Regular Article - Theoretical Physics
Perturbations of bounce inflation scenario from f(T) modified gravity revisited
Key Laboratory of Quark and Lepton Physics (MOE) and College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, People’s Republic of China
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Accepted: 12 March 2019
Published online: 21 March 2019
In this work, we revisit the perturbations that are generated in the bounce inflation scenario constructed within the framework of f(T) theory. It has been well known that pure f(T) theory cannot give rise to bounce inflation behavior, so aside from the gravity part, we also employ a canonical scalar field for minimal extension. We calculate the perturbations in f(T) theory using the well-established ADM formalism, and find various conditions to avoid their pathologies. We find that it is indeed very difficult to obtain a healthy model without those pathologies, however, one may find a way out if a potential requirement, say, to keep every function continuous, is abandoned.
© The Author(s), 2019