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  2. List of relativistic equations - Wikipedia

    en.wikipedia.org/wiki/List_of_relativistic_equations

    Lorentz factor. where and v is the relative velocity between two inertial frames. For two frames at rest, γ = 1, and increases with relative velocity between the two inertial frames. As the relative velocity approaches the speed of light, γ → ∞. Time dilation (different times t and t' at the same position x in same inertial frame)

  3. Special relativity - Wikipedia

    en.wikipedia.org/wiki/Special_relativity

    e. In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time. In Albert Einstein 's 1905 paper, On the Electrodynamics of Moving Bodies, the theory is presented as being based on just two postulates: [p 1][1][2] The laws of physics are invariant (identical ...

  4. Mass in special relativity - Wikipedia

    en.wikipedia.org/wiki/Mass_in_special_relativity

    The term mass in special relativity usually refers to the rest mass of the object, which is the Newtonian mass as measured by an observer moving along with the object. The invariant mass is another name for the rest mass of single particles. The more general invariant mass (calculated with a more complicated formula) loosely corresponds to the ...

  5. Relativistic quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Relativistic_quantum_mechanics

    e. In physics, relativistic quantum mechanics (RQM) is any Poincaré covariant formulation of quantum mechanics (QM). This theory is applicable to massive particles propagating at all velocities up to those comparable to the speed of light c, and can accommodate massless particles. The theory has application in high energy physics, [1] particle ...

  6. Einstein field equations - Wikipedia

    en.wikipedia.org/wiki/Einstein_field_equations

    v. t. e. In the general theory of relativity, the Einstein field equations (EFE; also known as Einstein's equations) relate the geometry of spacetime to the distribution of matter within it. [1] The equations were published by Albert Einstein in 1915 in the form of a tensor equation [2] which related the local spacetime curvature (expressed by ...

  7. Energy–momentum relation - Wikipedia

    en.wikipedia.org/wiki/Energy–momentum_relation

    This equation holds for a body or system, such as one or more particles, with total energy E, invariant mass m 0, and momentum of magnitude p; the constant c is the speed of light. It assumes the special relativity case of flat spacetime [1] [2] [3] and that the particles are free.

  8. Spacetime - Wikipedia

    en.wikipedia.org/wiki/Spacetime

    In special relativity, ... Hyperboloids of two sheets and one sheet. ... The Galilean formula is a special case of the relativistic formula applicable to low ...

  9. Formulations of special relativity - Wikipedia

    en.wikipedia.org/wiki/Formulations_of_special...

    Einstein's two postulates. As formulated by Albert Einstein in 1905, the theory of special relativity was based on two main postulates: The principle of relativity: The form of a physical law is the same in any inertial frame (a frame of reference that is not accelerating in any direction). The speed of light is constant: In all inertial frames ...