Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A unified accretion-ejection paradigm for Black Hole X-ray Binaries   We present a new picture for the central regions of Black Hole X-ray
Binaries. In our view, these central regions have a multi-flow configuration
which consists in (1) an outer standard accretion disc down to a transition
radius r_J, (2) an inner magnetized accretion disc below r_J driving (3) a non
relativistic self-collimated electron-proton jet surrounding, when adequate
conditions for pair creation are met, (4) a ultra relativistic
electron-positron beam. This accretion-ejection paradigm provides a simple
explanation to the canonical spectral states by varying the transition radius
r_J and disc accretion rate independently. Large values of r_J correspond to
the Quiescent state for low $\dot m$ and the Hard state for larger $\dot m$.
These states are characterized by the presence of a steady electron-proton MHD
jet emitted by the disc below r_J. The hard X-ray component is expected to form
at the jet basis. When r_j becomes smaller than the marginally stable orbit
r_i, the whole disc resembles a standard accretion disc, characteristic of the
Soft state. Intermediate states correspond to situations where r_J ~ r_i. At
large $\dot m$, an unsteady pair cascade process is triggered within the jet
axis, giving birth to ejection of relativistic pair blobs. This would
correspond to the luminous intermediate state, with its associated superluminal
motions. The variation of r_J independently of $\dot m$ is a necessary
ingredient in this picture, arising from the presence of a large scale vertical
magnetic field threading the disc.

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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th