Faster than light - Factbites

Faster than light - Factbites
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Topic: Faster than light

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	Faster-than-light - Wikipedia, the free encyclopedia
		In special relativity, while it is impossible to accelerate an object to the speed of light, or for a massive object to move at the speed of light, it is not impossible for an object to exist which always moves faster than light.
		It is also possible for two objects to move faster than light relative to each other, but only from the point of view of an observer in a third frame of reference, who naively adds velocities according to Galilean relativity.
		Light itself will travel at a speed slower than c when not in a vacuum (causing refraction), and in certain materials other particles can travel faster than that speed (but still slower than c), leading to Cherenkov radiation.
	en.wikipedia.org /wiki/Faster-than-light (3150 words)

	Faster Than Light
		On page 59, Nick lists 14 "things" that go faster than light--including comet tails and the subjective velocity of a space traveller in a near-lightspeed ship--but none of these apparently superluminal "things" can be used to send signals so they are immune from the COP rule.
		At Warp 6, travel time to the nearest star (4 light-years distant) is about a week.
		FTL reveals the fundamental postulate that lies behind the Einstein speed limit--the so-called Causal Ordering Principle (COP) that requires all causal processes (such as signals) to have the same time direction for all observers.
	www2.cruzio.com /~quanta/ftl.html (472 words)

	Faster Than Light
		However, it is meaningless to say that the universe is expanding faster than light because the rate of the expansion is measured by Hubble's constant alone which does not even have the units of speed.
		Information is better but tricky to define and sending information faster than light is really just FTL communication not FTL travel.
		Tachyons are hypothetical particles which travel faster than light locally.
	math.ucr.edu /home/baez/physics/Relativity/SpeedOfLight/FTL.html (5278 words)

	Light That Travels Faster Than Light!!
		You can approach the speed of light, but even to the observer who is approaching the speed of light will see light traveling the speed of light faster than him.
		While the group velocity of the signal must travel at a velocity less than the speed of light, it would be perfectly acceptable for phase velocity of the signal to travel faster.
		In WAY overly simplistic terms: in much the same way you're allowed to drive faster in Montana than Illinois, light, some physicists say, moves at different rates in different parts of the universe.
	digg.com /science/Light_That_Travels_Faster_Than_Light_ (2422 words)

	Quantum Non-locality
		At first, it might seem that since the photon tunnels faster than light she would see the light before a signal traveling at the theoretical speed limit could have reached her, in violation of the Einsteinian view of causality.
		Astonishingly, no, because there is no way to use the correlations between particles to send a signal faster than light.
		Photons are the elementary particles from which all light is made; a typical light bulb emits more than 100 billion such particles in one billionth of a second.
	www.dhushara.com /book/quantcos/qnonloc/qnonloc.htm (15072 words)

	ScienceDaily: Light That Travels ... Faster Than Light!
		They were able not only to slow light down by a factor of three from its well -- established speed c of 300 million meters per second in a vacuum, but they've also accomplished the considerable feat of speeding it up -- making light go faster than the speed of light.
		Using their Stimulated Brillouin Scattering (SBS) method, the group was able to slow a light signal down by a factor of 3.6, creating a sort of temporary "optical memory." They were also able to create extreme conditions in which the light signal travelled faster than 300 million meters a second.
		Light -- Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context, electromagnetic radiation of any...
	www.sciencedaily.com /releases/2005/08/050821225731.htm (1294 words)

	Faster-than-light - Wikipedia, the free encyclopedia
		It is also possible for two objects to move faster than light relative to each other, but only from the point of view of an observer in a third frame of reference, who naively adds velocities according to galilean relativity.
		In special relativity, while it is impossible to accelerate an object to the speed of light, or for a massive object to move at the speed of light, it is not impossible for an object to exist which always moves faster than light.
		The expansion of the universe causes distant galaxies to recede from us faster than the speed of light, if comoving distance and cosmological time are used to calculate the speeds of these galaxies.
	en.wikipedia.org /wiki/Faster-than-light (1294 words)

	Faster than light
		But since in the anomalous region the group velocity is faster than the phase velocity, it is no longer equal to the speed of information transfer.
		In the NEC experiment, a light pulse was passed through a cell filled with a gas of caesium atoms, in which a region of "anomalous dispersion" was created using laser beams.
		The experiment exploited the fact that a pulse of light of finite duration is necessarily the sum of an infinite number of waves of different frequencies.
	plus.maths.org /issue12/news/fasterThanLight (850 words)

	Light Can Travel Faster Than Light
		So, rather than saying as Einstein did that nothing can be faster than the speed of light in a vacuum (abbreviated as c), physicists now prefer a more precise version: information cannot travel faster than c.
		In other words, any information encoded in the crest is not travelling faster than light -- and the (modified) version of relativity still holds water.
		According to this Economist's column about relativity, researchers from Duke University in North Carolina have moved parts of light waves faster than the speed of light.
	radio.weblogs.com /0105910/2003/05/23.html (350 words)

	Halfbakery: Faster Than Light
		The reason the leading edge of the pulse appears to move faster than the speed of light is that the cesium vapor chamber counteracts the wave cancellation artifact, revealing the real leading edge of the pulse.
		The way they set up it up caused a pulse to be generated on the output of their apparatus that was similar to the one generated at the input and the timing of the pulses gave the appearance that a pulse moved faster than the speed of light.
		If the answer is YES, then I would probably have to conclude that the spacehip probably has a problem going faster than the ordinary value of lightspeed.
	www.halfbakery.com /idea/Faster_20Than_20Light (7908 words)

	Guest Comment
		Wang's "anomalous refractive index" had the effect of increasing the light pulse's "group-velocity" to a speed faster than light.
		Because nothing with mass can go faster than light (meaning you or me in a rocket ship &; or, for that matter, a baseball or a blurb of electronic information).
		It wasn't much faster than light normally is, but the result was definite.
	www.nationalreview.com /comment/comment072100b.html (454 words)

	Faster than light
		Yet physicists have known for many years that it is possible to devise light pulses that are effectively transmitted over short distances (a few wavelengths) faster than the speed of light in a vacuum.
		Science-fiction authors wanting to get their characters rapidly around a Universe too big to cross in a million lifetimes often invoke the 'tachyon', a particle that travels faster than light.
		If an object were to travel faster than c, it would move backwards in time, violating the principle of causality which says that cause must always precede effect.
	www.nature.com /nsu_new/000601/000601-5.html (640 words)

	Faster than Light Starflight
		This always goes slower than the speed of light, in that there's no way of communicating the needed "code key" in a faster than light way, but on the other hand, if you had faster than light communication, and you had this kind of quantum teleportation available, you'd have faster than light travel as well.
		Tachyons are particles that always travel faster than the speed of light.
		Benford: I became fascinated by this because of the theories which purported to give field solutions for faster than light particles, tachyons, so that, after the reported discovery of tachyons, in 1972, I began to mull over what would happen to the world, and the whole scientific enterprise, if tachyons proved to exist.
	www.sff.net /people/Geoffrey.Landis/FTL.htp (3312 words)

	altvw105
		Does this result mean that using this effect, a signal could be transmitted faster than the speed of light?
		Physicists L. Wang, A. Kuzmich, and A. Dogarliu of the NEC Research Institute in Princeton, NJ, had a paper about to be published in the prestigious journal Nature describing an experiment in which not only had laser pulses traveled faster than light, but had actually emerged from the apparatus before they had entered it.
		In vacuum, all frequencies of light have a phase velocity of c, but in a transparent “dispersive” medium like glass or water, a given wave typically move slower than c with a speed that depends on its frequency.
	www.npl.washington.edu /AV/altvw105.html (1991 words)

	Space Age: Faster than light?
		There is nowhere on the diagram to place the world-line of anybody travelling "faster than light" relative to yourself: all such lines are spacelike lines, not timelike ones.
		This is because in Relativity physics the phrase "faster than light" has no more meaning than the phrase "slower than stopped".
		Actually, according to the equations of Relativity no physical body can go at 400,000 km/sec, since this is greater than the speed of light (300,000 km/sec).
	www.astronist.demon.co.uk /space-age/sa82.html (971 words)

	New Scientist Breaking News - Speed of light broken with basic lab kit
		Electric signals can be transmitted at least four times faster than the speed of light using only basic equipment that would be found in virtually any college science department.
		While the peak moves faster than light speed, the total energy of the pulse does not.
		Scientists have sent light signals at faster-than-light speeds over the distances of a few metres for the last two decades - but only with the aid of complicated, expensive equipment.
	www.newscientist.com /article.ns?id=dn2796 (460 words)

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		Creader OBD II The Creader is a stand alone unit for reading and clearing codes from your OBD II port (and turning the check engine light off).
		A computer is not required to interface with your vehicle.
	www.digimoto.com (460 words)

	Faster-than-light engine
		A faster-than-light engine is a currently unobtainable level of technology that allows an object with significant mass to travel faster than the speed of light (186,000 miles per second), a rate of travel many times beyond what we are capable of.
		In the world of fiction, faster than light drives are used to allow a more exciting narrative, since less time is spent on centuries-long journeys between stars.
		The light barrier is not a limit imposed upon us by our technological limits.
	www.worldhistory.com /wiki/F/Faster-than-light-engine.htm (460 words)

	Literature on Faster-than-light tunneling experiments
		This violation of causality is very worrysome, and thus special relativity's demand that neither matter nor information should move faster than light is a pretty fundamental one, not at all comparable to the objections some physicists had about faster-than-sound travel in the first half of this century.
		The first problem with this naive conclusion is that, while in special relativity neither information nor energy are allowed to be transmitted faster than light, but that certain velocities in connection with the phenomena of wave transmission may well excede light speed.
		In recent years, some physicists have conducted experiments in which faster-than-light (FTL) speeds were measured.
	www.aei-potsdam.mpg.de /~mpoessel/Physik/FTL/tunnelingftl.html (1483 words)

	Faster than Light Travel
		The first possible method for going faster than light that will be covered is simply accelerating a ship up to the speed of light.
		The concepts of relativity and negative energy will be introduced at the beginning because it is necessary to have a basic understanding of these concepts to understand some of the ways to go faster than light and some of the problems that would complicate that effort.
		Next, wormholes will be discussed as a possible way to travel faster than light.
	www.cec.mtu.edu /csa/courses/presentations/merlo.htm (304 words)

	Great Moments in Science - Faster than Light - Part 1
		He said that nothing can travel faster than the speed of light.
		Great Moments in Science - Faster than Light - Part 1
		Faster Than Light Part 2 : Part 3 : Part 4
	www.abc.net.au /science/k2/moments/gmis9805.htm (780 words)

	BBC News SCI/TECH Faster than a speeding light wave
		On a simple level, a flashing row of lights can display signals that move from one end of the row to the other end faster than c if the lights flash on and off in time.
		Physicists have been making light pulses that travel faster than c (the speed of light in a vacuum) for years.
		It is a fundamental law of physics, a fact that is built into the architecture of the Universe and taught to every student, that nothing can travel faster than light which is roughly 300,000 km a second (186,000 miles).
	news.bbc.co.uk /hi/english/sci/tech/newsid_781000/781199.stm (571 words)

	Hyperdrive - getting from A to B faster than light
		Of course, when it comes to travelling at speeds faster than light, it always helps to have an engine powered by fusion generators that boost the ship into hyperspace - another realm which makes faster-than-light travel a real possibility - at least in Star Wars.
		I also believe faster than light travel will be ac...
		If you where to travel faster than light, wouldn't...
	www.exn.ca /starwars/hyperdrive.cfm (1280 words)

	WorldChanging: Another World Is Here: Light Faster Than Light
		The intersection point can move faster than the speed of light, but physics isn't violated because the blades themselves are moving much more slowly.
		Information is not actually moving faster than light, just the point that the information appears to come from.
		It will appear to move faster than the previously determined 'c'.
	www.worldchanging.com /archives/003331.html (883 words)

	The Ya'N Engine
		There were many theoretical possibilities for going faster than light, but all of them required either technology beyond human capabilities, or energy requirements that were equally unattainable.
		Standard ion propulsion pushed the ship to a safe distance from Tsevorda (no one wanted the tonnage of Ya'Nennis present on the ship to explode or create huge gravitic shifts in Tsevorda orbit if there were a mishap of some kind), and then the unmanned vessel was remotely sent into faster than light motion.
		No object with mass could travel faster than light, for the faster an object moved, the greater the energy needed to move it.
	www.srv.net /~dollan/yan.html (883 words)

	Faster Than Light: Superluminal Loopholes in Physics
		Faster Than the Speed of Light: The Story of a Scientific Speculation, Price:
		One of the most general consequences of Einstein's special relativity from 1905 is that no physical signal (or a piece of matter) can ever move faster than light.
		The author gets high marks for realizing that an acceleration of 1g for 1 year will yield light speed and for analyzing every possible means to break the light speed barrier for both space travel and communications.
	www.totalhits.com /amazon/asinsearch_0452263174.html (883 words)

	Space Travel
		Traveling faster than the speed of light in the Shards Universe is a dicey proposition.
		Rather than bumble through it myself, I'll let Professor Paul Magill, who helped lead the FTL project, explain it.
		And although pentrinsic code is needed to activate the drive, and it only works within two light years of the target star, its overwhelming advantages over fusion engines has led to the greatest boom in ship building since the Martian Iron Rush.
	www.shardsuniverse.net /space_travel.htm (883 words)

	How to travel faster then light
		This may sound prety cool in itself but having a zero mass allows you to do some things you might not normally be able to do - like travel faster than the speed of light.
		The power of your engines will only determine how fast you get to light speed not if you will, there is no maximum speed and the accelleration limit will be decided by the power of your engines.
		It may take you a long time to reach light speed but you will evntually get there and then exceed it.
	www.blachford.info /quantum/fastlight.html (883 words)

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