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42 papers
The Fokker-Planck formalism for closed bosonic strings
Nobuyuki Ishibashi
Every Riemann surface with genus and punctures admits a hyperbolic metric, if . Such a surface can be decomposed into pairs of pants whose boundaries are geodesic…
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 re…
Vector profile and gauge invariant observables of string field theory solutions for constant magnetic field background
Nobuyuki Ishibashi, Isao Kishimoto, Toru Masuda +1
We study profiles and gauge invariant observables of classical solutions corresponding to a constant magnetic field on a torus in open string field theory. We numerically find that…
Multiloop Amplitudes of Light-cone Gauge Superstring Field Theory: Odd Spin Structure Contributions
Nobuyuki Ishibashi, Koichi Murakami
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 confor…
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 world…
String field theory solution corresponding to constant background magnetic field
Nobuyuki Ishibashi, Isao Kishimoto, Tomohiko Takahashi
Following the method recently proposed by Erler and Maccaferri, we construct solutions to the equation of motion of Witten's cubic string field theory, which describe constant magn…