Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The rise of a tensor instability in Eddington-inspired gravity   In this work an extension to Eddington's gravitational action is analyzed. We
consider the tensor perturbations of a FLRW space-time in the Eddington regime
in where the tensor mode is linearly unstable deep and the resulting
modifications to Einstein regime are quite strong.

9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess