6 papers
Brane collisions and braneworld cosmology
Uchida Gen, Akihiro Ishibashi, Takahiro Tanaka
Recently, we proposed a new braneworld model [GIT] in which the collision of a brane universe and a vacuum bubble coming from the extra-dimension is utilized as a trigger of brane…
Quantum Radion on de Sitter branes
Gen Uchida, Misao Sasaki
The quantum fluctuation of the relative location of two (n-1)-dimensional de Sitter branes (i.e., of n spacetime dimensions) embedded in the (n+1)-dimensional anti-de Sitter bulk,…
Brane Big-Bang Brought by Bulk Bubble
Uchida Gen, Akihiro Ishibashi, Takahiro Tanaka
We propose an alternative inflationary universe scenario in the context of Randall-Sundrum braneworld cosmology. In this new scenario the existence of extra-dimension(s) plays an e…
Radion on the de Sitter brane
Uchida Gen, Misao Sasaki
The radion on the de Sitter brane is investigated at the linear perturbation level, using the covariant curvature tensor formalism developed by Shiromizu, Maeda and Sasaki. It is f…
False Vacuum Decay With Gravity in Non-Thin-Wall Limit
Uchida Gen, Misao Sasaki
We consider a wave-function approach to the false vacuum decay with gravity and present a new method to calculate the tunneling amplitude under the WKB approximation. The result ag…
Space-times which are asymptotic to certain Friedman-Robertson-Walker space-times at timelike infinity
Tetsuya Shiromizu, Uchida Gen
We define space-times which are asymptotic to radiation dominant Friedman-Robertson-Walker space-times at timelike infinity and study the asymptotic structure. We discuss the local…