Dark Energy Properties in DBI Theory (2009)
Ahn, Changrim, Kim, Chanju, Linder, Eric V.
The Dirac-Born-Infeld (DBI) action from string theory provides several new classes of dark energy behavior beyond quintessence due to its relativistic kinematics. We constrain parameters of natural...
Vortex-type Half-BPS Solitons in ABJM Theory (2009)
Kim, Chanju, Kim, Yoonbai, Kwon, O-Kab, Nakajima, Hiroaki
We study Aharony-Bergman-Jafferis-Maldacena (ABJM) theory without and with mass deformation. It is shown that maximally supersymmetry preserving, D-term, and F-term mass deformations of single mass...
Cosmological Constant Behavior in DBI Theory (2009)
Ahn, Changrim, Kim, Chanju, Linder, Eric V.
Cosmological constant behavior can be realized as solutions of the Dirac-Born-Infeld (DBI) action within Type IIB string theory and the AdS/CFT correspondence. We derive a family of attractor...
Janus and Multifaced Supersymmetric Theories II (2009)
Kim, Chanju, Koh, Eunkyung, Lee, Ki-Myeong
We explore the physics of supersymmetric Janus gauge theories in four dimension with spatial dependent coupling constants, e^2 and theta. For the 8 supersymmetric case, we study the vacuum and BPS...
Tachyon Vacuum Solution in Open String Field Theory with Constant B Field (2008)
Ishida, Akira, Kim, Chanju, Kim, Yoonbai, Kwon, O-Kab, Tolla, D. D.
We show that Schnabl's tachyon vacuum solution is an exact solution of the equation of motion of Witten's open bosonic string field theory in the background of constant antisymmetric two-form field....
Janus and Multifaced Supersymmetric Theories (2008)
Kim, Chanju, Koh, Eunkyung, Lee, Ki-Myeong
We investigate the various properties Janus supersymmetric Yang-Mills theories. A novel vacuum structure is found and BPS monopoles and dyons are studied. Less supersymmetric Janus theories found...
Negative-Tension Branes and Tensionless 1/2 Brane in Boundary Conformal Field Theory (2008)
Ishida, Akira, Kim, Chanju, Kim, Yoonbai, Kwon, O-Kab
In the framework of boundary conformal field theory we consider a flat unstable D$p$-brane in the presence of a large constant electromagnetic field. Specifically, we study the case that the...
Lower Dimensional Branes in Boundary Conformal Field Theory (2008)
Ishida, Akira, Kim, Yoonbai, Kim, Chanju, Kwon, O-Kab
In the presence of constant background electromagnetic fields, we discuss three types of exactly marginal boundary tachyon operators for static kinks in boundary conformal field theory. Functional...
Reflection Amplitudes of ADE Toda Theories and Thermodynamic Bethe Ansatz (2007)
Changrim Ahn Fateev, Thermodynamic Bethe Ansatz, Changrim Ahn, V. A. Fateev, Chanju Kim, Bedl Yang
We study the ultraviolet asymptotics in affine Toda theories. These models are considered as perturbed non-affine Toda theories. We calculate the reflection amplitudes, which relate different...
RG Flows from Super-Liouville Theory to Critical Ising Model (2006)
Ahn, Changrim, Kim, Chanju, Rim, Chaiho, Zamolodchikov, Al. B.
We study an integrable deformation of the super-Liouville theory which generates a RG flows to the critical Ising model as the IR fixed point. This model turns out to be a supersymmetric sinh-Gordon...
Low Energy Dynamics of Monopoles in Supersymmetric Yang-Mills Theories with Hypermultiplets (2006)
We derive the low energy dynamics of monopoles and dyons in N=2 supersymmetric Yang-Mills theories with hypermultiplets in arbitrary representations by utilizing a collective coordinate expansion. We...
Tachyon Kinks in Boundary String Field Theory (2006)
Kim, Chanju, Kim, Yoonbai, Kwon, O-Kab, Yee, Ho-Ung
We study tachyon kinks with and without electromagnetic fields in the context of boundary string field theory. For the case of pure tachyon only an array of kink-antikink is obtained. In the presence...
Deformed Type 0A Matrix Model and Super-Liouville Theory for Fermionic Black Holes (2005)
Ahn, Changrim, Kim, Chanju, Park, Jaemo, Suyama, Takao, Yamamoto, Masayoshi
We consider a ${\hat c}=1$ model in the fermionic black hole background. For this purpose we consider a model which contains both the N=1 and the N=2 super-Liouville interactions. We propose that...
BPS D-branes from an Unstable D-brane (2005)
Kim, Chanju, Kim, Yoonbai, Kwon, Hwang-hyun, Kwon, O-Kab, Lee, Chong Oh
We search for exact tachyon kink solutions of DBI type effective action describing an unstable D-brane with worldvolume gauge field turned in both the flat and a curved background. There are various...
BPS D-branes from an Unstable D-brane in a Curved Background (2005)
Kim, Chanju, Kim, Yoonbai, Kwon, Hwang-hyun, Kwon, O-Kab
We find exact tachyon kink solutions of DBI type effective action describing an unstable D5-brane with worldvolume gauge field turned on in a curved background. The background of interest is the...
Unstable D-branes and String Cosmology (2004)
Kim, Chanju, Kim, Hang Bae, Kim, Yoonbai, Kwon, O-Kab, Lee, Chong Oh
Cosmological implication of rolling tachyons is reported in the context of effective field theory. With a brief review of rolling tachyons in both flat and curved spacetimes, we study the string...
Tubular D-branes in Salam-Sezgin Model (2004)
Kim, Chanju, Kim, Yoonbai, Kwon, O-Kab
We study DBI-type effective theory of an unstable D3-brane in the background manifold R^{1,1} x M_2 where M_2 is an arbitrary two-dimensional manifold. We obtain an exact tubular D2-brane solution of...
Tachyon Tube and Supertube (2003)
Kim, Chanju, Kim, Yoonbai, Kwon, O-Kab, Yi, Piljin
We search for tubular solutions in unstable D3-brane. With critical electric field E=1, solutions representing supertubes, which are supersymmetric bound states of fundamental strings, D0-branes, and...
Tachyon Kinks on Unstable Dp-branes (2003)
Kim, Chanju, Kim, Yoonbai, Kwon, O-Kab, Lee, Chong Oh
In the context of tachyon effective theory coupled to Born-Infeld electromagnetic fields, we obtain all possible singularity-free static flat configurations of codimension one on unstable Dp-branes....
Kim, Chanju, Kim, Yoonbai, Lee, Chong Oh
We study Born-Infeld type tachyonic effective action of unstable D2-brane with a runaway potential and find rich structure of static regular solitonic solutions. There exists only periodic array of...
Cosmology of Rolling Tachyon (2003)
Kim, Chanju, Kim, Hang Bae, Kim, Yoonbai, Kwon, O-Kab
We study dynamics of rolling tachyon and Abelian gauge field on unstable D-branes, of which effective action is given by Born-Infeld type nonlocal action. Possible cosmological evolutions are also...
Electromagnetic String Fluid in Rolling Tachyon (2003)
Kim, Chanju, Kim, Hang Bae, Kim, Yoonbai, Kwon, O-Kab
We study Born-Infeld type effective action for unstable D3-brane system including a tachyon and an Abelian gauge field, and find the rolling tachyon with constant electric and magnetic fields as the...
Duality in N=2 Super-Liouville Theory (2002)
Ahn, Changrim, Kim, Chanju, Rim, Chaiho, Stanishkov, M.
In this paper we consider a strong-weak coupling duality of the N=2 super-Liouville field theory (SLFT). Without the self-duality found in other Liouville theories, the N=2 SLFT, we claim, is...
Rolling Tachyons in String Cosmology (2002)
Kim, Chanju, Kim, Hang Bae, Kim, Yoonbai
We study the role of rolling tachyons in the cosmological model with dilatonic gravity. In the string frame, flat space solutions of both initial-stage and late-time are obtained in closed form. In...
RG Flows from Super-Liouville Theory to Critical Ising Model (2002)
Ahn, Changrim, Kim, Chanju, Rim, Chaiho, Zamolodchikov, Al. B.
We study an integrable deformation of the super-Liouville theory which generates a RG flows to the critical Ising model as the IR fixed point. This model turns out to be a supersymmetric sinh-Gordon...
Tales of D0 on D6 Branes: Matrix Mechanics of Identical Particles (2002)
Kim, Chanju, Lee, Kimyeong, Yi, Sang-Heon
We investigate a class of matrix model which describes the dynamics of identical particles in even dimentional space. We show that the degrees of freedom after some constraints are implimented is...
RG Flows from Super-Liouville Theory to Critical Ising Model (2002)
Ahn, Changrim, Kim, Chanju, Rim, Chaiho, Zamolodchikov, Al. B.
We study an integrable deformation of the super-Liouville theory which generates a RG flows to the critical Ising model as the IR fixed point. This model turns out to be a supersymmetric sinh-Gordon...
RG Flows from Super-Liouville Theory to Critical Ising Model (2002)
Ahn, Changrim, Kim, Chanju, Rim, Chaiho, Zamolodchikov, Al. B.
We study an integrable deformation of the super-Liouville theory which generates a RG flows to the critical Ising model as the IR fixed point. This model turns out to be a supersymmetric sinh-Gordon...
Reflection Amplitudes of Boundary Toda Theories and Thermodynamic Bethe Ansatz (2001)
Ahn, Changrim, Kim, Chanju, Rim, Chaiho
We study the ultraviolet asymptotics in $A_n$ affine Toda theories with integrable boundary actions. The reflection amplitudes of non-affine Toda theories in the presence of conformal boundary...
One-loop Effective Actions in Shape-invariant Scalar Backgrounds (2001)
Kim, Chanju, Kwon, O-Kab, Lee, Choonkyu
The field-theoretic one-loop effective action in a static scalar background depending nontrivially on a single spatial coordinate is related, in the proper-time formalism, to the trace of the...
DLCQ of Fivebranes, Large N Screening, and L^2 Harmonic Forms on Calabi Manifolds (2001)
Kim, Chanju, Lee, Kimyeong, Yi, Piljin
We find one explicit L^2 harmonic form for every Calabi manifold. Calabi manifolds are known to arise in low energy dynamics of solitons in Yang-Mills theories, and the L^2 harmonic form corresponds...
Kiem, Youngjai, Kim, Chanju, Kim, Yoonbai
We obtain Q-ball solutions in noncommutative scalar field theory with a global U(1) invariance. The Q-ball solutions are shown to be classically and quantum mechanically stable. We also find that...
Applications of Reflection Amplitudes in Toda-type Theories (2001)
Ahn, Changrim, Kim, Chanju, Rim, Chaiho
This paper has been withdrawn.
Perturbative test of exact vacuum expectation values of local fields in affine Toda theories (2001)
Ahn, Changrim, Baseilhac, P., Kim, Chanju, Rim, Chaiho
Vacuum expectation values of local fields for all dual pairs of non-simply laced affine Toda field theories recently proposed are checked against perturbative analysis. The computations based on...
General Low Energy Dynamics of Supersymmetric Monopoles (2000)
Gauntlett, Jerome P., Kim, Chanju, Lee, Kimyeong, Yi, Piljin
We derive general low energy dynamics of monopoles and dyons in N=2 and N=4 supersymmetric Yang-Mills theories by utilising a collective coordinate expansion. The resulting new kind of supersymmetric...
Reflection Amplitudes in Non-Simply Laced Toda Theories and Thermodynamic Bethe Ansatz (2000)
Ahn, Changrim, Baseilhac, P., Fateev, V. A., Kim, Chanju, Rim, Chaiho
We study the ultraviolet asymptotics in non-simply laced affine Toda theories considering them as perturbed non-affine Toda theories, which possess the extended conformal symmetry. We calculate the...
Gauge invariant variables and the Yang-Mills-Chern-Simons theory (1999)
Karabali, Dimitra, Kim, Chanju, Nair, V. P.
A Hamiltonian analysis of Yang-Mills (YM) theory in (2+1) dimensions with a level $k$ Chern-Simons term is carried out using a gauge invariant matrix parametrization of the potentials. The gauge...
Reflection Amplitudes of ADE Toda Theories and Thermodynamic Bethe Ansatz (1999)
Ahn, Changrim, Fateev, V. A., Kim, Chanju, Rim, Chaiho, Yang, Bedl
We study the ultraviolet asymptotics in affine Toda theories. These models are considered as perturbed non-affine Toda theories. We calculate the reflection amplitudes, which relate different...
Thermodynamics of Large-N Super Yang-Mills Theory and AdS/CFT Correspondence (1999)
Thermodynamics of d=4, N=4 supersymmetric SU(N) Yang-Mills theory is studied with particular attention on perturbative expansion at weak `t Hooft coupling regime and interpolation to strong coupling...
Hidden Relation between Reflection Amplitudes and Thermodynamic Bethe Ansatz (1999)
Ahn, Changrim, Kim, Chanju, Rim, Chaiho
In this paper we compute the scaling functions of the effective central charges for various quantum integrable models in a deep ultraviolet region $R\to 0$ using two independent methods. One is based...
Wilson Renormalization Group and Continuum Effective Field Theories (1998)
This is an elementary introduction to Wilson renormalization group and continuum effective field theories. We first review the idea of Wilsonian effective theory and derive the flow equation in a...
Second Virial Coefficient of Anyons without Hard Core (1997)
We calculate the second virial coefficient of anyons whose wave function does not vanish at coincidence points. This kind of anyons appear naturally when one generalizes the hard-core boundary...
Planar Yang-Mills theory: Hamiltonian, regulators and mass gap (1997)
Karabali, Dimitra, Kim, Chanju, Nair, V. P.
We carry out the Hamiltonian analysis of non-Abelian gauge theories in (2+1) dimensions in a gauge-invariant matrix parametrization of the fields. A detailed discussion of regularization issues and...
Recursion Rules for Scattering Amplitudes in Non-Abelian Gauge Theories (1996)
We present a functional derivation of recursion rules for scattering amplitudes in a non-Abelian gauge theory in a form valid to arbitrary loop order. The tree-level and one-loop recursion rules are...
Comment on "Obstructions to the Existence of Static Cosmic Strings in an Abelian Higgs Model" (1994)
There has been considerable interest in the possible cosmic string configurations and Y. Yang has recently derived intriguing obstructions to the existence of cylindrically symmetric solutions in the...
A Renormalization Group Flow Approach to Decoupling and Irrelevant Operators (1994)
Using Wilson-Polchinski renormalization group equations, we give a simple new proof of decoupling in a $\phi^4$-type scalar field theory involving two real scalar fields (one is heavy with mass $M$...
The Abelian Higgs model with or without external particles is considered in curved space. Using the dual transformation, we rewrite the model in terms of dual gauge fields and derive the...
Galilean transformation relates a physical system under mutually perpendicular uniform magnetic and electric fields to that under uniform magnetic field only. This allows a complete specification of...
Kim, Chanju, Lee, Choonkyu, Ko, Pyungwon, Lee, Bum-Hoon, Min, Hyunsoo
A general non-relativistic field theory on the plane with couplings to an arbitrary number of abelian Chern-Simons gauge fields is considered. Elementary excitations of the system are shown to...
Self-dual vortex solutions are studied in detail in the generalized abelian Higgs model with independent Chern-Simons interaction. For special choices of couplings, it reduces to a Maxwell-Higgs...
Hidden Relation between Reflection Amplitudes and Thermodynamic Bethe Ansatz
In this paper we compute the scaling functions of the effective central charges for various quantum integrable models in a deep ultraviolet region R ! 0 using two independent methods. One is based on...