It is part of Extended Electrodynamics in a Plasma Universe (See The Thunderbolts Project for the PU stuff https://www.thunderbolts.info ).
See among many others:
L.M. Hively & G.C Giakos, “Toward a more complete electromagnetic theory”, Int. J. Signals & Imaging Syst. Engr., 5, 3-10(2012).
L.M.Hively, “Methods and Apparatus for Generating and/or Utilizing Scalar-Longitudinal Waves”, US Patent #9,306,527, (Apr. 6,2106).
L.M.Hively & O.Keller, “Electrodynamics in curved space-time: Free space longitudinal wave propagation”, Phys. Essays, 32 (3), Sept 2019.
List of patents by Raymond C. Gelinas assigned to Honeywell: (A Vector Potential is a scalar field.)
4,429,280, 31 Jan 1984, Apparatus and Method for Demodulation of a Modulated Curl-Free Magnetic Vector Potential.
4,429,288, 31 Jan 1984, Apparatus and Method for Modulation of a Curl-Free Magnetic Vector Potential Field.
4,432,098, 14 Feb 1984, Apparatus and Method for Transfer of Information by Means of a Curl-Free Magnetic Vector Potential Field.
4,447,779, 8 May 1984, Apparatus and Method for Determination of a Receiving Device Utilizing a Curl-Free Magnetic Vector Potential Field.
4,605,897, 12 Aug 1986, Apparatus and Method for Distance Determination Between a Receiving Device and a Transmitting Device Utilizing a Curl-Free Magnetic Vector Potential Field.
4,491,795, 1 Jan 1985, Josephson Junction Interferometer Device for Detection of Curl-Free Magnetic Vector Potential Fields.
Also, you can find a good article in Scientific American of April 1989, pp. 56-62, “Quantum Interference and the Aharonov-Bohm Effect” by Yoseph Imry & Richard Webb.
Y. Aharnov & D. Bohm, “Further discussion of the role of electromagnetic potentials in the quantum theory”, Phys. Rev., 130, 1625-1632 (1963).
Y. Aharonov and D. Bohm, “Significance of Electromagnetic Potentials in the Quantum Theory” Phys. Rev. 115, 485 – Published 1 August 1959 https://journals.aps.org/pr/abstract/10.1103/PhysRev.115.485
Quantum Physics might have a fundamental problem with energy/time. https://arxiv.org/abs/1908.05273