Beyond The Quenched (or Probe Brane) Approximation in Lattice (or Holographic) QCD

Abstract

We propose a method to improve the quenched approximation. The method, based on the worldline formalism, takes into account effects of quark loops. The idea is useful mostly for AdS/CFT (holographic) calculations. To demonstrate the method we estimate screening (string breaking) effects by a simple holographic calculation.

Comments: 7 pages, LaTex. 2 eps figures. v2: a discussion added about the holographic form of the method. v3: added references to lattice literature. To appear in Phys.Rev.D