mark_horn@sbcglobal.net
Mar5-06, 04:00 AM
02-MAR-2006
In Feynman's 1953 QED lectures (Quantum Electrodynamics, Perseus 1998),
f_+ is defined as a function of s^2, the interval over which the
function is modified. He specifies that f_+ is to be used instead of
delta_+, when s^2 = 1/lambda^2, when lambda is an arbitrarily large
number.
On the plot of f_+(s^2), s^2 = t^2 - r^2, I'm wondering what (physical)
meaning might be attached to points that would lie off the curve
(either side), for r >> s.
Cheers,
mark
In Feynman's 1953 QED lectures (Quantum Electrodynamics, Perseus 1998),
f_+ is defined as a function of s^2, the interval over which the
function is modified. He specifies that f_+ is to be used instead of
delta_+, when s^2 = 1/lambda^2, when lambda is an arbitrarily large
number.
On the plot of f_+(s^2), s^2 = t^2 - r^2, I'm wondering what (physical)
meaning might be attached to points that would lie off the curve
(either side), for r >> s.
Cheers,
mark