Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Problem of Inertia in Friedmann Universes   In this paper we study the origin of inertia in a curved spacetime,
particularly the spatially flat, open and closed Friedmann universes. This is
done using Sciama's law of inertial induction, which is based on Mach's
principle, and expresses the analogy between the retarded far fields of
electrodynamics and those of gravitation. After obtaining covariant expressions
for electromagnetic fields due to an accelerating point charge in Friedmann
models, we adopt Sciama's law to obtain the inertial force on an accelerating
mass $m$ by integrating over the contributions from all the matter in the
universe. The resulting inertial force has the form $F = -kma$, where $k < 1 $
depends on the choice of the cosmological parameters such as $\Omega_{M}$,
$\Omega_{\Lambda}$, and $\Omega_{R}$ and is also red-shift dependent.

33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
3
The categories of this paper are: physics
1
The categories of this paper are: cs
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph