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We present a holographic dual of four-dimensional, large Nc QCD with massless flavors. This model is constructed by placing N f probe D8-branes into a D4 background, where supersymmetry is completely broken. The chiral symmetry breaking in QCD is manifested as a smooth interpolation of D8-D8 pairs in the supergravity background. The meson spectrum is… (More)

We investigate the interactions among the pion, the vector mesons and the external gauge fields in the holographic dual of massless QCD proposed in our previous paper [1] on the basis of probe D8-branes embedded into a D4-brane background in type IIA string theory. We obtain the coupling constants by performing both analytic and numerical calculation, and… (More)

A great variety of computer vision tasks, such as rigid/nonrigid structure from motion and photometric stereo , can be unified into the problem of approximating a low-rank data matrix in the presence of missing data and out-liers. To improve robustness, the L 1-norm measurement has long been recommended. Unfortunately, existing methods usually fail to… (More)

We study the late time behavior of the boundary state representing the rolling tachyon constructed by Sen. It is found that the coupling of the rolling tachyon to massive modes of the closed string grows exponentially as the system evolves. We argue that the description of rolling tachyon by a boundary state is valid during the finite time determined by… (More)

- Shigeki Sugimoto, Seiji Terashima, Sung-Kil Yang
- 2002

We analyse the classical decay process of unstable D-branes in superstring theory using the boundary string field theory (BSFT) action. We show that the solutions of the equations of motion for the tachyon field asymptotically approach to T = x 0 and the pressure rapidly falls off at late time producing the tachyon matter irrespective of the initial… (More)

We consider aspects of dynamical baryons in a holographic dual of QCD that is proposed on the basis of a D4/D8-brane configuration. We construct a soliton solution carrying a unit baryon number and show that it is given by an instanton solution of four-dimensional Yang-Mills theory with fixed size. The Chern-Simons term on the flavor D8-branes plays a… (More)

In this paper, we revisit the classical perspective-n-point (PnP) problem, and propose the first non-iterative O(n) solution that is fast, generally applicable and globally optimal. Our basic idea is to formulate the PnP problem into a functional minimization problem and retrieve all its stationary points by using the Gröbner basis technique. The novelty… (More)

- Shigeki Sugimoto
- 2003

abstract We study the decay of unstable Dp-branes when the world-volume gauge field is turned on. We obtain the relevant Dp-brane boundary state with electric and magnetic fields by boosting and rotating the rolling tachyon boundary state of a D(p − 1)-brane and then T-dualizing along one of the transverse directions. A simple recipe to turn on the gauge… (More)

- Shigeki Sugimoto
- 1999

We check some consistency conditions for the D9-D9 system in type I string theory. The gravitational anomaly and gauge anomaly for SO(n) × SO(m) gauge symmetry are shown to be cancelled when n − m = 32. In addition, we find that a string theory with U Sp(n) × U Sp(m) gauge symmetry also satisfies the anomaly cancellation conditions. After tachyon… (More)

- Tsuguhiko Asakawa, Shigeki Sugimoto, Seiji Terashima
- 2008

In this paper, we study a new matrix theory based on non-BPS D-instantons in type IIA string theory and D-instanton-anti D-instanton system in type IIB string theory, which we call K-matrix theory. The theory correctly incorporates the creation and anihi-lation processes of D-branes. The configurations of the theory are identified with spectral triples,… (More)