Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiation enhancement and "temperature" in the collapse regime of
  gravitational scattering   We generalize the semiclassical treatment of graviton radiation to
gravitational scattering at very large energies $\sqrt{s}\gg m_P$ and finite
scattering angles $\Theta_s$, so as to approach the collapse regime of impact
parameters $b \simeq b_c \sim R\equiv 2G\sqrt{s}$. Our basic tool is the
extension of the recently proposed, unified form of radiation to the ACV
reduced-action model and to its resummed-eikonal exchange. By superimposing
that radiation all-over eikonal scattering, we are able to derive the
corresponding (unitary) coherent-state operator. The resulting graviton
spectrum, tuned on the gravitational radius $R$, fully agrees with previous
calculations for small angles $\Theta_s\ll 1$ but, for sizeable angles
$\Theta_s(b)\leq \Theta_c = O(1)$ acquires an exponential cutoff of the large
$\omega R$ region, due to energy conservation, so as to emit a finite fraction
of the total energy. In the approach-to-collapse regime of $b\to b_c^+$ we find
a radiation enhancement due to large tidal forces, so that the whole energy is
radiated off, with a large multiplicity $\langle N \rangle\sim Gs \gg 1$ and a
well-defined frequency cutoff of order $R^{-1}$. The latter corresponds to the
Hawking temperature for a black hole of mass notably smaller than $\sqrt{s}$.

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The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int