Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Powerful Jets from Radiatively Efficient Disks, a Decades-Old Unresolved
  Problem in High Energy Astrophysics   The discovery of 3C 273 in 1963, and the emergence of the Kerr solution
shortly thereafter, precipitated the current era in astrophysics focused on
using black holes to explain active galactic nuclei (AGN). But while partial
success was achieved in separately explaining the bright nuclei of some AGN via
thin disks, as well as powerful jets with thick disks, the combination of both
powerful jets in an AGN with a bright nucleus, such as in 3C 273, remained
elusive. Although numerical simulations have taken center stage in the last 25
years, they have struggled to produce the conditions that explain them. This is
because radiatively efficient disks have proved a challenge to simulate. Radio
quasars have thus been the least understood objects in high energy
astrophysics. But recent simulations have begun to change this. We explore this
milestone in light of scale-invariance and show that transitory jets, possibly
related to the jets seen in these recent simulations, as some have proposed,
cannot explain radio quasars. We then provide a road map for a resolution.

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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: math