**Igor R. Klebanov** is a theoretical physicist whose research is centered on relations between

string theoryString theory is an active research framework in particle physics that attempts to reconcile quantum mechanics and general relativity. It is a contender for a theory of everything , a manner of describing the known fundamental forces and matter in a mathematically complete system...

and

quantum gauge field theoryQuantum field theory provides a theoretical framework for constructing quantum mechanical models of systems classically parametrized by an infinite number of dynamical degrees of freedom, that is, fields and many-body systems. It is the natural and quantitative language of particle physics and...

. Since 1989, he has been a Professor at

Princeton UniversityPrinceton University is a private research university located in Princeton, New Jersey, United States. The school is one of the eight universities of the Ivy League, and is one of the nine Colonial Colleges founded before the American Revolution....

.

Born in Russia in 1962, he emigrated to the U.S. as a teenager. He received his undergraduate education at MIT (class of 1982), and his Ph.D. degree at

Princeton UniversityPrinceton University is a private research university located in Princeton, New Jersey, United States. The school is one of the eight universities of the Ivy League, and is one of the nine Colonial Colleges founded before the American Revolution....

as a student of

Curtis CallanCurtis Callan is a theoretical physicist and a professor at Princeton University. He has conducted research in gauge theory, string theory, instantons, black holes, strong interactions, and many other topics...

in 1986.

In his thesis he made advances in the Skyrme model of

hadronIn particle physics, a hadron is a composite particle made of quarks held together by the strong force...

s.

Klebanov worked as a post-doc at SLAC.

His main contributions to string theory are in

Matrix modelThe term matrix model may refer to one of several concepts:* In theoretical physics, a matrix model is a system with matrix-valued physical quantities. See, for example, Lax pair....

approaches to two-dimensional strings, in brane dynamics, and more recently in the gauge theory-gravity duality.

His work in 1996-97 on relations between branes in

supergravityIn theoretical physics, supergravity is a field theory that combines the principles of supersymmetry and general relativity. Together, these imply that, in supergravity, the supersymmetry is a local symmetry...

and their

gauge theoryIn physics, gauge invariance is the property of a field theory in which different configurations of the underlying fundamental but unobservable fields result in identical observable quantities. A theory with such a property is called a gauge theory...

description anticipated the gauge theory-gravity correspondence.

Klebanov's 1998 paper

*Gauge Theory Correlators from Non-Critical String Theory* with his graduate student

GubserSteven S. Gubser is a professor of physics at Princeton University. His research focuses on theoretical particle physics, especially string theory, and the AdS/CFT correspondence. He is a widely cited scholar in these and other related areas....

, and Polyakov, which made a precise statement of the AdS/CFT duality, is among the all-time top cited papers in high-energy physics.

A series of papers by Klebanov and collaborators on D-branes on the

conifoldIn mathematics and string theory, a conifold is a generalization of a manifold. Unlike manifolds, conifolds can contain conical singularities i.e. points whose neighbourhoods look like cones over a certain base...

has led to discovery of

cascading gauge theoryIn theoretical physics, a cascading gauge theory is a gauge theory whose coupling rapidly changes with the scale in such a way that Seiberg duality must be applied many times....

. Its dual warped throat provides a geometric description of color confinement and

chiral symmetry breakingIn particle physics, chiral symmetry breaking is an example of spontaneous symmetry breaking affecting the chiral symmetry of gauge theory such as Quantum Chromodynamics. The origin may be described as a fermion condensate...

; it has been used in model building for cosmology and particle physics. The relation between 3-dimensional critical O(N) model and bosonic higher-spin gauge theory in 4-dimensional AdS space has been called the Klebanov-Polyakov correspondence.

## Awards

## Works

- hep-th/9702076 "World Volume Approach to Absorption by Non-dilatonic Branes ",
*High Energy Physics - Theory* (hep-th) Igor R. Klebanov, 10 Feb 1997
- hep-th/9802109 "Gauge Theory Correlators from Non-Critical String Theory",
*High Energy Physics - Theory* (hep-th) S.S. Gubser, I.R. Klebanov, A.M. Polyakov, 16 Feb 1998
- hep-th/0007191 "Supergravity and a Confining Gauge Theory: Duality Cascades and Chiral Symmetry Breaking-Resolution of Naked Singularities"
*High Energy Physics - Theory* (hep-th); Igor R. Klebanov (Princeton), Matthew J. Strassler (IAS) 24 Jul 2000
- hep-th/0210114 "AdS Dual of the Critical O(N) Vector Model",
*High Energy Physics - Theory* (hep-th) I.R. Klebanov, A.M. Polyakov, 13 Nov 2002
- "Some stringy aspects of the AdS/CFT duality",
*Strings* 2002, Igor Klebanov
- Solving Quantum Field Theories via Curved Spacetimes,
*Physics Today*Physics Today, created in 1948, is the membership journal of the American Institute of Physics. It is provided to 130,000 members of twelve physics societies, including the American Physical Society...

, Igor Klebanov and Juan Maldacena.

## External links