Beyond self-acceleration

• Verfasst von: Amendola, Luca [VerfasserIn]
• Verfasst von: Pettorino, Valeria [VerfasserIn]
• Titel: Beyond self-acceleration
• Titelzusatz: force- and fluid-acceleration
• Verf.angabe: Luca Amendola, Valeria Pettorino
• E-Jahr: 2020
• Jahr: 15 January 2020
• Umfang: 11 S.
• Fussnoten: Gesehen am 20.04.2020
• Titel Quelle: Enthalten in: Physics letters / B
• Ort Quelle: Amsterdam : North-Holland Publ., 1967
• Jahr Quelle: 2020
• Band/Heft Quelle: 802(2020) Artikel-Nummer 135214, Seite 1-11
• ISSN Quelle: 1873-2445
• DOI: doi:10.1016/j.physletb.2020.135214
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Cosmic acceleration
• Sach-SW: Cosmology
• Sach-SW: Modified gravity
• Sach-SW: Non universal couplings
• Sach-SW: Self acceleration
• K10plus-PPN: 1695026101

Abstract

The notion of self acceleration has been introduced as a convenient way to theoretically distinguish cosmological models in which acceleration is due to modified gravity from those in which it is due to the properties of matter or fields. In this paper we review the concept of self acceleration as given, for example, by [1], and highlight two problems. First, that it applies only to universal couplings, and second, that it is too narrow, i.e. it excludes models in which the acceleration can be shown to be induced by a genuine modification of gravity, for instance coupled dark energy with a universal coupling, the Hu-Sawicki f(R) model or, in the context of inflation, the Starobinski model. We then propose two new, more general, concepts in its place: force-acceleration and field-acceleration, which are also applicable in presence of non universal cosmologies. We illustrate their concrete application with two examples, among the modified gravity classes which are still in agreement with current data, i.e. f(R) models and coupled dark energy.