Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Newtonian singularities in higher derivative gravity models   We consider the problem of Newtonian singularity in the wide class of higher
derivative gravity models, including the ones which are renormalizable and
super-renormalizable at the quantum level. The simplest version of the
singularity-free theory has four derivatives and is pretty well-known. We argue
that in all cases of local higher-derivative theories, when the poles of the
propagator are real and simple, the singularities disappear due to the
cancellation of contributions from scalar and tensor massive modes.

19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
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The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga