Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some mechanisms of "spontaneous" polarization of superfluid He-4   Previously, a quantum "tidal" mechanism of polarization of the atoms of He-II
was proposed, according to which, as a result of interatomic interaction, each
atom of He-II acquires small fluctuating dipole and multipole moments, oriented
chaotically on the average. In this work, we show that, in the presence of a
temperature or density gradient in He-II, the originally chaotically oriented
tidal dipole moments of the atoms become partially ordered, which results in
volume polarization of He-II. It is found that the gravitational field of the
Earth induces electric induction U =10(-7)V in He-II (for vessel dimensions of
the order of 10 cm). We study also the connection of polarization and
acceleration, and discuss a possible nature of the electric signal dU = kdT/2e
observed by A.S. Rybalko in experiments with second sound.

23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs