Some Japanese Shakespeare Productions in 2014-15

This essay focuses on some Shakespeare productions in Japan during 2014 and 2015. One is a Bunraku version of Falstaff, for which the writer himself wrote the script. It is an amalgamation of scenes from The Merry Wives of Windsor and those from Henry IV. It was highly reputed and its stage design was awarded a 2014 Yomiuri Theatre Award. Another is a production of Much Ado about Nothing produced by the writer himself in a theatre-in-the-round in his new translation. Another is a production of Macbeth arranged and directed by Mansai Nomura the Kyogen performer. All the characters besides Macbeth and Lady Macbeth were performed by the three witches, suggesting that the whole illusion was produced by the witches. It was highly acclaimed worldwide. Another is a production of Hamlet directed by Yukio Ninagawa, with Tatsuya Fujiwara in the title role. It was brought to the Barbican theatre. There were also many other Shakespeare productions to commemorate the 450th anniversary of Shakespeare’s birth

New structural model for GeO2/Ge interface: A first-principles study

First-principles modeling of a GeO2/Ge(001) interface reveals that sixfold GeO2, which is derived from cristobalite and is different from rutile, dramatically reduces the lattice mismatch at the interface and is much more stable than the conventional fourfold interface. Since the grain boundary between fourfold and sixfold GeO2 is unstable, the sixfold GeO2 forms a large grain at the interface. On the contrary, a comparative study with SiO2 demonstrates that SiO2 maintains a fourfold structure. The sixfold GeO2/Ge interface is shown to be a consequence of the ground-state phase of GeO2. In addition, the electronic structure calculation reveals that sixfold GeO2 at the interface shifts the valence band maximum far from the interface toward the conduction band.Comment: 18 pages, 5 figures, and 2 table

On a modification method of Lefschetz thimbles

The QCD at finite density is not well understood yet, where standard Monte Carlo simulation suffers from the sign problem. In order to overcome the sign problem, the method of Lefschetz thimble has been explored. Basically, the original sign problem can be less severe in a complexified theory due to the constancy of the imaginary part of an action on each thimble. However, global phase factors assigned on each thimble still remain. Their interference is not negligible in a situation where a large number of thimbles contribute to the partition function, and this could also lead to a sign problem.In this study, we propose a method to resolve this problem by modifying the structure of Lefschetz thimbles such that only a single thimble is relevant to the partition function. It can be shown that observables measured in the original and modified theories are connected by a simple identity. We exemplify that our method works well in a toy model.Comment: 7 pages, 4 figures, talk presented at the 35th International Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spai

A Study on Financial Deficit and Declining Birthrate — From the Viewpoint of “Children as a Social Security Revenue Source” —-

While social security systems in the developed countries including Japan are taking pay-as-you-go system based on the cooperation between generations, the fertility number as a tax base of social security is decreasing and the low fertility tendency is common in the developed countries. And if each generation behaves with considering life-cycle and chooses the fertility level rationally, it is considered that there is a possibility that the existence of coverage for social security by fiscal deficit may affect the fertility to some extent. Hence, in this paper, if regarding children as a tax base of social security, we consider the following analysis; 1) from a macro viewpoint, by constructing a dynamic overlapping generation model, how the coverage for social security by fiscal deficit affects on fertility, 2) from a micro viewpoint, in case that there is no relationship between social security transfer and fertility of each household, how the fertility number in the whole economy affects. As a result, to 1), we get an implication that there is a possibility fiscal deficit may affect negatively on fertility from the time series analysis with using 17 countries panel data. Moreover, to 2), from a micro viewpoint, by simplified Nash equilibrium game, in case that there is no relationship between social security benefit and fertility number, there is a negative impact as compared to a social optimal fertility level. In this paper, it is shown that, if children are regarded as a tax base, in order to avoid the negative relationship, it is necessary to consider the following policies; 1) the coverage for social security by fiscal deficit should be set to zero, 2) and a system such that the payment schedule is depending on the number of household children should be introduced, considering the balance of benefit and burden.Finacial deficit: endogenous fertility: child investment: social security system

New structural model for GeO2/Ge interface: A first-principles study

First-principles modeling of a GeO2/Ge(001) interface reveals that sixfold GeO2, which is derived from cristobalite and is different from rutile, dramatically reduces the lattice mismatch at the interface and is much more stable than the conventional fourfold interface. Since the grain boundary between fourfold and sixfold GeO2 is unstable, the sixfold GeO2 forms a large grain at the interface. On the contrary, a comparative study with SiO2 demonstrates that SiO2 maintains a fourfold structure. The sixfold GeO2/Ge interface is shown to be a consequence of the ground-state phase of GeO2. In addition, the electronic structure calculation reveals that sixfold GeO2 at the interface shifts the valence band maximum far from the interface toward the conduction band.Comment: 18 pages, 5 figures, and 2 table

Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases

Pseudogap is a ubiquitous phenomenon in strongly correlated systems such as high-$T_{\rm c}$ superconductors, ultracold atoms and nuclear physics. While pairing fluctuations inducing the pseudogap are known to be enhanced in low-dimensional systems, such effects have not been explored well in one of the most fundamental 1D models, that is, Gaudin-Yang model. In this work, we show that the pseudogap effect can be visible in the single-particle excitation in this system using a diagrammatic approach. Fermionic single-particle spectra exhibit a unique crossover from the double-particle dispersion to pseudogap state with increasing the attractive interaction and the number density at finite temperature. Surprisingly, our results of thermodynamic quantities in unpolarized and polarized gases show an excellent agreement with the recent quantum Monte Carlo and complex Langevin results, even in the region where the pseudogap appears.Comment: 6 pages, 5 figure