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  2. Observer effect (physics) - Wikipedia

    en.wikipedia.org/wiki/Observer_effect_(physics)

    In physics, the observer effect is the disturbance of an observed system by the act of observation. [1] [2] This is often the result of utilising instruments that, by necessity, alter the state of what they measure in some manner.

  3. Pauli exclusion principle - Wikipedia

    en.wikipedia.org/wiki/Pauli_exclusion_principle

    [2]: 123–125 The Pauli exclusion principle underpins many properties of everyday matter, from its large-scale stability to the chemical behavior of atoms. Half-integer spin means that the intrinsic angular momentum value of fermions is ℏ = h / 2 π {\displaystyle \hbar =h/2\pi } ( reduced Planck constant ) times a half-integer (1/2, 3/2, 5/ ...

  4. Matter wave - Wikipedia

    en.wikipedia.org/wiki/Matter_wave

    The concept that matter behaves like a wave was proposed by French physicist Louis de Broglie (/ d ə ˈ b r ɔɪ /) in 1924, and so matter waves are also known as de Broglie waves. The de Broglie wavelength is the wavelength , λ , associated with a particle with momentum p through the Planck constant , h : λ = h p . {\displaystyle \lambda ...

  5. Don't Matter - Wikipedia

    en.wikipedia.org/wiki/Don't_Matter

    "Don't Matter" is a reggae fusion–R&B song by Senegalese-American singer Akon from his second studio album, Konvicted (2006). [1] The song was released as the album's third single in January 2007. In April of that year, it became Akon's second U.S. number-one single.

  6. Penrose interpretation - Wikipedia

    en.wikipedia.org/wiki/Penrose_interpretation

    Penrose's idea is inspired by quantum gravity because it uses both the physical constants and .It is an alternative to the Copenhagen interpretation which posits that superposition fails when an observation is made (but that it is non-objective in nature), and the many-worlds interpretation, which states that alternative outcomes of a superposition are equally "real," while their mutual ...

  7. Massless particle - Wikipedia

    en.wikipedia.org/wiki/Massless_particle

    Weyl fermions in matter are like phonons, which are also quasiparticles. No real particle that is a Weyl fermion has been found to exist, and there is no compelling theoretical reason that requires them to exist. Neutrinos were originally thought to be massless – and possibly.

  8. Gravitational interaction of antimatter - Wikipedia

    en.wikipedia.org/wiki/Gravitational_interaction...

    The CPT theorem implies that the difference between the properties of a matter particle and those of its antimatter counterpart is completely described by C-inversion. Since this C-inversion does not affect gravitational mass, the CPT theorem predicts that the gravitational mass of antimatter is the same as that of ordinary matter. [5]

  9. Aether theories - Wikipedia

    en.wikipedia.org/wiki/Aether_theories

    Isaac Newton suggests the existence of an aether in the Third Book of Opticks (1st ed. 1704; 2nd ed. 1718): "Doth not this aethereal medium in passing out of water, glass, crystal, and other compact and dense bodies in empty spaces, grow denser and denser by degrees, and by that means refract the rays of light not in a point, but by bending them gradually in curve lines? ...