Quantum field propagator for extended-objects in the microcanonical ensemble and the S-matrix formulation

DIEGO JULIO CIRILO-LOMBARDO

PHYSICS LETTERS B

ELSEVIER SCIENCE BV

Año: 2006 p. 133 - 138

0370-2693

Starting with the well-known Nambu–Goto action for an N-extended body system the propagator in the microcanonical ensemble is explicitlycomputed. This propagator is independent of the temperature and, in contrast with the previous references, takes account on all the non-localeffects produced by the extended objects (e.g., strings) in interaction. The relation between relativistic quantum field theories in the microcanonicalapproach and the pure S-matrix formulation is established and analyzed.