View Single Post
Phiphy
#1
Oct18-09, 05:14 PM
P: 16
When we write down a Lagragian for a quantum field theory, it is said that it should not depend on the second and higher order time and space derivatives of [tex]\phi[/tex], because we want the equation of motion(EOM) to be at most second order. Why is it so important. What trouble will a higher order EOM cuase in physics? Could anyone give me some examples? Thanks.
Phys.Org News Partner Physics news on Phys.org
Optimum inertial self-propulsion design for snowman-like nanorobot
The Quantum Cheshire Cat: Can neutrons be located at a different place than their own spin?
A transistor-like amplifier for single photons