Work

Bounce Cosmology in Generalized Modified Gravities

Year: 2019

Type: article

Abstract: We investigate the bounce realization in the framework of generalized modified gravities arising from Finsler and Finsler-like geometries. In particular, a richer intrinsic geometrical structure is reflected in the appearance of extra degrees of freedom in the Friedmann equations that can drive the bounce. We examine various Finsler and Finsler-like constructions. In the cases of general very special relativity, as well as of Finsler-like gravity on the tangent bundle, we show that a bounce cannot easily be obtained. However, in the Finsler–Randers space, induced scalar anisotropy can fulfil bounce conditions, and bouncing solutions are easily obtained. Finally, for the general class of theories that include a nonlinear connection, a new scalar field is induced, leading to a scalar–tensor structure that can easily drive a bounce. These features reveal the capabilities of Finsler and Finsler-like geometries.

Source: Universe

DOI: 10.3390/universe5030074

Authors: Georgios Minas, Emmanuel Saridakis, Panayiotis Stavrinos, Alkiviadis Triantafyllopoulos

Institutions: National and Kapodistrian University of Athens, University of Science and Technology of China, National Technical University of Athens

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,216

Funders: European Commission, European Cooperation in Science and Technology, State Scholarships Foundation, European Social Fund