an extra energy term,
Indeed, Penrose [ 21 ] has already shown that an extra
potential arises not only in the case of zero rest mass scalar fields but also in spin-one
and spin-two zero rest mass fields
not necessarily conformally invariant. It is for this reason that an “extra” energy term appears.
This extra term is the source of the “quantum” potential, as needed in DeWitt’s [5 ] approach.
Note that extra terms arise as we add spin and relativity to the structure of the flow.
an extra scalar field can be envisaged as a change in rest energy.
Hence, the quantum potential energy is a necessary part of the covariant formalism and not ad hoc as originally claimed by Heisenberg [14].
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