Ghost story. II. The midpoint ghost vertex (2009)
Bonora, L., Maccaferri, C., Santos, R. J. Scherer, Tolla, D. D.
We construct the ghost number 9 three strings vertex for OSFT in the natural normal ordering. We find two versions, one with a ghost insertion at z=i and a twist-conjugate one with insertion at z=-i....
Ghost story. III. Back to ghost number zero (2009)
Bonora, L., Maccaferri, C., Tolla, D. D.
After having defined a 3-strings midpoint-inserted vertex for the bc system, we analyze the relation between gh=0 states (wedge states) and gh=3 midpoint duals. We find explicit and regular relations...
Coupling between M2-branes and Form Fields (2009)
Kim, Yoonbai, Kwon, O-Kab, Nakajima, Hiroaki, Tolla, D. D.
In the context of low-energy effective theory of multiple M2-branes, we construct the interaction terms between the world-volume fields of M2-branes and the antisymmetric tensor fields of three- and...
Tachyon Vacuum Solution in Open String Field Theory with Constant B Field (2008)
Ishida, Akira, Kim, Chanju, Kim, Yoonbai, Kwon, O-Kab, Tolla, D. D.
We show that Schnabl's tachyon vacuum solution is an exact solution of the equation of motion of Witten's open bosonic string field theory in the background of constant antisymmetric two-form field....
Spectral properties of ghost Neumann matrices (2008)
Bonora, L., Santos, R. J. Scherer, Tolla, D. D.
We continue the analysis of the ghost wedge states in the oscillator formalism by studying the spectral properties of the ghost matrices of Neumann coefficients. We show that the traditional spectral...
Marginal Deformations as Lower Dimensional D-brane Solutions in Open String Field theory (2007)
Lee, Bum-Hoon, Park, Chanyong, Tolla, D. D.
By direct calculation we showed that a finite analytic solution for marginal deformation of open string field theory, by a matter primary operator with singular OPE, can be obtained to all orders in...
Ghost story. I. Wedge states in the oscillator formalism (2007)
Bonora, L., Maccaferri, C., Santos, R. J. Scherer, Tolla, D. D.
This paper is primarily devoted to the ghost wedge states in string field theory formulated with the oscillator formalism. Our aim is to prove, using such formalism, that the wedge states can be...
Bubbling AdS and Vacuum String Field Theory (2006)
Bonora, L., Maccaferri, C., Santos, R. J. Scherer, Tolla, D. D.
We show that a family of 1/2--BPS states of $\N=4$ SYM is in correspondence with a family of classical solutions of VSFT with a $B$--field playing the role of the inverse Planck constant. We show...
Light-cone Superstring Field Theory, pp-wave background and integrability properties (2005)
Bonora, L., Santos, R. J. Scherer, Sorin, A. S., Tolla, D. D.
We show that the three strings vertex coefficients in light--cone open string field theory satisfy the Hirota equations for the dispersionless Toda lattice hierarchy. We show that Hirota equations...
Fundamental strings in SFT (2005)
Bonora, L., Maccaferri, C., Santos, R. J. Scherer, Tolla, D. D.
In this letter we show that vacuum string field theory contains exact solutions that can be interpreted as macroscopic fundamental strings. They are formed by a condensate of infinitely many...
Time-localized projectors in String Field Theory with E-field (2005)
Maccaferri, C., Santos, R. J. Scherer, Tolla, D. D.
We extend the analysis of hep-th/0409063 to the case of a constant electric field turned on the worldvolume and on a transverse direction of a D-brane. We show that time localization is still...
Exact time-localized solutions in Vacuum String Field Theory (2004)
Bonora, L., Maccaferri, C., Santos, R. J. Scherer, Tolla, D. D.
We address the problem of finding star algebra projectors that exhibit localized time profiles. We use the double Wick rotation method, starting from an Euclidean (unconventional) lump solution,...