Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic acceleration from effective forces?   Accelerated expansion of the Universe may result from an anti-frictional
force that is self-consistently exerted on cold dark matter (CDM). Cosmic
anti-friction is shown to give rise to an effective negative pressure of the
cosmic medium. While other models introduce a component of dark energy besides
``standard'' CDM, we resort to a phenomenological one-component model of CDM
with internal self-interactions. We demonstrate how the dynamics of the
LambdaCDM model may be recovered as a special case of cosmic anti-friction.

12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas