Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Violation of the Fluctuation-Dissipation Theorem and Heating Effects in
  the Time-Dependent Kondo Model   The fluctuation-dissipation theorem (FDT) plays a fundamental role in
understanding quantum many-body problems. However, its applicability is limited
to equilibrium systems and it does in general not hold in nonequilibrium
situations. This violation of the FDT is an important tool for studying
nonequilibrium physics. In this paper we present results for the violation of
the FDT in the Kondo model where the impurity spin is frozen for all negative
times, and set free to relax at positive times. We derive exact analytical
results at the Toulouse point, and results within a controlled approximation in
the Kondo limit, which allow us to study the FDT violation on all time scales.A
measure of the FDT violation is provided by the effective temperature, which
shows initial heating effects after switching on the perturbation, and then
exponential cooling to zero temperature as the Kondo system reaches
equilibrium.

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The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci