摘要:

It is reviewed how space-time supersymmetry is realized nonlinearly in open superstring theory without making the GSO projection. We show that the world-sheet string dualities, viz. dualities of open-closed strings and of open-open strings, play crucial roles for the existence of 10 dimensionalN=2supersymmetry in a spontaneously broken phase. We also speculate on a possible mechanism of the restoration of supersymmetry from the viewpoint of world-sheet dynamics. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454382

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

We discuss the basic ideas of vacuum string field theory, its successes in reproducing D-brane tensions, allowing analytic solutions and opening up the investigation of projectors, as well as the present open questions, relating to the ghost sector and the appearance of closed strings. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454383

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Supersymmetry dictates that the moduli space of Calabi-Yau 3-fold compactifications of type II superstring theory is an ordinary (commutative) space. However when one uses D-brane probes to measure the moduli of a particular compactification, one must break this supersymmetry. Using perturbative string theory we show that the measurement of any modulus affects other moduli, leading to an uncertainty principle and hence noncommutativity on moduli space. Furthermore we see that this effect only applies to measurements of moduli in finite regions of space. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454384

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

The behaviors of the scalar field with negative mass squared are studied in the five dimensional AdS space where the Randall-Sundrum brane-world is embedded. We point out that the tachyonic scalar allowed in the bulk space is trapped on the brane as a four dimensional tachyon. This would cause an instability of the brane since it has Minkowski space-time. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454385

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

D-branes inAdS3are studied by CFT approach. We first analyze by free field formulation and find that there is a conformal symmetry on D-branes. Then we construct boundary states based on discrete series which are consistent with open-closed duality and unitarity of spectrum. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454386

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

A solution with the pole configuration in six dimensions is analyzed. It is a dimensional reduction model of Randall-Sundrum type. The soliton configuration is induced by the bulk Higgs mechanism. The boundary condition is systematically solved up to the 6th order. The Riemann curvature is finite everywhere. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454387

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

We proposed a kinematical method to estimate the largeNdependences of correlation functions of the bosonic IIB matrix model. We calculate several correlation functions of the bosonic IIB matrix model using Monte Carlo simulation. We also pointed out the possibility that the largeNbehavior of the correlation functions are different from those of the regularized Schild model. We calculate theNdependences of some correlation functions by Monte Carlo simulation to compare with the IIB matrix model. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454388

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

We report an attempt of deriving a string representation of QCD based on a novel vacuum condensate of mass dimension 2. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454389

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Using the AdS/CFT correspondence we study UV behavior of Wilson loops in various noncommutative gauge theories. We get an area law in most cases and try to identify its origin. In D3 case, we may identify the origin as the D1 dominance over the D3: as we go to the boundary of the AdS space, the effect of the flux of the D3 charge is highly suppressed, while the flux due to the D1 charge is enhanced. So near the boundary the theory is more like a theory on D1 brane than that on D3 brane. This phenomena is closely related to the dimensional reduction due to the strong magnetic field in the charged particle in the magnetic field. The linear potential is not due to the confinement by IR effect but is the analogue of Coulomb’s potential in1+1dimension. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454390

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

We discuss deformation quantization of the Ka¨hler coset space by using the Fedosov formalism. Explicit calculations show that the Killing potentials of the Ka¨hler coset space satisfy the fuzzy algebrae. We also discuss the reduction of the ⋆ product to the Moyal product by taking appropriate Darboux coordinate, and the invariance by canonical and symplectic transformations. This respect of the ⋆ product is explained by studying the fuzzy algebrae of the Ka¨hler coset space. ©2002 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1454391

出版商:AIP    

年代:1902

数据来源: AIP