A variable speed of light (VSL) is a feature of a family of hypotheses stating that the speed of light may in some way not be constant, for example, that it varies in space or time, or depending on frequency. Accepted classical theories of physics, and in particular general relativity, predict a constant speed of light in any local frame of reference and in some situations these predict apparent variations of the speed of light depending on frame of reference, but this article does not refer to this as a variable speed of light. Various alternative theories of gravitation and cosmology, many of them non-mainstream, incorporate variations in the local speed of light.
Attempts to incorporate a variable speed of light into physics were made by Robert Dicke in 1957, and by several researchers starting from the late 1980s.
VSL should not be confused with faster than light theories, its dependence on a medium's refractive index or its measurement in a remote observer's frame of reference in a gravitational potential. In this context, the "speed of light" refers to the limiting speed c of the theory rather than to the velocity of propagation of photons.
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A variablespeedoflight (VSL) is a feature of a family of hypotheses stating that the speedoflight may in some way not be constant, for example, that...
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The speedoflight in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately...
massless particles that always move at the speedoflight when in vacuum. The photon belongs to the class of boson particles. As with other elementary...
finite invariant speed does not exist (the only invariant speed predicted by Newtonian mechanics is infinity). Variablespeedoflight Red Queen's race...
speed of light could be energy-dependent, enabling models with a variablespeedoflight. If the two metrics are dynamical and interact, a first possibility...
theory of relativity against a competing 1908 emission theory by Walther Ritz that postulated a variablespeedoflight dependent on the velocity of the...
astrophysicist John Webb, at the University of Cambridge, worked on the theory of a variablespeedoflight, through investigating quasars, the most distant...
explanations such as a variablespeedoflight more appropriate? Hubble tension: If ΛCDM is correct, why are measurements of the Hubble constant failing...
Equations and a VariableSpeedofLight (Proceedings of the Mathematical and Physical Society of Egypt, No. 1, Vol. 1) - (1937) The Principle of Indeterminacy...
but are other possible explanations such as a variablespeedoflight more appropriate? Origin and future of the universe: How did the conditions for anything...
authorities. Speed limits may also be variable, or in some places nonexistent, such as on most of the Autobahnen in Germany. The first numeric speed limit for...
special relativity or Variablespeedoflight. 1632 – Galileo Galilei writes about the relativity of motion and that some forms of motion are undetectable;...
change in emitted light or by something partly blocking the light, so variable stars are classified as either: Intrinsic variables, whose luminosity actually...
International, Swiss construction firm Value of a Statistical Life, or simply Value of life Variablespeedoflight, a theory in physics Venezuelan Summer League...
A Cepheid variable (/ˈsɛfi.ɪd, ˈsiːfi-/) is a type ofvariable star that pulsates radially, varying in both diameter and temperature. It changes in brightness...
to: Variable c, variablespeedoflightvariable declaration of "c" in computer programming C variable types and declarations M33 Var C, see List of most...
speedof sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speedof sound...
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