Boltzmannbrain

The majority of humans seem to be trying to maximize pleasure and minimize pain, and not just for themselves, but for everyone.

I should have said proper time instead of "experienced" in my question. But you answered it anyway.

I meant a different proper time in general. But I don't think that makes sense since I think that would mean that absolute time exists.

Ok, that's what I thought, but I found it difficult to find a good source to explain this the way that we are talking about it. I wonder now if it even makes sense to ask if my proper time runs slower. How would that even make sense since time is relative? But anyway, maybe that's a philosophical question; I don't know.

Last time I asked this I got a mouth full, but I have to ask again because I really don't know. Are you saying that some things experience less time than others? I have read many times that time passes the same for everything in special relativity, but I am not totally sure about general relativity.

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That's right. There is no dilation of either twin for themselves. Are you saying, of course it does experience less time? Are you saying that a fast moving muon experiences less time than a muon at rest?

Yes, there shouldn't be anything confusing about that. I made a mistake. But it can get confusing in other situations.

So if you can't understand what I am saying, then I must be a troll. Great attitude, god luck learning anything new. Sorry, I meant that the time dilation does not happen for the people on Earth even though it appears that way from the ship. The Earth (not the traveler) experiences a long 10 years. In other words, nobody experiences time dilation; it is only an observation from a different POV.

Please ignore this post. I made a mistake. I need more coffee! If you only experience 1 week in the ship, then shouldn't your clock/calendar show 1 week? Going by your clock, in your 1 week you are still leaving Earth. You need to experience a long painful 10 years to get back to Earth.

No, there are an infinite number of twins in every moment in time, or every "slice in the block".

This is also widely misunderstood. The muon experiences the same amount of time as the observer. The muon *does not* experience different time than the observer, even though I see that term written everywhere. If you look at it in a spacetime diagram, the muon cheats; it takes a different angle through spacetime. It takes a "shortcut" even though we were always taught that the fastest way to get from point A to point B is a straight line. It turns out the fastest way to get from point A to point B is to go really fast. No, that is wrong. This is a perfect example of why I brought this up with martillo.

Time dilation only happens to a POV. It does not happen for the object being viewed. This is widely understood; it is not controversial at all, at least for mainstream physics.

No, it definitely does not happen to the astronaut or anything. Time flows at the same rate for everyone/everything. Yes, that also happens. But when they are tugging on each others beard, the other twin is still travelling to the meeting point. Again, I am not saying time dilation is wrong or doesn't exist. It's just a way of looking at exactly what it is. When people hear common phrases like, "one twin ages 10 years while the other twin only ages one week" that can be taken the wrong way. It could mean that the twin in the ship only experienced one week. I am trying to explain to martillo this ambiguity, especially because I believe that is how he or she has been thinking about time dilation.

It happens, but it doesn't happen to anything. It is only perceived by an outside observer. I agree. But the twins are now in different points in time even though they see each other as aged differently. I agree. I wasn't trying to say that time dilation is wrong. From what I read in martillo's post, I believe that he or she is taking the semantics too strictly, thus causing doubt in time dilation altogether. So I tried to explain time dilation in this way.

I will try to explain as best I can. First we will start with time dilation; it is much easier than explaining the perception of length contraction. For any object, time runs the same, 1 second per second. That I don't think is too controversial or misunderstood. So time dilation is only perceived; it doesn't actually happen to anything. Yes the twin will have a bigger beard when when they meet. But remember, the twin with the longer beard is actually still perceiving his/her own time in the past (with a short beard) at 1 second per second. So the younger twin is only meeting his/her sibling in the future. No time dilation actually occurs for the object that is perceived to have dilated time. Second, length contraction, this is much harder to explain, so here is a spacetime diagram. Imagine Bob is in a ship flying by Alice really fast at the point p. Imagine that the origin is brought to point p (I did not put it all at the origin because it crammed everything together too much). Alice sees the ship contracted from point p to g, say 3 meters. Bob is in the ship, and it has its normal length from his point of view, say 10 meters. Assume all points p, s and g synchronize their clocks. At the point that they sync their clocks, you might notice that Alice sees point g of the ship, while Bob sees point s of the ship. s and g are the same 2 points on the ship, but they are seen at different angles in spacetime. There is no length contraction; it is also a matter of perception.

You are right. There is no actual time dilation or length contraction for anything. They are only perceptions/observations. This might cause a stir here, but it's true.

Yes, that is true. By "accelerations" do you mean gravity? Are you saying that you don't think time dilation exists from either velocity or acceleration?

Good idea! Maybe this is the answer.

I thought he was indirectly saying that the wave from the electron is slower. But then of course the question is how that EM wave got slower. I have no idea. I will try to find out though.

You don't even need the math to know it slows down. Just look at how the waves' amplitudes add and cancel each other out. Start at 7:06.

If you add both waves all throughout, you will see that the new wave's troughs and crests move slower. It is just the outcome from adding the amplitudes of both waves. Good question. I am not sure how that works. The only thing I can think of is that the wave he is referring to is the disturbance of the electric field that the electron makes as it accelerates in space. In that case it would only travel as fast as the electron travels, speaking in classical terms. But I really have no idea.

Go to 7:10 in the video. You simply add the amplitudes of the waves. For example, you see when the crests and a troughs align; you get 0 amplitude, or just a flat line, and so on. So it is just what happens when slow and fast waves combine mathematically.

What do you mean? The photons are the light.

I don't know a lot about all this, but I know that electrons also absorb light, which I believe is "holding it up". Yeah, that's how I understand it.