Abstract
In 1927 Louis de Broglie proposed an alternative approach to standard quantum mechanics known as the double solution program (DSP) where particles are represented as bunched fields or solitons guided by a base (weaker) wave. DSP evolved as the famous de Broglie-Bohm pilot wave interpretation (PWI) also known as Bohmian mechanics but the general idea to use solitons guided by a base wave to reproduce the dynamics of the PWI was abandoned. Here we propose a nonlinear scalar field theory able to reproduce the PWI for the Schrödinger and Klein–Gordon guiding waves. Our model relies on a relativistic ‘phase harmony’ condition locking the phases of the solitonic particle and the guiding wave. We also discuss an extension of the theory for the N particles cases in presence of entanglement and external (classical) electromagnectic fields.
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Notes
In the rest of this article contravariant and covariant vectors \(F^\mu\), \(F_\mu\) are often written in the compact form F to simplify the notations. With this convention the scalar product reads \(A_\mu B^\mu :=AB\).
We stress that in order to identify \(\frac{d}{d\tau }\ln {[\mathcal {M}_\Psi (\tau )]}\) and \(\frac{d}{d\tau }\ln {[\mathcal {M}_u(\tau )]}\) we must use \(\mathcal {M}_u(x)\simeq \mathcal {M}_u(z)+ O(\xi )\). The time derivative \(\partial_t\mathcal {M}_u(x)\) computed in the rest frame \(\mathcal {R}_\tau\) includes the derivative of \(O(\xi )\). Using methods developed in Appendix 1 we can indeed justify the condition \(\frac{d}{d\tau }\ln {[\mathcal {M}_\Psi (\tau )]}=\frac{d}{d\tau }\ln {[\mathcal {M}_u(\tau )]}\).
We stress that in order to neglect the self electric energy associated with the electric charge distribution we must have \(\frac{e^2}{a}\ll \frac{b}{\omega_0}=\frac{1}{\omega_0a^2}\), i.e. \(a\ll \frac{(\omega_0)^{-1}}{e^2}\). Moreover, the Sommerfeld structure fine constant \(\alpha =\frac{e^2}{4\pi }\simeq 1/137\) is very small and the previous condition is easy to fulfill for droplet of extension a smaller or equal to the Compton wavelength of the particle \((\omega_0)^{-1}.\)
We note that at the beginning of the present research the author was motivated by an extension of Gueret and Vigier nonlinear equation [42]: \(D^2u=\frac{\Box |u|}{|u|}u-\mathcal {M}_\Psi ^2u\) (in [42] the mass \(\mathcal {M}_\Psi\) was replaced by \(\omega_0\)) that leads directly to the relation \((\partial \varphi +eA)^2=\mathcal {M}_\Psi ^2=(\partial S+ eA)^2\). This implies \(\forall x\) \(\partial S =\partial \phi\), i.e., \(S(x)\equiv \varphi (x)\) (the contact between S and \(\varphi\) is thus stronger than in the phase harmony considered in this work). However, it lets f(x) relatively unconstrained. In fact, from the conservation laws \(\partial [a^2(\partial S+eA)]=0\), \(\partial [f^2(\partial S+eA)]=0\) (with \(S=\varphi\)) we deduce \(v_\psi \partial \log {[f/a]}=0\) meaning that the ratio f/a is constant along a current line. This is a problem since a(x) can increase or decrease and this goes against the notion of a permanent particle (for more on this issue see [19]).
This equation can be derived from the definition \(\mathcal {M}^2_u:=(\partial \varphi +eA)^2\) and by applying the gradient operator \(\partial\) on both sides of the relation.
Note that we have also \(\delta \tau =\int_0^{t_1} dt_1\sqrt{(1-({\textbf {a}}(0)t_1)^2)}\simeq t_1\)
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Drezet, A. Quantum Solitodynamics: Non-linear Wave Mechanics and Pilot-Wave Theory. Found Phys 53, 31 (2023). https://doi.org/10.1007/s10701-023-00671-4
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DOI: https://doi.org/10.1007/s10701-023-00671-4