Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1994-06-10
Int.J.Mod.Phys.A10:2703-2732,1995
Physics
High Energy Physics
High Energy Physics - Theory
30 pages
Scientific paper
10.1142/S0217751X95001273
It is argued that renormalisation group flow can be interpreted as being a Hamiltonian vector flow on a phase space which consists of the couplings of the theory and their conjugate \lq\lq momenta", which are the vacuum expectation values of the corresponding composite operators. The Hamiltonian is linear in the conjugate variables and can be identified with the vacuum expectation value of the trace of the energy-momentum operator. For theories with massive couplings the identity operator plays a central role and its associated coupling gives rise to a potential in the flow equations. The evolution of any quantity , such as $N$-point Green functions, under renormalisation group flow can be obtained from its Poisson bracket with the Hamiltonian. Ward identities can be represented as constants of the motion which act as symmetry generators on the phase space via the Poisson bracket structure.
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