Preprint

PUBDB-2021-03948

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fuzzy Dark Matter Candidates from String Theory

Cicoli, M. ; Guidetti, V. (Corresponding author)DESY* ; Righi, N.DESY* ; Westphal, A.DESY*

2021

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Please use a persistent id in citations: doi:10.3204/PUBDB-2021-03948

Report No.: DESY-21-153; arXiv:2110.02964

Abstract: String theory has been claimed to give rise to natural fuzzy dark matter candidates in the form of ultralight axions. In this paper we revisit this claim by a detailed study of how moduli stabilisation affects the masses and decay constants of different axion fields which arise in type IIB flux compactifications. We find that obtaining a considerable contribution to the observed dark matter abundance without tuning the axion initial misalignment angle is not a generic feature of 4D string models since it requires a mild violation of the $S f\lesssim M_P$ bound, where $S$ is the instanton action and $f$ the axion decay constant. Our analysis singles out $C_4$-axions, $C_2$-axions and thraxions as the best candidates to realise fuzzy dark matter in string theory. For all these ultralight axions we provide predictions which can be confronted with present and forthcoming observations.

Keyword(s): dark matter, fuzzy ; moduli, stability ; axion, decay constant ; compactification, flux ; instanton, action ; string model ; string ; alignment ; Fuzzy dark matter ; ultralight axions ; 4D string models

Note: 34 pages + 4 appendices, v2: minor changes, reviewed and extended results on C2 axions and thraxions

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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. EXC 2121 - Das Quantisierte Universum (390833306) (390833306)
3. STRINGFLATION - Inflation in String Theory - Connecting Quantum Gravity with Observations (647995) (647995)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2021

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Database coverage:
; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Cicoli, M. ; Guidetti, V.DESY* ; Righi, N. (Corresponding author)DESY* ; Westphal, A.DESY*
Fuzzy Dark Matter candidates from string theory
Journal of high energy physics 05(5), 107 (2022) [10.1007/JHEP05(2022)107]2022     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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