The low energy regime of 5-D braneworld models with a bulk scalar field is studied. The setup is rather general and includes the Randall-Sundrum and dilatonic braneworlds models as particular cases. We discuss the cosmological evolution of the system and conclude that, in a two brane system, the negative tension brane is generally expected to evolve towards a null warp-factor state. This implie...

Recently it was proposed that microscopic models of braneworld cosmology could be realized in the context AdS/CFT using black hole microstates containing an end-of-the-world brane. Motivated by a desire to establish existence such microstates, which so far have been discussed primarily bottom-up models, we studied similar simpler version AdS/CFT. On one side, define and study boundary states ch...

Abstract The Generalized Uncertainty Principle (GUP) has been discussed in the thick braneworld scenario. By considering Rydberg atoms this background, we show that spacetime geometry affects Maxwell equations inducing an effective dielectric constant on space. In its turn, corrected Coulomb potential by gravitational interaction yields a deviation 3-dimensional Bohr radius. Then, compute corre...

We review a solution (Ref. [1]) of the cosmological constant problem in a braneworld model with infinite-volume extra dimensions. The solution is based on a nonlinear generally covariant theory of a metastable graviton that leads to a largedistance modification of gravity. From the extra-dimensional standpoint the problem is solved due to the fact that the four-dimensional vacuum energy curves ...

We construct a holographic dark energy model with a non-minimally coupled scalar field on the brane where Gauss-Bonnet and Induced Gravity effects are taken into account. This model provides a wide parameter space with several interesting cosmological implications. Especially, the equation of state parameter of the model crosses the phantom divide line and it is possible to realize bouncing sol...

In a companion paper [1], we have introduced a model of scalar field dark energy, Cuscuton, which can be realized as the incompressible (or infinite speed of sound) limit of a k-essence fluid. In this paper, we study how Cuscuton modifies the constraint sector of Einstein gravity. In particular, we study Cuscuton cosmology and show that even though Cuscuton can have an arbitrary equation of sta...

The junction conditions for the infinite derivative gravity theory ${R{+}RF(\Box)R}$ are derived under assumption that can be imposed by avoiding `ill-defined expressions' in of distributions term summations. We find such non-local theories much more restrictive than local theories, since comprise an number equations Ricci scalar. These constrain geometry far beyond matching hypersurface. Furth...