204 citations · 2.9k across the 77 of their papers we have counts for
5 papers · 1 filter
Instantons and the QCD Vacuum Wavefunctional
William E. Brown, Juan P. Garrahan, Ian I. Kogan +1
We analyze the instanton transitions in the framework of the gauge invariant variational calculation in the pure Yang-Mills theory. Instantons are identified with the saddle points…
Chiral Symmetry Breaking without Bilinear Condensates, Unbroken Axial Z_N Symmetry, and Exact QCD Inequalities
Ian I. Kogan, Alex Kovner, M. A. Shifman
An alternative pattern of the chiral symmetry breaking, suggested recently by Stern, is investigated. It could be self-consistent provided that the chiral …
D-Instantons on the boundary
Ian I. Kogan, Gloria Luzon
The Maldacena's proposal has established an intriguing connection between string theory in AdS spaces and gauge theory. In this paper we study the effects of adding D(-1)-branes to…
Gravitationally dresed RG flows and zig-zag invariant strings
Ian. I. Kogan, O. A. Soloviev
We propose a world-sheet realization of the zigzag-invariant bosonic and fermionic strings as a perturbed Wess-Zumino-Novikov-Witten model at large negative level on a group ma…
Vacuum Instability in Chern-Simons Theory, Null Vectors and Two-Dimensional Logarithmic Operators
Ian I. Kogan, Alex Lewis
A new relation between two-dimensional conformal field theories and three-dimensional topologically massive gauge theories is found, where the dynamical nature of the 3d theory is…