Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revised Theory of Tachyons in General Relativity   A minus sign is inserted, for good reason, into the formula for the
Energy-Momentum Tensor for tachyons. This leads to remarkable theoretical
consequences and a plausible explanation for the phenomenon called Dark Energy
in the cosmos.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th