scholarly journals Exact results on equations of motion in vacuum string field theory

2005 ◽  
Vol 631 (3) ◽  
pp. 141-149
Author(s):  
Hiroyuki Hata ◽  
Sanefumi Moriyama
Keyword(s):  
Field Theory ◽  
String Field Theory ◽  
Equations Of Motion ◽  
Exact Results

scholarly journals Analytic construction of multi-brane solutions in cubic string field theory for any brane number

2019 ◽  
Vol 2019 (8) ◽  
Author(s):  
Hiroyuki Hata
Keyword(s):  
Field Theory ◽  
String Field Theory ◽  
Equations Of Motion ◽  
Open String ◽  
Three Dimensions ◽  
Simons Theory ◽  
Analytic Construction ◽  
Pure Gauge ◽  
Brane Solution ◽  
Chern Simons

Abstract We present an analytic construction of multi-brane solutions with any integer brane number in cubic open string field theory (CSFT) on the basis of the ${K\!Bc}$ algebra. Our solution is given in the pure-gauge form $\Psi=U{Q_\textrm{B}} U^{-1}$ by a unitary string field $U$, which we choose to satisfy two requirements. First, the energy density of the solution should reproduce that of the $(N+1)$-branes. Second, the equations of motion (EOM) of the solution should hold against the solution itself. In spite of the pure-gauge form of $\Psi$, these two conditions are non-trivial ones due to the singularity at $K=0$. For the $(N+1)$-brane solution, our $U$ is specified by $[N/2]$ independent real parameters $\alpha_k$. For the 2-brane ($N=1$), the solution is unique and reproduces the known one. We find that $\alpha_k$ satisfying the two conditions indeed exist as far as we have tested for various integer values of $N\ (=2, 3, 4, 5, \ldots)$. Our multi-brane solutions consisting only of the elements of the ${K\!Bc}$ algebra have the problem that the EOM is not satisfied against the Fock states and therefore are not complete ones. However, our construction should be an important step toward understanding the topological nature of CSFT, which has similarities to the Chern–Simons theory in three dimensions.

scholarly journals Some exact results on tachyon condensation in string field theory

2000 ◽  
Vol 2000 (10) ◽  
pp. 045-045 ◽  
Author(s):  
David Kutasov ◽  
Marcos Mariño ◽  
Gregory Moore
Keyword(s):  
Field Theory ◽  
String Field Theory ◽  
Tachyon Condensation ◽  
Exact Results

scholarly journals Conformal defects from string field theory

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Kasia Budzik ◽  
Miroslav Rapčák ◽  
Jairo M. Rojas
Keyword(s):  
Field Theory ◽  
String Field Theory ◽  
Topological Defect ◽  
Equations Of Motion ◽  
Open String ◽  
Minimal Models ◽  
Model Case ◽  
Conformal Boundary ◽  
Boundary State ◽  
Space Approach

Abstract Unlike conformal boundary conditions, conformal defects of Virasoro minimal models lack classification. Alternatively to the defect perturbation theory and the truncated conformal space approach, we employ open string field theory (OSFT) techniques to explore the space of conformal defects. We illustrate the method by an analysis of OSFT around the background associated to the (1, 2) topological defect in diagonal unitary minimal models. Numerical analysis of OSFT equations of motion leads to an identification of a nice family of solutions, recovering the picture of infrared fixed points due to Kormos, Runkel and Watts. In particular, we find a continuum of solutions in the Ising model case and 6 solutions for other minimal models. OSFT provides us with numerical estimates of the g-function and other coefficients of the boundary state.

String field theory and equations of motion

1986 ◽  
Vol 178 (4) ◽  
pp. 343-349 ◽  
Author(s):  
Neil Marcus ◽  
Augusto Sagnotti
Keyword(s):  
Field Theory ◽  
String Field Theory ◽  
Equations Of Motion

Pure gauge configurations and tachyon solutions for cubic fermionic string field theory equations of motion

2009 ◽  
Vol 161 (1) ◽  
pp. 1376-1384
Author(s):  
I. Ya. Aref’eva ◽  
R. V. Gorbachev ◽  
D. A. Grigoryev ◽  
P. N. Khromov ◽  
P. B. Medvedev
Keyword(s):  
Field Theory ◽  
String Field Theory ◽  
Equations Of Motion ◽  
Pure Gauge ◽  
Fermionic String

scholarly journals REFORMULATION OF BOUNDARY STRING FIELD THEORY IN TERMS OF BOUNDARY STATE

2008 ◽  
Vol 23 (14n15) ◽  
pp. 2281-2282
Author(s):  
SHUNSUKE TERAGUCHI
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
String Field Theory ◽  
International Workshop ◽  
Equations Of Motion ◽  
Target Space ◽  
Arbitrary Field ◽  
Quantum Field ◽  
Boundary State ◽  
Short Summary

We reformulate bosonic boundary string field theory in terms of boundary state. In our formulation, we can formally perform the integration of target space equations of motion for arbitrary field configurations without assuming decoupling of matter and ghost. This is a short summary of our contribution to the international workshop "Progress of String Theory and Quantum Field Theory" at Osaka City University (December 7-10, 2007).

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