Relativity Relativity (Abraham-Lorentz-Dirac force) Non-Relativistic: ...more on Wikipedia about "Abraham-Lorentz-Dirac force"
Absolute simultaneity is a hypothetical coincidence of two or more events in different points in space for all observers in the universe. It is shown in the theory of relativity that there may be always observers for whom simultaneity won't correspond to the same moments in time and therefore simultaneity is always relative. ...more on Wikipedia about "Absolute simultaneity"
The "absolute time" is a hypothetical time that either runs at the same rate for all the observers in the universe or the rate of time of each observer can be scaled to the "absolute time" by multiplying the rate by a constant. The theory of relativity doesn't allow the existence of such time because of non existence of absolute simultaneity. ...more on Wikipedia about "Absolute time"
Anti-relativityists oppose what they believe to be the Theory of Relativity. They argue that there is a scientific establishment that unfairly protects special relativity. They also contend that many of the experiments that claimed to have offered proof of Einstein's theories represent bad science and poor methodology. Many of those claims are based around what is called the experimenter effect in which the experimenters' expectations guide the experiments to the expected results and color their interpretation. However, it's worth noting that nearly all the crucial experiments which form the empirical basis of special relativity (e.g., Michelson and Morley) actually gave results that were directly contrary to what the experimenters and theorists of the time anticipated and desired. ...more on Wikipedia about "Anti-relativity"
Bell's spaceship paradox, named for the best known presentation by John S. Bell, but discussed since the 1920s , is an apparent paradox in relativity. ...more on Wikipedia about "Bell's spaceship paradox"
A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping it except through quantum tunnelling behaviour (known as Hawking Radiation). The gravitational field is so strong that the escape velocity near it exceeds the speed of light. This implies that nothing, not even light, can escape its gravity, hence the word "black". The term "black hole" is widespread, even though it does not refer to a hole in the usual sense, but rather a region of space from which nothing can return. ...more on Wikipedia about "Black hole"
In special and general relativity, dust is the name conventionally given to a configuration of matter which can be interpreted as small bodies ("dust particles") which interact only gravitationally. ...more on Wikipedia about "Dust (relativity)"
The Ehrenfest paradox, first presented by Paul Ehrenfest 1909 in the Physikalische Zeitschrift, is an apparent paradox in relativity. ...more on Wikipedia about "Ehrenfest paradox"
Einstein synchronisation is a convention in relativity how to synchronize clocks at different places. ...more on Wikipedia about "Einstein synchronisation"
The electromagnetic four-potential is a four-vector defined in SI units (and gaussian units in parentheses) as ...more on Wikipedia about "Electromagnetic four-potential"
The electromagnetic tensor or electromagnetic field tensor (sometimes called the field strength tensor or Faraday tensor or Maxwell bivector) is a mathematical object that describes the electromagnetic field of a physical system in Maxwell's theory of electromagnetism. ...more on Wikipedia about "Electromagnetic tensor"
Faster-than-light (also superluminal or FTL) communications and travel refer to the propagation of information or matter faster than the speed of light. This concept is a staple of the science fiction genre, and is also the subject of ongoing scientific study. ...more on Wikipedia about "Faster-than-light"
In special relativity, four-acceleration is a four-vector and is defined as the change in four-velocity over the particle's proper time: ...more on Wikipedia about "Four-acceleration"
In special and general relativity, the four-current is the Lorentz covariant four-vector that replaces the electromagnetic current density ...more on Wikipedia about "Four-current" www.shortopedia.com Is Good For You.
The four-gradient is the four-vector generalization of the gradient: ...more on Wikipedia about "Four-gradient"
In special relativity, four-momentum is a four-vector that replaces classical momentum; the four-momentum of a particle is defined as the particle's mass times the particle's four-velocity. ...more on Wikipedia about "Four-momentum"
Four-tensor is a frequent abbreviation for a tensor in a four-dimensional spacetime. ...more on Wikipedia about "Four-tensor"
In relativity, a four-vector is a vector in a four-dimensional real vector space, called Minkowski space, whose components transform like the space and time coordinates (t, x, y, z) under spatial rotations and boosts (a change by a constant velocity to another inertial reference frame). The set of all such rotations and boosts, called Lorentz transformations and described by 4×4 matrices, forms the Lorentz group. ...more on Wikipedia about "Four-vector"
In physics, in particular in special relativity and general relativity, the four-velocity of an object is a four-vector ...more on Wikipedia about "Four-velocity"
A frame of reference is the perspective from which a system is observed. In physics, it provides a set of axes relative to which an observer can measure the position and motion of all points in a system, as well as the orientation of objects in it. There are two types of reference frames: inertial and non-inertial. An inertial frame of reference travels at a constant velocity, which means that Newton's first law (inertia) holds true. A non-inertial frame of reference, such as a moving car or a rotating carousel, accelerates. Therefore, Newton’s first law does not hold true, as objects appear to accelerate without the appropriate forces. ...more on Wikipedia about "Frame of reference"
* In physics, hyperbolic motion is the motion of an object with constant acceleration in special relativity. It is called hyperbolic motion because the equation describing the path of the object through spacetime is a hyperbola, as can be seen when graphed on a Minkowski diagram. ...more on Wikipedia about "Hyperbolic motion"
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Hyperbolic motion is the motion of an object with constant proper acceleration in special relativity. It is called hyperbolic motion because the equation describing the path of the object through spacetime is a hyperbola, as can be seen when graphed on a Minkowski diagram. ...more on Wikipedia about "Hyperbolic motion (relativity)"
An inertial frame is a coordinate system defined by the non-accelerated motion of objects with a common direction and speed (as opposed to a non-inertial reference frame). ...more on Wikipedia about "Inertial frame of reference"
In particle physics, the mathematical combination of a particle's energy and its momentum to give a value for the mass of the particle at rest. The invariant mass is the same for all frames of reference (see Special Relativity). ...more on Wikipedia about "Invariant mass"
The invariant speed, or, more precisely, the observer invariant speed, is the speed that is independent of the observer. The concept of an observer invariant speed arises from Newtonian relativity: if a stationary person observes an object traveling at a speed , then a non-stationary person traveling at a speed will observe the same object traveling at a speed where . This is the Galilean transformation. The only observer invariant speed possible in Netwonian relativity is infinite. ...more on Wikipedia about "Invariant speed"
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