To accelerate a particle requires force/energy which then “alters time”. E.g., moving massive objects can “alter time” via “frame dragging”
Not sure whether this is better in case society, or in IMHO, but let’s try IMHO.
Since it’s about a hypothetical that’s probably impossible, it doesn’t belong in FQ.
The faster you go the slower you move through time. You are not altering time. You are merely changing the speed you move through it.
Remember, Einstein told us that time is a 4th dimension. Moving through space-time is a trade off. The faster you move through space the slower you move through time and vice-versa.
Indeed, when we talk about it taking 4 years to travel to the nearest star at light speed that is from our perspective on earth. If you were on a space ship that was travelling at near light speed the trip to you on the space ship would seem to take minutes or seconds (assuming we can go that fast which we cannot…not even close but that is an engineering hurdle…in theory it is possible if in practice it is near impossible).
Agree. Somewhat.
But are you at those relativistic speeds, having any effect on the things in your vicinity?
Real or apparent mass? I can’t recall if it is actually an effect on other masses.
It’s a fuzzy one.
Not sure about which time frame it is measured in.
It can take x years relative to the folks on the near light speed ship, but much longer to us back here on Earth.
Depends on who is looking at which clock.
If there is absolute space, then relativity is wrong.
But relativity is right.
Therefore there is no absolute space.
QED
Can you elaborate?
I suppose the question I always ask is “where is 10 minutes ago”. IOW, mathematically speaking, how is the “past” a destination one could travel back to? In fiction, it just sort of “exists”. You get into a machine, press a few buttons, and open the door in 1938 where you can decide whether or not to kill Hitler. So somehow there is a 1938 that is going on while (or when) 2022 is happening and maybe events in 1938 impact those in 2022 (depending on what time travel rules you follow).
I cannot answer for @Exapno_Mapcase but I think what is being alluded to is that there is no absolute motion. There is no rock in space with a sign on it from god that says, “This rock is not moving.” All motion is relative (hence the Theory of Relativity).
Imagine you are alone in space. Just floating there. You see absolutely nothing else in the whole universe. There is only you.
Then, one day, you see me coming towards you. You are just sitting there and I float by at some speed.
Can you say how fast I am going? No, you cannot. You can only say how fast I am moving relative to you. You consider yourself motionless. But, I also consider myself motionless and it is you flaoting past me.
Who is right? Neither of us. Both of us. There is no absolute measure of who is not moving and who is (or some combination of the two). There is no experiment you can do to decide which one is right…because both are right from their own perspective (called a frame of reference).
There’s no factual answer to the question, but ther’s several ways which youmight imagine a time traveller in relativity. Let’s assume that the time traveller has to follow a continous curve in spacetime to get to their destination. There’s 3 different types of curves in spacetime we might imagine the time traveller to follow:
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Past-directed causal curve. This is the H G Wells mode of time travel: our time traveller would see the world around them going in reverse and everybdy else would see them going in reverse. Presumably time goes at the same rate backwards as it dose forwards, so the rate that you see things going backwards depends on your relative speed. You could only travel to places that are in your past, so you couldn’t travel to the Andromeda galaxy ten years in the past as that is not in your past.
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spacelike curve. This is the Flight of the Navigator (Spoiler alert!) mode of time travel: you go faster than light and end up in the past . How time passes for our time travel during the journey is anyone’s guess. Your destination is not limited as, in a connected spacetime, a spacelike curve can be plotted between any two events.
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Future-directed causual curve. This is the Back to the Future mode of time travel, you pop in to a wormhole and pop out the other end in the past. Time passes normally for the time traveller, but the Universe will look pretty weird whilst passing through the wormhole. The time traveller doesn’t have any special properties, instead the wormhole is a feature of the spacetime. Where in the past they can travel to will be constrained by where the other end of the wormhole is.
I see your explanation of course. I often consider only one or two things in the universe situations. It is fun.
But I am not sure about the term, absolute space that Expano Mapcase used.
10 minutes ago is just that. A situation of all things in the universe that is no longer in existence, except if a being with memory observed and remembered it. It exists only in a memory.
I think “absolute space” is meant to be a universe where there is a rock that says:
“This rock is not moving.” ~God
Thus, all motion could be measured in an absolute sense against that one rock.
(I could be completely wrong, just my guess.)
Maybe the point of the big bang could be set as zero?
If there is nothing pre big bang that is in effect in our universe? That might have been moving at the time?
There is no “before” the Big Bang. Time itself began at the Big Bang for our universe. As the late Stephen Hawking put it, asking what came before the Big Bang is like asking what is north of the North Pole. There is just no meaningful answer that would make any sense.
We will never develop time travel. Because if we were to do so any time in the future, we would have heard about it by now.
QED
You may have heard of this. Hard to say if Hawking was happy or disappointed:
I like this stuff. Even a dumbass like me can come up with ideas.
If there are more universes out there, then ours can be somewhere in the timeline of creation. If another universe is far enough away in creation in whatever the hell exists before a universe occupies it, then we may not be able to see it. Yet.
Maybe there are universes colliding somewhere.
If another universe is far enough away from us, that light and gravity from it has not had time enough to reach us, then we do not know it exists. It has no effect on us.
Obviously the lizard overlords are not allowing us to know they have time travel.
Lord Zuckerberg III has algorithms in place to block the posts from the future.
