Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the super-fluid property of the relativistic physical vacuum medium
  and the inertial motion of particles   The similarity between the energy spectra of relativistic particles and that
of quasi-particles in super-conductivity BCS theory makes us conjecture that
the relativistic physical vacuum medium as the ground state of the background
field is a super fluid medium, and the rest mass of a relativistic particle is
like the energy gap of a quasi-particle. This conjecture is strongly supported
by the results of our following investigation: a particle moving through the
vacuum medium at a speed less than the speed of light in vacuum, though
interacting with the vacuum medium, never feels friction force and thus
undergoes a frictionless and inertial motion. The profound and intrinsic
relationship between the super fluid property of the relativistic physical
vacuum medium and the energy-momentum conservation law as well as the
relativistic energy-momentum dispersion relation or the principle of
relativity, can be established.

14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn