Was Physiker unter » Renormalisierbarkeit « verstehen
A renormalizing physical theory is a quantum field theory in which the infinities that appear in calculations can be systematically absorbed into a finite number of physical parameters – typically masses, charges, and field normalizations – so that all measurable predictions remain finite and well-defined.Note: Not only Quantum field theories often produce divergent (infinite) quantities when you compute things like particle self-energies or interaction strengths.
Renormalization is the procedure that:
- Identifies which parts of a calculation diverge.
- Redefines a small set of physical quantities (mass, charge, coupling constants, etc.) to absorb those divergences.
- Leaves behind, for all of them, finite predictions that match experiments.
A theory is called renormalizable (or "renormalizing") if this procedure requires only a finite number of redefinitions. If infinitely many parameters were needed, the theory would lose predictive power.
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