physics models and astrophysical observations is crucial for dark matter detection.