Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Causality for ELKOs   The importance for cosmology of the recently introduced ELKOs requires our
deepest understanding of them and of all of their fundamental properties. Among
these fundamental properties, a special one is causality: in the present paper,
we show that causality is always preserved for ELKOs.

34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol