Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Cosmology of a Universe with Spontaneously-Broken Lorentz Symmetry   A self consistent effective field theory of modified gravity has recently
been proposed with spontaneous breaking of local Lorentz invariance. The
symmetry is broken by a vector field with the wrong-sign mass term and it has
been shown to have additional graviton modes and modified dispersion relations.
In this paper we study the evolution of a homogeneous and isotropic universe in
the presence of such a vector field with a minimum lying along the time-like
direction. A plethora of different regimes is identified, such as accelerated
expansion, loitering, collapse and tracking.

1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex