Francisco S. N. Lobo

f(R,T) gravity

We consider

Extra force in f(R) modified theories of gravity

f(R,T)

Stable dark energy stars

modified theories of gravity, where the gravitational Lagrangian is given by an arbitrary function of the Ricci scalar

Morris-Thorne wormholes with a cosmological constant

R

Wormhole geometries in f(R) modified theories of gravity

and of the trace of the stress-energy tensor

Stability of phantom wormholes

T

Further matters in space-time geometry: f(R,T,RμνTμν) gravity

. We obtain the gravitational field equations in the metric formalism, as well as the equations of motion for test particles, which follow from the covariant divergence of the stress-energy tensor. Generally, the gravitational field equations depend on the nature of the matter source. The field equations of several particular models, corresponding to some explicit forms of the function

f(R,L m ) gravity

f(R,T)

Linearized stability analysis of thin-shell wormholes with a cosmological constant

, are also presented. An important case, which is analyzed in detail, is represented by scalar field models. We write down the action and briefly consider the cosmological implications of the

Chaplygin traversable wormholes

f(R,{T}^{\ensuremath{\phi}})