Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hydrodynamic fluctuation forces   Two interaction mechanisms of particles in a fluid are proposed on base of
forces, mediated by hydrodynamic thermal fluctuations. The first one is similar
to the conventional van der Waals interaction, but instead of been mediated by
electromagnetic fluctuations, it is mediated by fluctuations of hydrodynamic
sound waves. The second one is due to a thermal drift of particles to the
region with a bigger effective mass, which is formed by the involved
surrounding fluid and depends on an inter-particle distance. The both
mechanisms likely can be relevant in interpretation of the observed long-range
attraction of colloidal particles, since a set different experiments shows the
attraction energy of the order of kT and, perhaps, only a fluctuation mechanism
of attarction provides this universality.

1
The categories of this paper are: cs
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph