Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particles here and beyond the Mirror   This study looks at motion of particles using mathematical methods of
chronometric invariants (physical observable values in General Relativity). It
is shown that aside for mass-bearing particles and light-like particles
"zero-particles" can exist in fully degenerated space-time (zero-space). For a
regular observer zero-particles move instantly, thus transferring long-range
action. Further we show existence of two separate areas in unhomogeneous
space-time, where observable time flows into future and into past, while this
duality is not found in homogeneous space-time. These areas are referred to as
our world, where time flows into future and as the mirror Universe, where time
flows in past. The areas are separated with a space-time membrane, referred to
as zero-space, where observable time stops.

15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
9
The categories of this paper are: nlin