Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exponential Fermi Acceleration in a Switching Billiard   In this paper we show an infinite measure set of exponentially escaping
orbits for a resonant Fermi accelerator, which is realised as a square billiard
with a periodically oscillating platform. We use normal forms to describe how
the energy changes in a period and we employ techniques for hyperbolic systems
with singularities to show the exponential drift of these normal forms on a
divided time-energy phase.

3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn