Generalized second law in modified theory of gravity

In the context of modified theory of gravity (f(R) gravity) we try to study the conditions required for validity of the generalized second law.Comment: 9 pages, accepted for publication in Phys. Rev.

Generalized Noether symmetry in f(T) gravity

We consider modified teleparallel gravity, (f(T) gravity), as a framework to explain the present accelerated expansion of the universe. The matter component is assumed to be cold dark matter. To find the explicit form of the function $f$, we utilize generalized Noether theorem and use generalized vector fields as variational symmetries of the corresponding Lagrangian. We study the cosmological consequences of the obtained results.Comment: 14 pages, 3 figure