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Holomorphic anomaly of 2d Yang-Mills theory on a torus revisited [article]

Kazumi Okuyama, Kazuhiro Sakai
2019 arXiv   pre-print
We study the large N 't Hooft expansion of the chiral partition function of 2d U(N) Yang-Mills theory on a torus.  ...  In this paper we focus on the case where the target space is a torus T 2 .  ...  Our construction is based on the chiral boson interpretation of the 2d Yang-Mills theory on a torus.  ... 
arXiv:1903.10510v1 fatcat:3bhn6kzmibf3xm7cynjgibvfua

Vacuum Energies of String Compactified on Torus

N. Sakai, I. Senda
1987 Progress of theoretical physics  
For one-dimensional torus, the affine Kac-Moody algebra for 5U(2) x 5U(2) is realized at the absolute minimum of the vacuum energy.  ...  For general r-dimensional torus, the algebra for [5 U (2) x 5 U (2) 1 r is found to be an unstable saddle point. A detailed study of r=2 case shows that 5U(3) x 5U(3) has the lowest vacuum energy.  ...  Sakai and 1.  ... 
doi:10.1143/ptp.77.773 fatcat:5ipjguc2cbduvlbxhdwu6qhqlm

Vacuum Energies of String Compactified on Torus

N. Sakai, I. Senda
1986 Progress of theoretical physics  
For one-dimensional torus, the affine Kac-Moody algebra for 5U(2) x 5U(2) is realized at the absolute minimum of the vacuum energy.  ...  For general r-dimensional torus, the algebra for [5 U (2) x 5 U (2) 1 r is found to be an unstable saddle point. A detailed study of r=2 case shows that 5U(3) x 5U(3) has the lowest vacuum energy.  ...  Sakai and 1.  ... 
doi:10.1143/ptp.75.692 fatcat:op63p5ahzzf2ti55lwdxfiuhsi

The Editorial Preface

Hitoshi Ohta, Toru Sakai
2021 Applied Magnetic Resonance  
Sakai, and M. Matsumoto.  ...  Sakai, EPR theories for selection rules to observe the spin gap. Original paper: M.  ... 
doi:10.1007/s00723-021-01329-y fatcat:ivwa7flo7valfk22ys5buingnq

Enhanced Transverse-Flux Motor with Torus Coils

Junya Tanaka, Kazuto Sakai
2015 IEEJ Journal of Industry Applications  
The rotor comprises radially magnetized permanent magnets, and the stator comprises torus coils and axial 9-shaped cores.  ...  Thus, to obtain a motor at low cost with high reliability, we investigated a transverse-flux motor (TFM) containing a torus coil.  ...  In this study, our proposed machine can arrange twice the number of separated stator cores as conventional TFMs by using a 9-shaped core a) Correspondence to: Kazuto Sakai.  ... 
doi:10.1541/ieejjia.4.418 fatcat:4ci2ust23zb5tfacqacl377ktm

Resurgence analysis of 2d Yang-Mills theory on a torus

Kazumi Okuyama, Kazuhiro Sakai
2018 Journal of High Energy Physics  
We study the large N 't Hooft expansion of the partition function of 2d U(N) Yang-Mills theory on a torus.  ...  (B.2) 2. 1 1 Partition function of Yang-Mills on T 2Let us first review the partition function of 2d Yang-Mills on a torus and its connection to topological string.  ...  As discussed in [1] , this expectation is realized in a concrete example of the equality between the partition function Z N of 2d U(N ) Yang-Mills theory on a torus and that of four dimensional BPS black  ... 
doi:10.1007/jhep08(2018)065 fatcat:qv5fa7zwvbfvzmpjh4ig5l5nue

Holomorphic anomaly of 2d Yang-Mills theory on a torus revisited

Kazumi Okuyama, Kazuhiro Sakai
2019 Journal of High Energy Physics  
We study the large N 't Hooft expansion of the chiral partition function of 2d U(N ) Yang-Mills theory on a torus.  ...  In this paper we focus on the case where the target space is a torus T 2 . The genus expansion of the partition function of 2d U(N ) Yang-Mills theory on a torus has been studied in detail [8, 24] .  ...  Our construction is based on the chiral boson interpretation of the 2d Yang-Mills theory on a torus.  ... 
doi:10.1007/jhep08(2019)025 fatcat:sqxdn5osvfgj3gqvhea6rks7jy

Magnetization Plateau of the Distorted Diamond Spin Chain [article]

Yuki Ueno, Tomosuke Zenda, Yuta Tachibana, Kiyomi Okamoto, Tôru Sakai
2019 arXiv   pre-print
The frustrated quantum spin system on the distorted diamond chain lattice is investigated using the numerical diagonalization of finite-size clusters and the level spectroscopy analysis. In the previous work this system was revealed to exhibit the 1/3 magnetization plateau due to two different mechanisms depending on the coupling parameters, and the phase diagram at the 1/3 magnetization was obtained. In the present work it is found that the 1/3 magnetization plateau vanishes for sufficiently
more » ... rge XY-like coupling anisotropy. The phase diagram based on the level spectroscopy analysis is also presented.
arXiv:1910.02585v1 fatcat:eocxg53rfbag3afgpox2cm5tmy

Quantum Phase Transition of the Twisted Spin Tube [article]

Yuta Tachibana, Yuki Ueno, Tomosuke Zenda, Kiyomi Okamoto, Toru Sakai
2019 arXiv   pre-print
The S=1/2 twisted three-leg spin tube with the lattice distortion from the regular triangle to the isosceles one is investigated using the numerical diagonalization of finite-size clusters and the phenomenological renormalization group analysis. It is found that the quantum phase transition occurs from the spin gap phase to another one with respect to this lattice distortion.
arXiv:1910.02587v1 fatcat:moog6hbclnfyjaba22q5tqkyg4

Spin Nematic Liquids of the S=1 Spin Ladder in Magnetic Field [article]

Tôru Sakai, Kiyomi Okamoto
2019 arXiv   pre-print
Sakai and M. Takahashi, Phys. Rev. B 43, 13383 (1991). 6 T. Sakai and M. Takahashi, J. Phys. Soc. Jpn. 60, 3615 (1991).  ...  Sakai, S. Jonas, C. Broholm, H. Tsunetsugu, Y. Qiu and Y. Maeno, Science 309, 1697 (2005). 3 R. Yamanokuchi, K. Okamoto and T.  ... 
arXiv:1910.02582v1 fatcat:yzmyvzggijfvloe3epsdu3p5ya

Quantum Phase Transitions of the Distorted Diamond Spin Chain [article]

Tomosuke Zenda, Yuta Tachibana, Yuki Ueno, Kiyomi Okamoto, Tôru Sakai
2019 arXiv   pre-print
The frustrated quantum spin system on the distorted diamond chain lattice suitable for the alumoklyuchevskite is investigated using the numerical diagonalization of finite-size clusters and the level spectroscopy analysis. It is found that this model exhibits three quantum phases; the ferrimagnetic phase, the spin gap one, and the gapless Tomonaga-Luttinger liquid depending on the exchange coupling parameters. The ground state phase diagram is presented.
arXiv:1911.06539v1 fatcat:fj7hkmmexfakhimemkec3lbqny

Integral Geometry and Hamiltonian volume minimizing property of a totally geodesic Lagrangian torus in S^2 times S^2 [article]

Hiroshi Iriyeh, Hajime Ono, Takashi Sakai
2003 arXiv   pre-print
Let L := S 1 × S 1 be a totally geodesic Lagrangian torus in (S 2 ×S 2 , ω 0 ⊕ω 0 ), where ω 0 denotes the standard Kähler form of S 2 (1) ∼ = CP 1 .  ...  Hence we can define the isotropy invariant by a coordinate of a maximal torus. We denote by g ′ and k ′ the Lie algebra of G ′ and K ′ , respectively.  ... 
arXiv:math/0310432v2 fatcat:dg6y3i7mlrdozkdn635lpwkg2y

Novel Quantum Phase Transition in the Frustrated Spin Nanotube

Toru Sakai, Hiroki Nakano
2015 Physics Procedia  
The S=1/2 three-leg quantum spin tube is investigated using the numerical diagonalization. The study indicated a new quantum phase transition between the 1/3 magnetization plateau phase and the plateauless one, with respect to the spin anisotropy. The phase diagram is also presented.
doi:10.1016/j.phpro.2015.12.200 fatcat:c4trbd7wsbgbho3nepgacxuaru

Nuclear expression of claudin‑3 in human colorectal adenocarcinoma cell lines and tissues

Yasunori Tokuhara, Tatsuya Morinishi, Toru Matsunaga, Manabu Sakai, Takayoshi Sakai, Hiroyuki Ohsaki, Kyuichi Kadota, Yoshio Kushida, Reiji Haba, Eiichiro Hirakawa
2017 Oncology Letters  
Claudins are members of a large family of transmembrane proteins, which are essential for the formation of tight junctions and have a significant effect on the biological behavior of tumor progression. Previous studies have demonstrated that several claudins show aberrant expression patterns in numerous types of cancer. The present study investigated the expression and localization of claudin-3 and claudin-7 in human colorectal adenocarcinoma cell lines and tissues. The protein expression
more » ... of claudin-3 and claudin-7 were determined using immunocytochemical and immunohistochemical staining. Claudin-3, but not claudin-7, exhibited nuclear localization in the human colorectal adenocarcinoma Caco-2 and SW620 cell lines. Surgically resected colorectal adenocarcinoma tissue specimens were obtained, and the associations between the expression of claudin-3 or claudin-7 and various clinicopathological parameters were analyzed. The membranous expression rates of claudin-3 and claudin-7 were 58.0 and 50.0%, while their nuclear expression rates were 22.0 and 2.0%, respectively. The membranous expression of claudin-3 and claudin-7 was not associated with any clinicopathological factors, whereas the nuclear expression of claudin-3 was associated with histological type and was significantly increased in colorectal mucinous adenocarcinomas compared with that in well-to moderately-differentiated colorectal adenocarcinomas (P<0.01). However, no associations were observed between the nuclear expression of claudin-7 and any clinicopathological parameter. In conclusion, the nuclear expression of claudin-3 in colorectal mucinous adenocarcinoma may be involved in the biological transformation of tumors. The results from the present study indicated that claudin-3 is an important protein associated with histological type and has potential as a prognostic marker. Although the mechanisms underlying the nuclear localization of claudin-3 in tumorigenesis have not yet been elucidated in detail, the present results indicated the potential of claudin-3 as a histopathological biomarker for colorectal adenocarcinomas.
doi:10.3892/ol.2017.7281 pmid:29285188 pmcid:PMC5738677 fatcat:bekzo5hrkndjhiwit3ixtz5c4m

Resection of Pulmonary Metastasis of Non-small Cell Lung Cancer

Kenichi Okubo, Toru Bando, Ryo Miyahara, Hiroaki Sakai, Tsuyoshi Shoji, Makoto Sonobe, Takuji Fujinaga, Kiyoshi Sato, Hiromi Wada, Toru Tanaka
2009 Journal of Thoracic Oncology  
Management of pulmonary metastasis of non-small cell lung cancer (NSCLC) remains controversial. We reviewed our surgical treatment for pulmonary metastasis of NSCLC. Methods: Seventy-six patients with pulmonary metastasis of NSCLC underwent pulmonary resections in two institutes during the past 10 years. Eighteen patients with simultaneous same lobe metastasis as the primary lesion underwent mostly lobectomies. Sixteen patients with simultaneous different lobe metastasis underwent combined
more » ... n-free resections. Forty-nine pulmonary metastasectomies were performed in 42 patients with recurrent lung cancer. Overall survival and disease-free survival in each group were examined, and factors affecting survivals were investigated. Results: In the patients with the same lobe metastasis 5-year survival was 79.6%, and median and 5-year disease-free survivals were 39.1 months and 41.3%. In the patients with simultaneous different lobe metastasis median survival and 5-year survival were 37.7 months and 30.7%, and median and 5-year disease-free survivals were 13.3 months and 12.5%, respectively. Multiple pulmonary metastasis and mediastinal node metastasis were identified as significant factors affecting survivals. In the patients with recurrent pulmonary metastasis median survival and 5-year survival were 40.0 months and 34.8%, and median and 5-year disease-free survivals were 23.7 months and 14.4%, respectively. Node metastasis, higher age, and shorter interval from the prior resection were identified as significant factors affecting survivals. Conclusions: These findings suggest that the simultaneous same lobe metastasis is under the same indication for the primary lesion, and that the simultaneous different lobe metastasis and recurrent pulmonary metastasis should be removed in selected patients.
doi:10.1097/jto.0b013e3181949c6a pmid:19179897 fatcat:6vii7xjw7jdg3f6atnhxnwxvia
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