Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlocality and fluctuations near the optical analog of a sonic horizon   We consider the behavior of fluctuations near the sonic horizon and the role
of the nonlocality of interaction (nonlinearity) on their regularization. The
nonlocality dominates if its characteristic length scale is larger than the
regularization length. The influence of nonlocality may be important in the
current experiments on the transonic flow in Kerr nonlinear media. Experimental
conditions, under which the observation of straddled fluctuations can be
observed, are discussed.

12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat