Expanding quantum Proca field

@misc{damski2026expanding,
  title = {{Expanding quantum Proca field}},
  author = {Bogdan Damski},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.00014},
  eprint = {2610.00014},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.00014},
}

TY  - UNPB
TI  - Expanding quantum Proca field
AU  - Bogdan Damski
PY  - 2026
DA  - 2026/10/01
PB  - arXiv
DO  - 10.48550/arxiv.2610.00014
UR  - https://arxiv.org/abs/2610.00014
AB  - We consider the Proca theory of a real massive vector field coupled to an external current. This theory allows for non-conservation of the charge associated with the external current. It is so because the total conserved current is given by the sum of the external current and the internal current associated with the Proca field, neither of which is required to be conserved separately. Moreover, this theory admits the quantum description of a longitudinal field generated by a charge distribution. We explore both features by studying the quantum dynamics underlying the causal formation of the Proca field following the charge-creation process. The resulting non-equilibrium quantum state exhibits an expanding Proca field accompanied by a moving front. We compare this state with the one representing the corresponding static Proca field and identify fundamental differences between these states. The quantization of the Proca theory in the presence of an external current is discussed in detail. General results concerning the quantum dynamics of this theory are presented. Particular emphasis is placed on the problem of the instantaneous switching-on of an otherwise static external current. An intriguing shockwave structure is found in the point-charge creation problem, the extended-charge creation problem is also discussed.
ER  -