Cosmological evolution in f(T, B) gravity
Institute of Systems Science, Durban University of Technology, 4000, Durban, South Africa
2 Instituto de Ciencias Físicas y Matemáticas, Universidad Austral de Chile, Valdivia, Chile
3 Departamento de Matemáticas, Universidad Católica del Norte, Avda. Angamos 0610, 1280, Casilla, Antofagasta, Chile
Accepted: 14 October 2021
Published online: 29 October 2021
For the fourth-order teleparallel theory of gravity, we investigate the cosmological evolution for the universe in the case of a spatially flat Friedmann–Lemaître–Robertson–Walker background space. We focus on the case for which is separable, that is, and is a nonlinear function on the scalars T and B. For this fourth-order theory, we use a Lagrange multiplier to introduce a scalar field function which attributes the higher-order derivatives. In order to perform the analysis of the dynamics, we use dimensionless variables which allow the Hubble function to change sign. The stationary points of the dynamical system are investigated both in the finite and infinite regimes. The physical properties of the asymptotic solutions and their stability characteristics are discussed.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021