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The problem of causality is analyzed in the context of Local Quantum Field Theory. Contrary to recent claims, it is shown that apparent noncausal behaviour is due to a lack of the notion of sharp localizability for a relativistic quantum system. (Replaced corrupted file)
We derive general covariant coupled equations of QCD describing the tetraquark in terms of a mix of four-quark states $2q2bar q$, and two-quark states $qbar q$. The coupling of $2q2bar q$ to $qbar q$ states is achieved by a simple contraction of a fo
The evolution of the distribution-theoretic methods in perturbative quantum field theory is reviewed starting from Bogolyubovs pioneering 1952 work with emphasis on the theory and calculations of perturbation theory integrals.
Tunneling in quantum field theory is worth understanding properly, not least because it controls the long term fate of our universe. There are however, a number of features of tunneling rate calculations which lack a desirable transparency, such as t
We investigate the entropy bound for local quantum field theory in this paper. Both the bosonic and fermionic fields confined to an asymptotically flat spacetime are examined. By imposing the non-gravitational collapse condition, we find both of them
We discuss the renormalisation of the initial value problem in quantum field theory using the two-particle irreducible (2PI) effective action formalism. The nonequilibrium dynamics is renormalised by counterterms determined in equilibrium. We emphasi