It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
The electromagnetic wave travels at speed of light which is explained by Maxwell's equations. ... As the quanta of these waves, photons will also travel at light speed. In special relativity, the energy of a particle is related to its mass via E=γmc2. Photons are massless, but they have finite energy.
A photon is massless, has no electric charge, and is a stable particle. A photon has two possible polarization states. In the momentum representation of the photon, which is preferred in quantum field theory, a photon is described by its wave vector, which determines its wavelength λ and its direction of propagation.
The photon – the quantum of light or other electromagnetic radiation – is normally considered to have zero mass. But some theories allow photons to have a small rest mass and one consequence of that would be that photons could then decay into lighter elementary particles. So if such a decay were possible, what are the limits on the lifetime of a photon? That is the question asked by a physicist in Germany, who has calculated the lower limit for the lifetime of the photon to be three years in the photon’s frame of reference. This translates to about one billion billion (1018) years in our frame of reference.
Article at physicsworld.com
Negative mass moving backwards in relative time and thus not classically observable.
I'm not a grammar nazi, so I was trying to make sense out of what you said aside from the grammar etc. There are things we can't measure very well, but if we can't measure them we can't claim to know very much about them, at least not in any scientific sense. So shunning measurement is in some sense shunning science, and exploring paths of things which can't be measured is going down a non-scientific road.
originally posted by: Havick007
Apologies to the community, my above reply was appalling in terms of grammar, writing and general English skills
I even see some physicists saying this, but no doubt they are completely wrong which can easily be proven by examples which show the theory of relativity falls apart if that assumption is made, of which they do not seem to be aware. It makes no sense at all to say such a thing, because a photon does NOT HAVE a perspective according to the theory of relativity, which the physicists who work more closely with relativity thus are more familiar with it know very well:
originally posted by: glend
From a photon's perspective, its trajectory occurs instantaneously.
You cannot go at the speed of light so the question is hypothetical. Hypothetical questions do not have definitive answers. Only massless particles such as photons can go at the speed of light. As a massive object approaches the speed of light the amount of energy needed to accelerate it further increases so that an infinite amount would be needed to reach the speed of light.
Sometimes people persist: What would the world look like in the reference frame of a photon? What does a photon experience? Does space contract to two dimensions at the speed of light? Does time stop for a photon?. . . It is really not possible to make sense of such questions and any attempt to do so is bound to lead to paradoxes. There are no inertial reference frames in which the photon is at rest so it is hopeless to try to imagine what it would be like in one. Photons do not have experiences. There is no sense in saying that time stops when you go at the speed of light. This is not a failing of the theory of relativity. There are no inconsistencies revealed by these questions. They just don't make sense.
The concept of wormholes causes us to think of the concept of "distance" in different ways, but it's not such an esoteric concept that we can't think of simple analogies.
originally posted by: Havick007
Why bother with all this fuss about wormholes then.
I haven't looked it up yet but I'm about to, yet even now saying that a photons travels from point A to B instantaneously no matter the distance seems incorrect.
Not necessarily. For you, your reference frame seems stationary, and it's the other clock in the other frame moving with respect to you that is going slower than your clock. But the person in that frame can think they are stationary, and they see your clock moving more slowly than theirs. In relativity, both are correct, as explained starting at 3 minutes in this video:
originally posted by: glend
a reply to: Arbitrageur
I left school at 15 so you need be extra patient with my nonsense...
My understanding is that as we approach c, time slows down,
absolutely, positively not, and if you're still saying that, you don't understand at all the source I cited in my previous post, please re-read it (or read it). You can find some physicists who don't know relativity very well say things like that, and they are wrong. The physicists who know relativity know it's wrong.
so doesn't relatitivty dictate that when light travels from point A to B, its instataneous, from lights perspective.
One over-simplified way to look at it is that we are always going the same speed in 4 dimensional space time. So, it's not a speed limit, it's a constant speed, though nobody knows why it's a constant speed.
Which to my mind suggests that the velocity of c is not really a universe imposed speed limit, its a limit to the reference of time, imposed on the observer.
Which explains why whatever speed the observer is travelling, they will still see light, travelling at the velocity of c. Its not the speed of light that alters, but the obervers reference to time, that changes.
So why does the universe impose this speed/time restriction on the observer. Simply because if it didn't, we couldn't exist. Varying the speed of light would change the strength of molecular bonds and the density of matter itself.
There's some truth to that, for example when Einstein published his theory of relativity which did away with the need for luminiferous aether, most scientists were stuck in the paradigm of believing there had to be an aether so Einstein must be wrong.
originally posted by: Havick007
a reply to: Arbitrageur
The problem people can have with a great education (not so much a problem but an issue to consider) is becoming trapped in a paradigm.
It has happened all to often throughout history. Just when people think they have it all worked out, something changes their perspective or thinking to create a new view, explaination or way of thinking.
Here's a pretty good short youtube clip that can shed some light on that. It talks about muons which are like unstable heavy electrons, and how different distances and different times are perceived by an observer on earth versus what is observed theoretically from the muon's perspective, so if you can watch this a few times and wrap your head around it, you should have a better understanding though it takes years of study to really understand relativity, it did for me and I'm not even an expert on it but I think I understand the concepts in this video pretty well at least:
Time slows down and distance shortens for the photon or something travelling at high speed. Time I understand. Length contraction if that is the correct term seems stranger than dilation. So time has to catch up for the slower observer in a way. For the object at 99% C it's has already traversed the known universe but for the slower reference frame, we observe a delay and have to catch up.. sounds like something I was trying to say in another reply. So, we observe something travel from point to another in a set amount of time and distance. Yet that same object (from it's frame of reference) has already past us by the time we observe it. I need to do more research on that. It's not something I was familiar with.
Why is there a discrepancy in distance and it does seem then that a measurement can change. For the object at high speed the universe would appear minut in size, regarding distance.
This video is about how terrestrial muons are part of our experimental proof of time dilation, length contraction, and special relativity in general.
People seemed a little surprised when sugar pills seemed to make people feel better than the control group in placebo experiments, but this is why studying people and their perceptions gets so complicated, because people are complicated. So unless you want to specifically study some aspect of human behavior or perception, it's better to find less subjective instruments to make the measurements. For example we have a saying that "a watched pot never boils" which is a popular admission that human perception of time is unreliable (as are many other human perceptions).
originally posted by: glend
a reply to: Havick007
I tried that trick, wow, felt big difference which I wasn't expecting.
People seemed a little surprised when sugar pills seemed to make people feel better than the control group in placebo experiments
Wormholes have huge theoretical problems so there may not be any such thing as a stable wormhole that can be traveled through, though people are always working on the theory, but for now, wormhole travel is considered a fringe concept.
What do you think happens and how do you think it can be explained? Have you found any scientific verification of the explanation or is it another placebo type thing where you only feel something different because that's what you expect? If the latter, it's more of an issue of brain function and biology/psychology than having anything to do with the laws of motion. If the former, please post a link to the scientific research you think explains it.
originally posted by: Havick007
Did you try it though. It's subtle but surprising. Completely explainable(obviously) and non mysterious.
The theory of relativity is constantly being tested and re-tested, but it has passed every test so far, and it says something else. It says person A and person B can be in motion with respect to each other, and each can think they are the ones at rest and that the other is the one in motion, and the reason both can be correct is because the same 4 dimensional mathematics in general relativity can describe the overall situation and Lorentz transformations allow us to change from one perspective to the other.
The universe is motion. A truly resting mass on earth or in the universe has not yet been discovered. On earth a table may appear to be resting but it's not. I'm sure you understand that. We are traveling at constant velocity that is balanced in terms of a parrelel and thus don't feel the velocity. We observe and can calculate but feel stationary.
I know this is nothing new and quite basic but what occurred to me is that many people don't even conceptualise it or some that even aren't aware. So to say one is resting and not in motion is always false.
So you want me to elaborate on the theoretical problems with wormholes? It's because of those that even speculating on wormholes is difficult when "there are very strong indications that wormholes that a human could travel through are forbidden by the laws of physics" as explained here by a wormhole expert, Kip Thorne.
originally posted by: Havick007
If one were in proximity to a wormhole. Perpendicular to it along the curve of spacetime. Stars from the linear y plane would appear superimposed on the X. If that makes sense, looking at the wormhole image you uploaded. I've seen similar before. Say you on the left of the wormhole. It's not visible from that perspective but the lensing effects would create distortion and stars would appear to be one one place but actually no where near where they are visible.
The first problem is size. Primordial wormholes are predicted to exist on microscopic levels, about 10–33 centimeters. However, as the universe expands, it is possible that some may have been stretched to larger sizes.
Another problem comes from stability. The predicted Einstein-Rosen wormholes would be useless for travel because they collapse quickly.
"You would need some very exotic type of matter in order to stabilize a wormhole," said Hsu, "and it's not clear whether such matter exists in the universe."
But more recent research found that a wormhole containing "exotic" matter could stay open and unchanging for longer periods of time.
Exotic matter, which should not be confused with dark matter or antimatter, contains negative energy density and a large negative pressure. Such matter has only been seen in the behavior of certain vacuum states as part of quantum field theory.
If a wormhole contained sufficient exotic matter, whether naturally occurring or artificially added, it could theoretically be used as a method of sending information or travelers through space. Unfortunately, human journeys through the space tunnels may be challenging.
"The jury is not in, so we just don't know," physicist Kip Thorne, one of the world's leading authorities on relativity, black holes and wormholes, told Space.com. "But there are very strong indications that wormholes that a human could travel through are forbidden by the laws of physics. That's sad, that's unfortunate, but that's the direction in which things are pointing."
That doesn't require a wormhole, it can happen with massive objects which bend light around them, for example, an "Einstein Cross" has been observed in telescopes as multiple images of the same star or galaxy.
Something else that occured, what if the same point of origin for a source of light be visible from here in 2 two or more places simultaneously. Due to lensing, wave curvature etc.
originally posted by: Arbitrageur
Impossible Muons
This video is about how terrestrial muons are part of our experimental proof of time dilation, length contraction, and special relativity in general.
originally posted by: Havick007
a reply to: Arbitrageur
Time slows down and distance shortens for the photon or something travelling at high speed. Time I understand. Length contraction if that is the correct term seems stranger than dilation. So time has to catch up for the slower observer in a way.