Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the spin paradigm and the radio dichotomy of quasars   We investigate whether models based on the assumption that jets in quasars
are powered by rotating black holes can explain the observed radio dichotomy of
quasars. We show that in terms of the ``spin paradigm'' models, radio-loud
quasars could be objects in which the black hole's rotation rate corresponds to
an equilibrium between spin-up by accretion and spin-down by the
Blandford-Znajek mechanism. Radio-quiet quasars could be hosting black holes
with an average spin much smaller than the equilibrium one. We discuss possible
accretion scenarios which can lead to such a bimodal distribution of black hole
spins.

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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga