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Open AccessArticle

Bounce Cosmology in Generalized Modified Gravities

1
Section of Astrophysics, Astronomy and Mechanics, Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Athens, Greece
2
Department of Physics, National Technical University of Athens, Zografou Campus, GR 157 73 Athens, Greece
3
Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
4
Department of Mathematics, National and Kapodistrian University of Athens, Panepistimiopolis, 15784 Athens, Greece
*
Author to whom correspondence should be addressed.
Universe 2019, 5(3), 74; https://doi.org/10.3390/universe5030074
Received: 18 February 2019 / Revised: 5 March 2019 / Accepted: 5 March 2019 / Published: 10 March 2019
(This article belongs to the Special Issue Bounce Cosmology)
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. View Full-Text
Keywords: bounce cosmology; Finsler geometry; modified gravity bounce cosmology; Finsler geometry; modified gravity
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MDPI and ACS Style

Minas, G.; Saridakis, E.N.; Stavrinos, P.C.; Triantafyllopoulos, A. Bounce Cosmology in Generalized Modified Gravities. Universe 2019, 5, 74.

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