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  2. Non-relativistic spacetime - Wikipedia

    en.wikipedia.org/wiki/Non-relativistic_spacetime

    The classic example of a non-relativistic spacetime is the spacetime of Galileo and Newton. It is the spacetime of everyday "common sense". [1] Galilean/Newtonian spacetime assumes that space is Euclidean (i.e. "flat"), and that time has a constant rate of passage that is independent of the state of motion of an observer, or indeed of anything external.

  3. Relativistic quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Relativistic_quantum_mechanics

    As such, the equation cannot be applied to the description of atoms, since the electron is a spin ⁠ 1 / 2 ⁠ particle. In the non-relativistic limit the equation reduces to the Schrödinger equation for a spinless charged particle in an electromagnetic field: [18]

  4. Two-body problem in general relativity - Wikipedia

    en.wikipedia.org/wiki/Two-body_problem_in...

    In the non-relativistic Kepler problem, a particle follows the same perfect ellipse (red orbit) eternally. General relativity introduces a third force that attracts the particle slightly more strongly than Newtonian gravity, especially at small radii.

  5. Free particle - Wikipedia

    en.wikipedia.org/wiki/Free_particle

    A free particle with mass in non-relativistic quantum mechanics is described by the free Schrödinger equation: (,) = (,) where ψ is the wavefunction of the particle at position r and time t . The solution for a particle with momentum p or wave vector k , at angular frequency ω or energy E , is given by a complex plane wave :

  6. Quantum field theory - Wikipedia

    en.wikipedia.org/wiki/Quantum_field_theory

    The current standard model of particle physics is based on ... The foregoing procedure is a direct application of non-relativistic quantum mechanics and can be ...

  7. Relativistic particle - Wikipedia

    en.wikipedia.org/wiki/Relativistic_particle

    In particle physics, a relativistic particle is an elementary particle with kinetic energy greater than or equal to its rest-mass energy given by Einstein's relation, =, or specifically, of which the velocity is comparable to the speed of light. [1]

  8. Ghirardi–Rimini–Weber theory - Wikipedia

    en.wikipedia.org/wiki/Ghirardi–Rimini–Weber...

    GRW is a non relativistic theory, its relativistic extension for non-interacting particles has been investigated by Tumulka, [18] while interacting models are still under investigation. The master equation of the GRW theory describes a decoherence process according to which the off-diagonal elements of the statistical operator are suppressed ...

  9. Fermi gas - Wikipedia

    en.wikipedia.org/wiki/Fermi_gas

    A model of the atomic nucleus showing it as a compact bundle of the two types of nucleons: protons (red) and neutrons (blue). As a first approximation, the nucleus can be treated as composed of non-interacting proton and neutron gases. The three-dimensional isotropic and non-relativistic uniform Fermi gas case is known as the Fermi sphere.