- #1
Dilatino
- 12
- 0
I have just learned from nice article
http://motls.blogspot.com/2013/12/edward-witten-what-every-quantum.html
that the propagator of a massive particle can be rewritten as an integral over the so-called Schwinger parameter t as
$$
\frac{1}{p^2 + m^2} = \int\limits_0^\infty dt \exp(-t(p^2 + m^2))
$$
In addition, in the blog article it is said that this Schwinger parameter p can be interpreted as the proper length of the propagator. I don't see this, so can somebody give a derivation/further explanation?
http://motls.blogspot.com/2013/12/edward-witten-what-every-quantum.html
that the propagator of a massive particle can be rewritten as an integral over the so-called Schwinger parameter t as
$$
\frac{1}{p^2 + m^2} = \int\limits_0^\infty dt \exp(-t(p^2 + m^2))
$$
In addition, in the blog article it is said that this Schwinger parameter p can be interpreted as the proper length of the propagator. I don't see this, so can somebody give a derivation/further explanation?