1. Finite-temperature functional RG, droplets and decaying Burgers turbulence
- Author
-
P. Le Doussal
- Subjects
Physics ,symbols.namesake ,Boundary layer ,Exact solutions in general relativity ,Random field ,Turbulence ,Quantum mechanics ,symbols ,General Physics and Astronomy ,Observable ,Function (mathematics) ,Fixed point ,Beta function - Abstract
The functional RG (FRG) approach to pinning of d-dimensional manifolds is re-examined at any temperature T. The coupling function R(u) is shown to be a physical observable in any d, exactly related to a free energy cumulant in a parabolic well. In d = 0 its beta function is displayed to a high order, ambiguities resolved; for random field disorder (Sinai model) we obtain exactly the T = 0 fixed point R(u) and its thermal boundary layer (TBL) form (i.e. for u ~ T) at T > 0. Connection between FRG in d = 0 and decaying Burgers turbulence is discussed. An exact solution to the functional RG hierarchy in the TBL is obtained for any d and related to droplet probabilities.
- Published
- 2006