Axion dark matter: strings and their cores

Journal Article · Mon Jan 04 00:00:00 EST 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/01/004· OSTI ID:22458446

Fleury, Leesa ^[1]; Moore, Guy D. ^[2]

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1. McGill University, Department of Physics,3600 rue University, Montréal QC H3A 2T8 (Canada)
2. Institut für Kernphysik, Technische Universität Darmstadt,Schlossgartenstraße 2, D-64289 Darmstadt (Germany)

Axions constitute a well-motivated dark matter candidate, and if PQ symmetry breaking occurred after inflation, it should be possible to make a clean prediction for the relation between the axion mass and the axion dark matter density. We show that axion (or other global) string networks in 3D have a network density that depends logarithmically on the string separation-to-core ratio. This logarithm would be about 10 times larger in axion cosmology than what we can achieve in numerical simulations. We simulate axion production in the early Universe, finding that, for the separation-to-core ratios we can achieve, the changing density of the network has little impact on the axion production efficiency.

• Sponsoring Organization: SCOAP3, CERN, Geneva (Switzerland)
• OSTI ID: 22458446
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 01; Other Information: PUBLISHER-ID: JCAP01(2016)004; OAI: oai:repo.scoap3.org:13307; cc-by Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AXIONS
COMPUTERIZED SIMULATION
COSMOLOGICAL INFLATION
COSMOLOGY
DENSITY
NONLUMINOUS MATTER
SYMMETRY BREAKING
THREE-DIMENSIONAL CALCULATIONS
UNIVERSE