Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reconnection-driven particle acceleration in relativistic shear flows   Particle energization in shear flows is invoked to explain non-thermal
emission from the boundaries of relativistic astrophysical jets. Yet, the
physics of particle injection, i.e., the mechanism that allows thermal
particles to participate in shear-driven acceleration, remains unknown. With
particle-in-cell simulations, we study the development of Kelvin-Helmholtz (KH)
instabilities seeded by the velocity shear between a relativistic
magnetically-dominated electron-positron jet and a weakly magnetized
electron-ion ambient plasma. We show that, in their nonlinear stages, KH
vortices generate kinetic-scale reconnection layers, which efficiently energize
the jet particles, thus providing a first-principles mechanism for particle
injection into shear-driven acceleration. Our work lends support to
spine-sheath models of jet emission - with a fast core/spine surrounded by a
slower sheath - and can explain the origin of radio-emitting electrons at the
boundaries of relativistic jets.

10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex