Finite temperature Functional RG, droplets and decaying Burgers Turbulence

Details Finite temperature Functional RG, droplets and decaying Burgers Turbulence Finite temperature Functional RG, droplets and decaying Burgers Turbulence

2006-05-19

arxiv.org/abs/cond-mat/0605490v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages 1 figure

Scientific paper

The functional RG (FRG) approach to pinning of $d$-dimensional manifolds is reexamined at any temperature $T$. A simple relation between the coupling function $R(u)$ and a physical observable is shown in any $d$. 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 $R(u)$ as well as its thermal boundary layer (TBL) form (i.e. for $u \sim T$) at $T>0$. Connection between FRG in $d=0$ and decaying Burgers is discussed. An exact solution to the functional RG hierarchy in the TBL is obtained for any $d$ and related to droplet probabilities.

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