equivalence principle


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equivalence principle

(i-kwiv -ă-lĕns) The principle that, on a local scale, the physical effects of a uniform acceleration of some frame of reference imitates completely the behavior in a uniform gravitational field. This equivalence of the two frames of reference was introduced by Albert Einstein in his general theory of relativity. It is a generalization of the observed direct proportionality between gravitational and inertial mass.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

equivalence principle

[i′kwiv·ə·ləns ‚prin·sə·pəl]
(relativity)
In general relativity, the principle that the observable local effects of a gravitational field are indistinguishable from those arising from acceleration of the frame of reference. Also known as Einstein's equivalency principle; principle of equivalence.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
As far as Einstein gravity is concerned, two EP are generally contemplated: the weak equivalence principle (WEP) and the Einstein one (EEP).
We have considered the case for the impact of acceleration in special relativity and have derived an expression for the time dilation in an accelerated frame of reference, based on the equivalence principle of general relativity.
Once the PEC current is solved, the scattering electric and magnetic currents can be computed using equivalence principle as
Einstein's Equivalence Principle requires that any two photons of different frequencies, emitted at the same time from the same source and traveling through the same gravitational fields, should arrive at Earth at exactly the same time.
It is to be noted that when the vector and scalar potential terms are equally important, the equivalence principle can be represented by four scalar field components, two for the tangential components of [H.sub.1] and two for the tangential components of [E.sub.1].
Li, "A simple technique for optimizing the implementation of the aperture theorem based on equivalence principle," Progress In Electromagnetics Research M, Vol.
It is necessary to account for these implicit assumptions and use them--or similar assumptions--in developing an equivalence principle. One assumption is that ventilation does, in fact, improve IAQ (i.e., that bringing in outdoor air has a net benefit of diluting indoor contaminants rather than a negative effect of bringing in outdoor pollutants).
Testing for the constancy of the fundamental constants has proven to be an efficient test of Einstein equivalence principle that can be performed on astrophysical scales.
For example, Einstein's equivalence principle was commonly mistaken (Cheng 2005), as shown in the British Encyclopedia, to be the same as the 1911 preliminary application of equivalence between acceleration and Newtonian gravity.
Wilkinson, New test of equivalence principle from lunar laser ranging, Phys.
Although physicists since Galileo knew this, Einstein was able to extract from this the Equivalence Principle. This deceptively simple statement (that the laws of physics are indistinguishable locally in an accelerating or a gravitating frame) led Einstein to introduce a new symmetry to physics, general coordinate transformations.
These include: (1) "Playing Marbles with Newton's Gravity"; (2) "The Speed of Gravity?"; (3) "The Equivalence Principle"; (4) "Spacetime Models"; (5) "Frame-Dragging of Local Spacetime"; (6) "The Miniscule Angels"; and (7) "Brief History of Gyroscopes." (YDS)