Transient weak gravity in scalar-tensor theories

• Verfasst von: Wittner, Manuel [VerfasserIn]
• Verfasst von: Laverda, Giorgio [VerfasserIn]
• Verfasst von: Piattella, Oliver F. [VerfasserIn]
• Verfasst von: Amendola, Luca [VerfasserIn]
• Titel: Transient weak gravity in scalar-tensor theories
• Verf.angabe: Manuel Wittner, Giorgio Laverda, Oliver F. Piattella and Luca Amendola
• E-Jahr: 2020
• Jahr: 8 July 2020
• Umfang: 21 S.
• Fussnoten: Gesehen am 05.10.2020
• Titel Quelle: Enthalten in: Journal of cosmology and astroparticle physics
• Ort Quelle: London : IOP, 2003
• Jahr Quelle: 2020
• Band/Heft Quelle: (2020,7) Artikel-Nummer 019, 21 Seiten
• ISSN Quelle: 1475-7516
• DOI: doi:10.1088/1475-7516/2020/07/019
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1734675314

Abstract

Sub-horizon perturbations in scalar-tensor theories have been shown to grow generically faster than in uncoupled models due to a positive, additive Yukawa force. In such cases, the amount of clustering becomes larger than in the standard cosmological model, exacerbating the observed tension in the σ8 parameter. Here we show instead that in some simple cases of conformally coupled dark energy one can obtain a transient regime of negative Yukawa force, without introducing ghosts or other instabilities.