Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of self-amplifying Hawking radiation in an analog black hole
  laser   It has been proposed that a black hole horizon should generate Hawking
radiation. In order to test this theory, we have created a narrow, low density,
very low temperature atomic Bose-Einstein condensate, containing an analog
black hole horizon and an inner horizon, as in a charged black hole. We observe
Hawking radiation emitted by the black hole. This is the output of the black
hole laser. We also observe the exponential growth of a standing wave between
the horizons. The latter results from interference between the negative energy
partners of the Hawking radiation and the negative energy particles reflected
from the inner horizon. We thus observe self-amplifying Hawking radiation.

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The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat