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Single-Particle Electrodynamics - Assassination Science

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G.5.2<br />

Covariant field expressions<br />

Since a significant amount of intelligence is required to convert the manifestly-covariant<br />

retarded field expressions to their final simplified non-covariant<br />

form, we will here only verify that the initial and final expressions agree,<br />

when all convenient quantities are expanded out explicitly. We start with<br />

the manifestly covariant field expressions which, in the case of the dipole<br />

fields, have been explicitly verified against the Cohn–Wiebe expressions:<br />

F q 2<br />

F q 1<br />

F3<br />

d<br />

F2<br />

d<br />

= ϕ 3 ζ ∧U,<br />

= ϕ 2 ζ ∧ ˙U − ϕ 3 ˙χζ ∧U,<br />

= ϕ 3 U ∧Σ − 3ϕ 5 ψζ ∧U,<br />

= ϕ 2 ˙U ∧Σ + ϕ 3 [ζ ∧ ˙ Σ ] + ϕ 3 ψU ∧ ˙U − ϕ 3 ˙χU ∧Σ<br />

+ 6ϕ 5 ˙χψζ ∧U − 3ϕ 4 ˙ψζ ∧U − 3ϕ 4 ψζ ∧ ˙U + ϕ 3 ˙ϑζ ∧U,<br />

F d 1<br />

= ϕ 2 [ζ ∧ ¨Σ ] − ϕ 3 ψ[ζ ∧Ü] + ϕ4 ψ ¨χζ ∧U − 2ϕ 3 ˙ψζ ∧ ˙U + 3ϕ 4 ˙χ ˙ψζ ∧U<br />

− ϕ 3 ˙χ[ζ ∧ ˙ Σ ] − ϕ 3¨ηζ ∧U − 3ϕ 5 ˙χ 2 ψζ ∧U + 3ϕ 4 ψ ˙χζ ∧ ˙U,<br />

where<br />

ζ ≡ x − z,<br />

ϕ ≡ (ζ ·U) −1 ,<br />

˙χ ≡ (ζ · ˙U),<br />

¨χ ≡ [ζ ·Ü],<br />

ψ ≡ (ζ ·Σ ),<br />

˙ψ ≡ [ζ · ˙ Σ ],<br />

˙ϑ ≡ [U · ˙ Σ ],<br />

¨η ≡ [ζ · ¨Σ ].<br />

440

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