Quantum Fields and Off-Shell Sciences

Dear Colleagues,

Intensive experimental studies on light–matter interactions and their associated technological breakthroughs, especially done in the field of dressed photon research, have led to a growing concern regarding unsettled off-shell quantum field interactions. In order to respond to the demand of this new tide, a new initiative has been recently launched. The aim of this Special Issue is to promote the progress of such research activities from a wider perspective, not necessarily limited to dressed photon studies. Therefore, the scope of this Special Issue covers, for instance, quantum probability theory, quantum walk model, quantum measurement theory, micro–macro duality, category theory, dynamics, vortex structure of spacetime, off the mass-shell property of quantum field and symmetry, and/or symmetry breaking of the quantum fields.

Dr. Motoichi Ohtsu
Guest Editor

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