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Originally posted by hadeka
Is there any scientific proof for it ??
Originally posted by Spiderj
I know assuming is bad, but wouldn't time travel and dimensional travel require two completely different technologies and equations?
The two in my opinion are not related
First, a red laser pointer is needed. The red color of the laser pointer is important. The red light, unlike the white light of a flashlight, which is a composite of many colors, doesnt fray as white light does. The red light, specifically, of the laser pointer casts more specific shadows which is what this experiment does.
You will now need a large, dark room. The room should be large enough to set up the laser pointer on, say, a table, and have it cast its light on a wall about one and a half meters, or about five feet away. It is recommended that the room be totally dark to ensure success. The experiment is best done with two people, with one handling the laser pointer and the other observing the pattern on the wall. The positions can then be switched.
Using a pin (and only a pin, not a tack, the holes have to be as small as possible) punch two holes, as close to each other as you can. Then, aiming the laser pointer at the two small holes, a shadow of five slits should be cast on the wall. That is, theres going to be one large red dot cast on the wall. In the dot, there should be five distinct shadows cast by the two holes. If this doesnt work, the most common problem I found was that there wasnt enough distance between the paper and the wall. If possible, increase the distance. It is recommended to have about five meters, or fifteen feet, but, usually about five feet, or a meter and a half, is enough to observe the pattern.
Why, you may be wondering, are there five slits of shadows when there are only two holes? That's because light, as you may have guessed, usually travels in straight lines. We cant, for instance, see around corners or buildings. When light, however, is forced to go through a small hole, it acts like a thirteen year old forced to go clothes shopping with their parents, it rebels. Specifically, it bends. The smaller the hole is, the more it bends. So, if light traveled in straight lines, there would only be two shadows cast by the holes. Instead, however, the shadow of the five slits, from the two holes, is a result of concentric rings of varying thickness and brightness. There is a bright spot in the center, surrounded by a dark ring and, following this pattern, fainter rings of light and darkness around it. The result is the pattern of the five slits.
Patiently, youve read this far and want to know when youre going to detect a parallel universe. This is the next step. Next to the two holes youve punched, make two more. Its important that they be parallel with the other holes and that they be as close to the other two. Also, keep in mind that the width of the point of the laser is narrow (at least mine was) and that the laser has to go through all four holes simultaneously. What should happen, or is expected to happen, is that the same pattern as with the two holes appears. Light beams, according to Fabric of Reality, normally pass through each other unaffected. So, the same pattern as the two holes, should be repeated, only brighter and slightly blurred.
What happens is nothing like that and is, David Deutsch believes, evidence of parallel universes. Only three shadows are cast. That is, two of the shadows disappear. If you look closely, youll see that where there been two red shadows are now dark. So, punching two more holes actually results in two of the shadows going dark.
How does this happen? Something, obviously, is blocking the light from casting the shadow. Or, you might think that the photons, individual units of light, have somehow been bent and recombined to form a pattern of new shadows. The answer, as will be explained, cant be this but is an usually undetectable world of photons, or, a parallel universe.
First, however, it should be explained that what interferes with the laser light has the properties of light. If, for instance, two of the holes are covered by anything opaque, the five slit shadow reappears, but it, the red laser light, can penetrate anything and behaves as light does, that allows light to pass. If, for instance, a system of mirrors is set-up, which the light bounces off of and eventually reaches the wall, the same patterns appear.
What happens when the red laser light is slowed to one photon at a time (no, this cant be done in your dining room)? That is, when only one photon is fired through each of the four slits, the same pattern appears. Could it be that, when the photon passes through the slits, they change course and recombine? Nope. When detectors are placed at each of the four slits, and one photon again is passed through them, only one of the detectors goes off, meaning that the photon hasnt split.
David Deutsch, using an experimentally confirmed prediction from quantum theory, believes that whats causing the interference are shadow photons. More specifically, interference, as in this experiment, is not only common for photons but for every particle. So, Deutsch writes in Fabric of Reality, this is what is causing the interference,
[W]hen a photon passes through one of four slits, some shadow photons pass through the other three slits. The shadow photons, then, are blocking the tangible photons, causing only three shadow slits.
These shadow photons form a parallel universe. David Deutsch writes that they behave as tangible particles do. They obey the law of physics but with the difference that theyre in a different position.
But how, exactly, do the shadow photons stop the tangible ones? The answer that Deutsch presents is that the shadow atoms, present in the shadow photons, form a barrier. Only a small proportion of the tangible and shadow atoms, however, are interacting with one another. Or, as Deutsch writes, each shadow atom in the barrier can be interacting with only a small proportion of the other shadow atoms in its vicinity, and the ones it does interact with form a barrier much like a tangible one. And so on. All matter, and all physical processes, have this structure. To clarify his last point, the parallel universe interacts with the tangible universe in much the same way as particles so in the tangible universe: only a small proportion do. The result is through interference, or weakly, as in the experiment.
Why, you may be wondering, if theres a detectable parallel universes around us, why dont we detect, or notice it, more often? David Deutsch writes, the answer, ...can be found in the quantum-mechanical laws that govern them.
Every particle, for instance, has counterparts in other universes and is only interfered with only by those counterparts. Any other universe, therefore, can only be detected when the particle in, say, our universe converges with its counterpart in another universe. The path of the particle and its counterpart have to be exactly right. They have to separate and join together again, as in this experiment, and the timing has to be right. If theres a delay in the particles or any interference, the particles wont converge. Also, a parallel universe is only detectable between universes that are very alike. In short, because these events are extremely rare, so is the detection of parallel universes is difficult.
It should be added that most physicists disagree with Deutschs conclusion that what is detected in this experiment is another universe. For brevitys sake, the argument against can be summarized as, there is something interfering with the light in this experiment, why does it have to be a parallel universe? Why cant it be just be left to something that we dont yet understand?
If youre interested in how Deutsch answers his critics, I recommend the Fabric of Reality for his answers and reasoning.
Originally posted by hadeka
I would like to ask an important question to me please.
What is the theory of parallel universes ??
Is there any scientific proof for it ??
If it is right, how can it be used for time travel ?