Preprint

PUBDB-2025-00965

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A New Source for (QCD) Axion Dark Matter Production: Curvature-Induced

Eroencel, C.DESY* ; Gouttenoire, Y. (Corresponding author)Extern* ; Sato, R.DESY* ; Servant, G. (Corresponding author)DESY* ; Simakachorn, P.Extern*

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-00965

Report No.: DESY-25-033; arXiv:2503.04880

Abstract: We discuss a novel mechanism for generating dark matter from a fast-rolling scalar field, relevant for both inflation and rotating axion models, and apply it specifically to the (QCD) axion. Dark matter comes from scalar field fluctuations generated by the product of the curvature perturbation and the fast-rolling background field. These fluctuations can explain the totality of dark matter in a vast axion parameter space, particularly for the QCD axion, which will be targeted by upcoming experiments. We review the constraints on this mechanism and potential gravitational-wave signatures.

Note: 5 pages, 3 figures + appendix

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. DFG project G:(GEPRIS)390831469 - EXC 2118: Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA+) (390831469) (390831469)
3. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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