Tahara, Japan
Tahara, Japan

Tsuru University is a small municipal university located in Tsuru City, Yamanashi Prefecture, Japan. The university has around 3,000 students and 85 faculty. The campus rises into the mountains overlooking the 35,000 residents of Tsuru City. Wikipedia.

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Hirano K.,Tsuru University
General Relativity and Gravitation | Year: 2016

We compare observational data of growth rate with the prediction by Galileon theory. For the same value of the energy density parameter Ωm , 0, the growth rate in Galileon models is enhanced compared with the ΛCDM case, due to the enhancement of Newton’s constant. The smaller Ωm , 0 is, the more suppressed growth rate is. Hence the best fit value of Ωm , 0 in the Galileon model is 0.16 from only the growth rate data, which is considerably smaller than such value obtained from observations of supernovae Ia, the cosmic microwave background and baryon acoustic oscillations. We also find the upper limit of the Brans–Dicke parameter to be ω< - 1000 (1 σ), from the growth rate data. In this paper, specific galileon models are considered, not the entire class. More and better growth rate data are required to distinguish between dark energy and modified gravity. © 2016, Springer Science+Business Media New York.

Hiyama E.,RIKEN | Kamimura M.,Kyushu University | Yamamoto Y.,Tsuru University | Motoba T.,University of Electro - Communications
Physical Review Letters | Year: 2010

Energy levels of the double Λ hypernucleus, BeΛΛ11 are calculated within the framework of a ααnΛΛ five-body model. Interactions between constituent particles are determined so as to reproduce reasonably the observed low-energy properties of the αα, ααn nuclei and the existing data for Λ-binding energies of the αΛ, ααΛ, αnΛ, and ααnΛ systems. An effective ΛΛ interaction is constructed so as to reproduce, within the αΛΛ three-body model, the BΛΛ of HeΛΛ6, which was extracted from the emulsion experiment, the NAGARA event. With no adjustable parameters for the ααnΛΛ system, BΛΛ of the ground and bound excited states of BeΛΛ11 are calculated with the Gaussian expansion method. The Hida event, recently observed at KEK-E373 experiment, is interpreted as an observation of the ground state of the BeΛΛ11. © 2010 The American Physical Society.

Furumoto T.,Kyoto University | Furumoto T.,RIKEN | Sakuragi Y.,RIKEN | Sakuragi Y.,Osaka City University | Yamamoto Y.,Tsuru University
Physical Review C - Nuclear Physics | Year: 2010

The recent works by the present authors predicted that the real part of heavy-ion optical potentials changes its character from attraction to repulsion around the incident energy per nucleon E/A = 200-300 MeV on the basis of the complex G-matrix interaction and the double-folding model (DFM) and revealed that the three-body force plays an important role there. In the present paper, we have precisely analyzed the energy dependence of the calculated DFM potentials and its relation to the elastic-scattering angular distributions in detail in the case of the 12C + 12C system in the energy range of E/A = 100-400 MeV. The tensor force contributes substantially to the energy dependence of the real part of the DFM potentials and plays an important role to lower the attractive-to-repulsive transition energy. The nearside and farside (N/F) decompositions of the elastic-scattering amplitudes clarify the close relation between the attractive-to-repulsive transition of the potentials and the characteristic evolution of the calculated angular distributions with the increase of the incident energy. Based on the present analysis, we propose experimental measurements for the predicted strong diffraction phenomena of the elastic-scattering angular distribution caused by the N/F interference around the attractive-to-repulsive transition energy together with the reduced diffractions below and above the transition energy. © 2010 The American Physical Society.

Yamamoto Y.,Tsuru University | Hiyama E.,RIKEN | Rijken Th.A.,Radboud University Nijmegen
Nuclear Physics A | Year: 2010

The features of the new YN interaction model ESC08 are studied on the basis of the G-matrix theory. © 2010 Elsevier B.V. All rights reserved.

While the notion of face has continued to play a key role in many accounts of im/politeness, there have increasingly been calls for im/politeness to be theorized in its own right, drawing from the emic understandings of members in relation to im/politeness. In this paper, we make a contribution to this latter agenda by comparing emic understandings of attentiveness, and the related notions of empathy and anticipatory inference in Japanese and Taiwanese Mandarin Chinese. Drawing from metapragmatic interviews with Japanese and Taiwanese participants from two different generations, we suggest that there are both similarities and differences in the ways in which these notions are conceptualized among speakers of Japanese and Mandarin Chinese spoken in Taiwan. It was found that while the participants evaluated these practices positively, and in some cases linked them to politeness concerns, in other instances they evaluated them negatively. Intracultural variability also emerged in the course of our cross-generational-cultural comparison. We conclude that further work investigating the metapragmatics of interpersonal notions such as attentiveness, empathy and anticipatory inference is necessary if we are to better understand the moral grounds on which evaluations of im/politeness are made across different languages and cultures. © 2014 Elsevier B.V.

Rijken Th.A.,Radboud University Nijmegen | Nagels M.M.,Radboud University Nijmegen | Yamamoto Y.,Tsuru University
Nuclear Physics A | Year: 2010

We analyze and discuss the extended-soft-core models ESC04 and ESC08, which at present are the most complete meson-exchange models for the baryon-baryon interactions. The ESC-model describes the nucleon-nucleon (NN), hyperon-nucleon (YN), and hyperon-hyperon (YY), in terms of meson-exchanges using (broken) S UF (3)-symmetry. In this approach to baryon-baryon (BB) the dynamics is derived from (i) one-boson-exchanges (OBE), (ii) two-meson-exchanges (TME), and (iii) meson-pair-exchanges (MPE), (iv) gluon-exchanges, and (v) quark-core effects. In the OBE-sector, special features are the importance of the axial-vector meson potentials, and the inclusion of a zero in the scalar- and axial-meson form-factors. Novel for the ESC08-versions is the inclusion of (a) odderon-exchange, and (b) special pronounced effects of the appearance of forbidden six-quark configurations. With these ingredients a rather flexible dynamical framework is constructed. Namely, it appeared feasible to keep the parameters of the model in reasonable accordance with the predictions of the 3P0 quark-pair-creation model (QPC), although in ESC08a,b a certain admixture of 3S1 quark-pair creation is present. This is the case for the meson- and meson-pair-baryon coupling constants and the F / (F + D)-ratio's as well. The NN, YN, and YY results for this model are excellent. This is marked in particularly by the NN-results, namely χp . d . p . 2 = 1.180 and 1.135 for respectively ESC08a and ESC08b. Also, we improved the ΛN spin-orbit interaction greatly by the inclusion of (a) the Brown, Downs, and Iddings anti-symmetric spin-orbit potentials, and (b) new corrections to the MPE-potentials. Also, the special quark-core effects provide ample repulsion in the Σ+ p (3S1, T = 3 / 2)- and Σ N (1S0, T = 1 / 2)-channels. © 2010 Elsevier B.V. All rights reserved.

Hirano K.,Tsuru University | Hirano K.,Ichinoseki National College of Technology | Komiya Z.,Tokyo University of Science | Shirai H.,Ichinoseki National College of Technology
Progress of Theoretical Physics | Year: 2012

We studied the cosmological constraints on Galileon gravity obtained from observational data of the growth rate of matter density perturbations, the supernovae Ia (SN Ia), the cosmic microwave background (CMB), and baryon acoustic oscillations (BAO). For the same value of the energy density parameter of matter Ω m, 0, the growth rate f in Galileon models is enhanced relative to the ΛCDM case, because, of an increase in Newton's constant. The smaller the Ω m,0, the more the growth rate is suppressed. Therefore, the best fit value of Ω m, 0 in the Galileon model, based only on the growth rate data, is quite small. This is incompatible with the value of Ω m, 0 obtained from the combination of SN Ia, CMB, and BAO data. On the other hand, in the ΛCDM model, the values of Ω m, 0 obtained from different observational data sets are consistent. In the analysis presented in this paper, we found that the Galileon model is less compatible with observations than the ΛCDM model. This result seems to be qualitatively the same in most of the generalized Galileon models in which Newton's constant is enhanced.

Nishi N.,Tsuru University
Journal of the Yamashina Institute for Ornithology | Year: 2012

On 27 May 2011 at Mitachi, Ohtsuki, Yamanashi Prefecture, a male Blue Rockthrush Monticola solitarius was observed carrying food to a place where there might be a nest. On 30 May, the nest was found under the eaves of the second floor of a two-story house. The sound of at least two nestlings was heard from the nest. On June 3 and 4, the nestlings left the nest one by one. On 7 June, a fledgling was observed with the parents 150 m away from the nest. This is the first breeding record of the Blue Rockthrush in Yamanashi Prefecture. © Yamashina Institute for Ornithology.

Hirano K.,Tsuru University
International Journal of Modern Physics A | Year: 2014

Constraints on neutrino masses are estimated based on future observations of the cosmic microwave background (CMB), which includes the B-mode polarization produced by CMB lensing from the Planck satellite, and the growth rate of cosmic structure from the Euclid redshift survey by using the Markov-Chain Monte-Carlo (MCMC) method. The error in the bound on the total neutrino mass is estimated to be Δ σ mν = 0.075 eV with a 68% confidence level. By using the growth rate rather than the galaxy power spectrum, accurate constraints are obtained, since the growth rate is less influenced by the uncertainty regarding galaxy bias than by the galaxy power spectrum. © 2015 World Scientific Publishing Company. © World Scientific Publishing Company.

Hirano K.,Tsuru University
AIP Conference Proceedings | Year: 2014

Constraints on neutrino masses are estimated based on future observations of the cosmic microwave background (CMB) including the B-mode polarization produced by CMB lensing using the Planck satellite, and baryon acoustic oscillations distance scale and the galaxy power spectrum from all-sky galaxy redshift survey in the BigBOSS experiment. We estimate the error in the bound on the total neutrino mass to be ΔΣmv = 0.012 eV with a 68% confidence level. If the fiducial value of the total neutrino mass is Σmv = 0.06 eV, this result implies that the neutrino mass hierarchy must be normal. © 2014 AIP Publishing LLC.

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