Is the Concept of Potentials Incompatible with Relativity?

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SUMMARY

The discussion centers on the incompatibility of the concept of potentials with the principles of relativity, particularly in the context of quantum mechanics (QM). It highlights that in nonrelativistic quantum mechanics, such as the hydrogen atom problem using the Coulomb potential in the Schrödinger equation, the electron appears to receive information instantaneously about changes to the proton's position. This instantaneous transfer of information contradicts the tenets of relativity. The conversation concludes that the true integration of quantum theory with special relativity (SR) is achieved through relativistic quantum field theory, which eliminates the use of potentials.

PREREQUISITES
  • Understanding of quantum mechanics, particularly the Schrödinger equation
  • Familiarity with special relativity principles
  • Knowledge of relativistic quantum field theory
  • Concept of Hamiltonians in quantum mechanics
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  • Study the implications of the Coulomb potential in quantum mechanics
  • Explore the differences between nonrelativistic and relativistic Hamiltonians
  • Learn about the fundamentals of relativistic quantum field theory
  • Investigate the concept of information transfer in the context of relativity
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Physicists, students of quantum mechanics, and anyone interested in the intersection of quantum theory and relativity will benefit from this discussion.

preet0283
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please elaborate ..." particle quantum mechanics is valid in the nonrelativistic regime by definition ...it refuses to obey relativity ...this is not bcoz we write non relativistic hamiltonians bt the concept of potentials is untenable in relativity ...since it assumes the transfer of information at an infinite speed"what do we mean when we say that the concept of potentials is untenable
 
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Consider the hydrogen atom problem in QM, in which you put the Coulomb potential in the Schrödinger equation. Now ask yourself what happens if the proton is moved suddenly? According to QM the electron knows about this instantly, without any retardation. For this reason the true merger between quantum theory and SR is not relativistic quantum mechanics, but rather relativistic quantum field theory, which does not use potentials.

I wouldn't agree with the part of the statement that says, "this is not bcoz we write non relativistic hamiltonians", because that is clearly part of the problem. And not surprisingly, when the relativistic Hamiltonian is quantized, you end up with a theory that makes more accurate predictions.
 

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