28 Apr '13 01:28>
Originally posted by RJHindsThe particulars of quantum field theory are determined by observation and data. The theory itself is a mathematical system known as a field: a set of objects that obey certain "field axioms" involving two binary operations and a relation. The Wightman axioms are no more a part of physics, really, than the field axioms. They're additional assumptions about the field featured in quantum field theory that enable one to prove mathematical propositions about the field in a rigorous fashion. The validity of the Wightman axioms are not really dependent on particular properties of the universe. Here's one:
How about Wightman axioms?
http://en.wikipedia.org/wiki/Wightman_axioms
For each test function f, there exists a set of operators which, together with their adjoints, are defined on a dense subset of the Hilbert state space containing the vacuum. The fields A are operator-valued tempered distributions. The Hilbert state space is spanned by the field polynomials acting on the vacuum (cyclicity condition).
The axiom is stating something about the existence of purely mathematical entities called operators, not anything that is physical. We're delving deep into the enchanted forest of theoretical (i.e. mathematical) physics.
You might do better claiming that the statement "Physical laws are invariant across space" is a physical axiom. Most physicists probably take it for granted, but then again many might say it's "just a theory" that has held up without fail under repeated observation.