Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative acceleration and transient, radiation-induced electric fields   The radiative acceleration of particles and the electrostatic potential
fields that arise in low density plasmas hit by radiation produced by a
transient, compact source are investigated. We calculate the dynamical
evolution and asymptotic energy of the charged particles accelerated by the
photons and the radiation-induced electric double layer in the full
relativistic, Klein-Nishina regime. For fluxes in excess of $10^{27}$ ${\rm
erg} {\rm cm}^{-2} {\rm s}^{-1}$, the radiative force on a diluted plasma
($n\la 10^{11}$ cm$^{-3}$) is so strong that electrons are accelerated rapidly
to relativistic speeds while ions lag behind owing to their larger inertia. The
ions are later effectively accelerated by the strong radiation-induced double
layer electric field up to Lorentz factors $\approx 100$, attainable in the
case of negligible Compton drag. The asymptotic energies achieved by both ions
and electrons are larger by a factor 2--4 with respect to what one could
naively expect assuming that the electron-ion assembly is a rigidly coupled
system. The regime we investigate may be relevant within the framework of giant
flares from soft gamma-repeaters.

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The categories of this paper are: q-bio
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
3
The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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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: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an