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Verfasst von:Liu, Xue-Wen [VerfasserIn]   i
 Heneka, Caroline [VerfasserIn]   i
 Amendola, Luca [VerfasserIn]   i
Titel:Constraining coupled quintessence with the 21 cm signal
Verf.angabe:Xue-Wen Liu, Caroline Heneka and Luca Amendola
E-Jahr:2020
Jahr:21 May 2020
Umfang:? S.
Fussnoten:Gesehen am 06.08.2020
Titel Quelle:Enthalten in: Journal of cosmology and astroparticle physics
Ort Quelle:London : IOP, 2003
Jahr Quelle:2020
Band/Heft Quelle:(2020,5) Artikel-Nummer 038, ? Seiten
ISSN Quelle:1475-7516
Abstract:The 21 cm line probes the evolution of matter perturbations over a wide range of redshifts, from the dark ages to the completion of reionization, and down to the present-day Universe. Observing the 21 cm cosmological signal will extend our understanding of the evolution of the Universe and it is thus important to investigate the predictions of different cosmological models. In this paper we focus on the prospect of constraining coupled quintessence models during the Epoch of Reionization both for global signal experiments and for intensity mapping surveys. To derive the all-sky 21 cm signal and fluctuations in coupled quintessence, we simulate cosmological volumes of the 21 cm signal including the coupling between dark matter and the quintessence field, where the strength of the coupling is labeled by the parameter Q. We show that the coupling between dark matter and quintessence modifies structure formation and expedites the process of reionization. For upcoming 21 cm line surveys like SKA and a fiducial global 21 cm signal experiment, we perform a Fisher matrix analysis to constrain the coupling Q and the dark matter density parameter Ωdm. The results indicate that SKA will be able to place a 68% upper limit of 0.04 on |Q|. At the same time, our fiducial global 21 cm detector constrains the dark matter density parameter Ωdm with a predicted error of ΔΩdm≍ 0.005, whereas SKA sets a weaker constraint of ΔΩdm≍0.1. These constraints are comparable to those already obtained from the cosmic microwave background, but explore an entirely different redshift range.
DOI:doi:10.1088/1475-7516/2020/05/038
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1088/1475-7516/2020/05/038
 DOI: https://doi.org/10.1088/1475-7516/2020/05/038
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1726584100
Verknüpfungen:→ Zeitschrift

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