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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… (More)

We study rolling radion dynamics of electrified D-brane in NS5-brane background, both in effective field theory and in full open string theory. We construct exact boundary states and, from them, extract conserved Noether currents. We argue that T-duality and Lorentz boost offer an intuitive approach. In the limit of large number of NS5-branes, both boundary… (More)

We present two classes of brane solutions in pp-wave spacetime. The first class of branes with a rotation parameter are constructed in an exact string background with NS-NS and R-R flux. The spacetime supersymmetry is analyzed by solving the standard Killing spinor equations and is shown to preserve the same amount of supersymmetry as the case without the… (More)

We study the giant magnon solutions in the near horizon geometry of the Neveu-Schwarz (NS) 5-brane background. In conformal gauge, we find magnon dispersion relation in the large angular momentum (J) limit. We further show that the giant magnon poses uniform distribution of the angular momentum along the string world-sheet as in case of AdS 5 × S 5… (More)

We study the Wilson loops and defects in the three dimensional QFT from the D-branes in the AdS 4 × CP 3 geometry. We find out explicit D-brane configurations in the bulk which correspond to both straight and circular Wilson lines extended to the boundary of AdS 4. We analyze critically the role of boundary contributions to the D2-branes with various… (More)

We construct a family of supersymmetric solutions in time-dependent backgrounds in supergravity theories. One class of the solutions are intersecting brane solutions and another class are brane solutions in pp-wave backgrounds, and their intersection rules are also given. The relation to existing literature is also discussed. An example of D1-D5 with linear… (More)

- S. F. Hassan, Rashmi R. Nayak, Kamal L. Panigrahi
- 2003

A class of Dp and Dp-D(p + 4)-brane solutions are constructed in the Penrose limit of the linear-dilaton geometry. The classical solutions are shown to break all space-time supersymmetries. In the worldsheet description, the branes preserve as many supersymmetries as D-branes in flat space. It is shown that these supersymmetries do not have zero modes on… (More)

We find classical solutions of D-branes in pp-wave spacetime with nonconstant NS − NS flux. We also present Dp − Dp ′ bound state solutions in this background. We further analyze the supersymmetric properties of these brane solutions by solving the type IIB killing spinor equations explicitly.

We study various configurations of rotating and wound D1-brane in AdS 5 × S 5 background and in its β deformed version. We find giant magnon and spike solutions on the world-volume of D1-brane in AdS 5 × S 5 background. We also analyse the equations of motion of D1-brane in β-deformed background. We show that in the limit of large electric flux on… (More)

We study the homogeneous and time dependent dynamics of the su-pertube in diverse backgrounds. After deriving a general form of the Hamiltonian in general background, we use a particular gauge fixing, relevant to our analysis to derive a simpler Hamiltonian. We then study the homogeneous solutions of the equations of motion in various backgrounds and study… (More)