scholarly journals Tachyon condensation on a nonstationaryDp-brane with background fields in superstring theory

2014 ◽  
Vol 90 (10) ◽  
Author(s):  
F. Safarzadeh-Maleki ◽  
D. Kamani
Keyword(s):  
Tachyon Condensation ◽  
Superstring Theory ◽  
Background Fields

scholarly journals Brane with transverse rotation and background fields: boundary state and tachyon condensation

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Davoud Kamani
Keyword(s):  
String Theory ◽  
Tachyon Condensation ◽  
Internal Field ◽  
Open String ◽  
Bosonic String ◽  
Boundary State ◽  
Bosonic String Theory ◽  
Transverse Rotation ◽  
Background Fields

Abstract The boundary state corresponding to the Dp-brane with a transverse rotation in the presence of the Kalb–Ramond and tachyon background fields and a U(1) internal field will be constructed. We shall investigate effects of the open string tachyon condensation on this brane via its boundary state. We demonstrate that the background fields and transverse rotation cannot protect the brane against the collapse. Our calculations are in the context of the bosonic string theory.

scholarly journals EXCITED D-BRANES AND SUPERGRAVITY SOLUTIONS

2006 ◽  
Vol 21 (07) ◽  
pp. 1503-1527
Author(s):  
TSUGUHIKO ASAKAWA ◽  
SO MATSUURA ◽  
SHINPEI KOBAYASHI
Keyword(s):  
Boundary Condition ◽  
General Solution ◽  
Tachyon Condensation ◽  
Type Ii ◽  
Superstring Theory ◽  
Open Strings ◽  
Boundary State

We investigate the general solution with the symmetry ISO (1, p) × SO (9-p) of Type II supergravity (the three-parameter solution) from the viewpoint of the superstring theory. We find that one of the three parameters (c1) is closely related to the "dilaton charge" and the appearance of the dilaton charge is a consequence of deformations of the boundary condition from that of the boundary state for BPS D-branes. We give three examples of the deformed D-branes by considering the tachyon condensation from systems of [Formula: see text]-branes, unstable D9-branes and unstable D-instantons to the BPS saturated D p-branes, respectively. We argue that the deformed systems are generally regarded as tachyonic and/or massive excitations of the open strings on [Formula: see text]-brane systems.

scholarly journals Tachyon condensation in magnetic compactifications

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Wilfried Buchmuller ◽  
Emilian Dudas ◽  
Yoshiyuki Tatsuta
Keyword(s):  
Ground State ◽  
Particle Physics ◽  
Tachyon Condensation ◽  
Quantum Corrections ◽  
Type I ◽  
Local Minima ◽  
Superstring Theory ◽  
Dual Version ◽  
Brane Models ◽  
Kaluza Klein

Abstract Intersecting D-brane models and their T-dual magnetic compactifications provide an attractive framework for particle physics, allowing for chiral fermions and supersymmetry breaking. Generically, magnetic compactifications have tachyons that are usually removed by Wilson lines. However, quantum corrections prevent local minima for Wilson lines. We therefore study tachyon condensation in the simplest case, the magnetic compactification of type I string theory on a torus to eight dimensions. We find that tachyon condensation restores supersymmetry, which is broken by the magnetic flux, and we compute the Kaluza-Klein mass spectrum. The gauge group SO(32) is broken to USp(16). We give arguments that the vacuum reached by tachyon condensation corresponds to the unique 8d superstring theory already known in the literature, with discrete Bab background or, in the T-dual version, the type IIB orientifold with three O7−-planes, one O7+-plane and eight D7-branes coincident with the O7+-plane. The ground state after tachyon condensation is supersymmetric and has no chiral fermions.

N=2 SUPERSTRING THEORY GENERATES SUPERSYMMETRIC CHERN-SIMONS THEORIES

1994 ◽  
Vol 09 (35) ◽  
pp. 3255-3266 ◽  
Author(s):  
HITOSHI NISHINO
Keyword(s):  
Integrable Models ◽  
Three Dimensions ◽  
Superstring Theory ◽  
Four Dimensions ◽  
Yang Mills ◽  
Fundamental Significance ◽  
Background Fields ◽  
Chern Simons

We show that the action of self-dual supersymmetric Yang-Mills theory in four dimensions, which describes the consistent massless background fields for N=2 superstring, generates the actions for N=1 and N=2 supersymmetric non-Abelian Chern-Simons theories in three dimensions after some dimensional reductions. Since the latters play important roles for supersymmetric integrable models, this result indicates the fundamental significance of the N=2 superstring theory controlling (possibly all) supersymmetric integrable models in lower dimensions.

scholarly journals Advantage of the second-order formalism in double space T-dualization of type II superstring

2019 ◽  
Vol 79 (10) ◽  
Author(s):  
B. Nikolić ◽  
B. Sazdović
Keyword(s):  
Order Theory ◽  
Type Ii ◽  
Pure Spinor ◽  
Superstring Theory ◽  
First Order ◽  
First Order Theory ◽  
Double Space ◽  
Spinor Formulation ◽  
Space Formalism ◽  
Background Fields

Abstract In this article we present bosonic T-dualization in double space of the type II superstring theory in the pure spinor formulation. We use the action with constant background fields obtained from the general case under some physically and mathematically justified assumptions. Unlike Nikolić and Sazdović (EPJ C 77:197, 2017), where we used the first-order theory, in this article fermionic momenta are integrated out. Full T-dualization in double space is represented as a permutation of the initial $$x^\mu $$xμ and T-dual coordinates $$y_\mu $$yμ. Requiring that a T-dual transformation law of the T-dual double coordinate $${}^\star Z^M=(y_\mu ,x^\mu )$$⋆ZM=(yμ,xμ) to be of the same form as for initial one $$Z^M=(x^\mu ,y_\mu )$$ZM=(xμ,yμ), we obtain the form of the T-dual background fields in terms of the initial ones. The advantage of using the action with integrated fermionic momenta is that it gives all T-dual background fields in terms of the initial ones. In the case of the first-order theory Nikolić and Sazdović (2017) a T-dual R-R field strength was obtained out of the double space formalism under additional assumptions.

scholarly journals Interaction of dynamical fractional branes with background fields: Superstring calculations

2017 ◽  
Vol 32 (15) ◽  
pp. 1750069
Author(s):  
Maryam Saidy-Sarjoubi ◽  
Davoud Kamani
Keyword(s):  
Gauge Field ◽  
Space Time ◽  
Transverse Motion ◽  
Superstring Theory ◽  
Boundary State ◽  
Interaction Amplitude ◽  
Structure Formula ◽  
Background Fields

We compute the boundary state corresponding to a fractional Dp-brane with transverse motion and internal background fields: Kalb–Ramond and a U(1) gauge field. The space–time has the orbifold structure [Formula: see text]. The calculations are in the superstring theory. Using this boundary state we shall obtain the interaction amplitude between two parallel moving fractional Dp-branes. We shall extract behavior of the interaction amplitude for large distances of the branes.

Exact black five-branes in critical superstring theory

1991 ◽  
Vol 67 (21) ◽  
pp. 2930-2932 ◽  
Author(s):  
Steven B. Giddings ◽  
Andrew Strominger
Keyword(s):  
Superstring Theory
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