Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Mach's Principle and the "Special" Theory of Relativity   First, we present a history of the school of thought that the Cosmic
Microwave Background Radiation acts as an ether in contemporary popular
English. Then we illustrate the properties of this ether and of a hypothetical
"test mass" using a brand new thought experiment. Finally, we recount some
post-Einstein efforts at a mathematical formulation of Mach's principle and
raise some questions about what implications it has for the locality of
rotation and for quantum gravity. This paper does not prove Einstein wrong.

7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin