201 citations · 378 across the 4 of their papers we have counts for
4 papers
Self-Accelerating Universe in Galileon Cosmology
Fabio P Silva, Kazuya Koyama
We present a cosmological model with a solution that self-accelerates at late-times without signs of ghost instabilities on small scales. The model is a natural extension of the Br…
Ghosts in asymmetric brane gravity and the decoupled stealth limit
Kazuya Koyama, Antonio Padilla, Fabio P Silva
We study the spectrum of gravitational perturbations around a vacuum de Sitter brane in a 5D asymmetric braneworld model, with induced curvature on the brane. This generalises the…
Cosmological perturbations in the DGP braneworld: numeric solution
Antonio Cardoso, Kazuya Koyama, Sanjeev S. Seahra +1
We solve for the behaviour of cosmological perturbations in the Dvali-Gabadadze-Porrati (DGP) braneworld model using a new numerical method. Unlike some other approaches in the lit…
Non-linear interactions in a cosmological background in the DGP braneworld
Kazuya Koyama, Fabio P Silva
We study quasi-static perturbations in a cosmological background in the Dvali-Gabadadze-Porrati (DGP) braneworld model. We identify the Vainshtein radius at which the non-linear in…