Misalignment vs Topology in Axion-Like Models
arXiv:2108.06203
Abstract
Cosmological axions, an important dark matter candidate, are generated when a scalar field with a spontaneously broken O(2) invariance develops an explicitly O(2)-breaking tilt cosmologically, leading to coherent production of long-wavelength modes which could be dark matter. It appears that the production efficiency of this mechanism is low, despite possible production from topological structures. To understand this better, we examine production in O(N) generalizations. In particular we highlight the importance of how fast the explicit O(N)-breaking potential turns on.
arXiv comment16 pages, 3 figures
References in corpus (12)
- Cosmic strings
- More Axions from Strings
- Early-Universe Simulations of the Cosmological Axion
- Production of dark matter axions from collapse of string-wall systems
- Early seeds of axion miniclusters
- Axion String Constraints
- Evolution of Axionic Strings and Spectrum of Axions Radiated from Them
- Decay of Metastable Topological Defects
- Axion dark matter: strings and their cores
- Axion cold dark matter in view of BICEP2 results
- Scaling Property of the global string in the radiation dominated universe
- The topological susceptibility from grand canonical simulations in the interacting instanton liquid model: chiral phase transition and axion mass