2024-06-23   37301

Free Massless Scalar Quantum Fields

Articles 00980 and 30983 studied the model of a single free scalar quantum field with a nonzero single-particle mass (m>0). When m=0, the model acquires a new symmetry called a shift symmetry. This article introduces two versions of the model with m=0: one in which the shift symmetry is spontaneously broken, and one in which observables are required to be invariant under the shift symmetry.

Download PDF (23 pages, 286 KB)

Revision history

www.cphysics.org updated 2024-07-11