Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino Oscillations and Energy-Momentum Conservation   A description of neutrino oscillation phenomena is presented which is based
on relativistic quantum mechanics and includes both entangled state and source
dependent aspects, unlike both of the conventional approaches which use either
equal energies or equal momenta for the different neutrino mass eigenstates. To
second order in the neutrino masses, the standard result is recovered thus
showing an absence of source dependence to this order. The time dependence of
the wavefunction is found to be crucial to recovering the conventional result.
An ambiguity appears at fourth order in the neutrino masses which generally
leads to source dependence, but the standard formula can be promoted to this
order by a plausible convention.

31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat