User:Narinderph/sandbox

Light Front Dynamics ==: Light front dynamics or null plane field theory are based on the concept of light cone.The concept of light cone was given by the Paul Dirac in 1949. According to Dirac, Light front is a three dimension surface in spacetime formed by the plane wave front advancing with the speed of light.such a surface will be called as front for brevity.An example of light front is given by x^+=x^0+x^3. Definition: A system is characterized by ten fundamental quantities energy,angular momentum,momentum and boost.in conventional Hamiltonian form one works with the dynamical variables referring to the physical conditions at some instant of time, the simplest being given by x^0=0. Dirac found that other form of the relativistic dynamics are possible.For example one can set up a theory in which the physical conditions refer to x^+=0.The resulting dynamics is called light front dynamics.