Feb, 2011 ~ Jan, 2012

Jan. 17 (Tue.) - Jan. 19 (Thu.) @ NCCU, Chiayi
Annual Meeting of the Physical Society of R.O.C, 2012
2012 中華民國物理年會暨成果發表會

Deadline of Abstract Submission: Dec. 9, 2011 (Fri.)
Deadline of Early-bird Registration: Dec. 16, 2011 (Fri.)
Deadline of Online Registration: Dec. 30, 2011 (Fri.)

Jan. 13 (Fri.) 2:20PM, Room 815 @ NTU,
Juven Wang (MIT)
Holographic View on non-relativistic Superfluids, Fermi Surfaces and RG fixed points

ABSTRACT: In the talk, I will introduce a connection between relativistic gravitational physics and non-relativistic many-body quantum systems. Specifically, using the AdS/CFT correspondence, we study the (1)non-relativistic superfluids and (2)non-relativistic Fermi surfaces and their quantum phase transitions. I will also discuss (3)gravitational B-F theory formalism realization on fixed points of Renormalization Group flow. Such as CFT, non-relativistic CFT and Lifshitz field theory. pdf Wang

Jan. 6 (Fri.) 2:20PM, Room 815 @ NTU,
Bo Ning (NTNU)
Holographic Descriptions of Kerr-Newman-AdS-dS Black Hole
pdf Ning

Dec. 23 (Fri.)
2:20PM-, Room 815 @ NTU,
Masafumi Ishihara (NCTU)
Accelerated Quark and Holography for Confining Gauge Theory

6:30PM-, Annual Party of String Focus Group
@ 好吃居酒屋 umaiya

Dec. 20 (Tue.)
ASIAA/CCMS/IAMS/NTU-Phys Joint Colloquia
2:20PM - 3:10PM, Room 104 @ NTU,
Tamiaki Yoneya (Tokyo Univ.)
What is String Theory?

Dec. 21 (Wed.) 2:20PM -, Room 833 @ NTU,
Tamiaki Yoneya (Tokyo Univ.)
Matrix Theory and the Gauge/Gravity Correspondence

Dec. 15 (Thu.) - Dec. 18 (Sun.),
The 4th Taiwan String Theory Workshop
Section A, International Conference Hall (B1) in Library
(浩然圖書資訊中心B1 國際會議廳 A廳),
National Chiao Tung University (NCTU), Hinschu, Taiwan

Dec. 9 (Fri.) Room 815 @ NTU,
2:20PM - 3:30PM
Wu-Yen Chuang (NTU, Math)
Instanton moduli and quantum invariants
--- 10 min. break ---
3:40PM - 4:50PM
Chih-Hao Fu (Zhejiang Univ.)
Color-Kinematic Duality and the analytic behavior under BCFW shifting

ABSTRACT: In a series of recent papers surprisingly well behaved asymptotics were observed by Boels and Isermann in Yang-Mills amplitudes. I shall analyze the large-z behavior from the physical picture proposed by Arkani-Hamed and Kaplanand discuss the mechanism which makes this possible. (Based on 1111.5691 and 1110.4683) pdf Fu

Dec. 2 (Fri.) 2:20PM, Room 815 @ NTU,
Wei-Ming Chen (NTU)
Dualities for Loop Amplitudes of N=6 Chern-Simons Matter Theory
pdf Chen

Nov. 25 (Fri.) 2:20PM, Room 815 @ NTU,
Shou-Huang Dai (NTNU)
Towards the double field theory of double D-branes
pdf Dai

Nov. 18 (Fri.) 2:20PM, Room 815 @ NTU,
Chuan-Tsung Chan (THU)
The ODE/IM correspondence II

reference: hep-th/0703066

Nov. 11 (Fri.) 2:20PM, Room 815 @ NTU,
Chuan-Tsung Chan (THU)
The ODE/IM correspondence I

reference: hep-th/0703066

Nov. 4 (Fri.) 2:20PM, Room 815 @ NTU,
Hirotaka Irie (NCTS)
Stokes Phenomena and Quantum Integrability in Non-critical String/M Theory

ABSTRACT: We develop a general framework to study Stokes phenomena of the k x k isomonodromy systems with an arbitrary Poincaré index r, especially which correspond to two kinds of physically interesting critical points of the multi-cut two-matrix models. Investigation of this system is important for the purpose of figuring out the non-critical version of M theory which unifies various solvable string theories in two-dimension, and Stokes phenomena of these systems have information of strong string-coupling physics which binds perturbative vacua together to formulate non-perturbatively complete string theory.
     In this talk, after discussing Stokes phenomena for general ODE systems, we formulate the physical boundary conditions as a connection to the multi-cut two-matrix models, which enables us to obtain explicit expressions of the Stokes multipliers for quite wide class of k and r. We then discuss an interesting connection between the physical boundary conditions and the discrete Hirota dynamics (T-systems) of quantum integrable systems, which would be an integrable structure of strong string-coupling dual theory, i.e. non-critical M theory.

Oct. 28 (Fri.) 2:20PM, Room 815 @ NTU,
Shinji Hirano (Nagoya)
Summing up all genus free energy of ABJM matrix model
pdf Hirano

Oct. 19 (Wed.) - Oct. 21 (Fri.),
Celebration of Mathematical Sciences,
in Commemoration of the Centennial of the Birth
of Shiing-Shen Chern

@ Auditorium, 1F, Astronomy-Mathematics Building, NTU

Oct. 17 (Mon.) 3:00PM-, Room 716 @ NTU,
Norihiro Iizuka (CERN)
On the Taxonomy of Holographic Fermi/Non-Fermi Liquids

ABSTRACT: The existence of Non-Fermi liquids which are not described by Landau's Fermi liquids is a fascinating puzzle in theoretical physics. In this talk, I will show universal field theories where we can go around the Landau's Fermi-liquids and obtain Non-Fermi-Liquid behavior. These field theories contain dynamical singlet fermions which couple through fermion bilinear terms to strongly coupled sectors which are characterized by its ``dynamical scaling''. Suppose these strongly coupled sectors have gravity dual (which is not necessarily anti-de Sitter space), then by using powerful gauge/gravity duality, I will argue how these dynamical scaling parameters determine the natures of the dynamical singlet fermions in a very universal way; These natures include the existence of Fermi-/Non-Fermi liquids, sharp Fermi-surface, the decay rates and breakdown of the quasi-particles description. I will end with discussion for generalization of our work to include the lattice effects and impurities for more interesting condensed matter system.

Oct. 14 (Fri.) 2:20PM, Room 815 @ NTU,
Yoshihiro Mitsuka (NCTU)
CKY tensors in the NHEK geometry

Oct. 7 (Fri.), Room 815 @ NTU
2:20PM - 3:30PM
Takayuki Hirayama (MISC, Kyoto Sangyo Univ.)
Power Counting Renormalizable Quantum Gravity in D Dimensional Space-Time

ABSTRACT: We study non-polynomial actions containing infinite number of derivative terms as a expansion of transcendental entire function. The transcendental entire function is constructed with the property that the propagator does not introduce new poles, and thus no ghost poles. The D-dimensional gravity, gauge and Yukawa theories with such action become renormalizable because of the same reason why a higher derivative theory is renormalizable.
--- 10 min. (rest) ---
3:40PM - 4:50PM
Hiroshi Isono (TIFR)
Holographic Wilsonian Renormalization Group

Sep. 30 (Fri.) 14:30-15:30, Room 716 @ NTU,
Joint CQSE and CASTS seminar
Wen-Yu Wen (CYCU)
Analytical study of critical magnetic field in a holographic superconductor

ABSTRACT: We analytically sutdy the effect of external magnetic field in a Holographic superconductor by using Sturm-Liouville method. We estimate the coefficient of proportionality at critical temperature and find its denpendence on external magnetic field. By exploring phase diagrams of critical temperature and magnetic field for various condensates, we conclude that a Meissner-like effect is a general feature in Holographic superconductors. We also study the quantum phase transition at zero temperature and find that critical charge density increases linearly with the condensate dimension.
pdf Wen webpage of CQSE

Sep. 23 (Fri.) 14:30-15:30, Room 716 @ NTU,
Joint CQSE and CASTS seminar
Pei-Ming Ho (NTU)
New Gauge Symmetries from String Theory

ABSTRACT: A priori, the notion of gauge symmetry does not have to be restricted to that of Maxwell theory or Yang-Mills theory. In this talk, we will review the algebraic structures of several different kinds of gauge symmetries.
pptx Ho webpage of CQSE

Sep. 16 (Fri.) 2:20PM, Room 815 @ NTU,
Kuo-Wei Huang (NTU)
M5-branes On a Circle

ABSTRACT: In contrast with the significant progresses toward the description of multiple M2-branes, not much is known about multiple M5-branes beyond the predictions of duality and supersymmetry arguments.
     In this talk, I will discuss a new kind of gauge theory which is expected to describe multiple M5-branes on a circle times five dimensional non-compact spacetime with the help of introducing nonlocality along the compactified dimension.
pdf Huang

Aug. 19 (Fri.) 2:20PM, Room 815 @ NTU,
Jean-Emile Bourgine (CQUeST)
Bulk-boundary resonance in one matrix model and Liouville gravity

ABSTRACT: The issue of relating discrete and continuous descriptions of a QFT will be discussed within the solvable example provided by the 2D Quantum Gravity. Here, a continuum limit for the discrete description, given by the hermitian matrix model, can be performed. Results should be compared with the Minimal Liouville Gravity, a minimal model matter coupled to the Liouville field theory. Effective comparison of the correlation functions requires the introduction of a finite renormalization of the couplings, known as the 'resonance transformation'. This transformation will be investigated at the level of boundary 2-pts and bulk-boundary correlators. In the process, the construction of matrix model boundaries will be discussed.
pdf Bourgine

Aug. 12 (Fri.) 2:20PM, Room 815 @ NTU,
Ryu Sasaki (YITP)
Exactly solvable quantum mechanics and infinite families of multi-indexed orthogonal polynomials

ABSTRACT: Infinite families of multi-indexed orthogonal polynomials are discovered as the solutions of exactly solvable one-dimensional quantum mechanical systems. The simplest examples, the one-indexed orthogonal polynomials, are the infinite families of the exceptional Laguerre and Jacobi polynomials of type I and II constructed by the present authors. The totality of the integer indices of the new polynomials are finite and they correspond to the degrees of the ` virtual state wavefunctions' which are `deleted' by the generalisation of Crum-Adler theorem. Each polynomial has another integer n which counts the nodes.

Jul. 1 (Fri.) 2:20PM, Room 815 @ NTU,
Inyong Park (Philander Smith College)
open string engineering of D-brane curvature: strategy of deriving AdS/CFT

Jun. 24 (Fri.) 2:20PM, Room 815 @ NTU,
Wei Li (IPMU)
Flat Space Holography from Entanglement

pdf Li

Jun. 17 (Fri.)
2:20PM-: Room 815 @ NTU,
Kazuyuki Furuuchi (NCTS)
Gauge-Higgs Unification in Spontaneously Created Fuzzy Extra Dimensions

6:30PM-: Group gathering and Farewell party
@ 真北平餐廳(MRT Chiang Kai-Shek Memorial Hall Station Exit No.3),

Jun. 10 (Fri.) 2:20PM, Room 815 @ NTU,
Frederic Jugeau (CAS Beijing)
The Holographic Models of the scalar sector of QCD

ABSTRACT: 't Hooft's works showed that gauge theories within the large N limit can be described according to a formalism peculiar to the string theories. In 1998, J.M. Maldacena identified such a relation precisely: the AdS/CFT correspondence which postulates a duality between the 't Hooft limit of a strongly couples superconformal four-dimensional Yang-Mills theory and the supergravity limit of a weakly-coupled string theory defined in five-dimensional anti-de Sitter space-time. However, strictly speaking, this correspondence cannot be applied to a confining gauge theory such as QCD since it is neither supersymmetric nor conformal. The AdS/QCD approach seeks nevertheless to identify the gravity theory dual to QCD. Among the various weakly-coupled holographic models able to describe the non-perturbative regime of QCD, I will discuss to a large extent the so-called Hard-Wall and Soft-Wall models which, for the latter, succeeds in reproducing the linear Regge trajectories of hadrons. Especially, I plan to review AdS/QCD studies which focused on the scalar sector of QCD. I will then discuss the holographic descriptions of the spontaneous chiral symmetry breaking in both models.
pdf Jugeau

Jun. 3 (Fri.) 2:20PM, Room 815 @ NTU,
Nan-Kuo Ho (NTHU, Math)
Morse theory and the Moduli space of minimal Yang-Mills connections over a compact surface

May. 27 (Fri.) 2:20PM, Room 815 @ NTU,
Chuan-Tsung Chan (THU)
Painlevé Equations as Isomonodromy Deformation Flow(s) of Linear Differential Equations

May. 20 (Fri.)
10:30AM-12:00AM, Room 111 @ NTU
Alexander R. Its (IUPUI)
Painlevé Transcendents and Random matrices

ABSTRACT: Painlevé functions have been playing increasingly important role in random matrix theory since the early nineties works on the 2d quantum gravity of Brézin and Kazakov, Douglas and Shenker, and Gross and Migdal and the works (also early nineties) of Mehta and Mahoux, and Tracy and Widom on the level spacing distributions. Indeed, the appearance of Painlevé fucntions in the field can be traced to 1970s-1980s works of Barouch, McCoy, Tracy, and Wu, and of Jimbo, Miwa, Mori and Sato on the quantum correlation functions. In this talk we will try to review these, and also some of the more recent results concerning Painlevé transcendents and random matrices. We will present a unified point view on the subject based on the Riemann-Hilbert method. The emphasis will be made on the various double scaling limits related to the universal properties of random matrices for which Painlevé functions provide an adequate ``special function environment''.
2:20PM-, Room 815 @ NTU
Shin Nakamura (Kyoto Univ.)
Negative Differential Resistivity from AdS/CFT: a new approach to non-equilibrium physics?

ABSTRACT: Negative differential resistivity (NDR) is a non-linear phenomenon in charge transport, where the increasing current reduces the induced voltage. This "counter-intuitive" phenomenon has been widely observed in strongly-correlated electron systems. However, since NDR occurs out of equilibrium, its theoretical description is quite a challenge. I will point out that the AdS/CFT correspondence can be a useful tool to deal with non-equilibrium steady states and I will reproduce NDR by using AdS/CFT in my talk. The reference is arXiv:1006.4105.
pdf Nakamura

May. 13 (Fri.) 2:20PM, Room 815 @ NTU,
Debaprasad Maity (NTU)
Properties of Holographic strongly correlated system

pdf Maity

May. 6 (Fri.) 2:20PM, Room 815 @ NTU,
Domenico Orlando (IPMU)
Squashed group manifolds in String Theory
...exact solutions, brane realization, classical integrability

pdf Orlando

Apr. 29 (Fri.) 2:20PM, P512 @ 3rd General Building 5F NCTS in NTHU,
Susanne Reffert (IPMU)
Dualities and Branes in the Gauge/Bethe Correspondence

pdf Reffert

Apr. 22 (Fri.) 2:20PM, Room 815 @ NTU,
Bo Ning (Peking Univ.)
Self-Dual Warped AdS_3 Black Holes

pdf Ning

Apr. 15 (Fri.) 2:20PM, Room 815 @ NTU,
George Moutsopoulos (NCTU)
Warped Anti-de Sitter, quotients, limits, and an Ansatz in TMG

ABSTRACT: I review warped Anti-de Sitter geometry and its quotients and describe the spacetime limits as limits of the identification vector. I also motivate an Ansatz we used to solve the equations of motion of Topologically Massive Gravity.
pdf Moutsopoulos

Apr. 6 (Wed.) - 9 (Sat.),
24th Taiwan Spring School on Particles and Fields
@ NCTS and NTHU, Hsinchu

talk files and videos

Apr. 1 (Fri.) - Apr. 5 (Tue.),
2011 Cross Strait Meeting on Particle Physics and Cosmology
@ NCTS and NTHU, Hsinchu


Mar. 25 (Fri.) 2:20PM, Room 815 @ NTU,
Chi-Hsien Yeh (NTU)
D-Brane in R-R Field Background

pdf Yeh

Mar. 18 (Fri.) 2:20PM, Room 815 @ NTU,
Toshio Nakatsu (Setsunan Univ.)
Melting Crystal, Quantum Torus and Supersymmetric Yang-Mills

Mar. 11 (Fri.) 2:20PM, Room 815 @ NTU,
Nadav Drukker (Imperial College, London)
Generalized quark-antiquark potential at weak and strong coupling

Mar. 4 (Fri.) Room 815 @ NTU,
2:20PM-3:30PM I-Sheng Yang [楊益昇] (Columbia Univ.)
Conifunneling : An Extreme Path on the String Landscape

ABSTRACT: We studied vacuum transition on the landscape of type IIB string theory, with the family of simplest possible Calabi-Yau 3-folds. We found that during the trantision, the Calabi-Yau tends to be extremely deformed. In our special case it develops a strongly warped connifold as described by Klebanov and Strassler. We discussed how this extreme behavior will help us better understand the structure of the landscape. [reference: arXiv:1011.6588]
3:40PM-4:50PM Yoshinori Honma (Sokendai,KEK)
Dp-branes, NS5-branes and U-duality from nonabelian (2,0) theory with Lie 3-algebra

pdf Yang
pptx Honma

Feb. 25 (Fri.), Room 815 @ NTU,
10:30AM-12:00AM Ryo Suzuki (Utrecht)
Hybrid NLIE for the Mirror AdS_5 x S^5

ABSTRACT: The exact quantum spectrum of string states on AdS_5 x S^5 is expected to be given by Thermodynamic Bethe Ansatz (TBA) equations. However, it is not easy to analyze TBA because it involves infinitely many Y-functions. In this talk, I will explain how to simplify part of TBA equations by the decomposition of Y-functions into constituents; like mesons into quarks. This method is based on A1 symmetry, integrability and analyticity, and thus applicable to other integrable models.
--- lunch ---
2:20PM- Tsunehide Kuroki (Rikkyo Univ.)
Deformation of half-BPS solution in ABJM model and instability of supermembrane

ABSTRACT: It is well-known that a supermembrane in the light-cone gauge has a continuous spectrum and is unstable. Physical interpretation of this instability is that a supermembrane can have a long thin tube without cost of energy and consequently it becomes a spiky configuration in which multiple membranes are connected by thin tubes.
   On the other hand, the ABJM model was proposed as a low-energy description of multiple M2-branes in the static gauge. It is natural that an M2-brane is also unstable in this gauge if we believe the physical picture in the light-cone gauge. In order to examine this, we construct a BPS solution explicitly both in the Nambu-Goto action of a supermembrane in the static gauge and in the U(1)×U(1) ABJM model, which represents intersecting M2-branes. Since this configuration is regarded as a single M2-brane emitting another one, we study the instability of an M2-brane by analyzing fluctuations around it. We show that a zero mode exists which can deform the configuration. For comparison, we also examine a similar configuration on the D2-brane and check that it does not have such zero modes under a fixed string charge. Furthermore we confirm that the novel Higgs mechanism translates our BPS solution in the ABJM model into that in the D2-brane world volume theory, where the winding number of the former around the fixed point of the orbifold becomes the number of strings ending on the D2-brane in the latter.
pdf Suzuki
pdf Kuroki

Feb. 18 (Fri.) 2:20PM, Room 815 @ NTU,
Seiji Terashima (YITP)
Multiple M5-branes and ABJM Theory

ABSTRACT: We construct a classical solution in the ABJM theory corresponding to multiple M5-branes with a non-zero self-dual three-form flux. Considering the fluctuations around this solution, we obtain D4-brane-like action but the gauge coupling constant depends on the spacetime coordinate. This is consistent with the expected properties of M5-brane action. We also see that this solution is closely related with the three-algebra and the Nambu-Poisson bracket is hidden in the solution.
ppt Terashima

Feb. 11 (Fri.) 2:20PM, Room 815 @ NTU,
Ta-Sheng Tai (Riken)
Seiberg-Witten prepotential from WZNW conformal block: Langlands duality and Selberg trace formula

ABSTRACT: We show Seiberg-Witten prepotentials can be derived from WZNW conformal blocks amazingly using Langlands duality!!

Past Workshops

Taiwan String Theory Workshop 2011
Dec.15 (Wed.) to Dec. 18 (Sat.), 2010, THU, Taichung [Deadline:Nov. 30, 2010] webpage
5th Asian Winter School on Strings, Particles and Cosmology
Jan. 10 (Mon.) - Jan. 17 (Mon.), 2011, Suite Hotel, Jeju, Korea [Deadline:Oct. 30, 2010]
Nagoya University GCOE Spring School 2011 "Gauge Theory, Gravity, and String Theory"
Mar. 21 (Mon.) - Mar. 24 (Thu.), 2011, Nagoya Univ., Japan [Deadline: February 20 (for support), March 7]
2011 Cross Strait Meeting on Particle Physics and Cosmology
Apr. 1 (Fri.) - Apr. 5 (Tue.), 2011, NCTS & NTHU, Hsinchu
24th Taiwan Spring School on Particles and Fields Apr. 6 (Wed.) - Apr. 9 (Sat.), 2011, NCTS & NTHU, Hsinchu [Deadline: Mar. 31, 2011]
2011 TIMS Summer School on Mirror Symmetry
Jul. 7 (Tue.) - Jun. 10 (Fri.), 2011, @ 308, New Mathematics Building, NTU
Strings 2011
Jun. 27 (Mon.) to Jul. 2 (Sat.), 2011, Uppsala, Sweden
Celebration of Mathematical Sciences, in Commemoration of the Centennial of the Birth of Shiing-Shen Chern
Oct 19th (Wed) – Oct 21st (Fri), 2011, Auditorium, 1F, Astronomy-Mathematics Building, NTU