Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new relativity principle for bodies in different gravitational
  potentials   A general principle of non-equivalence for bodies and observers in different
G potentials (GP) was derived from correspondence of the Einstein's equivalence
principle either with optical physics or with gravitational experiments in
which bodies and observers are in different GP. According to it some relative
physical changes occur to any well defined part of an object after a change of
GP.. Such changes cannot be measured by observers travelling with the object
because his instruments change in identical proportions. The same principle was
derived from a new gravitational theory based on a particle model made up of
photons in stationary states. Such model accounts for the inertial and
gravitational properties of matter. This principle is not consistent with both,
the classical hypotheses on the relative invariability of the bodies after a
change of GP and with the G field energy hypothesis. The two kinds of errors
are of the same magnitude and opposite signs. Such errors are cancelled but
only when the two hypotheses are used. This accounts for the good predictions
of general relativity for the classical gravitational tests. The new properties
of the universe derived from the new principle, are radically different from
the classical ones. They are more clearly consistent with the astronomical
observations.

11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin