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According to pilot wave theory, the point particle and the matter wave are both real and distinct physical entities (unlike standard quantum mechanics, which postulates no physical particle or wave entities, only observed wave-particle duality). The pilot wave guides the motion of the point particles as described by the guidance equation.
The theory was historically developed in the 1920s by de Broglie, who, in 1927, was persuaded to abandon it in favour of the then-mainstream Copenhagen interpretation. David Bohm, dissatisfied with the prevailing orthodoxy, rediscovered de Broglie's pilot-wave theory in 1952.
In the framework of the de Broglie–Bohm theory, the quantum potential is a term within the Schrödinger equation which acts to guide the movement of quantum particles. . The quantum potential approach introduced by Bohm [1] [2] provides a physically less fundamental exposition of the idea presented by Louis de Broglie: de Broglie had postulated in 1925 that the relativistic wave function ...
In his theory, every particle had an associated, hidden "pilot wave" which served to guide its trajectory through space. The theory was subject to criticism at the Congress, particularly by Wolfgang Pauli, which de Broglie did not adequately answer; de Broglie abandoned the theory shortly thereafter.
The theory takes place in a single spacetime, is non-local, and is deterministic. The simultaneous determination of a particle's position and velocity is subject to the usual uncertainty principle constraint. The theory is considered to be a hidden-variable theory, and by embracing non-locality it satisfies Bell's inequality.
The particle configuration determines the actual measurement outcome —e.g., whether Schrödinger's cat is dead or alive or whether Wigner's friend has measured 0 or 1— even if the wave function is a superposition. Indeed, according to the De Broglie-Bohm theory, the wave function never collapses on the fundamental level.
This is a theory that Philip Baum sees as second-most likely after pilot suicide. He has demonstrated that there is an underfloor area just outside the flight deck door which could conceal a person.
The pilot wave theory states that an electron is both a wave and a particle all of the times--not just when it is being observed. Freeman states that we can see is approximately 5 % of all the matter, dark matter accounts for another 23%, and lastly, dark energy accounts for the remaining 72% of all matter.