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- Chanju Kim, Eunkyung Koh
- 2008

We investigate the various properties of Janus supersymmetric Yang-Mills theories. A novel vacuum structure is found and BPS monopoles and dyons are studied. Less supersymmetric Janus theories found before are derived by a simpler method. In addition, we find the supersymmetric theories when the coupling constant depends on two and three spatial coordinates.

- E. P. C. Koh, H. M. Tsai
- 2003

subdomains exist. They include methods using unstructured meshes, body-fitted curvilinear meshes, and Cartesian meshes. This paper discusses an approach that uses " gridless " or " meshless " methods to address the boundary or interface while standard structured grid methods are used everywhere else. The present method uses the Cartesian grid to specify and… (More)

We study a class of dilatation invariant BPS surface operators in 4-dimensional N = 4 Super Yang-Mills theory and their holographic duals in type IIB string theory in AdS 5 × S 5. First we take an example of 1/4 BPS surface operator and study it in detail from the holographic point of view. The gravity dual of this surface operator is a D3-brane… (More)

We investigate 1/2 BPS conformal surface operators in the Klebanov-Witten theory. These surface operators preserve certain parts of the conformal symmetry and R-symmetry as well as half of the supersymmetry. We propose the gravity dual of the surface operator as a configuration of a D3-brane in AdS 5 × T 1,1. This D3-brane preserves the same amount of the… (More)

- E. P. C. Koh, H. M. Tsai
- 2005

An approach that uses gridless or meshless methods to address the problem of boundary implementation associated with the use of Cartesian grid is discussed. This method applies the gridless concept only at the interface, whereas a standard structured grid method is used everywhere else. The Cartesian grid is used to specify and distribute the computational… (More)

- W. Liao, E. P. C. Koh, H. M. Tsai, F. Liu
- J. Comput. Physics
- 2010

- Chanju Kim, Eunkyung Koh
- 2009

We explore the physics of supersymmetric Janus gauge theories in four dimensions with spatial dependent coupling constants e 2 and θ. For the 8 supersymmetric case, we study the vacuum and Bogomol'nyi-Prasad-Sommerfield spectrum, and the physics of a sharp interface where the couple constants jump. We also find less supersymmetric cases either due to… (More)

We consider topological twisting of recently constructed Chern-Simons-matter theories in three dimensions with N = 4 or higher supersymmetry. We enumerate physically inequivalent twistings for each N , and find two different twistings for N = 4, one for N = 5, 6, and four for N = 8. We construct the two types of N = 4 topological theories, which we call… (More)

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