Relaxion Dark Matter

Abstract

We highlight a new connection between the Standard Model hierarchy problem and the dark matter sector. The key piece is the relaxion field, which besides scanning the Higgs mass and setting the electroweak scale, also constitutes the observed dark matter abundance of the universe. The relaxation mechanism is realized during inflation, and the necessary friction is provided by particle production. Using this framework we show that the relaxion is a phenomenologically viable dark matter candidate in the keV mass range.

arXiv comment11 pages, 2 figures, 1 table; v2: extended discussion, parameter space includes larger masses and higher reheating temperatures than in v1, matches version accepted by PRD; v3: numerical error corrected, table and figures updated, conclusions unchanged

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Cited by in corpus (14)

• Heterodyne Broadband Detection of Axion Dark Matter
• Coherent relaxion dark matter
• Axion Fragmentation
• Relaxion Fluctuations (Self-stopping Relaxion) and Overview of Relaxion Stopping Mechanisms
• Collider searches of scalar singlets across lifetimes
• Cosmological Relaxation through the Dark Axion Portal
• Relaxion Dark Matter from Stochastic Misalignment
• Fast-Rolling Relaxion
• Electroweak baryogenesis by axionlike dark matter
• Probing photophobic (rel)axion dark matter
• Gravitational tests of electroweak relaxation
• Mixing Particle Production for Relaxion Mechanism
• Structure Formation Limits on Axion-Like Dark Matter
• Axion Fragmentation on the Lattice