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Cosmological constraints on decaying axion-like particles: a global analysis

Balázs, Csaba; Bloor, Sanjay; Gonzalo, Tomás E. 1; Handley, Will; Hoof, Sebastian 1; Kahlhoefer, Felix 1; Lecroq, Marie; Marsh, David J. E.; Renk, Janina J.; Scott, Pat; Stöcker, Patrick
1 Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT)

Abstract:

Axion-like particles (ALPs) decaying into photons are known to affect a wide range of astrophysical and cosmological observables. In this study we focus on ALPs with masses in the keV-MeV range and lifetimes between 10$^4$ and 10$^{13}$ seconds, corresponding to decays between the end of Big Bang Nucleosynthesis and the formation of the Cosmic Microwave Background (CMB). Using the CosmoBit module of the global fitting framework GAMBIT, we combine state-of-the-art calculations of the irreducible ALP freeze-in abundance, primordial element abundances (including photodisintegration through ALP decays), CMB spectral distortions and anisotropies, and constraints from supernovae and stellar cooling. This approach makes it possible for the first time to perform a global analysis of the ALP parameter space while varying the parameters of ΛCDM as well as several nuisance parameters. We find a lower bound on the ALP mass of around m$_a$>300keV, which can only be evaded if ALPs are stable on cosmological timescales. Future observations of CMB spectral distortions with a PIXIE-like mission are expected to improve this bound by two orders of magnitude.


Volltext §
DOI: 10.5445/IR/1000154710
Veröffentlicht am 18.01.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2022
Sprache Englisch
Identifikator KITopen-ID: 1000154710
Umfang 45 S.
Vorab online veröffentlicht am 26.05.2022
Nachgewiesen in arXiv
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