Yi, Piljin
Professor
String Theory, Field Theory, and Quantum Gravity
Prof. Piljin Yi works on string theories, field theories, and gravity. He is widely recognized for an existence proof of D0brane bound states via an index computation, which remains arguably the most direct evidence for the hypothetical Mtheory, believed to encompass all known superstring theories as conjectured by E. Witten. He has recently returned to an indepth investigation of index theorems in physics context, refining this D0brane study and producing a sweeping generalization of the celebrated AtiyahSinger theorem to the gauged systems. He is also an expert on supersymmetric solitons, and authored a series of landmark papers. Emergence of closed strings as coherent objects in unstable open string theories is another of his important legacy, with potential applications to stringy cosmology and, more importantly, with farreaching implications for the elusive string field theory. A holographic study of nucleons, an unusual excursion, with some impact, to real world physics has been presented in plenary sessions of influential nuclear physics meetings. He has been invited for plenary talks at the prestigious Strings Conferences in 2003 and in 2013, respectively, and currently serves in the International Advisory Committee thereof.
 Ph.D. California Institute of Technology, Pasadena, June 1994
 Postdoctoral Research Scientist, Columbia University, New York, Sept.1994  Aug. 1997
 Research Associate, Newman Lab, Cornell University, Ithaca, Sept.1997  May 1999
 Visiting Professor, University of Chicago, Chicago, February 2001
 Member, Institute for Advanced Study, Princeton, Fall Semester, 2004
 Visiting Professor, Stanford University, Stanford, Winter & Fall Quarters, 2008
 Chair, School of Physics, Korea Institute for Advanced Study, Jan. 2014  Aug. 2016
 Vice President, Korea Institute for Advanced Study, Nov. 2016  Dec. 2019
 Research Council, Institute for Basic Science, Jan. 2015  Jan. 2021
 Vice President, Korean Physical Society, 20212022
 Trustee, Gwangju Institute of Science and Technology (GIST), Oct. 2019  Nov. 2022
 Trustee, The Happiness Foundation, Mar. 2019 
 Professor of Physics, Korea Institute for Advanced Study, Seoul, Sept. 1998 
 Prime Minister Award for Academic Excellence, Commencement, Seoul National University, February 1987
 Fellow, Korea Foundation for Advanced Study, 19871994
 Outstanding Young Reseacher Award, APS March Meeting, 1998
 Invited Speaker, Strings Conference, Kyoto, 2003
 Outstanding Scientist, The Korea Academy of Science and Technology. 2007
 MEST Research & Development Top 50 Projects, Korea, 2007
 Top 100 Nationwide Research Output, KISTEP, Korea, 2008
 Leading Scientist, The Korea Academy of Science and Technology, 2013
 Invited Review Speaker, Strings Conference, Seoul, 2013
Publications at KIAS

Discrete gauge anomalies and instantons
JOURNAL OF HIGH ENERGY PHYSICS, 2024 
Axial anomalies of maximally supersymmetric tensor theories
JOURNAL OF HIGH ENERGY PHYSICS, 2024 
Holonomy saddles and 5d BPS quivers
JOURNAL OF HIGH ENERGY PHYSICS, 2022 
Anomalies and supersymmetry
PHYSICAL REVIEW D, 2022 
Aspects of 5d SeibergWitten theories on S1
JOURNAL OF HIGH ENERGY PHYSICS, 2022 
TTdeformed fermionic theories revisited
JOURNAL OF HIGH ENERGY PHYSICS, 2021 
5D BPS quivers and KK towers
JOURNAL OF HIGH ENERGY PHYSICS, 2021 
Generalized Euler index, holonomy saddles, and wallcrossing
JOURNAL OF HIGH ENERGY PHYSICS, 2020 
Topology of generalized spinors and chiral anomaly
PHYSICAL REVIEW D, 2020 
Index Theorems for Gauge Theories
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, 2018 
Holonomy saddles and supersymmetry
PHYSICAL REVIEW D, 2018 
Dparticles on orientifolds and rational invariants
JOURNAL OF HIGH ENERGY PHYSICS, 2017 
Twisted partition functions and Hsaddles
JOURNAL OF HIGH ENERGY PHYSICS, 2017 
Fundamental vortices, wallcrossing, and particlevortex duality
JOURNAL OF HIGH ENERGY PHYSICS, 2017 
Witten Index for Noncompact Dynamics
JOURNAL OF HIGH ENERGY PHYSICS, 2016 
Witten index and wall crossing
JOURNAL OF HIGH ENERGY PHYSICS, 2015 
Mutation, Witten index, and quiver invariant
JOURNAL OF HIGH ENERGY PHYSICS, 2015 
Exact partition functions on RP2 and orientifolds
JOURNAL OF HIGH ENERGY PHYSICS, 2014 
Abelianization of BPS quivers and the refined Higgs index
JOURNAL OF HIGH ENERGY PHYSICS, 2014 
Two Approaches to Holographic Baryons/Nuclei
FEWBODY SYSTEMS, 2013 
CONSTRUCTIVE WALLCROSSING AND SEIBERG WITTEN
INTERNATIONAL JOURNAL OF MODERN PHYSICS A, 2013 
BPS states, refined indices, and quiver invariants
JOURNAL OF HIGH ENERGY PHYSICS, 2012 
Quiver invariants from intrinsic Higgs states
JOURNAL OF HIGH ENERGY PHYSICS, 2012 
Dbrane anomaly inflow revisited
JOURNAL OF HIGH ENERGY PHYSICS, 2012 
Fournucleon contact interactions from holographic QCD
JOURNAL OF HIGH ENERGY PHYSICS, 2012 
Ab initio wallcrossing
JOURNAL OF HIGH ENERGY PHYSICS, 2011 
Framed BPS states, moduli dynamics, and wallcrossing
JOURNAL OF HIGH ENERGY PHYSICS, 2011 
Nucleonnucleon potential in holographic QCD
NUCLEAR PHYSICS A, 2010 
A matrix model for baryons and nuclear forces
JOURNAL OF HIGH ENERGY PHYSICS, 2010 
A study of WallCrossing: flavored kinks in D=2 QED
JOURNAL OF HIGH ENERGY PHYSICS, 2010 
Holographic deuteron and nucleonnucleon potential
JOURNAL OF HIGH ENERGY PHYSICS, 2009 
A Holographic QCD and Baryons from String Theory
PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, 2009 
A nonperturbative test of M2brane theory
JOURNAL OF HIGH ENERGY PHYSICS, 2008 
A holographic QCD and excited baryons from string theory
JOURNAL OF HIGH ENERGY PHYSICS, 2008 
Nucleon form factors and hidden symmetry in holographic QCD
PHYSICAL REVIEW D, 2008 
Chiral dynamics of baryons from string theory
PHYSICAL REVIEW D, 2007 
Dynamics of baryons from string theory and vector dominance
JOURNAL OF HIGH ENERGY PHYSICS, 2007 
Magnetic monopole dynamics, supersymmetry, and duality
PHYSICS REPORTSREVIEW SECTION OF PHYSICS LETTERS, 2007 
A heterotic flux background and calibrated fivebranes
JOURNAL OF HIGH ENERGY PHYSICS, 2006 
Comments on heterotic flux compactifications
JOURNAL OF HIGH ENERGY PHYSICS, 2006 
Brane inflation, decay of Dbranes, and reheating of the universe
PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, 2006 
Reheating the Universe after string theory inflation
PHYSICAL REVIEW D, 2005 
Winding strings and decay of Dbranes with flux
JOURNAL OF HIGH ENERGY PHYSICS, 2005 
The N=1*theories on R1+2 x S1 with twisted boundary conditions
JOURNAL OF HIGH ENERGY PHYSICS, 2004 
Open/closed duality, unstable Dbranes and coarsegrained closed strings
NUCLEAR PHYSICS B, 2004 
A holographic view on matrix model of black hole
JOURNAL OF HIGH ENERGY PHYSICS, 2004 
String fluid, tachyon matter, and domain walls
JOURNAL OF HIGH ENERGY PHYSICS, 2003 
Tachyon tube and supertube
JOURNAL OF HIGH ENERGY PHYSICS, 2003 
Instantons of M(atrix) theory in PPwave background
JOURNAL OF HIGH ENERGY PHYSICS, 2003 
Deformed matrix theories with N=8 and fivebranes in the PP wave background
JOURNAL OF HIGH ENERGY PHYSICS, 2002 
Tachyon condensates, carrollian contraction of Lorentz group, and fundamental strings
JOURNAL OF HIGH ENERGY PHYSICS, 2002 
Dbrane probe and closed string tachyons
PHYSICAL REVIEW D, 2002 
Discrete light cone quantization of fivebranes, large N screening, and L2 harmonic forms on Calabi manifolds
PHYSICAL REVIEW D, 2002 
Counting YangMills dyons with index theorems
PHYSICAL REVIEW D, 2000 
Confinement on the brane
NUCLEAR PHYSICS B, 2000 
Complete supersymmetric quantum mechanics of magnetic monopoles in N=4 super YangMills theory
PHYSICAL REVIEW D, 2000 
Monopole dynamics and BPS dyons in N=2 superYangMills theories
PHYSICAL REVIEW D, 2000 
Quantum spectrum of instanton solitons in fivedimensional noncommutative U(N) theories
PHYSICAL REVIEW D, 2000 
Membranes from fivebranes and fundamental strings from Dpbranes
NUCLEAR PHYSICS B, 1999
Selected Publications

Anomalies and Supersymmetry
PHYSICAL REVIEW D, 2022 
Holonomy Saddles and Supersymmetry
PHYSICAL REVIEW D, 2018 
Twisted Partition Functions and HSaddles
JOURNAL OF HIGH ENERGY PHYSICS, 2017 
Witten Index and WallCrossing
JOURNAL OF HIGH ENERGY PHYSICS, 2015 
Quiver Invariants from Intrinsic Higgs States
JOURNAL OF HIGH ENERGY PHYSICS, 2012 
Dynamics of baryons from string theory and vector dominance
JOURNAL OF HIGH ENERGY PHYSICS, 2007 
Chiral Dynamics of Baryons from String Theory
PHYSICAL REVIEW D, 2007 
Magnetic monopole dynamics, supersymmetry, and duality
PHYSICS REPORTS, 2007 
Reheating the universe after string theory inflation
PHYSICAL REVIEW D, 2005 
Anomaly of (2,0) Theories
PHYSICAL REVIEW D, 2001 
String Fluid from Unstable DBranes
NUCLEAR PHYSICS B, 2001 
Membranes from FiveBranes and Fundamental Strings from DBranes
PHYSICAL REVIEW D, 1999 
Dyons in N=4 Supersymmetric Theories and ThreePronged Strings
PHYSICAL REVIEW D, 1998 
FourDimensional BPS Spectra via M theory
PHYSICAL REVIEW D, 1998 
Witten Index and Threshold Bound States of DBranes
NUCLEAR PHYSICS B, 1997 
Monopoles and Instantons on Partially Compactified DBrane
PHYSICAL REVIEW D, 1997 
The Moduli Space of Many BPS Monopoles for Arbitrary Gauge Groups
PHYSICAL REVIEW D, 1996 
Electromagnetic Duality and SU(3) monopoles
PHYSICS LETTERS B, 1996
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