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  2. Ladder paradox - Wikipedia

    en.wikipedia.org/wiki/Ladder_paradox

    The ladder frame is for a person sitting on the front of the ladder, with x ′ and t ′ being the ladder space and time axes respectively. The blue and red lines, AB and AC, depict the ladder at the time when its front end meets the garage's exit door, in the frame of reference of the garage and the ladder, respectively.

  3. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The following is a list of notable unsolved problems grouped into broad areas of physics. [1]Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.

  4. Bethe–Salpeter equation - Wikipedia

    en.wikipedia.org/wiki/Bethe–Salpeter_equation

    While in QED the ladder approximation caused problems with crossing symmetry and gauge invariance, indicating the inclusion of crossed-ladder terms. In quantum chromodynamics (QCD) this approximation is frequently used phenomenologically to calculate hadron mass and its structure in terms of Bethe—Salpeter amplitudes and Faddeev amplitudes, a ...

  5. Exact solutions in general relativity - Wikipedia

    en.wikipedia.org/wiki/Exact_solutions_in_general...

    Noteworthy examples of vacuum solutions, electrovacuum solutions, and so forth, are listed in specialized articles (see below). These solutions contain at most one contribution to the energy–momentum tensor, due to a specific kind of matter or field. However, there are some notable exact solutions which contain two or three contributions ...

  6. Quantum harmonic oscillator - Wikipedia

    en.wikipedia.org/wiki/Quantum_harmonic_oscillator

    Some trajectories of a harmonic oscillator according to Newton's laws of classical mechanics (A–B), and according to the Schrödinger equation of quantum mechanics (C–H). ). In A–B, the particle (represented as a ball attached to a spring) oscillates back and fo

  7. Alexei Tsvelik - Wikipedia

    en.wikipedia.org/wiki/Alexei_Tsvelik

    Similar approaches proved useful in the understanding of spin ladder materials, of interest as simplified versions of high-Tc materials. [12] As shown by Tsvelik in collaboration with Nersesyan and Shelton, [ 13 ] a two-leg ladder has a simple low-energy representation in terms of four (weakly interacting) massive Majorana fermions, enabling ...

  8. Physical paradox - Wikipedia

    en.wikipedia.org/wiki/Physical_paradox

    The infinitely dense gravitational singularity found as time approaches an initial point in the Big Bang universe is an example of a physical paradox.. A common paradox occurs with mathematical idealizations such as point sources which describe physical phenomena well at distant or global scales but break down at the point itself.

  9. Spherical harmonics - Wikipedia

    en.wikipedia.org/wiki/Spherical_harmonics

    Furthermore, a change of variables t = cos θ transforms this equation into the Legendre equation, whose solution is a multiple of the associated Legendre polynomial P m ℓ (cos θ). Finally, the equation for R has solutions of the form R(r) = A r ℓ + B r −ℓ − 1; requiring the solution to be regular throughout R 3 forces B = 0. [3]

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