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	Arrow of time - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-03)
		This arrow of time seems to be related to all other arrows of time and arguably underlies some of them, with the exception of the weak arrow of time (see below).
		A problem with using causality as an arrow of time is that, as David Hume pointed out, the causal relation per se cannot be perceived; one only perceives sequences of events.
		According to the theory of quantum decoherence, and assuming that the wave function collapse is merely apparent, the quantum arrow of time is a consequence of the thermodynamic arrow of time (also see Entropy (arrow of time)).
	en.wikipedia.org /wiki/Arrow_of_time (1806 words)

	Time [Internet Encyclopedia of Philosophy]
		If physical time, psychological time, and biological time are three different kinds of time, then three answers are required to the question "What is time?" and some commentary is required regarding their relationships, such as whether one is the most fundamental.
		Spacetime is four-dimensional and a continuum, and time is a distinguished, one-dimensional sub-space of this continuum.
		Proper time along a worldline in 4-d spacetime is the time elapsed by an object having that worldline, as shown on an ideal clock having the same worldline.
	www.iep.utm.edu /t/time.htm (17142 words)

	20th WCP: Arrow of Time: Towards a New Epistemology of Science
		Recently, it is claimed that these events can be understood comprehensively by means of a metaphor: the 'arrow of time.' The purpose of the present paper is twofold: (1) to build an epistemological structure that underlies the principle of time's arrow; and (2) to pursue the unity of science in a novel fashion.
		Various arrows cannot be reduced into one grand system; but by recognizing their respective roles and positions in their own system, can one make valid inferences from them and thereby build such a system of knowledge which illuminates them all.
		Arrow of Time, Directin of Time, Asymmetry of Time, Anisotropy of Time, Irreversibility of Time, Unidirectionality of Time, all these terms are used in synonymous way.
	www.bu.edu /wcp/Papers/TKno/TKnoAlte.htm (2973 words)

	The Mystery of Time's Arrow
		Time, as a variable frequently appears in most of the mathematical equations used to describe known physical world.
		Time's Arrow is an important but mysterious property of the world we live in.
		His creative work in building the universe took place over a unique period of time, a time never again to be repeated, during which God created the raw materials of the universe (space, time, energy and matter), and them formed them into a well-ordered low-entropy, self-renewing system.
	www.ldolphin.org /tarrow.html (1695 words)

	time's arrow
		Physicists often use the term "the arrow of time" to denote the asymmetry between past and future directions of time.
		The correct way to picture the arrow of time is by analogy with a compass needle or weather vane, which point in a direction but do not move towards it.
		So, while the second law of thermodynamics requires that the arrow of time point from order to chaos, from disequilibrium to equilibrium, it seemf, that the early Universe started at equilibrium and is now far from equilibrium-all of which seems to point the arrow in the wrong direction.
	www.dhushara.com /book/quantcos/alivtime/time.htm (3030 words)

	Entropy (arrow of time) - Wikipedia, the free encyclopedia
		The thermodynamic arrow is often linked to the cosmological arrow of time, because it is ultimately about the boundary conditions of the early universe.
		It currently seems that the ultimate reason for a preferred time direction is that the universe as a whole was in a highly ordered state at its very early stages, shortly after the big bang, and that any fluctuations in it were uncorrelated.
		In the first scenario, the cosmological arrow of time is the reason for both the thermodynamic arrow of time and the quantum arrow of time.
	en.wikipedia.org /wiki/Entropy_(arrow_of_time) (3501 words)

	Review of Coveney and Highfield, ‘The Arrow of Time’
		The arrow of time is one of the big unclaimed prizes of modern physics.
		For a start, the authors overlook an ambiguity in the arrow metaphor, and hence confuse the issue of the directionality of time (i.e., the question whether the universe is symmetric in time) with the question as to whether time flows.
		The real puzzle is why there is an arrow of time at all; i.e., why the universe is not simply in thermodynamic equilibrium at all times (except during the inevitable local fluctuations).
	www.usyd.edu.au /time/price/preprints/arrow.html (977 words)

	HAS THE ARROW OF TIME MISSED ITS MARK? (Site not responding. Last check: 2007-11-03)
		Time, if we can intuitively grasp such an identity, is a delusion: the difference and inseparability of one moment belonging to its apparent past from another belonging to its apparent present is sufficient to disintegrate it.
		Although the metaphorical "arrow of time" receives marked emphasis in certain areas of modern physics--notably thermodynamics, radiation, and cosmology, it should by no means be taken as evidence that time actually "flies" (or "flows" or "passes" or "moves") in any direction whatsoever.
		Penrose wants to explain the low entropy and the arrow of time by a new physics which is explicitly time-asymmetric and comes with a built-in arrow of time and forces the universe to begin in a highly uniform state.
	home.earthlink.net /~dillonford/arrow_of_time.html (3899 words)

	Time's Arrow & Archimedes' Point: Home Page
		But if we are to avoid the double standard fallacy, we need to consider time symmetrically, and take seriously the possibility that the arrow of time may reverse when the universe recollapses into a "big crunch."
		Time's Arrow and Archimedes' Point presents an innovative and controversial view of time and contemporary physics.
		He is the author of Facts and the Function of Truth (Blackwell, 1988) and a wide range of articles in journals such as The Journal of Philosophy, Mind, and Nature.
	www.usyd.edu.au /time/price/TAAP.html (908 words)

	Competing Universalisms Dot Net: The Arrow of Time
		But speaking of “the arrow of time” is the same as talking about change over time, or perhaps it is better to say it includes change over time, but in one direction only.
		If there were no change over time, then that would be a refutation of the arrow of time, so the arrow of time is real, and change is real, and so we are real.
		It is the arrow of time that dictates everything; this should be clear if you accept that the arrow of time and change over time are the same things.
	competinguniversalisms.net /2005/12/arrow-of-time.html (872 words)

	arrow of time
		The direction, apparently inviolable, of the "flow" of time that distinguishes the past from the future.
		The one exception is the second law of thermodynamics which states that entropy must increase with time.
		One possibility is that the overall arrow of time in the universe is due to its beginning in a state of very low entropy.
	www.daviddarling.info /encyclopedia/A/arrow_of_time.html (158 words)

	Chaos,Entropy and the Arrow of Time
		The nature of time is central not only to our understanding of the world around us, including the physics of how the Universe came into being and how it evolves, but it also affects issues such as the relation between science, culture and human perception.
		This unrelenting march of time is captured in thermodynamics, the science of irreversible processes.
		But when the bead was moved for more than about 2 seconds at a time, the second law took over again and no useful energy could be extracted from the motion of the water molecules, eliminating the possibility of micron-sized perpetual motion machines that run for more than a few seconds.
	members.fortunecity.com /templarseries/entropy.html (3951 words)

	the arrow of time
		As I understand it, the 'arrow of time' is simply a philosophical explanation for why processes happen one way but don't immediately undo themselves.
		My original question was that time "seems" is percieved to move in a certain direction even if Einstein and Newton´s equations do not stipulate this and maintain that in physics, time, as per their theories, can move forward or backward.
		Time is the measure of this motion against other things in motion, including our clocks, or the workings of our brain.
	www.physicsforums.com /showthread.php?p=1096780#post1096780 (743 words)

	Amazon.fr : Time's Arrow: Or the Nature of the Offense: Livres en anglais: Martin Amis (Site not responding. Last check: 2007-11-03)
		Amazon.fr : Time's Arrow: Or the Nature of the Offense: Livres en anglais: Martin Amis
		One identity wakes at the moment of Friendly's death and runs backwards in time, like a movie played in reverse, (e.g., factory smokestacks scrub the air clean,) unaware of the terrible past he approaches.
		Trying to discover "when the world is going to make sense," the confused if patient soul watches as the doctor injures the healed, revives Jews who have been gassed, and grows closer to his estranged wife.
	www.amazon.fr /Times-Arrow-Offense-Martin-Amis/dp/0679735720 (448 words)

	The Arrow of Time
		The arrow of time is something of great simplicity that we experience constantly.
		The arrow of time is a very simple concept: time goes one way and one way only.
		The problem with the statistical explanation for the arrow of time is that it doesn't account for human perception.
	www.horology-stuff.com /time/arrow.html (678 words)

	Causation and the Arrow of Time
		And so we adopt asymmetric metaphors for time: we talk of time having a direction, as flowing from the future, through the present, to the past, closing possibilities that once were open; or perhaps we think of time as a measure of our own movement from the past to the future.
		This is obviously not a time-reversal symmetric law: if we look at a system satisfying the second law of thermodynamics, its entropy will generally be increasing and so the time-reverse of the system will generally have entropy decreasing, contrary to the second law.
		Formulating this principle in a Newtonian world is unproblematic: The principle just says there is an ordering on the time line such that given any point x in space-time, events at x cannot causally affect what happens in the region of space-time whose time coordinate is less than that of x.
	www.georgetown.edu /faculty/ap85/papers/CausationAndArrow.html (1569 words)

	Time: The Arrow of Time
		It's impossible, the greatest of modern philosophers thought, to step away from time sufficiently to try to explain it.
		Lebowitz, the George William Hill professor of mathematics and physics at Rutgers University, took as his topic the arrow of time, or as he put it, "the unidirectional nature" of events we observe.
		Their respective velocities are now the reverse of what they were, and by the sixth panel the runners arrive, all together, back at the starting line.
	www.rps.psu.edu /time/arrow.html (1118 words)

	Time's Arrow
		These are the so-called visionaries, the people who spend a lot of their time planning for where they and society will be years down the road.
		I once came across a great phrase for what we would like to do: "Vaccinated Time Travel"; that is, go back into the past to take part in everything but the plagues, nasty infections and bullet wounds.
		While you are asleep you are dead; and whether you stay dead an hour or a billion years the time to you is the same." The key is in the moment.
	wesclark.com /jw/times_arrow.html (1259 words)

	The Arrow of Time
		If the arrow of time is irreversible, this will never happen.
		Time's Arrow, Time's Cycle: Myth and Metaphor in the Discovery of Geological Time
		A discussion paper on the arrow of time as it is presented by Hawkins, Laflamme and Lyons.
	www.hypography.com /topics/arrowoftime.cfm (553 words)

	Physics News Update Number 402 - Story THE ARROW OF TIME (Site not responding. Last check: 2007-11-03)
		Time reversal (T) is one of those symmetries, along with charge conjugation (or C, the operation which turns particles into antiparticles) and parity (or P, the reversal of a particle's coordinates from x,y,z to -x,-y,-z) that were once thought to be preserved in interactions at the atomic level.
		And since the triple symmetry of CPT is still thought to be valid, T by itself was thought to be vulnerable.
		That is, it is now thought that physics does differentiate between the forward or backward movement of time.
	www.aip.org /enews/physnews/1998/split/pnu402-2.htm (154 words)

	UCB Libraries \| Earth Sciences \| The Arrow of Time (Site not responding. Last check: 2007-11-03)
		The Arrow of Time depicts the geologic time table scaled to the length of the plaza.
		From the building's south entrance, one walks backward through time -- starting at the Present at the east end and ending 570 million years ago at the Pre-Cambrian/Cambrian boundary at the west end.
		The Arrow of Time is dedicated to George Anderman, an oil geologist, entrepreneur, and patron of the arts.
	ucblibraries.colorado.edu /earthsciences/arrow.htm (245 words)

	Time’s Arrow from The Hardball Times
		Time's Arrow is a thought-provoknig book that describes the life of its protagonist in an original way: starting at the end and progressing backwards until reaching the beginning.
		You might think that looking at the 2005 season with the arrow of time pointing the other way is an idle exercise.
		Normal time is on the left again and backwards time is on the right.
	www.hardballtimes.com /main/printarticle/times-arrow (2639 words)

	Amazon.com: Arrow of Time: Books: Roger Highfield (Site not responding. Last check: 2007-11-03)
		Not to be confused with Richard Morris's Time's Arrows (LJ 3/15/85) and Stephen Jay Gould's Time's Arrows, Time's Cycles (LJ 3/15/87), this is the first American edition of a book originally published in Great Britain.
		At the center of their theory is an intriguing interpretation of the second law of thermodynamics, which describes the forces of entropy.
		In the acknowledgements we're told that the authors are seeking to bring the latest thinking on the arrow of time to a general audience and I would have to say they've generally succeeded in doing so.
	www.amazon.com /Arrow-Time-Roger-Highfield/dp/0449907236 (1353 words)

	Time's Arrow - Memory Alpha
		Data says no because his brother's positronic brain has a Type L phase discriminating amplifier while his is a Type R. He estimates that the head has been in the cavern for approximately 500 years.
		He further asserts that at some future date, he will be transported back in time to Earth where he will die when he states, "It has occurred.
		When he says yes, she replies, "Don't be so sure." She adds that he must go on this away mission or they will never meet.
	memory-alpha.org /en/wiki/Time's_Arrow,_Part_I (2878 words)

	The Arrow of Time
		In nature, equilibrium is not normal but, to quote Prigogine "a rare and precarious state." Non-equilibrium is the rule.
		For a long time turbulence was regarded as a synonym for disorder or chaos.
		But now, it has been discovered that what appears to be merely chaotic disorder on the macroscopic (large-scale) level, is, in fact, highly organised on the microscopic (small-scale) level.
	www.marxist.com /science/arrowoftime.html (3039 words)

	Amazon.co.uk: Time's Arrow or the Nature of the Offence: Books: Martin Amis (Site not responding. Last check: 2007-11-03)
		Amis cannot even maintain the conceit (about time going backwards and the implications of this) properly.
		In 'Time's Arrow', Amis' Booker Prize winning novel, he tells the story of a German participant in the Holocaust and his later life as an exile in America.
		Crucially, the action occurs in reverse, with the central character (a doctor who executed Jews in the gas chambers) jolting back to life and becoming progressively younger.
	www.amazon.co.uk /Times-Arrow-Nature-Offence-Martin/dp/0099455358 (801 words)

	The arrow of time (Site not responding. Last check: 2007-11-03)
		space at a time after the dot is drawn.
		Lorentz group which reverses time is {-1,1,1,1} along the diagonal, zeroes
		For events expressed as quaternions, time has an arrow on the
	world.std.com /~sweetser/quaternions/spr/timearrow.html (271 words)

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