Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Possible Derivative Interactions in Massive bi-Gravity   Using the metric formalism, we study the derivative mixings of spin-2 fields
in massive bi-Gravity. Necessary (but not sufficient) criteria are given for
such mixings to be ghost free. Examples satisfying those criteria are studied
and it is shown that in the decoupling limit they host a ghost.

30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio