Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sunyaev-Zeldovich and Cosmic Microwave Background   Since its original formulation the Sunyaev-Zeldovich (SZ) effect has been
recognized as a ``powerful laboratory'' for our comprehension of physical
processes in cosmic structures and to derive crucial information on some
general properties of the universe. After a discussion of the fundamental
concepts and of some well established applications of the SZ effect towards
galaxy clusters, I will focus on dedicated themes related to the SZ effect and
other features in the cosmic microwave background (CMB) of particular interest
in the view of the extremely high angular resolution observations achievable in
the future with the Square Kilometre Array (SKA). SKA will allow the mapping of
the thermal and density structure of clusters of galaxies at radio and
centimetre bands with unprecedented resolution and sensitivity and with an
extremely accurate control of extragalactic radio source contamination. The
signatures from SZ effects and free-free emission at galactic scales and in the
intergalactic medium probe the structure evolution at various cosmic times. The
detection of these sources and their imaging at the high resolution and
sensitivity achievable with SKA will greatly contribute to the comprehension of
crucial cosmological and astrophysical aspects, as the physical conditions of
early ionized halos, quasars and proto-galactic gas. The spectacular
improvement in our understanding of the properties of extragalactic radio
sources at very faint fluxes achievable with SKA will allow to accurately model
their contribution to the diffuse radio background, greatly contributing to the
interpretation of next generation of CMB spectrum experiments devoted to probe
the thermal plasma history at early times.

2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn