Duality in String Field Theory
Project/Area Number  09640346 
Research Category 
GrantinAid for Scientific Research (C).

Section  一般 
Research Field 
素粒子・核・宇宙線

Research Institution  KYOTO UNIVERSITY 
Principal Investigator 
HATA Hiroyuki Kyoto University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (70164837)

Project Fiscal Year 
1997 – 1999

Project Status 
Completed(Fiscal Year 1999)

Budget Amount *help 
¥2,600,000 (Direct Cost : ¥2,600,000)
Fiscal Year 1999 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1998 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1997 : ¥1,000,000 (Direct Cost : ¥1,000,000)

Keywords  superstring theory / string field theory / duality / Dbrane / BPS classical solution / monopole / Matrix model / noncommutative space / 超弦理論 / 弦の場の理論 / 双対性 / BPS古典解 / モノポール / 行列模型 / 非可換空間 / 弦理論 / string junction / 古典解 / 共形対称性 / BornInfeld作用 
Research Abstract 
The string duality has played important roles in the studies of nonperturbative structures of superstring theory. The present research project aims at understanding this string duality in the framework of string field theory, and at the same time, completing the construction of string field theory on the basis of duality. Concerning the treatment of Dbrane, which is the basic object for the duality structure of string theory, we have obtained a rather satisfactory results. However, much still remains to be clarified for the complete treatment duality structure using string field theory. As for other works concerning string duality, we have accomplished a number of satisfactory researches. The following is the concrete description of our researches. 1) Dbranes in Closed String Field Theory : We have introduced the Dbrane degrees of freedom into closed string field theory. By demanding the closed string gauge invariance, we have succeeded in determining the dependence of the boundary state on the Dbrane variable FィイD2μνィエD2 and the form of the kinetic term of FィイD2μνィエD2. 2) Construction of 1/4 BPS Solutions in Super YangMills Theories : String junction is a configuration of strings where the three strings emerging from three parallel D3branes meet at a point. We have succeeded in constructing classical solutions in supersymmetric YangMills theory which describes this string junction configuration. 3) Analysis of Conformal Symmetries in Matrix Model : It was known that the conformal symmetry in AdS spacetime emerges from super YangMills theory as a quantum effect. We have presented a complete analysis of this quantum conformal symmetry beyond the Eikonal approximation. 4) Construction of Classical Solutions in Super YangMills Theory in NonCommutative Space : We have constructed monopole and string junction classical solutions in supersymmetric YangMills theory in noncommutative space where the coordinates do not commute each other.

Report
(5results)
Research Output
(20results)