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- Dongsu Bak, Andreas Karch
- 2001

We find a class of flat supersymmetric brane-antibrane configurations. They follow from ordinary brane-antibrane systems by turning on a specific worldvolume background electric field, which corresponds to dissolved fundamental strings. We have clarified in detail how they arise and identified their constituent charges as well as the corresponding… (More)

- Dongsu Bak, Kimyeong Lee
- 2001

We investigate supersymmetric tubular configurations in the matrix theory. We construct a host of BPS configurations of eight supersymmetries. They can be regarded as cylindrical D2 branes carrying nonvanishing angular momentum. For the simplest tube, the world volume can be described as noncommutative tube and the world volume dynamics can be identified as… (More)

- Dongsu Bak, Kimyeong Lee
- 2001

We investigate U (N) Chern-Simons theories on noncommutative plane. We show that for the theories to be consistent quantum mechanically, the coefficient of the Chern-Simons term should be quantized κ = n/2π with an integer n. This is a surprise for the U (1) gauge theory. When a uniform background charge ρ e is present, the quantization rule changes to κ +… (More)

- Dongsu Bak, Kimyeong Lee
- 2002

We consider the maximal supersymmetric pure Yang-Mills theories on six and eight dimensional space. We determine, in a systematic way, all the possible fractions of supersymmetry preserved by the BPS states and present the corresponding 'self-dual' BPS equations. In six dimensions the intrinsic one has 1/4 supersymmetry, while in eight dimensions, 1/16,… (More)

- Dongsu Bak, Kimyeong Lee
- 2000

We consider the noncommutative Abelian-Higgs theory and investigate general static vortex configurations including recently found exact multi-vortex solutions. In particular, we prove that the self-dual BPS solutions cease to exist once the noncommutativity scale exceed a critical value. We then study the fluctuation spectra about the static configuration… (More)

- Dongsu Bak, Nobuyoshi Ohta
- 2001

We consider the flat supersymmetric D2 and anti-D2 system, which follows from ordinary non-commutative D2 anti-D2 branes by turning on an appropriate worldvolume electric field describing dissolved fundamental strings. We study the strings stretched between D2 and anti-D2 branes and show explicitly that the would-be tachyonic states become massless. We… (More)

Using the AdS/CFT correspondence, we examine the behavior of correlators of Polyakov loops and other operators in N = 4 supersymmetric Yang-Mills theory at non-zero temperature. The implications for Debye screening in this strongly coupled non-Abelian plasma, and comparisons with available results for thermal QCD, are discussed.

- Dongsu Bak, Kimyeong Lee, Piljin Yi
- 1999

We find the most general low energy dynamics of 1/2 BPS monopoles in the N = 4 supersymmetric Yang-Mills (SYM) theories when all six adjoint Higgs expectation values are turned on. When only one Higgs is turned on, the Lagrangian is purely kinetic. When all the rest five are turned on a little bit, however, this moduli space dynamics is augmented by five… (More)

The Chern-Simons theories on a noncommutative plane, which is shown to be describing the quantum Hall liquid, is considered. We introduce matter fields fundamentally coupled to the noncommutative Chern-Simons field. Exploiting BPS equations for the non-relativistic Chern-Simons theory, we find the exact solutions of multi vortices that are closely packed… (More)

We consider the nonrelativistic field theory with a quartic interaction on a noncommutative plane and compute the 2-->2 scattering amplitude within perturbative analysis to all orders. We regain the results of the perturbative analysis by finding the scattering and the bound state wave functions of the two particle Schrodinger equation. These wave functions… (More)