Browsing by Author "Logbo, P.H."
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Item New Traversable Wormholes Solutions in f(T) Gravity(arXiv, 2018-09-08) Tefo, R.C.; Logbo, P.H.; Houndjo, M.J.S.; Tossa, J.In this paper we search for dynamical traversable wormhole solution in the modified f(T ) theory of gravity, T being the torsion scalar. For such wormhole, the time dependence is inserted in the static traversable wormhole metric of Morris and Thore. Two set of tetrads are adopted: the diagonal and the non-diagonal tetrads. The diagonal set of tetrads constrains and reduces f(T ) model to teleparallel theory where usual solutions have been found. With diagonal set of tetrads, free from the teleparallel theory constraint, our results show that the existence of traversable wormhole is possible only for non-dynamical spacetime metric, i.e, static traversable wormhole solutions. Moreover we take into account energy condition analysis and the results show that the violation of NEC is not determinant for existence of static traversable wormhole solutions.Item Type IV singular bouncing cosmology from f ( T ) Gravity(arXiv, 2018-07-14) Logbo, P.H.; Houndjo, M.J.S.We investigate bouncing scenario in the modified f(T ) gravity, T being the torsion scalar. Attention is attached to the reconstruction of f(T ) able to describe type IV singular bouncing evolution, where we adopt as assumption that the bouncing and type IV singularity points coincide. In the context of the reconstructed f(T ) model we calculate the Hubble slow-roll parameters in order to determine the dynamical evolution of the cosmological system under study. The results show that the Hubble slow-roll parameters become singular at the type IV singularity indicating a dynamical instability. Moreover we perform the stability analysis of the f(T ) gravity solution where, according to the obtained result, the type IV singularity point is a saddle point in agreement with the bounce scenario.