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	Equivalence principle - Wikipedia, the free encyclopedia
		The origins of the equivalence principle begin with Galileo demonstrating in the late 16th century that all objects are accelerated towards the center of the Earth at the same rate.
		Under the equivalence principle, this mystery is solved by virtue of gravity being an acceleration from inertial motion caused by the mechanical resistance of the Earth's surface.
		The strong equivalence principle suggests that gravity is entirely geometrical by nature (that is, the metric alone determines the effect of gravity) and does not have any extra fields associated with it.
	en.wikipedia.org /wiki/Equivalence_principle (3202 words)

	equivalence principle concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-21)
		Generalizes the principle of relativity by showing that all observers, regardless of their state of motion, can claim to be at rest, so long as they acknowledge the presence of a suitable gravitational field.
		For example, a person in an elevator in space accelerating upward at 32 feet per second per second would feel the floor pushing upward against her feet in exactly the same way as if the elevator were at rest on earth, where gravity pulls downward with an acceleration of 32 feet per second per second.
		The "weak equivalence principle," which is not as strong as the equivalence principle, states that all objects, independent of their mass or composition, fall with the same acceleration in the presence of gravity.
	www.site.uottawa.ca:4321 /astronomy/equivalenceprinciple.html (294 words)

	Incompatibility between Einstein's General Relativity and the Principle of Equivalence
		It is shown that the simple application of that principle to photons moving in the Sun's gravitational potential leads to an equation which is not compatible with the one predicting the deflection of light by the Sun.
		This principle is considered to be one of the foundations[1] of general relativity.
		According to the principle of equivalence, equation 17 is valid either when the photon is attracted by the gravitational field or when the Sun is accelerated and the particle travels in straight line (without any gravitational field).
	www.newtonphysics.on.ca /Equivalence/Equivalence.html (2073 words)

	Einstein's Equivalence Principle
		Little g is also equivalent to the inertial "g" forces of acceleration experienced in sudden starts, stops, and sharp turns (Einstein's "Principle of Equivalence" of gravitational and accelerated reference frames).
		C) (Einstein-Noether) Symmetric - The equivalence of free and bound energy: E = hv (Planck); E = mcc (Einstein); hv = mcc (DeBroglie); - The conservation of the symmetry of free energy: the symmetry as well as the raw energy of light must be conserved (Noether).
		The enlarged framework of the extended equivalence principle allows gravity to join the other forces as a symmetry/entropy debt of free energy (by Noether's theorem, all charges of matter are the symmetry debts of light).
	people.cornell.edu /pages/jag8/equival.html (1999 words)

	Equivalence Principle (Site not responding. Last check: 2007-10-21)
		The Equivalence Principle is the fundamental basis for the theory of general relativity.
		The Weak (or Newtonian) Equivalence Principle is the principle that the laws of mechanics are the same in inertial and freefalling frames of reference.
		The Strong (or Einstein) Equivalence Principle is the principle that all physical laws, not just those of mechanics, are the same in all inertial and freely falling frames of reference.
	www.astro.virginia.edu /~jh8h/glossary/equivalence.htm (97 words)

	principle - Wiktionary
		Cathartine is the bitter, purgative principle of senna.
		Principle (moral rule) is often confused with principal (most important.) Consult both definitions if in doubt.
		The confused may care to remember that 'The principal alphabetic principle places A before E' as a reminder of the relative spelling.
	en.wiktionary.org /wiki/Principle (185 words)

	The principle of equivalence
		These two versions of the principle of equivalence [ POE 1, POE 2 ] can be vividly clarified by considering the famous ``gedänken'' experiments of Einstein called the lift experiments .
		This is the principle of equivalence between gravity and acceleration, and is a corner stone of the theory of General Relativity.
		We shall later use the strong equivalence principle , which says that one can discover how all the laws of physics behave in a gravitational field by postulating that their laws in a freely falling inertial frame are identical to their laws in Special Relativity i.e.
	vishnu.mth.uct.ac.za /omei/gr/chap5/node5.html (844 words)

	gravityhist2
		This is usually interpreted as implying that the two quantities are equivalent measures for a single physical property, the quantity of mass of an object; hence, the term Equivalence Principle.
		A direct consequence of assuming the Equivalence Principle is true, is that all bodies fall with the same acceleration under the influence of gravity.
		The Strong or Einstein Equivalence Principle states that all of the laws of physics (not just the laws of gravity) are the same in all small regions of space, regardless of their relative motion or acceleration.
	einstein.stanford.edu /STEP/information/data/gravityhist2.html (1680 words)

	More on Equivalence Principle
		Although the equivalence principle helped to guide the development of general relativity, it actually is in that theory a consequence instead of being a foundation principle.
		However, the equivalence principle continues to be cited to this day because it is an excellent pedagogical tool, helping people to bridge the conceptual gap between Newtonian mechanics and the geometrical world of general relativity.
		Although only the weak equivalence principle is valid, it should be noted that being in an accelerated frame of reference is enough to explain the downward acceleration of massive objects and the bending of light due to gravitation, as well as gravitational time dilation.
	www.artilifes.com /equivalence-principle.htm (1032 words)

	Weak EQuivalence Principle
		The equivalence principle can be stated as "At every spacetime point in an arbitrary gravitational field, it is possible to chose a locally inertial coordinate system such that, within a sufficiently small region of the point in question, the laws of nature take the same form as in unaccelerated Cartesian coordinate systems.
		The Strong Principle of Equivalence states all the laws of nature are the same in a uniform static gravitational field and the equivalent accelerated reference frame.
		That is the Weak Equivalence Principle is a restatement of the equality of gravitational and inertial mass.
	aether.lbl.gov /www/science/equiv.html (629 words)

	The Pound-Rebka Experiment: Just Which Equivalence Principle Do You Believe In?
		The only explanation of this effect that is compatible with the Equivalence Principle is that this clock slowing at sea level is a relativistic time dilation caused by the earth’s escape velocity at the clock’s location.
		If experimental evidence could ever be found to invalidate the principle of gravitational expansion, it the would also serve as a falsification of the Equivalence Principle, because the principle of gravitational expansion, in effect, demands that the Equivalence Princile be both absolute and unnecessary.
		The Equivalence Principle is always added as a metaphysical precondition to the experiment in order to invalidate any measurements that are not pleasing to the human intuition.
	www.circlon-theory.com /HTML/poundRebka.html (1824 words)

	In Defense of the Principle of Equivalence (Site not responding. Last check: 2007-10-21)
		In fact, it is precisely this at-best asymptotically realizable condition posed by the equivalence principle that gave rise to the view of the universe as a patchwork of locally, causally uniform Minkowski frames as originally suggersted by general relativity.
		Synge states that the equivalence of acceleration due to gravity (experienced when one is fighting the gravitational field), and that of artificial or induced acceleration is incorrect since the field presumably exists even in the absence of a test particle.
		In this way, a non-uniform gravitational field can be replaced by an equivalent, non-uniform acceleration, and we can apply the principle of equivalence even to extended objects (this is what Einstein did when introducing the dynamic, or parameterized, metric in general relativity), though there is neither a theoretical nor a practical reason for doing so.
	renshaw.teleinc.com /papers/princip/princip.stm (569 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		The Satellite Test of the Equivalence Principle (STEP) is a joint European-U.S. space program to investigate one of the most fundamental principles in physics, the Equivalence of inertia and passive gravitational mass.
		A direct consequence of this Equivalence Principle is the 'universality of free fall' such that all objects fall with exactly the same acceleration in the same gravity field.
		The Equivalence Principle was reinterpreted by Albert Einstein as a consequence of an even broader equivalence between the laws of physics in different accelerated reference frames, a principle which Einstein made the basis for his general theory of relativity.
	einstein.stanford.edu /STEP/information/data/general.html (294 words)

	The Principle of Equivalence (Site not responding. Last check: 2007-10-21)
		One of the most important of these is the Principle of Equivalence, which can be used to derive important results without having to solve the full equations of General Relativity.
		An equivalent formulation of the Principle of Equivalence is that at any local (that is, sufficiently small) region in spacetime it is possible to formulate the equations governing physical laws such that the effect of gravitation can be neglected.
		For example, by considering the Principle of Equivalence applied to light travelling across a freely falling elevator, it is possible to conclude that light will follow a curved path in a gravitational field.
	csep10.phys.utk.edu /astr162/lect/cosmology/equivalence.html (244 words)

	2.1 The Einstein equivalence principle
		We now regard the principle of equivalence as the foundation, not of Newtonian gravity or of GR, but of the broader idea that spacetime is curved.
		One elementary equivalence principle is the kind Newton had in mind when he stated that the property of a body called ``mass'' is proportional to the ``weight'', and is known as the weak equivalence principle (WEP).
		The Einstein equivalence principle is the heart and soul of gravitational theory, for it is possible to argue convincingly that if EEP is valid, then gravitation must be a ``curved spacetime'' phenomenon, in other words, the effects of gravity must be equivalent to the effects of living in a curved spacetime.
	relativity.livingreviews.org /Articles/lrr-2001-4/node3.html (2414 words)

	The Principle of Equivalence
		The principle of equivalence being a postulate, the reasons for which Einstein did not take into account the motion of his own frame were not explained.
		We must conclude again that Einstein's equivalence principle is erroneous which means that the behavior of light is perceived differently by observers subjected to gravitational acceleration and inertial acceleration.
		The principle of equivalence implies the equivalence between the inertially accelerated elevator (figure 10.3A) and the gravitationally accelerated photon on figure 10.3B.
	www.newtonphysics.on.ca /EINSTEIN/Chapter10.html (3088 words)

	The Light Cone: The Principle of Equivalence
		Einstein was looking to extend his Principle of Relativity to more general siutations.
		The Equivalence Principle: Free Fall in a Gravitational Field
		This led Einstein to predict that light is bent by the gravitational field around the Sun.
	www.phy.syr.edu /courses/modules/LIGHTCONE/equivalence.html (293 words)

	Einstein Equivalence Principle
		In agreement with Einstein Equivalence Principle there is not as distinguishing this gravitational field of a possible acceleration of the compartment.
		If the conclusion is true, Einstein Equivalence Principle is wrong; if the conclusion is false, the classic electromagnetism is wrong.
		If you clarify your thought experiment you should be able to convince yourself this situation is consistent with the Equivalence Principle. See for instance D'Inverno, Introducing Einstein's Relativity, for help (you can try to solve some problems and compare with the answers in the back).
	www.ecientificocultural.com /einstein_equivalence_principle.html (1480 words)

	Equivalence Principle, Redshift, and Curvature (Site not responding. Last check: 2007-10-21)
		The following argument might help one's intuition regarding the close relationship between the Principle of Equivalence, gravitational redshift, and the necessity for describing gravitation through the curvature of spacetime.
		The Principle of Equivalence says the gravitational field of the Earth is equivalent to a frame accelerated at g, so over a time t one builds up a velocity v=gt.
		However, this redshift in frequency is equivalent to a change of time intervals, i.e.
	supernova.lbl.gov /~evlinder/umass/eqpr.html (277 words)

	equivalence principle
		The complete equality of gravitational and inertial mass, gravity and acceleration, and the identification of freefalling frames with inertial frames.
		The equivalence principle is the fundamental basis for the general theory of relativity.
		The weak (or Newtonian)equivalence principle is the principle that the laws of mechanics are the same in inertial frames of reference.
	www.daviddarling.info /encyclopedia/E/equivalence_principle.html (164 words)

	NOVA \| Einstein's Big Idea \| Relativity (Lightman Essay) \| PBS
		The key idea of general relativity, called the equivalence principle, is that gravity pulling in one direction is completely equivalent to an acceleration in the opposite direction.
		If gravity is equivalent to acceleration, and if motion affects measurements of time and space (as shown in special relativity), then it follows that gravity does so as well.
		Unlike many previous scientific breakthroughs, such as the principle of natural selection, or the discovery of the physical existence of atoms, general relativity had little foundation upon the theories or experiments of the time.
	www.pbs.org /wgbh/nova/einstein/relativity (1248 words)

	CiteULike: What are the Hidden Quantum Processes In Einstein's Weak Principle of Equivalence? (Site not responding. Last check: 2007-10-21)
		We provide a quantum derivation of Einstein's Weak Equivalence Principle (WEP) of general relativity using a new quantum gravity theory proposed by the authors called Electro-Magnetic Quantum Gravity or EMQG (ref. 1).
		Newtonian Inertia is a property of matter due to the strictly local electrical force interactions contributed by each of the (electrically charged) elementary particles of the mass with the surrounding (electrically charged) virtual particles (virtual masseons) of the quantum vacuum.
		We propose that Einstein's general relativistic Weak Equivalence Principle (WEP) originates from common 'lower level' quantum vacuum processes occurring in both inertial mass and gravitational mass, in accordance with the principles of quantum field theory.
	www.citeulike.org /article/70709 (445 words)

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