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Oct 10, Recommended for you. New property of light discovered 2 hours ago. Jun 27, Experiment reverses the direction of heat flow Jun 27, User comments.

What is quality of light?

May 08, This should not be on phys. I come here for news. Report Block. I hate to be the first to comment, since its gonna be pretty negative. Science for the masses - I'm all for it - as long as its well done. The video is longer than the text for some odd reason , and contains more groaners. Mass is rest mass or for systems of objects, intrinsic mass , this is a change in terminology rather than the Physics.

The benefit of this approach is that mass is speed invariant, a property of an object regardless of its apparent motion. Cain makes a mess concerning time and distance. What does it mean to "experience" distance? Obviously, nothing - its anthropomorphization gone wild. He claims that a photon becomes part of an atom in the Sun as if it continues to exist. It doesn't. From the point of view of someone travelling at c the entire universe is 2 dimensional. Subejtively no time passes between launch and arrival. Distance is speed times time - and anything times zero is zero.

This is especially freaky in the case of a photon travelling towards a destination that it might never reach as seen by an outside observer e. There's couple related freaky things about photons: 1 A photon has no past light cone. That means nothing can affect a photon en route which I take to be a beautiful way to show that photons that meet must superpose rather than interact. It makes sense to me that the carrier of causality should by neceesity itself be acausal.

Its the Energy 'contained' in a photon which takes tens or hundreds of thousands of years to move from the Sun's Core to its Corona, not the photons. Assigning a single identity to a series of photons is an error in thinking. While its true that if you could accelerate at 1 g for 21 years of your time , you could theoretically travel 1 billion light-years relative to Earth , but this is impossible based on known physics.

The amount of energy required for acceleration would be cosmologically enormous, impact with a single particle of dust would vaporize you among other problems plus you would be traveling at Photons reach zero distance? This is another mash-up.

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It doesn't MEAN anything to be in the rest frame of a photon. Photons DO travel distances relative to us , there is no way to measure anything relative to them. Could all things--even massive, slow-moving particles--be made of particles which do move at the speed of light maybe for just short distances repeatedly? It would seem that that would leave no time or space at the particle level. To experience time, you need to have an inherent, regularly proceeding system and something that acts like a memory to verify that so much change has occurred in the inherent system.

For example, a clock oscillating, and then, something keeping score of how many times it oscillates. Traditional "science" does not recognize any internal structure to the photon. But, Maxwell's definition of light is a pair of mutually enhancing magnetic and electrostatic fields, the electrostatic field giving rise to the magnetic field, the magnetic field giving rise to the electrostatic field, the electrostatic field giving rise to the magnetic field that gives rise to the electrostatic field.

It seems photons so have oscillating internal structures , another demonstration that "relativity" is a fraud. Quite possibly The Stupidest article ever posted here. This comment has been removed by a moderator. I am a layman and I'm not going to repeat what has already been posted, I agree that this article is less than useless Just imagine that ' Either this might end up as a BH or such a mass would spread throughout May 09, I love relativity! It's almost as fun as quantum mechanics. The one thing the guy said that is absolutely correct is that relativity can be a mind bender.

The famous physicist John Wheeler once said, there is only one electron in the Universe and argued that it was the mass component of the photon, and at the speed of light, it would be everywhere at once. He was just speculating for fun about the idea, but that was a great conversation. Photons are Bose particles with integer spin so they are allowed to occupy the same space of zero distance , so there are infinite number of photons all occupying a universe of zero time, zero space, and zero mass, but oddly non-zero energy or information.

When I think of an infinity of photons linked to electrons orbiting a nucleus and quantum mechanics, where an electron jumps up or falls in energy. Time is a numerical order of photon motion in a timeless space. What happens to the light when it passes through a medium that is not vacuum? Maybe so, but it did generate an interesting discussion thus it does have some value.

Photons don't experience time?!? Worse yet, and perhaps the height of irony, photons are also blind!

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Blind as a bat, I swear. May 10, A silly piece of so called science.

Does Light Experience Time?

Pointless and pretentious, how people earn a living dreaming up what amounts to utter tripe is beyond me. Criminal waste of time money and education. May 11, Since we have artificially been able to slow photons down a significant amount, have we created subjectively the oldest light in the universe? May 12, Since we have artificially been able to slow photons down a significant amount, Slowing light down or "stopping" it happens via absorption-reemission events. It does have a direction.

And photons are products of other processes. There are not inifinitely many of them. I'm curious about your responses article below. What does time and space mean? Time and space are inseparable. Time is required for space to exist just as space is required for a place or a thing to exist. Therefore, everything that exists within time and space is real to man. This is the truth about time and space to man.

In ancient days in-depth discussions about life and everything that exists took place in time and space and in a place that could be visited. Spoken human words in ancient days and even to this day are made up of sound-waves of human breath in time and space. Human breath is made up of nitrogen, oxygen, water vapour and many constituents, the nature of all of which is atoms, sub-atomic particles and energy, which are basically light.

Just as lightning in the sky, which the human eye can see, transforms into thunder, light in the human breath, which the human eye Whydening Gyre. Next thing ya know - all that absorption an re-emission have slowed light energy to a point of coalescing into - MATTER! Not rocket science. Sorry, but this is total BS. BTW, I have previously proposed a 1 g. The time dilation usually referred to in special relativity actually has to do with the rate of reception of information as an observer approaches the speed of light when traveling toward the outgoing beam.

As the observer approaches the beam, the rate of the information reception would increase as the approaching observer's velocity increases: "time speeds up". If an observer's velocity could increase beyond c, then the rate of reception of the information content would decrease with increasing velocity: "time slows down".

Light cone

Time would not actually speed up or slow down -- only the rate of information reception. Also the Wheeler-DeWitt Eqation, where time drops out altogether, could refer to time actually being a metric that describes the relative positions of particles due to charge interactions resulting in rotations initially at the sub-quantal level. The Now would be viewed as the "current state of the universe", with Past being a record of previous states and the Future being a projection based on initial states. Einstein's original postulation of 'spacetime' could actually be his recognition that time is created by these motions in space, with further elaborations by others eventually taking president, i.

Minkowski's Block Universe, etc. NOTE: Space limitations prevented this point in my first comment: With the observer traveling at c, it would result in "time standing still" no new information reception. I guess that is one for the philosophers. The word 'exist' already presupposes time and space. Deriving from that an interdependence of space and time is tautological. I apologize for the multiple posts, due to space limitations.


The light cone is constructed as follows. Taking as event p a flash of light light pulse at time t 0 , all events that can be reached by this pulse from p form the future light cone of p , while those events that can send a light pulse to p form the past light cone of p. Given an event E , the light cone classifies all events in spacetime into 5 distinct categories:. The above classifications hold true in any frame of reference; that is, an event judged to be in the light cone by one observer, will also be judged to be in the same light cone by all other observers, no matter their frame of reference.

This is why the concept is so powerful. The above refers to an event occurring at a specific location and at a specific time.

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To say that one event cannot affect another means that light cannot get from the location of one to the other in a given amount of time. Light from each event will ultimately make it to the former location of the other, but after those events have occurred.

As time progresses, the future light cone of a given event will eventually grow to encompass more and more locations in other words, the 3D sphere that represents the cross-section of the 4D light cone at a particular moment in time becomes larger at later times. However, if we imagine running time backwards from a given event, the event's past light cone would likewise encompass more and more locations at earlier and earlier times. The farther locations will be at later times: for example, if we are considering the past light cone of an event which takes place on Earth today, a star 10, light years away would only be inside the past light cone at times 10, years or more in the past.

The past light cone of an event on present-day Earth, at its very edges, includes very distant objects every object in the observable universe , but only as they looked long ago, when the Universe was young. Two events at different locations, at the same time according to a specific frame of reference , are always outside each other's past and future light cones; light cannot travel instantaneously.

Other observers might see the events happening at different times and at different locations, but one way or another, the two events will likewise be seen to be outside each other's cones. Commonly a Minkowski diagram is used to illustrate this property of Lorentz transformations. Elsewhere, an integral part of light cones is the region of spacetime outside the light cone at a given event a point in spacetime. Events that are elsewhere from each other are mutually unobservable, and cannot be causally connected.

Space-space tilt is measured by angles , and calculated with trig functions. Space-time tilt is measured by rapidity , and calculated with hyperbolic functions. In flat spacetime, the future light cone of an event is the boundary of its causal future and its past light cone is the boundary of its causal past.

In a curved spacetime, assuming spacetime is globally hyperbolic , it is still true that the future light cone of an event includes the boundary of its causal future and similarly for the past. However gravitational lensing can cause part of the light cone to fold in on itself, in such a way that part of the cone is strictly inside the causal future or past , and not on the boundary.

Light cones also cannot all be tilted so that they are 'parallel'; this reflects the fact that the spacetime is curved and is essentially different from Minkowski space. In vacuum regions those points of spacetime free of matter , this inability to tilt all the light cones so that they are all parallel is reflected in the non-vanishing of the Weyl tensor. From Wikipedia, the free encyclopedia.

Principle of relativity Galilean relativity Galilean transformation Special relativity Doubly special relativity. Lorentz transformation.