Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Influence of Quintessence on the Separation of CMB Peaks   A hypothetical dark energy component may have an equation of state that is
different from a cosmological constant and possibly even changing in time. The
spacing of the cosmic microwave background peaks is sensitive to the ratio of
the horizon sizes today and at last scattering and therefore to the details of
the cosmological evolution. Together with independent measurements of today's
cosmological parameters, this restricts quintessence models in the epoch before
and during decoupling. For fixed \Omega^b_0, \Omega^{cdm}_0 and h, we give an
analytic estimate of the spacing that depends on \Omega^{\phi}_{ls},
\Omega^{\phi}_0 and an effective equation of state of the dark energy
component.

27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat