Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge Acceleration and Field-Lines Curvature: A Fundamental Symmetry
  and Consequent Asymmetries   When a charge accelerates, its field-lines curve in a typical pattern. This
pattern resembles the curvature induced on the field-lines by a neighboring
charge. Not only does the latter case involve a similar curvature, it moreover
results in attraction/repulsion. This suggests a hitherto unnoticed causal
symmetry: charge acceleration-field curvature. We prove quantitatively that
these two phenomena are essentially one and the same. The field stores some of
the charge's mass, yet it is extended in space, hence when the charge
accelerates, inertia makes the field lag behind. The resulting stress in the
field stores some of the charge's kinetic energy in the form of potential
energy. The electrostatic interaction is the approximate mirror image of this
process: The potential energy stored within the field turns into the charge's
kinetic energy. This partial symmetry offers novel insights into two debated
issues in electromagnetism. The question whether a charge radiates in a
gravitational field receives a new twist: If all the charge's field-lines end
with opposite charges that also resist gravity, no radiation is expected.
Similarly for the famous absence of a physical manifestation of the Maxwell
equations' advanced solution: Just as Einstein argued, the reason for this
absence is probabilistic rather than reflecting some inherent time-asymmetry.
Despite the apparent equivalence between the "ontological" and
"instrumentalist" viewpoints concerning the physical reality of field-lines,
there may be cases in which their experimental predictions differ.

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The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom