New answers tagged

2 votes
Accepted

Why impose constraints in (Path Integral) Quantization of Proca action?

The path integral quantization of a (free) massive vector field does not pose any problems, in particular it does not require imposing any additional constraint in the functional integral. A (real) ...
Hyperon's user avatar
  • 4,488
1 vote

Path Integrals for entangled states

Yes, I've worked out exactly how one can analyze entanglement using the path integral in a pair of published papers; first, second. Note that here we're using the discrete sort of path integral more ...
Ken Wharton's user avatar
  • 1,505
12 votes

Feynman diagrams vs old fashioned peturbation theory (OFPT) vs reality

Feynman Diagrams and OFPT are both quantitative tools for determining the things we actually can measure from quantum field theory - transition probabilities between states. By this I mean we expand ...
Wintermute's user avatar
12 votes

Feynman diagrams vs old fashioned peturbation theory (OFPT) vs reality

I don't understand what makes OFPT something different from mathematical fiction. It's not a mathematical fiction because it gives correct results. That is the thing that separates physical theories ...
Rokas Veitas's user avatar
0 votes
Accepted

On Gravity and the Path Integral

If you create a virtual electron with 4 momentum: $$ p^{\mu}_- = (E_-, \vec p_-) $$ then the positron has: $$ p^{\mu}_+ = (-E_-, -\vec p_-) $$ so the total is: $$ p^{\mu}=p^{\mu}_-+p^{\mu}_+ = (0, 0, ...
JEB's user avatar
  • 32.7k

Top 50 recent answers are included