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We use rotation of one D-brane with respect to the other to reveal the hidden structure of D-branes in type-II theories. This is done by calculation of the interaction amplitude for two different parallel and angled branes. The analysis of strings with different boundary conditions at the ends is also given. The stable configuration for two similar branes… (More)

Noncommutative torus compactification of Matrix model is shown to be a direct consequence of quantization of the open strings attached to a D-membrane with a nonvanishing background B field. We calculate the BPS spectrum of such a brane system using both string theory results and DBI action. The DBI action leads to a new transformation property of the… (More)

Compacitification of the M(atrix) model on tori T d [1] have lead to interesting consequences, including super Yang Mills theories on d+1 dimensional dual tori for lower dimensions and non trivial theories for higher dimensions. It was observed recently [2] that compactification of the M(atrix) model on a two dimensional ”noncommutative” torus T , leads to… (More)

We apply the Dirac bracket quantization to open strings attached to branes in the presence of background antisymmetric field and recover an inherent noncommutativity in the internal coordinates of the brane. 1 E-mail: ardalan, arfaei, jabbari@theory.ipm.ac.ir

In this article we consider open strings with mixed boundary conditions (a combination of Neumann and Dirichlet at each end), and discuss how their end points show a Dp-brane with NS-NS charge, i.e. a bound state of a D-brane with fundamental strings. We show these branes are BPS saturated. Restricting ourselves to D-string case, their mass density is shown… (More)

Interaction of branes in presence of internal gauge fields is considered by using the boundary state formalism . This approach enables us to consider the problems that are not easily accessible to the canonical approach via open strings . The effects of compactification of some of the dimensions on tori are also discussed . Also we study the massless state… (More)

- Farhad Ardalan, Hessamaddin Arfaei, M. R. Garousi, Aneiss Ghodsi
- 2008

The effective action for the low energy scattering of two gravitons with a D-brane in the presence of a constant antisymmetric B field in bosonic string theory is calculated and the modification to the standard D-brane action to first order in α′ is obtained. Ardalan@theory.ipm.ac.ir Arfaei@theory.ipm.ac.ir Garousi@theory.ipm.ac.ir Ahmad@theory.ipm.ac.ir

We present a general description of two mixed branes interactions. For this we consider two mixed branes with dimensions p1 and p2, in external field Bμν and arbitrary gauge fields A (1) α1 and A (2) α2 on the world volume of them, in spacetime in which some of its directions are compactified on circles with different radii. Some examples are considered to… (More)

We start from a generic metric which describes four dimensional stationary black holes in an arbitrary theory of gravity and show that the AdS2 part of the near horizon geometry is a consequence of the double-horizon limit and finiteness . We also show that the field configurations of the near horizon are determined if the same conditions are applied to the… (More)

In this paper we obtain the boundary state of a one dimensional mixed brane which makes angle with X 1-direction, in spacetime in which some of its directions are compactified on tori. Then we use of this boundary state for computing the interaction of two angled m 1-branes. Also we study the massless states contribution on this interaction.