Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrinsic Lorentz violation in Doppler effect from a moving point light
  source   Einstein's Doppler formula is not applicable when a moving point light source
is close enough to the observer; for example, it may break down or cannot
specify a determinate value when the point source and the observer overlap. In
this paper, Doppler effect for a moving point light source is analyzed, and it
is found that the principle of relativity allows the existence of intrinsic
Lorentz violation. A conceptual scheme to experimentally test the point-source
Doppler effect is proposed, and such a test could lead to an unexpected result
that the frequency of a photon may change during propagation, which questions
the constancy of Planck constant since the energy conservation in Einstein's
light-quantum hypothesis must hold.

21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex