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Título: | Cosmic implications of a low-scale solution to the axion domain wall problem |
Autor: | Caputo, Andrea; Reig, Mario | Fecha de publicación: | sep-2019 | Editor: | American Physical Society | Citación: | Physical Review D 100 (6): 063530 (2019) | Resumen: | The post-inflationary breaking of Peccei-Quinn (PQ) symmetry can lead to the cosmic domain wall catastrophe. In this paper we show how to avoid domain walls by implementing the instanton interference effect with a new interaction which itself breaks PQ symmetry and confines at an energy scale smaller than ΛQCD. We give a general description of the mechanism and consider its cosmological implications and constraints within a minimal model. Contrary to other mechanisms, we do not require an inverse phase transition or fine-tuned bias terms. Incidentally, the mechanism leads to the introduction of new self-interacting dark matter candidates and the possibility of producing gravitational waves in the frequency range of SKA. Unless a fine-tuned hidden sector is introduced, the mechanism predicts a QCD axion in the mass range 1-15 meV. | URI: | http://hdl.handle.net/10261/196183 | DOI: | 10.1103/PhysRevD.100.063530 | Identificadores: | doi: 10.1103/PhysRevD.100.063530 issn: 2470-0029 |
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