Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higher-order correlation functions and nonlinear response functions in a
  Gaussian trap model   The four-time correlation function of a general dynamical variable obeying
Gaussian statistics is calculated for the trap model with a Gaussian density of
states. It is argued that for energy-independent variables this function is
reminiscent of the four-time functions that have been discussed earlier in the
interpretation of the results of four-dimensional NMR experiments on
supercooled liquids. Using an approximative relation between the four-time
correlation function and the cubic response function the nonlinear
susceptibility is calculated and the results are compared with the
corresponding ones resulting from an exact calculation. It is found that the
results of the approximation change the qualitative behavior of the modulus of
the susceptibility. Whereas in the exact calculation a peak is found in the
modulus in most cases, depending on temperature and the additional model
parameters no such peak occurs in the approximation. This difference has its
origin mainly in an incorrect estimate of the static response. The results are
discussed in relation to recent experimental findings.

37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg