Tiberiu Harko

f(R,T) gravity

We consider

Extra force in f(R) modified theories of gravity

f(R,T)

Can dark matter be a Bose–Einstein condensate?

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

QUARK STARS ADMITTING A ONE-PARAMETER GROUP OF CONFORMAL MOTIONS

R

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

and of the trace of the stress-energy tensor

f(R,L m ) gravity

T

Wormhole geometries in modified teleparallel gravity and the energy conditions

. 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

Bounds on the basic physical parameters for anisotropic compact general relativistic objects

f(R,T)

Can the galactic rotation curves be explained in brane world models

, 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

Dark matter as a geometric effect in f(R) gravity

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