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Single-Particle Electrodynamics - Assassination Science

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− 3 2 t2 ( ˙v· ˙σ) ˙v − 3 4 t2 (¨v·σ) ˙v − 2t(r ′· ˙v)¨σ − t(r ′·¨v) ˙σ<br />

+ 2t(r ′· ˙v)( ˙v·σ) ˙v + (r ′· ˙v) 2 ˙σ + 1 6 t3 ....<br />

σ − 1 3 t3 ( ˙v·σ) ... v − t 3 ( ˙v· ˙σ)¨v<br />

− t 3 ( ˙v· ¨σ) ˙v − 1 2 t3 (¨v·σ)¨v − t 3 (¨v· ˙σ) ˙v − 1 3 t3 ( ... v·σ) ˙v<br />

− 1 2 t3 ˙v 2 ( ˙v·σ) ˙v − 3 2 t2 (r ′· ˙v) ... σ − 3 2 t2 (r ′·¨v)¨σ − 1 2 t2 (r ′·... v) ˙σ<br />

− 3 2 t2 ˙v 2 (r ′· ˙v) ˙σ + 9 4 t2 (r ′· ˙v)( ˙v·σ)¨v + 9 2 t2 (r ′· ˙v)( ˙v· ˙σ) ˙v<br />

+ 9 4 t2 (r ′· ˙v)(¨v·σ) ˙v + 3 2 t2 (r ′·¨v)( ˙v·σ) ˙v + 3t(r ′· ˙v) 2 ¨σ<br />

+ 3t(r ′· ˙v)(r ′·¨v) ˙σ − 3t(r ′· ˙v) 2 ( ˙v·σ) ˙v − (r ′· ˙v) 3 ˙σ + O(ε 4 ), (G.59)<br />

¨σ r ′ ′(t) = ¨σ − ( ˙v·σ) ˙v + t... σ − 3 2 t( ˙v·σ)¨v − 3t( ˙v· ˙σ) ˙v − 3 t(¨v·σ) ˙v<br />

2<br />

− 2(r ′· ˙v)¨σ − (r ′·¨v) ˙σ + 2(r ′· ˙v)( ˙v·σ) ˙v + 1 ....<br />

2 t2 σ − t 2 ( ˙v·σ) v<br />

...<br />

− 3t 2 ( ˙v· ˙σ)¨v − 3t 2 ( ˙v· ¨σ) ˙v − 3 2 t2 (¨v·σ)¨v − 3t 2 (¨v· ˙σ) ˙v<br />

− t 2 ( ... v·σ) ˙v − 3 2 t2 ˙v 2 ( ˙v·σ) ˙v − 3t(r ′· ˙v) ... σ − 3t(r ′·¨v)¨σ − t(r ′·... v) ˙σ<br />

− 3t ˙v 2 (r ′· ˙v) ˙σ + 9 2 t(r′· ˙v)( ˙v·σ)¨v + 9t(r ′· ˙v)( ˙v· ˙σ) ˙v<br />

+ 9 2 t(r′· ˙v)(¨v·σ) ˙v + 3t(r ′·¨v)( ˙v·σ) ˙v + 3(r ′· ˙v) 2 ¨σ + 3(r ′· ˙v)(r ′·¨v) ˙σ<br />

− 3(r ′· ˙v) 2 ( ˙v·σ) ˙v + O(ε 3 ).<br />

(G.60)<br />

Substituting t = t ret ≡ −R, we find<br />

σ ret ′ = σ − r d ˙σ + 1 2 r2 d ¨σ − 1 2 r2 d ( ˙v·σ) ˙v + 1 2 r dr s (n s· ˙v) ˙σ − 1 ...<br />

6 r3 d σ<br />

− 1 8 r3 d ˙v2 ˙σ − 1 8 r3 d (n d· ˙v) 2 ˙σ + 1 12 r3 d (n d·¨v) ˙σ + 1 4 r3 d ( ˙v·σ)¨v<br />

+ 1 2 r3 d ( ˙v· ˙σ) ˙v + 1 4 r3 d (¨v·σ) ˙v − 1 2 r2 d r s (n s· ˙v)¨σ − 1 4 r2 d r s (n s·¨v) ˙σ<br />

+ 1 2 r2 d r s (n s· ˙v)( ˙v·σ) ˙v − 1 4 r drs 2 (n s· ˙v) 2 ˙σ + 1 ....<br />

24 r4 d σ + 1 8 r4 d ˙v2 ¨σ<br />

465

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