28,073 research outputs found
D-Brane Dynamics in Dp-Brane Background
By using Dirac-Born-Infeld action we study the real time dynamics of D-branes
in the vicinity of a stack of Dp-branes where the role of the tachyon of the
open string models is played by the radial mode on the D-branes. We examine the
behaviour of the tachyon potential and study the hamiltonian formulation and
classical solutions of such systems. We also study the homogeneous solutions of
the classical equations of motion in these cases.Comment: 14 pages, minor modifications, to appear in Phys. Lett.
Geometry versus Entanglement in Resonating Valence Bond Liquids
We investigate the behavior of bipartite as well as genuine multipartite
entanglement of a resonating valence bond state on a ladder. We show that the
system possesses significant amounts of bipartite entanglement in the steps of
the ladder while no substantial bipartite entanglement is present in the rails.
Genuine multipartite entanglement present in the system is negligible. The
results are in stark contrast with the entanglement properties of the same
state on isotropic lattices in two and higher dimensions, indicating that the
geometry of the lattice can have important implications on the quality of
quantum information and other tasks that can be performed by using multiparty
states on that lattice.Comment: 6 pages, 8 figures, RevTeX
D0-brane tension in string field theory
We compute the D0-brane tension in string field theory by representing it as
a tachyon lump of the D1-brane compactified on a circle of radius . To this
aim, we calculate the lump solution in level truncation up to level L=8. The
normalized D0-brane tension is independent on . The compactification radius
is therefore chosen in order to cancel the subleading correction . We
show that an optimal radius indeed exists and that at the
theoretical prediction for the tension is reproduced at the level of .
As a byproduct of our calculation we also discuss the determination of the
marginal tachyon field at .Comment: 13 pages, 3 Eps figure
D-Brane Probe and Closed String Tachyons
We consider a D-brane probe in unstable string background associated with
flux branes. The twist in spacetime metric reponsible for the supersymmetry
breaking is shown to manifest itself in mixing of open Wilson lines with the
phases of some adjoint matter fields, resulting in a nonlocal and
nonsupersymmetric form of Yang-Mills theory as the probe dynamics. This
provides a setup where one can study fate of a large class of unstable closed
string theories that include as a limit type 0 theories and various orbifolds
of type II and type 0 theories. We discuss the limit of orbifold
in some detail and speculate on couplings with closed string tachyons.Comment: LaTeX, 17 pages, typos fixed, references update
Stable non-BPS D-branes in Type I string theory
We use the boundary state formalism to study, from the closed string point of
view, superpositions of branes and anti-branes which are relevant in some
non-perturbative string dualities. Treating the tachyon instability of these
systems as proposed by A. Sen, we show how to incorporate the effects of the
tachyon condensation directly in the boundary state. In this way we manage to
show explicitly that the D1 -- anti-D1 pair of Type I is a stable non-BPS
D-particle, and compute its mass. We also generalize this construction to
describe other non-BPS D-branes of Type I. By requiring the absence of tachyons
in the open string spectrum, we find which configurations are stable and
compute their tensions. Our classification is in complete agreement with the
results recently obtained using the K-theory of space-time.Comment: 31 pages, plain LaTeX, final version to be published in Nucl. Phys.
Time-localized projectors in String Field Theory with E-field
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 obtained by inverting the discrete
eigenvalues of the lump solution. The lifetime of the unstable soliton is shown
to depend on two free parameters: the b-parameter and the value of the electric
field. As a by-product, we construct the normalized diagonal basis of the star
algebra in -field background.Comment: 27 +1 pages, v2: references added, typos correcte
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