We investigate a simple braneworld model in which the universe contains only cold dark matter and a cosmological constant, but the effective dark energy is phantom-like because of extra-dimensional gravity effects. Modified gravity screens the cosmological constant Λ, allowing for a larger Λ. In practice, observations do not favour any significant screening. We use supernova data, the cosmic mi...

We study quasistatic perturbations in a cosmological background in the Dvali-Gabadadze-Porrati braneworld model. We identify the Vainshtein radius at which the nonlinear interactions of the brane bending mode become important in a cosmological background. The Vainshtein radius in the early universe is much smaller than the one in the Minkowski background, but in a self-accelerating universe it ...

After the gravity induced on the brane in the Randall-Sundrum (RS) infinite braneworld is briefly reviewed, we discuss the possibility that black holes evaporate as a result of classical evolution in this model based on the AdS/CFT correspondence. If this possibility is really the case, the existence of long-lived solar mass black holes will give the strongest constraint on the bulk curvature r...

We report results on the construction of cosmological braneworld models in the context of the Einstein-Gauss-Bonnet gravity, which include the leading correction to the Einstein-Hilbert action suggested by superstring theory. We obtain and study the equations governing the dynamics of the standard cosmological models. We find that they can be written in the same form as in the case of the Randa...

Lucas Lombriser, Wayne Hu, Wenjuan Fang, 4 and Uroš Seljak 5, 6 Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland Kavli Institute for Cosmological Physics, Department of Astronomy and Astrophysics, Enrico Fermi Institute, University of Chicago, Chicago, IL 60637 Department of Physics, Columbia University, New York, NY 10027 Brookhaven ...

Abstract In this article, the possibility of construction a traversable wormhole on Randall–Sundrum braneworld with non-exotic matter employing Kuchowicz potential has been studied. We have obtained solution for shape function and studied its properties along validity null energy condition. The junction conditions at surface are used to evaluate model parameters. also density pressure wormhole....

In this work, we study 5-dimensional braneworld scenarios in the scalar-tensor representation of generalized hybrid metric-Palatini gravitational theory. We start by considering a model for brane supported purely scalar fields theory and then consider other distinct cases where models are also an additional matter field. investigate stability gravity sector show that all robust against small fl...