Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simply branched covers of an elliptic curve and the moduli space of
  curves   Consider genus g curves that admit degree d covers to an elliptic curve
simply branched at 2g-2 points. Vary a branch point and the locus of such
covers forms a one-parameter family W. We investigate the geometry of W by
using admissible covers to study its slope, genus and components. The results
can also be applied to study slopes of effective divisors on the moduli space
of genus g curves.

11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg