Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Einstein's photon box revisited   We present a reformulation of Bohr's analysis of Einstein's thought
experiment with the photon box, which hopefully settles some unclear issues.
The box is weighed by two position measurements, the first immediately before
the emission of the photon and the second after a quarter period of oscillation
of the box, or alternatively after a half period. These times are precisely
defined with respect to the moving clock installed in the box, but vary
statistically when measured with a stationary clock outside the box, due to
gravitational time dilation in accordance with Bohr's original idea. Moreover,
we will discuss two other proposals to solve the apparent inconsistency without
invoking the theory of general relativity.

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The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
3
The categories of this paper are: physics
2
The categories of this paper are: math
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an