Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing General Relativity With Laser Accelerated Electron Beams   Electron accelerations of the order of $10^{21} g$ obtained by laser fields
open up the possibility of experimentally testing one of the cornerstones of
general relativity, the weak equivalence principle, which states that the local
effects of a gravitational field are indistinguishable from those sensed by a
properly accelerated observer in flat space-time. We illustrate how this can be
done by solving the Einstein equations in vacuum and integrating the geodesic
equations of motion for a uniformly accelerated particle.

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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an