Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy conditions and constraints on the generalized non-local gravity
  model   We study and derive the energy conditions in generalized non-local gravity,
which is the modified theory of general relativity (GR) obtained by adding a
term $m^{2n-2}R\Box^{-n}R$ to the Einstein-Hilbert action. Moreover, in order
to get some insight on the meaning of the energy conditions, we illustrate the
evolutions of four energy conditions with the model parameter $\varepsilon$ for
different $n$. By analysis we give the constraints on the model parameters
$\varepsilon$.

31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg