Quantum Theory of Extended Objects and Unification Theory
Project/Area Number  01540246 
Research Category 
GrantinAid for Scientific Research (C).

Research Field 
核・宇宙線・素粒子

Research Institution  Kyoto University 
Principal Investigator 
INAMI Takeo Kyoto Univ. Yukawa Inst. for Assoc. Prof. Theor. Phys., 基礎物理学研究所, 助教授 (20012487)

Project Fiscal Year 
1989 – 1990

Project Status 
Completed(Fiscal Year 1990)

Budget Amount *help 
¥1,200,000 (Direct Cost : ¥1,200,000)
Fiscal Year 1990 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1989 : ¥600,000 (Direct Cost : ¥600,000)

Keywords  Extended Object / String / Membrane / Areapreserving Diffeomorphisms / 拡がりを持った物体 / 弦理論 / 膜理論 / 弦模型 / membrane模型 / 統一理論 
Research Abstract 
The purpose of this research project was to study the quantum theory of extended objects as candidates for the unified theory. We focused on constructing a quantized theory of membranes and at the same time on deeper understanding of string models. We carried out both I) analysis of the mathematical properties of membranes and II) analysis of their physical properties such as the mass spectrum and quantum effects. I) In constructing quantum theory of membranes it is crucial to understand the gauge symmetries of the model. It has been known that the area preserving diffeomorphisms arises as the residual gauge invariance. This type of diffeomorphisms has recently been shown to be expressed in terms of an infinite dimensional algebra called W_* algebra (n>* limit of W_n algebra). Towards the supersymmetric extension of W_* algebra we have obtained the following results : a) Construction of Supersymmetric Generalization of W Algebras b) Construction of Supersymmetric Integrable Systems Associated with Super W Algebras c) Derivation of Super KP Hierarchy Based on Lie Superalgebras d) The Results a) c) were Generalized to the N=2 Symmetry Case. These results not only provide useful methods for analyzing supermembranes but also give a useful framework to deal with compactification of superstrings. II) Weyl invariance Plays a crucial role in quantum theory of strings. We have constructed a membrane model with Weyl invariance. We are now in the course of studying quantum effects in this theory. The result of this investigation is expected to have implications on threedimensional gravity as wel.

Report
(4results)
Research Output
(19results)