Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP06(2022)023
Keywords
Finite Temperature or Finite Density; Hierarchy Problem
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Funding
- Collaborative Research Center [SFB1258]
- Munich Institute for Astro-and Particle Physics (MIAPP) - Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC-2094390783311]
- NSF-BSF, ISF
- Azrieli foundation
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This study investigates the effects of finite density on the stability of metastable vacua in relaxion models. By analyzing nucleation seeds from stars and rotating neutron stars, we derive the conditions for the formation and runaway of relaxion bubbles with lower energy minima than in vacuum. The resulting late-time phase transition in the universe provides new constraints on the parameter space of relaxion models.
Finite density effects can destabilize the metastable vacua in relaxion models. Focusing on stars as nucleation seeds, we derive the conditions that lead to the formation and runaway of a relaxion bubble of a lower energy minimum than in vacuum. The resulting late-time phase transition in the universe allows us to set new constraints on the parameter space of relaxion models. We also find that similar instabilities can be triggered by the large electromagnetic fields around rotating neutron stars.
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