Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalar resonance in graviton-graviton scattering at high-energies: the
  graviball   We study graviton-graviton scattering in partial-wave amplitudes after
unitarizing their Born terms. In order to apply S-matrix techniques, based on
unitarity and analyticity, we introduce an S-matrix associated to this
resummation that is free of infrared divergences. This is achieved by removing
the diverging phase factor calculated by Weinberg that multiplies the S matrix,
and that stems from the virtual infrared gravitons. A scalar graviton-graviton
resonance with vacuum quantum numbers (J^{PC}=0^{++}) is obtained as a pole in
the nonperturbative S-wave amplitude, which we call the {\it graviball}. Its
resonant effects along the physical real-s axis may peak at values
substantially lower than the UV cutoff squared of the theory. For some
scenarios, this phenomenon could have phenomenological consequences at
relatively low-energy scales, similarly to the \sigma resonance in QCD.

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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph