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6 papers · 1 filter
Upper bound for entropy in asymptotically de Sitter space-time
Kengo Maeda, Tatsuhiko Koike, Makoto Narita +1
We investigate nature of asymptotically de Sitter space-times containing a black hole. We show that if the matter fields satisfy the dominant energy condition and the cosmic censor…
Renormalization Group Approach to Einstein Equation in Cosmology
Osamu Iguchi, Akio Hosoya, Tatsuhiko Koike
The renormalization group method has been adapted to the analysis of the long-time behavior of non-linear partial differential equation and has demonstrated its power in the study…
Non-decoupling effects due to a dimensionful coupling
Kenichiro Aoki
We show that the dimensionful scalar cubic coupling in 3+1 dimensions gives rise to non-decoupling effects and analyze the behavior of these effects. In the process, we clarify how…
Excitation Spectra of Circular Few-Electron Quantum Dots
L. P. Kouwenhoven, T. H. Oosterkamp, M. W. S. Danoesastro +4
We study ground states and excited states in semiconductor quantum dots containing 1 to 12 electrons. For the first time, it is possible to identify the quantum numbers of the stat…
Hamiltonian structures for compact homogeneous universes
Masayuki Tanimoto, Tatsuhiko Koike, Akio Hosoya
Hamiltonian structures for spatially compact locally homogeneous vacuum universes are investigated, provided that the set of dynamical variables contains the \Teich parameters, par…
Delay Estimation from noisy time series
Toru Ohira, Ryusuke Sawatari
We propose here a method to estimate a delay from a time series taking advantage of analysis of random walks with delay. This method is applicable to a time series coming out of a…