Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resonance overlap and non-linear velocity spread in Hamiltonian
  beam-plasma systems   We analyze some specific features of the beam-plasma instability. In
particular, non-perturbative effects in the dispersion relation are studied
when the standard perturbative inverse Landau damping treatment breaks down. We
also elucidate how only the global distortion of the profile rather than the
clump width is truly predictive of resonance overlap at saturation.

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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: math
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin