Perturbations in non-flat cosmology for f(T) gravity
Bahamonde S. Dialektopoulos K.F. Hohmann M. Said J.L. Pfeifer C. Saridakis E.N.
March 2023Institute for Ionics
European Physical Journal C
2023#83Issue 3
The study of cosmological perturbation theory in f(T) gravity is a topic of great interest in teleparallel gravity since this is one of the simplest generalizations of the theory that modifies the teleparallel equivalent of general relativity. In this work, we explore the possibility of a non-flat FLRW background solution and perform perturbations for positively as well as negatively curved spatial geometries, together with a comparison to the flat case. We determine the generalized behaviour of the perturbative modes for this non-flat FLRW setting for arbitrary f(T) models, when the most general homogeneous and isotropic background tetrads are used. We also identify propagating modes in this setup, and relate this with the case of a flat cosmology.
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Department of Physics, Tokyo Institute of Technology, 1-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
Laboratory of Theoretical Physics, Institute of Physics, University of Tartu, W. Ostwaldi 1, Tartu, 50411, Estonia
Laboratory of Physics, Faculty of Engineering, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece
Department of Physics, Nazarbayev University, 53 Kabanbay Batyr avenue, Astana, 010000, Kazakhstan
Institute of Space Sciences and Astronomy, University of Malta, Msida, Malta
Department of Physics, University of Malta, Msida, Malta
ZARM, University of Bremen, Bremen, 28359, Germany
National Observatory of Athens, Athens, Lofos Nymfon, 11852, Greece
CAS Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Anhui, Hefei, 230026, China
Department of Physics
Laboratory of Theoretical Physics
Laboratory of Physics
Department of Physics
Institute of Space Sciences and Astronomy
Department of Physics
ZARM
National Observatory of Athens
CAS Key Laboratory for Research in Galaxies and Cosmology
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