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Non-Orientable M(atrix) TheoryOct 27 1997Oct 28 1997M(atrix) theory description is investigated for M-theory compactified on non-orientable manifolds. Relevant M(atrix) theory is obtained by Fourier transformation in a way consistent with T-duality. For nine-dimensional compactification on Klein bottle ... More

M(atrix) Theory on T5/Z2 Orbifold and Five-BranesMay 20 1997Jul 20 1998We study M(atrix) theory description of M theory compactified on T5/Z2 orbifold. In the large volume limit we show that M theory dynamics is described by N=8 supersymmetric USp(2N) M(atrix) quantum mechanics. Via zero-brane parton scattering, we show ... More

M(atrix) Theory on T9/Z2 Orbifold and Twisted Zero BraneOct 31 1997Nov 03 1997M(atrix) theory compactified on an orbifold ${\bf T}_9/{\bf Z}_2$ is studied. Via zero-brane parton scattering we find that each of the $2^9 = 512$ orbifold fixed points carry $-1/32$ units of zero-brane charge. The anomalous flux is cancelled by introducing ... More

Massless and Massive Higher Spins from Anti-de Sitter Space WaveguideMay 20 2016Higgs mechanism to massive higher-spin gauge fields is an outstanding open problem. We investigate this issue in the context of Kaluza-Klein compactification. Starting from a free massless higher-spin field in $(d+2)$-dimensional anti-de Sitter space ... More

The Higgsino-Singlino World at the Large Hadron ColliderMay 14 2014Feb 12 2015We consider light higgsinos and singlinos in the next-to-minimal supersymmetric Standard Model at the Large Hadron Collider. We assume that the singlino is the lightest supersymmetric particle and that the higgsino is the next-to-lightest supersymmetric ... More

Cheng-Yau operator and Gauss map of surfaces of revolutionNov 09 2014We study the Gauss map $G$ of surfaces of revolution in the 3-dimensional Euclidean space ${\mathbb{E}^3}$ with respect to the so called Cheng-Yau operator $\square$ acting on the functions defined on the surfaces. As a result, we establish the classification ... More

Model-independent combination of diphoton constraints at 750 GeVDec 21 2015Apr 27 2016Motivated by the recent diphoton excess reported by both the ATLAS and CMS collaborations, we provide a model-independent combination of diphoton results obtained at $\sqrt{s}=8$ and 13 TeV at the LHC. We consider resonant s-channel production of a spin-0 ... More

Superstring on PP-Wave Orbifold from Large-N Quiver Gauge TheoryMar 08 2002Mar 10 2002We extend the proposal of Berenstein, Maldacena and Nastase to Type IIB superstring propagating on pp-wave over ${\bf R}^4/{\bf Z}_k$ orbifold. We show that first-quantized free string theory is described correctly by the large $N$, fixed gauge coupling ... More

Global p-Brane World: A New Approach to Stable Mass HierarchyDec 19 2000Mar 28 2001We find a class of extremal black hole-like global p-brane in higher-dimensional gravity with a negative cosmological constant. The region inside the p-brane horizon possesses all essential features required for the Randall-Sundrum-type brane world scenario. ... More

Stable Non-BPS Membranes on M(atrix) OrientifoldMar 15 1999Apr 08 1999Examples of stable, non-BPS M-theory membrane configuration are constructed via M(atrix) theory. The stable membranes are localized on O4 or O8 orientifolds, which projects Chan-Paton gauge bundle of M(atrix) zero-brane partons to USp-type. The examples ... More

Frequency resonance in Josephson-junction arrays under strong drivingMay 19 2003We study resonance behavior of a two-dimensional fully frustrated Josephson-junction array driven by high alternating currents. The signal-to-noise ratio (SNR) is examined as the frequency of the driving current is varied; revealed is a certain frequency ... More

Gravitino vs Neutralino LSP at the LHCMay 14 2019Using the latest LHC data, we analyse and compare the lower limits on the masses of gluinos and the lightest stop in two natural supersymmetric motivated scenarios: one with a neutralino being the lightest supersymmetric particle (LSP) and the other one ... More

String Theory on Thin Semiconductors: Holographic Realization of Fermi Points and SurfacesNov 27 2009I make a novel contact between string theory and degenerate fermion dynamics in thin semiconductors. Utilizing AdS/CFT correspondence in string theory and tunability of coupling parameters in condensed matter systems, I focus on the possibilities testing ... More

Heterotic M(atrix) Strings and Their InteractionsApr 23 1997May 12 1997Following recent proposal of Dijkgraaf, Verlinde and Verlinde, we show that the M(atrix) theory compactified on $S_1/Z_2$ provides with a non-perturbative description of second-quantized light-cone heterotic string. This so-called heterotic M(atrix) string ... More

Gravitating M(atrix) Q-BallsNov 11 1997Nov 12 1997Q-ball configuration that represents oscillating or spinning closed membrane is constructed via M(atrix) theory. Upon gravitational collapse Q-balls are expected to form Schwarzschild black holes. For quasi-static spherical membrane, we probe spacetime ... More

Classical and Quantum Aspects of BPS Black Holes in N=2, D=4 Heterotic String CompactificationsOct 22 1996Dec 04 1996We study classical and quantum aspects of D=4, N=2 BPS black holes for T_2 compactification of D=6, N=1 heterotic string vacua. We extend dynamical relaxation phenomena of moduli fields to background consisting of a BPS soliton or a black hole and provide ... More

Nonperturbative QCD Effects in Inclusive B DecaysJun 30 1994In this talk I report calculable nonperturbative QCD effects to the inclusive semileptonic and radiative B-meson decay rates. Small instantons contribute to the Wilson coefficient functions at scales below $m_b$. It is found that the instantons give rise ... More

Design Optimization of a Small-animal SPECT System Using LGSO Continuous Crystal and a Micro Parallel-hole CollimatorMar 12 2015The aim of this study was to optimize the design of a monolithic LGSO scintillation crystal and micro parallel-hole collimator for the development of a small-animal single photon emission computed tomography (SPECT) system with compact size, low-cost ... More

Holography Principle and Topology Change in String TheoryJul 31 1998Jun 02 1999D-instantons of Type IIB string theory are Ramond-Ramond counterpart of Giddings-Strominger wormholes connecting two asymptotic regions of spacetime. Such wormholes, according to Coleman, might lead to spacetime topology change, third-quantized baby universes ... More

Effective Field Theory for Diffractive QCD ProcessesAug 24 1993An effective field theory describing the QCD diffraction scattering is constructed. The constituent quarks interacting with multiperi- pheral gluons and Goldstone bosons are described by impact- parameter two-dimensional sigma models for the color and ... More

Prospects for natural SUSYJun 21 2016Dec 14 2016As we anticipate the first results of the 2016 run, we assess the discovery potential of the LHC to `natural supersymmetry'. To begin with, we explore the region of the model parameter space that can be excluded with various centre-of-mass energies (13 ... More

Confronting the neutralino and chargino sector of the NMSSM to the multi-lepton searches at the LHCDec 12 2018We test the impact of the ATLAS and CMS multi-lepton searches performed at the LHC with 8 as well as 13 TeV center-of-mass energy (using only the pre-2018 results) on the chargino and neutralino sector of the NMSSM. Our purpose consists in analyzing the ... More

DeepXS: Fast approximation of MSSM electroweak cross sections at NLOOct 18 2018Jun 04 2019We present a deep learning solution to the prediction of particle production cross sections over a complicated, high-dimensional parameter space. We demonstrate the applicability by providing state-of-the-art predictions for the production of charginos ... More

Evaluation of Setup Uncertainties for Single-Fraction SRS by Comparing the Two Different Mask-Creation MethodsMar 13 2015The purpose of this study was to evaluate the setup uncertainties for single-fraction stereotactic radiosurgery (SF-SRS) based on the clinical data with the two different mask-creation methods using pretreatment CBCT imaging guidance. Dedicated frameless ... More

Dynamic transition and resonance in current-driven arrays of Josephson junctionsJun 23 2002We consider a two-dimensional fully frustrated Josephson-junction array, which is driven uniformly by oscillating currents. As the temperature is lowered, there emerges a dynamic phase transition to an ordered state with nonzero dynamic order parameter ... More

Illuminating Stealth Scenarios at the LHCDec 21 2018Several ideas exist how the stringent mass limits from LHC on new coloured particles can be avoided. One idea are the so-called `stealth' scenarios in which missing transversal energy (MET) is avoided due a peculiar mass configuration. It is usually assumed ... More

QoE-aware Scalable Video Transmission in MIMO~SystemsOct 24 2016An important concept in wireless systems has been quality of experience (QoE)-aware video transmission. Such communications are considered not only connection-based communications but also content-aware communications, since the video quality is closely ... More

Transport Measurement of Andreev Bound States in a Kondo-Correlated Quantum DotSep 21 2012Dec 06 2012We report transport measurements of gate-tunable Andreev bound states in a carbon nanotube quantum dot coupled to two superconducting leads. In particular, we observe clear features of two types of Kondo ridges, which can be understood in terms of the ... More

Critical currents for vortex defect motion in superconducting arraysMar 15 2005We study numerically the motion of vortices in two-dimensional arrays of resistively shunted Josephson junctions. An extra vortex is created in the ground states by introducing novel boundary conditions and made mobile by applying external currents. We ... More

Phase Transitions in Models for Coupled Charge-Density WavesFeb 02 2004Various phase transitions in models for coupled charge-density waves are investigated by means of the $\epsilon$-expansion, mean-field theory, and Monte Carlo simulations. At zero temperature the effective action for the system with appropriate commensurability ... More

Andreev Bound States in the Kondo Quantum Dots Coupled to Superconducting LeadsSep 14 2006We have studied the Kondo quantum dot coupled to two superconducting leads and investigated the subgap Andreev states using the NRG method. Contrary to the recent NCA results [Clerk and Ambegaokar, Phys. Rev. B 61, 9109 (2000); Sellier et al., Phys. Rev. ... More

Observables and Correlators in Nonrelativistic ABJM TheoryMay 18 2009Jun 05 2009Non-relativistic ABJM theory is defined by Galilean limit of mass-deformed N=6 Chern-Simons theory. Holographic string theory dual to the theory is not known yet. To understand features candidate gravity dual might exhibit, we examine local and nonlocal ... More

Wilsonian Proof for Renormalizability of N=1/2 Supersymmetric Field TheoriesAug 07 2003Aug 14 2003We provide Wilsonian proof for renormalizability of four-dimensional quantum field theories with ${\cal N}=1/2$ supersymmetry. We argue that the non-hermiticity inherent to these theories permits assigning noncanonical scaling dimension both for the Grassman ... More

Finite Transformations in Doubled and Exceptional SpaceOct 22 2015Feb 02 2016In the double field theory, gauge symmetries are realized as generalized diffeomorphisms in the doubled spacetime. By consistency of the theory, dependence of tensor fields on the doubled coordinates is strongly constrained. This causes finite transformation ... More

Nonlinear W(infinity) Algebra as Asymptotic Symmetry of Three-Dimensional Higher Spin Anti-de Sitter GravityAug 26 2010Dec 01 2010We investigate the asymptotic symmetry algebra of (2+1)-dimensional higher spin, anti-de Sitter gravity. We use the formulation of the theory as a Chern-Simons gauge theory based on the higher spin algebra hs(1,1). Expanding the gauge connection around ... More

Holographic Principle and String CosmologyNov 02 1998Nov 24 1998String cosmology is revisited from cosmological viewpoint of holographic principle put forward by `t Hooft, and by Fischler and Susskind. It is shown that the holography requires existence of a `graceful exit' mechanism, which renders the Universe nonsingular ... More

5d Black Hole as Emergent Geometry of Weakly Interacting 4d Hot Yang-Mills GasJul 07 2005May 02 2006We demonstrate five-dimensional anti-de Sitter black hole emerges as dual geometry holographic to weakly interacting N=4 superconformal Yang-Mills theory. We first note that an ideal probe of the dual geometry is the Yang-Mills instanton, probing point ... More

Supertwistor Orbifolds: Gauge Theory Amplitudes and Topological StringsNov 11 2004Nov 17 2004Witten established correspondence between multiparton amplitudes in four-dimensional maximally supersymmetric gauge theory and topological string theory on supertwistor space $CP^{3|4}$. We extend Witten's correspondence to gauge theories with lower supersymmetries, ... More

Rolling Tachyon with Electric and Magnetic Fields -- T-duality approach -----Jan 08 2003Jan 25 2003We study the decay of unstable D$p$-branes when the world-volume gauge field is turned on. We obtain the relevant Dp-brane boundary state with electric and magnetic fields by boosting and rotating the rolling tachyon boundary state of a D(p-1)-brane and ... More

Non-Supersymmetric Stable Vacua of M-TheoryJul 28 1998Nov 24 1998We discuss stability of non-supersymmetric compactification of M-theory and string theory of the form AdS * X, and their dual non-supersymmetric interacting conformal field theories. We argue some of the difficulties in controlling 1/N-corrections disappear ... More

Normalization of the Perturbative QCD Corrections for $B\to X_s \, γ$ DecayMay 29 1995May 30 1995We study the normalization of perturbative QCD corrections to the inclusive $B \rightarrow X_s \gamma$ decay. We propose to set the renormalization scale using the Brodsky-Lepage-Mackenzie (BLM) method. In the proposed method the scale is determined by ... More

Instanton Contribution to $B \rightarrow X_u e \bar ν$ DecayApr 05 1994We study instanton effects on inclusive semileptonic $b \rightarrow u$ decay using the heavy quark effective field theory and the operator product expansion. The effect contributes not only to the hadronic matrix element but also to the coefficient functions ... More

Comments on Anomalies and Charges of Toric-Quiver DualsJan 30 2006We obtain a simple expression for the triangle `t Hooft anomalies in quiver gauge theories that are dual to toric Sasaki-Einstein manifolds. We utilize the result and simplify considerably the proof concerning the equivalence of a-maximization and Z-minimization. ... More

Composite Fermion Metals from Dyon Black Holes and S-DualityDec 07 2009Aug 27 2010We propose that string theory in the background of dyon black holes in four-dimensional anti-de Sitter spacetime is holographic dual to conformally invariant composite Dirac fermion metal. By utilizing S-duality map, we show that thermodynamic and transport ... More

Instanton Contribution to $B \rightarrow X_{s} γ$ DecayJun 10 1994We study instanton effects on $B \rightarrow X_s\gamma$ decay using the heavy quark effective field theory and the operator product expansion. In the dilute gas approximation the effect is negligibly small. This is in contrast to the result of the instanton ... More

Rolling of Modulated Tachyon with Gauge Flux and Emergent Fundamental StringMar 14 2003Apr 11 2003We investigate real-time tachyon dynamics of unstable D-brane carrying fundamental string charge. We construct the boundary state relevant for rolling of modulated tachyon with gauge fields excited on the world-volume, and study spatial distribution of ... More

More CFTs and RG Flows from Deforming M2/M5-Brane HorizonNov 25 1999Near-horizon geometry of coincident M2-branes at a conical singularity is related to M-theory on AdS4 times an appropriate seven-dimensional manifold X7. For X_7=N^{0,1,0}, squashing deformation is known to lead to spontaneous (super) symmetry breaking ... More

Three-Dimensional CFTs and RG Flow from Squashing M2-Brane HorizonAug 16 1999Utilizing AdS/CFT correspondence in M-theory, an example of interacting d=3 conformal field theories and renormalization group flow between them is presented. Near-horizon geometry of N coincident M2-branes located on a conical singularity on eight-dimensional ... More

3 Into 2 Doesn't Go: (almost) chiral gauge theory on the latticeMay 29 1993Kaplan recently proposed a novel lattice chiral gauge theory in which the bare theory is defined on $(2n+1)$-dimensions, but the continuum theory emerges in $2n$-dimensions. We explore whether the resulting theory reproduces all the features of continuum ... More

Invariant Operators, Orthogonal Bases and Correlators in General Tensor ModelsJan 30 2018Jul 12 2018We study invariant operators in general tensor models. We show that representation theory provides an efficient framework to count and classify invariants in tensor models. In continuation and completion of our earlier work, we present two natural ways ... More

Enhanced N=8 Supersymmetry of ABJM Theory on R(8) and R(8)/Z(2)Jun 19 2009Dec 18 2011The ABJM theory refers to superconformal Chern-Simons-matter theory with product gauge group U(L)xU(R) and level +k, -k, respectively. The theory is a candidate for worldvolume dynamics of M2-branes sitting at C(4)/Z(k)k. By utilizing monopole operators, ... More

Emergent AdS3 and BTZ Black Hole from Weakly Interacting Hot 2d CFTApr 14 2006May 02 2006We investigate emergent holography of weakly coupled two-dimensional hyperK\"ahler sigma model on cotangent bundle of (N-1)-dimensional complex projective space at zero and finite temperature. The sigma model is motivated by the spacetime conformal field ... More

Scanning Tunneling Macroscopy, Black Holes, and AdS/CFT Bulk LocalityMar 16 2014Jun 02 2014We establish resolution bounds on reconstructing a bulk field from boundary data on a timelike hypersurface. If the bulk only supports propagating modes, reconstruction is complete. If the bulk also supports evanescent modes, local reconstruction is not ... More

Exact Results and Holography of Wilson Loops in N=2 Superconformal (Quiver) Gauge TheoriesDec 30 2009Feb 01 2011Using localization, matrix model and saddle-point techniques, we determine exact behavior of circular Wilson loop in N=2 superconformal (quiver) gauge theories. Focusing at planar and large `t Hooft couling limits, we compare its asymptotic behavior with ... More

A Note on D-Branes of Odd Codimensions from Noncommutative TachyonsAug 29 2000Sep 19 2000On a noncommutative space of rank-1, we construct a codimension-one soliton explicitly and, in the context of noncommutative bosonic open string field theory, identify it with the D24-brane. We compute the tension of the proposed D24-brane, yielding an ... More

Cosmic HolographyFeb 24 1999Sep 20 2000A new version of holographic principle for cosmology is proposed, which dictates that particle entropy within `cosmological apparent horizon' should not exceed gravitational entropy associated with the apparent horizon. It is shown that, in the Friedman-Robertson-Walker ... More

Holographic View of Causality and Locality via Branes in AdS/CFT CorrespondenceFeb 12 1999Feb 15 1999We study dynamical aspects of holographic correspondence between d=5 anti-de Sitter supergravity and $d=4$ super Yang-Mills theory. We probe causality and locality of ambient spacetime from super Yang-Mills theory by studying transmission of low-energy ... More

Integrable Spin Chain in Superconformal Chern-Simons TheoryJul 13 2008Jul 21 2008N = 6 superconformal Chern-Simons theory was proposed as gauge theory dual to Type IIA string theory on AdS4*CP3. We study integrability of the theory from conformal dimension spectrum of single trace operators at planar limit. At strong `t Hooft coupling, ... More

Time-Delay at Higher Genus in High-Energy Open String ScatteringJul 06 2000Dec 06 2000We explore some aspects of causal time-delay in open string scattering studied recently by Seiberg, Susskind and Toumbas. By examining high-energy scattering amplitudes at higher order in perturbation theory, we argue that causal time-delay at G-th order ... More

Updating Bounds on $R$-Parity Violating Supersymmetry from Meson Oscillation DataOct 18 2018Feb 26 2019We update the bounds on $R$-parity violating supersymmetry originating from meson oscillations in the $B^0_{d/s}$ and $K^0$ systems. To this end, we explicitly calculate all corresponding contributions from $R$-parity violating operators at the one-loop ... More

Complementarity of Resonant Scalar, Vector-Like Quark and Superpartner Searches in Elucidating New PhenomenaAug 03 2016Aug 29 2016The elucidation of the nature of new phenomena requires a multi-pronged approach to understand the essential physics that underlies it. As an example, we study the simplified model containing a new scalar singlet accompanied by vector-like quarks, as ... More

Proofs of two conjectures of Kenyon and Wilson on Dyck tilingsAug 29 2011Oct 22 2012Recently, Kenyon and Wilson introduced a certain matrix $M$ in order to compute pairing probabilities of what they call the double-dimer model. They showed that the absolute value of each entry of the inverse matrix $M^{-1}$ is equal to the number of ... More

Topical Review on Skyrmions and Hall TransportJul 17 2019We review recent progresses towards an understanding of the Skyrmion Hall transport in insulating as well as conducting materials. First, we consider a theoretical breakthrough based on the quantum field theory Ward identity, a first principle analysis, ... More

New interpretations for noncrossing partitions of classical typesOct 11 2009Aug 29 2011We interpret noncrossing partitions of type $B$ and type $D$ in terms of noncrossing partitions of type $A$. As an application, we get type-preserving bijections between noncrossing and nonnesting partitions of type $B$, type $C$ and type $D$ which are ... More

Chain enumeration of $k$-divisible noncrossing partitions of classical typesAug 18 2009Aug 29 2011We give combinatorial proofs of the formulas for the number of multichains in the $k$-divisible noncrossing partitions of classical types with certain conditions on the rank and the block size due to Krattenthaler and M{\"u}ller. We also prove Armstrong's ... More

Comments on "On Clock Synchronization Algorithms for Wireless Sensor Networks Under Unknown Delay"Feb 01 2016The generalization of the maximum-likelihood-like estimator for clock skew by Leng and Wu in the above paper is erroneous because the correlation of the noise components in the model is not taken into account in the derivation of the maximum likelihood ... More

On the behavior of $p$-adic Euler $\ell$-functionsOct 11 2010In this paper we propose a construction of $p$-adic Euler $\ell$-function using Kubota-Leopoldt's approach and Washington's one. We also compute the derivative of $p$-adic Euler $\ell$-function at $s=0$ and the values of $p$-adic Euler $\ell$-function ... More

Josephson current in carbon nanotubes with spin-orbit interactionApr 04 2011We demonstrate that curvature-induced spin-orbit (SO) coupling induces a $0-\pi$ transition in the Josephson current through a carbon nanotube quantum dot coupled to superconducting leads. In the non-interacting regime, the transition can be tuned by ... More

Dual Little Strings from F-Theory and Flop TransitionsOct 25 2016A particular two-parameter class of little string theories can be described by $M$ parallel M5-branes probing a transverse affine $A_{N-1}$ singularity. We previously discussed the duality between the theories labelled by $(N,M)$ and $(M,N)$. In this ... More

Conformal Janus on Euclidean SphereMay 03 2016Aug 01 2017We interpret Janus as an interface in a conformal field theory and study its properties. The Janus is created by an exactly marginal operator and we study its effect on the interface conformal field theory on the Janus. We do this by utilizing the AdS/CFT ... More

Rigid Holography and Six-Dimensional N=(2,0) Theories on AdS_5 times S^1Jan 13 2015Jan 27 2015Field theories on anti-de Sitter (AdS) space can be studied by realizing them as low-energy limits of AdS vacua of string/M theory. In an appropriate limit, the field theories decouple from the rest of string/M theory. Since these vacua are dual to conformal ... More

D-Brane Propagation in Two-Dimensional Black Hole GeometriesJul 05 2005May 01 2006We study propagation of D0-brane in two-dimensional Lorentzian black hole backgrounds by the method of boundary conformal field theory of SL(2,R)/U(1) supercoset at level k. Typically, such backgrounds arise as near-horizon geometries of k coincident ... More

Softer Hard Scattering and Noncommutative Gauge-String DualityMar 27 2003Jul 31 2003We study exclusive scattering of `hadrons' at high energy and fixed angle in (nonconformal) noncommutative gauge theories. Via gauge-string duality, we show that the noncommutativity renders the scattering soft, leading to exponential suppression. The ... More

Supersymetry on the Noncommutative LatticeJan 27 2003Feb 04 2003Built upon the proposal of Kaplan et.al. [hep-lat/0206109], we construct noncommutative lattice gauge theory with manifest supersymmetry. We show that such theory is naturally implementable via orbifold conditions generalizing those used by Kaplan {\sl ... More

Effective Action for Non-Geometric Fluxes from Duality Covariant ActionsDec 27 2016Jul 14 2017The (heterotic) double field theories and the exceptional field theories are recently developed for manifestly duality covariant formulation of various supergravity theories, describing low-energy limit of various (heterotic) superstring and M-theory ... More

Conformal Bootstrap Approach to O(N) Fixed Points in Five DimensionsDec 19 2014Whether O(N)-invariant conformal field theory exists in five dimensions with its implication to higher-spin holography was much debated. We find an affirmative result on this question by utilizing conformal bootstrap approach. In solving for the crossing ... More

Light-Front View of The Axial AnomalyMay 30 1995Motivated by an apparent puzzle of the light-front vacua incompatible with the axial anomaly, we have considered the two-dimensional massless Schwinger model for an arbitrary interpolating angle of the quantization surface. By examining spectral deformation ... More

Spontaneous CP Violation at the Electroweak ScaleMar 16 1992Mar 17 1992Utilizing results on the cosmology of anomalous discrete symmetries we show that models of spontaneous CP violation can in principle avoid the domain wall problem first pointed out by Zel'dovich, Kobzarev and Okun. A small but nonzero $\theta_{QCD}$ explicitly ... More

Static Domain Walls in N=1 SupergravityJan 06 1992We study supersymmetric domain walls in N=1 supergravity theories, including those with modular-invariant superpotentials arising in superstring compactifications. Such domain walls are shown to saturate the Bogomol'nyi bound of wall energy per unit area. ... More

Reflecting Magnon Bound StatesDec 26 2007Feb 16 2008In N=4 super Yang-Mills spin chain, we compute reflection amplitudes of magnon bound-state off giant graviton. We first compute the reflection amplitude off Y=0 brane boundary and compare it with the scattering amplitude between two magnon bound-states ... More

Spin-current noise from fluctuation relationsAug 23 2012We present fluctuation relations that connect spin-polarized current and noise in mesoscopic conductors. In linear response, these relations are equivalent to the fluctuation-dissipation theorem that relates equilibrium current--current correlations to ... More

Noise and fluctuation relations of a spin diodeMay 10 2013We consider fluctuation relations between the transport coefficients of a spintronic system where magnetic interactions play a crucial role. We investigate a prototypical spintronic device (a spin-diode) which consists of an interacting resonant level ... More

Time dependent heat flow in interacting quantum conductorsSep 18 2015We derive the frequency-resolved heat current expression in the linear response regime for a setup comprised of reservoir, interacting central site, and tunneling barrier under the action of a time dependent electrical signal. We exploit the frequency ... More

Dual Little Strings from F-Theory and Flop TransitionsOct 25 2016Nov 08 2016A particular two-parameter class of little string theories can be described by $M$ parallel M5-branes probing a transverse affine $A_{N-1}$ singularity. We previously discussed the duality between the theories labelled by $(N,M)$ and $(M,N)$. In this ... More

Instanton-Monopole Correspondence from M-Branes on $\mathbb{S}^1$ and Little String TheoryNov 09 2015Feb 18 2016We study BPS excitations in M5-M2-brane configurations with a compact transverse direction, which are also relevant for type IIa and IIb little string theories. These configurations are dual to a class of toric elliptically fibered Calabi-Yau manifolds ... More

Baryon and Dark Matter Genesis from Strongly Coupled StringsFeb 25 2011Jun 24 2011D3-brane probes of E-type Yukawa points lead to strongly coupled nearly conformal sectors nearby the Standard Model (visible sector) which are motivated by F-theory GUTs. Realistic visible sector brane configurations induce a seesaw mass hierarchy in ... More

Non(anti)commutative Superspace, UV/IR Mixing & Open Wilson LinesJul 09 2003Jul 16 2003We study quantum aspects of field theories defined on N=1/2 superspace, where both bosonic and fermionic coordinates are made non(anti)commutative. We compute the one-loop effective superpotential, and we find that planar and nonplanar contributions exhibit ... More

Generalized Dynamical Spin Chain and 4-Loop Integrability in N=6 Superconformal Chern-Simons TheoryApr 29 2009Jan 29 2010We revisit unitary representation of centrally extended (2 | 2) excitation superalgebra. We find most generally that `pseudo-momentum', not lattice momentum, diagonalizes spin chain Hamiltonian and leads to generalized dynamic spin chain. All known results ... More

S-Duality, Noncritical Open String and Noncommutative Gauge TheoryJul 11 2000Nov 27 2000We examine several aspects of S-duality of four-dimensional noncommutative gauge theory. By making duality transformation explicit, we find that S-dual of noncommutative gauge theory is defined in terms of dual noncommutative deformation. In `magnetic' ... More

BPS Dynamics of Triple (p,q) String JunctionNov 28 1997Dec 10 1997We study dynamics of triple junction of (p,q) strings in Type IIB string theory. We probe tension and mass density of (p,q) strings by studying harmonic fluctuations of the triple junction. We show that they agree perfectly with BPS formula provided suitable ... More

The Nothing at the Beginning of the Universe Made PreciseJun 14 2006We propose a new worldsheet approach to the McGreevy-Silverstein proposal: resolution of spacelike singularity via Scherk-Schwarz compactification and winding string condensation therein. Our proposal is built upon so-called three parameter sine-Liouville ... More

Dynamic thermoelectric and heat transport in mesoscopic capacitorsAug 08 2013Nov 18 2013We discuss the low-frequency response of charge and heat transport to oscillatory voltage and temperature shifts in mesoscopic capacitors. We obtain within scattering theory generic expressions for the quantum admittances up to second order in the ac ... More

E(lementary) Strings in Six-Dimensional Heterotic F-TheoryJun 16 2017Sep 04 2017Using E-strings, we can analyze not only six-dimensional superconformal field theories but also probe vacua of non-perturabative heterotic string. We study strings made of D3-branes wrapped on various two-cycles in the global F-theory setup. We claim ... More

Three-Dimensional Superconformal Field Theory on Conic Space as Hologram of Charged Topological Black HoleJan 21 2014We construct three-dimensional N=2 supersymmetric conformal field theories on conic spaces. Built upon the fact that the partition function depends solely on the Reeb vector of the Killing vector, we propose that holographic dual of these theories are ... More

M String, Monopole String and Modular FormsMar 24 2015Aug 27 2015We study relations between M-strings (one-dimensional intersections of M2-branes and M5-branes) in six dimensions and m-strings (magnetically charged monopole strings) in five dimensions. For specific configurations, we propose that the counting functions ... More

Antenna Operator Product Expansion of ABJ(M) Lightlike Polygon Wilson LoopDec 30 2014Expectation value of lightlike polygon Wilson loop is computed in the three-dimensional ABJM theory up to second-order in `t Hooft coupling in the limit of infinitely many colors and the result is critically compared with that in the four-dimensional ... More

Macroscopic strings as heavy quarks: Large-N gauge theory and anti-de Sitter supergravityFeb 28 1998Dec 18 2001We study some aspects of Maldacena's large $N$ correspondence between N=4 superconformal gauge theory on D3-brane and maximal supergravity on AdS_5xS_5 by introducing macroscopic strings as heavy (anti)-quark probes. The macroscopic strings are semi-infinite ... More

Baryon Chiral Perturbation Theory in Partially Quenched Large-Nc QCDDec 29 1997May 02 1998Baryons of lower spin in partially quenched large-$N_c$ QCD are studied with particular emphasis to interpolation between standard unquenched and fully quenched limits. In large $N_c$ limit of partially quenched QCD, we calculate $\Delta m$, the chiral ... More

Wilson Loops in Superconformal Chern-Simons Theory and Fundamental Strings in Anti-de Sitter Supergravity DualSep 23 2008Feb 17 2009We study Wilson loop operators in three-dimensional, N=6 superconformal Chern-Simons theory dual to IIA superstring theory on AdS4 x CP3. Novelty of Wilson loop operators in this theory is that, for a given contour, there are two linear combinations of ... More

Quenched and Partially Quenched Chiral Perturbation Theory for Vector and Tensor MesonsAug 22 1997Mar 25 1998Quenched and partially quenched chiral perturbation theory for vector mesons is developed and is used to extract chiral loop correction to the $\rho$ meson mass. Connections to fully quenched and totally unquenched chiral perturbation theory results are ... More