Effects of modified gravity on the turnaround radius in cosmology

Shin’ichi Nojiri, Sergei D. Odintsov, and Valerio Faraoni

Phys. Rev. D 98, 024005 – Published 2 July 2018

Abstract

We revisit the concept of turnaround radius in cosmology, in the context of modified gravity. While preliminary analyses were limited to scalar-tensor/ $F (R)$ gravity, we extend the definition and the study of this quantity to a much broader class of theories including also quantum $R^{2}$ gravity. The turnaround radius is computed in terms of the parameters of the theory, and it is shown that a deviation not larger than 10% of this quantity from its value in Einstein’s theory could constrain the model parameters and even rule out some current theories.

Received 5 June 2018

DOI:https://doi.org/10.1103/PhysRevD.98.024005

Physics Subject Headings (PhySH)

Alternative gravity theories Dark energy Large scale structure of the Universe

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Shin’ichi Nojiri^1,2, Sergei D. Odintsov^3,4,5,7, and Valerio Faraoni⁶

¹Department of Physics, Nagoya University, Nagoya 464-8602, Japan
²Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya 464-8602, Japan
³Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys, 23, 08010 Barcelona, Spain
⁴Institute of Space Sciences (ICE, CSIC), C. Can Magrans s/n, 08193 Barcelona, Spain
⁵Int. Lab. for Theor. Cosmology, TUSUR, 634050 Tomsk, Russia
⁶Department of Physics and Astronomy and STAR Research Cluster, Bishop’s University, 2600 College Street, Sherbrooke, Québec, Canada J1M 1Z7
⁷Institute of Physics, Kazan Federal University, Kazan 420008, Russia

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Issue

Vol. 98, Iss. 2 — 15 July 2018

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Physical Review D

covering particles, fields, gravitation, and cosmology