content_image/302029.jpg content_image/302035.jpg content_image/302036.jpg content_image/302037.jpg
## F.4.3 Comparison 

## Massive Field, Charge, with Recoil 

It turns out with 

the Proca result, Eq. (F.91), is unchanged. 

<img src='content_image/302029.jpg'>

<img src='content_image/302035.jpg'>

<img src='content_image/302036.jpg'>

<img src='content_image/302037.jpg'>

