Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The fourth tautological group of $\bar{\mathcal{M}_{g,n}}$ and relations
  with the cohomology   We give a complete description of the tautological subgroup of the fourth
cohomology group of the moduli space of pointed stable curves, and prove that
for g \geq 8 it coincides with the cohomology group itself. We further give a
conjectural upper bound depending on the genus for the degree of new
tautological relations.

20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat