More on modified Gauss-Bonnet gravity

Abstract

A model of modified gravity with non-minimal coupling between a general function of the Gauss-Bonnet invariant, f (G), and matter Lagrangian is an interesting proposal for description of early inflation and late-time cosmic acceleration. In the other hand, energy conditions are simple criteria for viability of a given gravity model. In this paper we consider the above mentioned model of modified gravity with f (G)-matter coupling and study it from the viewpoint of energy conditions.

Tachyonic Teleparallel Dark Energy in Phase Space

“…The model is based on a nonminimal coupling between a noncanonical scalar field (tachyon field) in the context of teleparallel gravity. It is shown in [39] that such a model presents phantom divide crossing during its evolution in agreement with cosmological observations. We have extracted the fixed points of the model and presented the conditions for their existence and stability.…”

“…Tachyonic teleparallel dark energy has been studied in [39]. It is shown that such a scenario can realize phantom divide crossing during its evolution and so exhibits very interesting cosmological behavior.…”

“…It is shown in [39] that DE can realize phantom divide crossing during the cosmological evolution. Without loss of generality, in the following we restrict ourselves in the dust matter case; that is, we assume = 0.…”

“…In [39], we have studied the tachyonic teleparallel dark energy where instead of quintessence we used tachyon scalar field responsible for dark energy. Such a model can also realize the phantom divide crossing.…”

Stability and interacting f(T, T ) gravity with modified Chaplygin gas

“…In order to describe dark energy model, numerous studies have been performed in isotropic space-time such as scalar fields (quintessence, phantom, tachyon and etc.) [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], modified gravity models [24][25][26][27][28][29][30][31], holographic models [32][33][34][35][36][37][38][39][40], interacting models [41][42][43][44][45][46][47][48][49][50][51][52], bouncing model [53][54][55...…”