Nobuyuki Ishibashi

Strebel differentials and string field theory

Nobuyuki Ishibashi

A closed string worldsheet of genus $g$ with $n$ punctures can be presented as a contact interaction in which $n$ semi-infinite cylinders are glued together in a specific way via the Strebel differential on it, if $n\geq1,\ 2g-2+n>0$. We construct a string …

The Fokker–Planck formalism for closed bosonic strings

Nobuyuki Ishibashi

Abstract Every Riemann surface with genus g and n punctures admits a hyperbolic metric, if 2g − 2 + n > 0. Such a surface can be decomposed into pairs of pants whose boundaries are geodesics. We construct a string field theory …

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Multiloop Amplitudes of Light-cone Gauge String Field Theory for Type II Superstrings

Nobuyuki Ishibashi

Feynman amplitudes of light-cone gauge string field theory for Type II superstrings are shown to be equivalent to those of the covariant first quantized formulation. In order to regularize the contact term divergences, we consider the theory in a linear dilaton background …

Multiloop amplitudes of light-cone gauge superstring field theory: odd spin structure contributions

Nobuyuki Ishibashi, Koichi Murakami

Abstract We study the odd spin structure contributions to the multiloop amplitudes of light-cone gauge superstring field theory. We show that they coincide with the amplitudes in the conformal gauge with two of the vertex operators chosen to be in the pictures …

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6 Λ H探索のための 6 Li(π - ,K + )X反応を用いたミッシングマス分光法

R. Honda, M. Agnello, J. K. Ahn, S. Ajimura et autres

Multiloop amplitudes of light-cone gauge NSR string field theory in noncritical dimensions

Nobuyuki Ishibashi, Koichi Murakami

Feynman amplitudes of light-cone gauge superstring field theory are ill-defined because of various divergences. In a previous paper, one of the authors showed that taking the worldsheet theory to be the one in a linear dilaton background Φ = −iQX 1 with …

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Dipolar quantization and the infinite circumference limit of two-dimensional conformal field theories

Nobuyuki Ishibashi, Tsukasa Tada

Elaborating on our previous presentation, where the term dipolar quantization was introduced, we argue here that adopting [Formula: see text] as the Hamiltonian instead of [Formula: see text] yields an infinite circumference limit in two-dimensional conformal field theory. The new Hamiltonian leads …

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Light-cone Gauge NSR Strings in Noncritical Dimensions

Yutaka Baba, Nobuyuki Ishibashi, Koichi Murakami

Light-cone gauge NSR string theory in noncritical dimensions should correspond to a string theory with a nonstandard longitudinal part. Supersymmetrizing the bosonic case [1], we formulate a superconformal worldsheet theory for the longitudinal variables X ±, ψ ±. We show that with …

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Worldsheet theory of light-cone gauge noncritical strings on higher genus Riemann surfaces

Nobuyuki Ishibashi, Koichi Murakami

It is possible to formulate light-cone gauge string field theory in noncritical dimensions. Such a theory corresponds to conformal gauge worldsheet theory with nonstandard longitudinal part. We study the longitudinal part of the worldsheet theory on higher genus Riemann surfaces. The results …

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Light-cone gauge strings on higher genus Riemann surfaces in noncritical dimensions

Nobuyuki Ishibashi, Koichi Murakami

It is possible to formulate light-cone gauge string field theory in noncritical dimensions. Such a theory corresponds to conformal gauge worldsheet theory with nonstandard longitudinal part. We study the longitudinal part of the worldsheet theory on higher genus Riemann surfaces. The results …

Comments on Takahashi-Tanimoto’s scalar solution

Nobuyuki Ishibashi

We study the identity-based solution of Witten’s cubic bosonic open string field theory constructed by Takahashi and Tanimoto, which is claimed to describe the tachyon vacuum. We argue that the observables of the solution coincide with those of the tachyon vacuum using …

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Study onΛ6H hypernucleus by the (π−,K+) reaction at J-PARC

Hitoshi Sugimura, M. Agnello, J. K. Ahn, S. Ajimura et autres

We carried out an experiment to produce the neutron-rich hypernucleus Λ6H via the (π−, K+) reaction on 6Li target at the pion beam momentum of 1.2 GeV/c (J-PARC E10). In order to calibrate the scale of the missing-mass or of the Λ …

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