/sci/ - Science & Math

>>6400068
A vector to the power of -1?
But yeah, it's only linear (in the field equations) if the exponent is 1 or 2.
Btw. if you want a theory which is silly in terms of non-linearity, check out
http://en.wikipedia.org/wiki/Sine_gordon_equation

pic related: reality fucks with my brain

Regarding renormalization and friends, I watch
http://ocw.mit.edu/courses/physics/8-851-effective-field-theory-spring-2013/video-lectures/lecture-1-introduction-to-effective-field-theory-eft/
tonight and might be continuing it the next week. Feel free to join.

>>6400080
I didn't intend to point you to that answer in particular, but the thread in general. I couldn't tell you more than they say there. And what they say is that it works only for certain unphysical theories, e.g. 2dim models.
And it's your job to make it right ;)