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The adiabatic evolution of orbital parameters in the Kerr spacetime
Norichika Sago, Takahiro Tanaka, Wataru Hikida +2
We investigate the adiabatic orbital evolution of a point particle in the Kerr spacetime due to the emission of gravitational waves. In the case that the timescale of the orbital e…
The spectrum of gravitational waves in Randall-Sundrum braneworld cosmology
Tsutomu Kobayashi, Takahiro Tanaka
We study the generation and evolution of gravitational waves (tensor perturbations) in the context of Randall-Sundrum braneworld cosmology. We assume that the initial and final sta…
Gravitational radiation reaction
Takahiro Tanaka
We give a short personally-biased review on the recent progress in our understanding of gravitational radiation reaction acting on a point particle orbiting a black hole. The main…
Escape of black holes from the brane
Antonino Flachi, Takahiro Tanaka
TeV-scale gravity theories allow the possibility of producing small black holes at energies that soon will be explored at the LHC or at the Auger observatory. One of the expected s…
Adiabatic radiation reaction to the orbits in Kerr Spacetime
Norichika Sago, Takahiro Tanaka, Wataru Hikida +1
Geodesic motion of a point particle in Kerr geometry has three constants of motion, energy , azimuthal angular momentum , and Carter constant . Under the adiabatic approxi…
A New delta N Formalism for Multi-Component Inflation
Hyun-Chul Lee, Misao Sasaki, Ewan D. Stewart +2
The delta N formula that relates the final curvature perturbation on comoving slices to the inflaton perturbation on flat slices after horizon crossing is a powerful and intuitive…
Quantum-mechanical generation of gravitational waves in braneworld
Tsutomu Kobayashi, Takahiro Tanaka
We study the quantum-mechanical generation of gravitational waves during inflation on a brane embedded in a five-dimensional anti-de Sitter bulk. To make the problem well-posed, we…
Leading order corrections to the cosmological evolution of tensor perturbations in braneworld (Short version)
Tsutomu Kobayashi, Takahiro Tanaka
Tensor perturbations in an expanding braneworld of the Randall Sundrum type are investigated. We consider a model composed of a slow-roll inflation phase and the succeeding radiati…