Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lorentz Gauge Quantization in a Cosmological Space-time   It has recently been shown that it is not possible to impose the Lorentz
gauge condition in a cosmological space-time using the Gutpa-Bleuler method of
quantization. It was also shown that it is possible to add
$\nabla_{\mu}A^{\mu}$ as a new degree of freedom to the electromagnetic field
and that this new degree of freedom might be the dark energy which is producing
the accelerated expansion of the Universe.
  In this paper I show that the Lorentz gauge condition can be imposed using
Dirac's method of quantizing constrained dynamical systems. I also compute the
vacuum expectation value of the energy-momentum tensor and show that it
vanishes. Thus, in Dirac's approach, the electromagnetic field does not make a
contribution to the dark energy.

12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ