Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mach's Principle: Exact Frame-Dragging by Energy Currents in the
  Universe   We show that the dragging of axis directions of local inertial frames by a
weighted average of the energy currents in the universe (Mach's principle) is
exact for all linear perturbations of all Friedmann-Robertson-Walker universes
and for all types of matter.

32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th