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Unexorcized ghost in DGP brane world
Keisuke Izumi, Kazuya Koyama, Takahiro Tanaka
The braneworld model of Dvali-Gabadadze-Porrati realizes the self-accelerating universe. However, it is known that this cosmological solution contains a spin-2 ghost. We study the…
Wronskian Formulation of the Spectrum of Curvature Perturbations
Shuichiro Yokoyama, Takahiro Tanaka, Misao Sasaki +1
We present a new formulation for the evaluation of the primordial spectrum of curvature perturbations generated during inflation, using the fact that the Wronskian of the scalar fi…
Critical escape velocity of black holes from branes
Antonino Flachi, Oriol Pujolas, Misao Sasaki +1
In recent work we have shown that a black hole stacked on a brane escapes once it acquires a recoil velocity. This result was obtained in the {\it probe-brane} approximation, {\it…
Black hole production in tachyonic preheating
Teruaki Suyama, Takahiro Tanaka, Bruce Bassett +1
We present fully non-linear simulations of a self-interacting scalar field in the early universe undergoing tachyonic preheating. We find that density perturbations on sub-horizon…
Exact Wave Propagation in a Spacetime with a Cosmic String
Teruaki Suyama, Takahiro Tanaka, Ryuichi Takahashi
We present exact solutions of the massless Klein-Gordon equation in a spacetime in which an infinite straight cosmic string resides. The first solution represents a plane wave ente…
Dynamics of domain walls intersecting black holes
Antonino Flachi, Oriol Pujolas, Misao Sasaki +1
Previous studies concerning the interaction of branes and black holes suggested that a small black hole intersecting a brane may escape via a mechanism of reconnection. Here we con…