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On operator fields in the bundle of Dirac spinors
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4
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1
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8
ON OPERATOR FIELDS
IN THE BUNDLE OF DIRAC SPINORS.
R. A. Sharipov
Abstract. Operator fields in the bundle of Dirac spinors and their conversion to
spatial fields are considered. Some commutator equations are studied with the use
of the conversion technique.
1. Introduction.
The bundle of Dirac spinors is used for describing particles with half-integer spin
in general relativity and in quantum field theory. It is a special four-dimensional
complex vector-bundle over the space-time manifold M . Let’s remind that the
space-time manifold M itself is a four-dimensional real manifold equipped with a
Minkowski type metric g of the signature (+,?,?,?). Apart from g, the space-
time manifoldM is equipped with two other geometric structures — the orientation
and the polarization. The orientation distinguishes right quadruples of tangent
vectors from left ones, while the polarization distinguishes future and past half
light cones in tangent spaces at each point of M .
The bundle of Dirac spinors is denoted DM . It is equipped with four basic
spin-tensorial fields in addition to g. They are presented in the following table.
Symbol Name Spin-tensorial
type
d Skew-symmetric metric tensor (0, 2|0, 0|0, 0)
H Chirality operator (1, 1|0, 0|0, 0)
D Dirac form (0, 1|0, 1|0, 0)
γ Dirac γ-field (1, 1|0, 0|1, 0)
The metric tensor g itself is interpreted as a spin-tensorial field of the spin-tensorial
type (0, 0|0, 0|0, 2).
In this paper, saying an operator field, we assume a spin-tensorial field F of the
spin-tensorial type (1, 1|0, 0|0, 0). In the coordinate form it is presented by a matrix
2000 Mathematics Subject Classification. 53B30, 81T20, 81R25.
Typeset by AMS-TEX
2 R. A. SHARIPOV
F ab , where a and b are two spinor indices. Each operator field F in the bundle of
Dirac spinors has a unique presentation of the following form:
F ab = u δ
a
b + v H
a
b +
3∑
k=0
γakb uk +
+
3∑
k=0
4∑
c=1
Hac γ
ck
b vk +
3∑
p=0
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