## Team Members

**Professor Jen-Chi Lee**

Ph.D. in Physics, University of Pennsylvania, USA.

B.Sc. in Electrical Engineering, National Taiwan University.

Research Interests:

• High energy string scatterings and space-time symmetry of string theory.

• Regge string and field theory scatterings.

• Strongly correlated electron systems.

Selected publications:

[1] C. H. Fu, J.C. Lee, C.I. Tan and Y. Yang, “Recurrence relations of higher spin BPST operators for open string”, arXiv 1304.6948 (2013).

[2] J.C. Lee and Y. Mitsuka, “Recurrence relations of Kummer functions and Regge string scattering amplitudes”, JHEP 1304,082 (2013).

[3] Yung-Yeh Chang, Bo Feng, Chih-Hao Fu, J.C. Lee, Yihong Wang and Y. Yang, “A note on on-shell recursion relation of string amplitudes”, JHEP 02 (2013) 028.

[4] S.L. Ko, J.C. Lee, and Y.Y., “Patterns of High energy Massive String Scatterings in the Regge regime”, JHEP 06 (2009) 028.

[5] C. Chan, P.M. Ho, J.C. Lee, S. Teraguchi, Y. Yang, “High-energy zero-norm states and symmetries of string theory”, Phys.Rev.Lett. 96 (2006) 171601.

[6] C. Chan, P.M. Ho, J.C. Lee, S. Teraguchi, Y. Yang, “Solving all 4-point correlation functions for bosonic open string theory in the high energy limit”, Nucl.Phys. B 725, 352 (2005).

[7] C. Chan and J.C. Lee, “Stringy symmetries and their high-energy limits”, Phys. Lett.B 611, 193 (2005).

[8] C. Chan and J.C. Lee, “Zero norm states and high-energy symmetries of string theory”, Nucl. Phys. B 690, 3 (2004).

[9] H.C.Kao, B. Rosenstein and J. C. Lee, “Systematic low temperature expansion in Ginzburg-Landau model”, Phys. Rev. B 61, 12352 (2000).

[10] J. C. Lee and X.G. Wen, “electron and quasipartical exponents of Haldane-Rezayi state in nonAbelian fractional quantum Hall theory”, Nucl. Phys. B 542, 647 (1999).

**Associated Professor Yi Yang**

Ph.D. in Department of Physics, Simon Fraser University, Canada.

MSc. in Department of Physics and Astronomy, University of British Columbia, Canada.

Research Interests:

• Apply AdS/CFT duality in various strongly coupled systems in field theory.

• String scattering amplitudes and the hidden symmetry in string theory.

• Stability and phase structure of black holes.

Selected publications:

[1] Song He, Shang-Yu Wu, Y.Y., Pei-Hung Yuan, “Phase Structure in a Dynamical Soft-Wall Holographic QCD Model”, JHEP 04 (2013) 093.

[2] Yung-Yeh Chang, Bo Feng, Chih-Hao Fu, J.C. Lee, Yihong Wang and Y.Y., “A note on on-shell recursion relation of string amplitudes”, JHEP 02 (2013) 028.

[1] Y.D. Tsai, X.N. Wu and Y.Y., “Phase structure of the Kerr-AdS Black Hole”, Phys.Rev. D85, 044005 (2012).

[1] J.C. Lee, C.H. Yan and Y.Y., “High-energy String Scattering Amplitudes and Signless Stirling Number Identity”, SIGMA 8 (2012), 045.

[3] S. He, J.C. Lee, K. Takahashi and Y.Y., “Massive Superstring Scattering in Regge Regime”, arXiv:1001.5392, Phys.Rev. D83, (2011) 066016.

[4] J.C. Lee, and Y.Y., “Regge Closed String Scattering and its Implication on Fix Angle Close String Scattering”, arXiv:1001.4843, Phys.Lett. B687:84-88 (2010).

[5] M. Huang, S. He, Q. Yan, Y.Y., “Confront Holographic QCD with Regge Trajectories of vectors and axial-vectors”, Euro.Phys.J. C66, Issue 1 (2010) 187.

[6] S.L. Ko, J.C. Lee, and Y.Y., “Patterns of High energy Massive String Scatterings in the Regge regime”, JHEP 06 (2009) 028.

[7] J.C. Lee, T. Takimi and Y.Y., “High-energy String Scatterings of Compactified Open String”, Nucl.Phys. B804:250-261,(2008).

[8] J.C. Lee, Y.Y., “Linear Relations of Absorption/Emission Amplitudes of D-brane”, Phys.Lett. B646 (2007) 120-124.

[9] C. Chan, P.M. Ho, J.C. Lee, S. Teraguchi, Y.Y., “High-energy zero-norm states and symmetries of string theory”, Phys.Rev.Lett. 96 (2006) 171601.

**Dr. Chih-Hao Fu**

Ph.D. in Elementary Paricle Theory, Durham University, United Kingdom.

B.Sc. in Physics, National Taiwan University.

Research Interests:

• Yang-Mills and gravity scattering amplitude.

• String amplitude calculation and relations.

• Britto-Cachazo-Feng-Witten (BCFW) on-shell recursion technique.

• Color-Kinematic duality.

• Kawai-Lewellen-Tye (KLT) relations.

• Double-copy formulations of Yang-Mills and gravity amplitude.

• Twistor formulation.

• Grassmannian integral formula.

Publications:

[1] The Construction of Dual-trace Factor in Yang-Mills Theory, Yi-Jian Du, Bo Feng, Chih-Hao Fu. e-Print: arXiv:1304.2978 [hep-th]

[2] An algebraic approach to BCJ numerators, Chih-Hao Fu, Yi-Jian Du, Bo Feng. JHEP 1303 (2013) 050

[3] A note on on-shell recursion relation of string amplitudes, Yung-Yeh Chang, Bo Feng, Chih-Hao Fu, Jen-Chi Lee, Yihong Wang, Yi Yang. JHEP 1302 (2013) 028

[4] Note on Cyclic Sum and Combination Sum of Color-ordered Gluon Amplitudes, Yi-Jian Du, Bo Feng, Chih-Hao Fu. JHEP 1203 (2012) 016

[5] Note on Permutation Sum of Color-ordered Gluon Amplitudes, Yi-Jian Du, Bo Feng, Chih-Hao Fu. Phys.Lett. B706 (2012) 490-494

[6] BCJ Relation of Color Scalar Theory and KLT Relation of Gauge Theory, Yi-Jian Du, Bo Feng, Chih-Hao Fu. JHEP 1108 (2011) 129

[7] New N=4 SYM Path Integral, Chih-Hao Fu, Renata Kallosh. Phys.Rev. D82 (2010) 125022

[8] Generating MHV super-vertices in light-cone gauge, Chih-Hao Fu. JHEP 1004 (2010) 044

[9] The MHV lagrangian vertices and the Parke-Taylor formula Chih-Hao Fu. e-Print: arXiv:0908.0020 [hep-th]

[10] S-matrix equivalence restored, Chih-Hao Fu, Jonathan Fudger, Paul R.W. Mansfield, Tim R. Morris, Zhiguang Xiao. JHEP 0906 (2009) 035

[11] S-matrix equivalence theorem evasion and dimensional regularisation with the canonical MHV Lagrangian, James H. Ettle, Chih-Hao Fu, Jonathan P. Fudger, Paul R.W. Mansfield, Tim R. Morris. JHEP 0705 (2007) 011

**Dr. Shang-Yu Wu**

Ph.D. in Department of Physics, National Taiwan University.

B.Sc. in Department of Physics, National Taiwan University.

Research Interests:

Application of AdS/CFT duality, cosmology/string cosmology

Selected publications:

[1] Jia-Rui Sun, Shang-Yu Wu, Hai-Qing Zhang, “Novel Features of the Transport Coefficients in Lifshitz Black Branes,” Phys. Rev. D. 87, 086005 (2013) [arXiv:1302.5309[hep-th]].

[2] Song He, Shang-Yu Wu, Yi Yang, Pei-Hung Yuan, “Phase Structure in a Dynamical Soft-Wall Holographic QCD Model,” JHEP 04 (2013) 093 [arXiv:1301.0385[hep-th]].

[3] Wen-Yu Wen, Shang-Yu Wu, “Dipole Coupling Effect of Holographic Fermion in Charged Dilatonic Gravity,“ Phys.Lett. B 712(2012) 266-271 [arXiv:1202.6539 [het-th]].