Hi all,(adsbygoogle = window.adsbygoogle || []).push({});

I'm studying quantum field theory and I'm watching video lectures on Harward University web site (Professor Colemann's lectures). Now, in lesson number six at 1h-6 minute a student asks why after trasforming field by a Lorentz transformation he doesn't transform also integration variable (I do not catch very well student's voice...) and Professor Colemann explains that is we transform field AND observer we are not applying Lorentz transformation but a coordinates system change..could you clarify me this point?

Many thanks,

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Lorentz invariance of a field

**Physics Forums | Science Articles, Homework Help, Discussion**