Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasars formation around clusters of primordial black holes   We propose the model of first quasars formation around the cluster of
rimordial black holes (PBHs). It is supposed, that mass fraction of the
universe ~10^-3 is composed of the compact clusters of PBHs, produced during
the phase transitions in the early universe. The clusters of PBHs become the
centers of dark matter condensation. As a result, the galaxies with massive
central black holes are formed. In the process of galaxies formation the
central black holes are growing due to accretion. This accretion is acompaned
by the early quasar activity.

19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci