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Topic: Planck time

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In the News (Thu 24 Apr 14)

  Planck time - Wikipedia, the free encyclopedia
Eponymously termed for Max Planck, it is considered to be the smallest possible interval of time.
The Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to the Planck length, and is thus considered to be a "quantum of time".
Shortest time interval measured - coverage of 2004 event on BBC news.
en.wikipedia.org /wiki/Planck_time   (144 words)

 Planck units - Wikipedia, the free encyclopedia
In physics, Planck units are physical units of measurement defined exclusively in terms of the five fundamental physical constants shown in the table below in such a manner that all of these fundamental constants take on the numerical value of 1 when expressed in terms of these units.
Planck units are only one system of natural units among other systems, but might be considered unique in that these units are not based on properties of any prototype, object, or particle but are based only on properties of free space.
With the exception of the Planck momentum and Planck impedance and the possible exception of the Planck mass, base and derived Planck units are impractical for empirical science, engineering, and everyday use, unless rescaled by many orders of magnitude.
en.wikipedia.org /wiki/Planck_units   (2030 words)

 Time - Wikipedia, the free encyclopedia
Time is also a matter of significant social importance, having economic value ("time is money") as well as personal value, due to an awareness of the limited time in each day and in our lives.
In Existentialism, time is considered fundamental to the question of being, in particular by the philosopher Martin Heidegger.
Time management is the organization of tasks or events by first estimating how much time a task will take to be completed, when it must be completed, and then adjusting events that would interfere with its completion so that completion is reached in the appropriate amount of time.
en.wikipedia.org /wiki/Time   (2164 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, with time being 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.utm.edu /research/iep/t/time.htm   (16277 words)

 Planck time
Planck time, 10^-43 seconds, is the fundamental unit of time which cannot be broken down into smaller, meaningful units.
The number is based on the time it would take a photon travelling at the speed of light to across a distance equal to the Planck length.
Planck time is often used in reference to the period between 0 and 10^-43 after the origin of the universe.
www.iscid.org /encyclopedia/Planck_time   (80 words)

 Quantized space-time
Of course, whether or not space and time are measurable with infinite precision is ultimately irrelevant to the paradoxes and their resolution: what we as humans can know about the world is a different matter from what is or is not true or possible in the world.
Time would seem to be more accurately portrayed as a chronology of events instead of some immeasurable rate which incorrectly implies time has meaning independent of any way to measure it.
Planck time is a unit to measure the duration of motion in a same way as meter is: man invention, with clock we measure duration of motion, with meter we measure the length of motion, this is what Mach and Einsten say about time:
lofi.forum.physorg.com /Quantized-space-time_3996.html   (2547 words)

 Big Bang models back to Planck time
To model the Big Bang cosmology at earlier times than those covered in Weinberg's First Three Minutes, certain time regimes have been proposed with the types of events which would be happening at those times.
This is the first of the spontaneous symmetry breaks which lead to the four observed types of interactions in the present universe.
Before this time the forces other than gravity would be unified in what is called the grand unification.
hyperphysics.phy-astr.gsu.edu /hbase/astro/planck.html   (805 words)

 The Planck Era
Therefore, as we extrapolate back in time to the beginning of the Universe, eventually one would reach a state of sufficient temperature and density that a fully quantum mechanical theory of gravitation would be required.
The corresponding lengths, energies, temperatures, and times are displayed in the adjacent table (the unit GeV stands for 1 billion electron volts of energy).
However, the Planck scale is so incredibly small that this presumably only had meaning in the initial instants of the creation of the Universe.
csep10.phys.utk.edu /astr162/lect/cosmology/planck.html   (313 words)

 Planck Time
The energies needed to smash particles to within a Planck length of each other were available to the universe at a time equal to the Planck length divided by the speed of light.
At the Planck time, the mass density of the universe is thought to approach the Planck density, c
It is presumably only during the Planck era, when the usual four spacetime dimensions acquire their natural Planck scales, that the existence of what is more fundamental than the usual ideas of mass-energy and spacetime becomes fully revealed.
abyss.uoregon.edu /~js/glossary/planck_time.html   (358 words)

 UAH: News
Their findings will create problems for astrophysicists and cosmologists who agree with Albert Einstein's theory that time, gravity and the fabric of space are different manifestations of the same phenomenon, sort of like thunder and light are different signatures of lightning.
Planck length is the distance a beam of light would travel in that time ‹ about 0.000000000000000000000000000000001 (10-33) cm.
Tying together the theory of gravitons with the shortest possible measurements of time, quantum theory says time would move in miniscule, Planck time-sized bits - like grains of sand passing chaotically through an hourglass, or a sequence of jittery freeze frames that on average last one Planck time rather than a continuous, seamless flow.
www.uah.edu /News/newsread.php?newsID=106   (868 words)

 The Planck scale: relativity meets quantum mechanics meets gravity. (from Einstein Light)
According to Special Relativity's time dilation and length contraction, two observers with relative motion are condemned to eternal disagreement about times and lengths.
Anyhow, these lengths and times are very small, but they are results solely of the values that appear naturally in our physical laws.
If these lengths and times are observable as physical lengths and intervals in moving frames, it appears that we shall need to modify Special Relativity to include them.
www.phys.unsw.edu.au /einsteinlight/jw/module6_Planck.htm   (1217 words)

 Metric-60   (Site not responding. Last check: 2007-09-10)
This is achieved because, in the Planck scale (and corresponding metric-60), c (the speed of light in a vacuum), ħ; (Dirac's constant), and G (the gravitational constant), are all defined as equal to one.
The Planck time is the natural unit of time, the smallest possible measurement of time within the boundaries of physics, denoted as t
The Planck Temperature is the temperature one Planck Time unit after the big bang.
jean.nu /view.php/page/CanonUnitsMetric60   (957 words)

 The Cosmological Quantum Units and the Planck Units
The socalled Planck units are not based on a physical theory, and neither are they themselves base for a physical theory.
The intention of Max Planck was – in 1899 – to find a unit of length, a unit of time and a unit of temperature, independent of specific local systems and the existence of man.
The Planck mass is equal to the mass of a uniton, when the Universe had the age equal to Planck time!
www.rostra.dk /louis/quant_12.html   (1045 words)

 SPACE.com -- Hubble Pictures Too Crisp, Challenging Theories of Time and Space
The newest study was led by Roberto Ragazzoni of the Astrophysical Observatory of Arcetri, Italy and the Max Planck Institute for Astronomy in Heidelberg, Germany.
Einstein said time, gravity and the fabric of space are different manifestations of the same phenomenon.
In recent years, theorists have refined all this thinking and determined a pair of quanta -- the Planck length (one trillion-trillion-trillionth of a meter) and a similarly miniscule packet of Planck time -- that should be the smallest measurable.
www.space.com /scienceastronomy/quantum_bits_030402.html   (846 words)

 Chronon & Planck's Time
Planck proposed a set of natural units in 1899 to a meeting of the Prussian Academy and the time unit he proposed was
The unit time is how long light takes to go unit length so it equals unit length divided by c.
Since Planck time is 0.539 E-43 second, if you multiply by E45 you get 53.9 seconds which is on same scale as a ordinary minute.
www.physicsforums.com /showthread.php?threadid=6174   (433 words)

 Planck frequency and Planck time   (Site not responding. Last check: 2007-09-10)
times higher than middle D on the piano, equivalently the D string on a violin or guitar.
Planck units are customarily based on h-bar, the compatible format for frequency being angular rather than cyclic—radians per second rather than cycles per second.
These two multiplied together give a square frequency which, multiplied by h-bar, gives the power of the beam(wattage in effect.) Any power can be divided by h-bar to give the square of a frequency.
www.planck.com /planckomega.htm   (267 words)

 Paradoxes Resolved, Origins Illuminated - Planck limits
That was in the time mathematics was viewed as a part of physics.
In modern times, mathematics took an independent route and the concept of infinite was revived by Cantor.
People need time to change their minds because there are other consequences of our beliefs that take time to examine.
www.metaresearch.org /msgboard/topic.asp?TOPIC_ID=193   (6723 words)

 From what I understand, Planck time is the amount of time it takes a photon to move Planck length, but what is Planck ...
Thus, the Planck length is the typical quantum size of a particle with a mass equal to the Planck mass.
As you point out, the Planck time is then just the Planck length divided by the speed of light.
Since the Planck length has this special property of being the length scale where we can't ignore quantum gravity effects, it is typically taken to be the size of a fundamental string, in string theory.
www.physlink.com /Education/AskExperts/ae635.cfm   (638 words)

 Unified Theory: Freespace constants derived
Planck's work was not about electromagnetic waves travelling in free space, in which euclidean geometry is a good approximation, but on the interaction of such waves with matter.
Matter plays an important role in all Planck's work, and thus, a non-Euclidian space has to be preferred for all Planck units, and so, a circumference value must be used in favour of a radius value as the shortest length, whether or not normalised to unity.
The space time dimensions for a 3D outgoing or incoming travelling volume of energy is the same as that of a 3D standing wave, but the conversion constant for the kg in these two cases is different.
www.blazelabs.com /f-u-const.asp   (3922 words)

 Center for Natural Units
In some areas of basic research the Planck units are used instead of conventional (metric) ones.
These units were proposed in 1899 by Planck as a general-purpose universal set of natural units for science.
Practical-sized versions of the Planck units — power-of-ten multiples of the small ones and power-of-ten fractions of the large — presented as a postmetric system of adapted traditional units.
www.planck.com   (1586 words)

 index.html   (Site not responding. Last check: 2007-09-10)
Even tho time in a dipole is in resonance, as is length, there is a significant difference attributed to this matter of parity as to how to graphically display and to view time dilation as a function of gravity and Relativity.
Time accuracy, on a practical level, is a function of our ability to make measurements of time in the macrocosmic matrix which depends on our ability to produce resolution which is rather poor at the present.
Dipole time resonance odd-parity is not to be confused with the odd-parity of the transverse charge family of AM, no more so than dipole length resonance even-parity is to be confused with the even-parity of the longitudinal mass family of AM.
home.sofast.net /~fitzgerald   (12423 words)

 What is Planck length? What is Planck time?
The Planck length is the scale at which classical ideas about gravity and space-time cease to be valid, and quantum effects dominate.
The Planck time is the time it would take a photon travelling at the speed of light to across a distance equal to the Planck length.
This is the ‘quantum of time’, the smallest measurement of time that has any meaning, and is equal to 10
www.physlink.com /Education/AskExperts/ae281.cfm   (131 words)

 Time and distance scales
The implications for relativity were the biggest concern I had at the time.
The continuum required for relativity is incompatible with the uncertainty that is fundamental to quantum mechanics.
This suggests the Planck time and distance scales are approaching the point at which space and time are discrete or digital.
www.mtnmath.com /whatrh/node63.html   (212 words)

 Planck Era
Our understanding of the Planck era is poor because at this time a theory which encompasses both quantum mechanics and gravity might need to be developed before progress can be made.
This distance is known as the Planck length and the light travel time across this distance is known as the Planck time and is given by
What this means is that our current theory of gravity (GR) breaks down for times (and scales) less than 10**(-43) seconds, the Planck time.
zebu.uoregon.edu /~imamura/209/apr5/planck.html   (547 words)

 Planck units
Since these are specialized units that are only intended to be used under extremely narrow situations (this is clear when you look at the definition of the candela), we can make the sweeping generalization that all applications using these units can in fact use the derived units for energy and power (combined with other units).
For instance, the Planck equivalent of the candela would just be the power unit; the lumen equivalent would be the power unit times the steradian, and the lux equivalent would be the power unit times the steradian divided by the square of the Planck length.
Note that the Planck units are traditionally expressed in terms of hbar, where hbar == h/(2 pi).
www.alcyone.com /max/writing/essays/planck-units.html   (686 words)

 Gravitational Waves - A Possible Planck Time Phenomenon   (Site not responding. Last check: 2007-09-10)
If the lengths, the energies, the times become much larger than the constant, we are in the classical physics regime with likely little hope of recovering quantum signatures.
In the superconductor, quantum gravity events could be accomplished through Planck time tunneling across Josephson junctions, which could infer "ultra high" electron energy fluctuations or tunneling times across the junctions.
High tunneling times are referred to as the Hartman effect, which suggests the existence of superluminal and arbitrary large group velocities across these junctions.
americanantigravity.com /articles/348/1/Gravitational-Waves---A-Possible-Planck-Time...   (310 words)

 [No title]
The changing of one event often has widespread rammifications on the future, often altering the entire future such that the 'present' (the time from which the time traveller left) ends up being nothing like what it was when the traveller returns.
after i took the time to read that long ass book of his, the next week he had some announcement on the television that his whole wormhole theory was not plausable.
i guess the story assumes that when he travels back in time, his memory "stays" in the time that he left, meaning that when he goes back he doesn't recall that he was once the girl.
www.xanga.com /item.aspx?user=kr156&tab=weblogs&uid=288236683   (1604 words)

 Planck mass; time; length derived out of air?
The Planck units are algebraic combinations of three measured constants of nature, the speed of light, c, Planck's constant, h, and Newton's constant of gravity, G. Those constants have been measured many many times.
The concept of h came from problems in thermdynamics/electromagnetism around 1900 which predicted that the fl body radiation spectrum for a cavity (like a heated oven) should have infinite energy.
In order to solve this Max Planck realised you could get the right spectrum if you assumed light was made up a particles which had energy hf, where f was their frequency and h a constant.
www.physicsforums.com /showthread.php?p=914646   (494 words)

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