Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic elasticity of rigid rods and strings   We show that the equation of motion for a rigid one-dimensional elastic body
(i.e. a rod or string whose speed of sound is equal to the speed of light) in a
two-dimensional spacetime is simply the wave equation. We then solve this
equation in a few simple examples: a rigid rod colliding with an unmovable
wall, a rigid rod being pushed by a constant force, a rigid string whose
endpoints are simultaneously set in motion (seen as a special case of Bell's
spaceships paradox), and a radial rigid string that has partially crossed the
event horizon of a Schwarzschild black hole while still being held from the
outside.

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The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
16
The categories of this paper are: stat