Multiversal Time Travel Theory

By me(Atul)

Basic Concept for the theory

For the theory to work we first have to believe that universe is infinite

If the universe is infinite, then there must be infinite versions of our universe. This means:There are infinite copies of Earth, of us, of this moment everything

There will be infinite universes 100% identical to ours completely because everything matching perfectly it can be one in septillion and even more

That includes universes where everything matches perfectly same people, same atoms, same history just like ours.

Now the theory is if we time travel we won't travel in time in our universe instead we will travel in time a 100% replica of our universe a same version of our universe. Now it fixes everything

Time Travel Without Paradox

This theory solves the grandfather paradox. Usually, the paradox says:

If you go back in time and kill your grandfather, you wouldn’t be born, so you couldn’t go back to kill him creating a contradiction.But in my theory, when you time travel:

You don’t travel within your own universe.You enter a different version of the universe that is exactly the same up to that point in time. now here's the thing as I said future Is already decided so like when you travel in time the replica you entered can be still in past because but since future is already decided it has the same future as the where you traveled from you can only time travel to those with everything same and the also the decided future is same so if you even go to future there it's the same future as the original one since future is already decided.

Now get back to the paradox

So if you kill your grandfather in that world, only the version of you from that world will never be born. But you came from another universe, so you still exist

That means no paradox.

Timeline Shifts

Once you enter another universe:

The future of that universe starts changing because of you because as soon as you enter that universe the determined future will get changed

The universe you left also the future from that universe changes because you’re no longer there.( This theory supports future being already decided)

From the moment you arrive, the two universes are no longer identical.

That’s why two versions of you can exist:

One that belongs to the new universe (maybe still a child or unborn)

One that came from another world (you)(me)

Wormholes Are the Key

Time travel happens through wormholes, which are like tunnels between space and time. The idea is:

One side of the wormhole is a black hole (entry point)

The other side is a white hole (exit point — still hypothetical, but supported by Einstein’s equations)

The wormhole doesn’t just go through time — it also connects to a different universe. That universe is

The closest possible match to ours

At the exact time we want to travel to

Limits of Time Travel

There are two major limits:

1. We can’t go back further than the moment the wormhole was created.

Example: If the wormhole was made in 1950, we can’t travel to 1800.

2. We can’t go forward beyond the time the wormhole still exists.

If the wormhole collapses in 2070, we can’t travel to 2080.

So our travel range is only between the wormhole’s birth and death.

How the Wormhole Connects

Wormholes link to the nearest matching universe the one with the same atoms, people, and history.because if everything is same then there will be the wormhole in that universe we are using and both same wormholes will get connected

It’s not random, but it's not controllable (yet).

Maybe in the future, scientists can control which universe to connect to but in this theory, it just connects to the closest match by default.

About White Holes

White holes are the opposite of black holes instead of sucking matter in, they push it out. They are not yet found, but the math from Einstein’s theories suggests they exist, just like black holes were only theoretical before being confirmed.

This theory accepts white holes as real to allow the wormhole to work properly.

Math Not Included Yet because I am pretty young so I still haven't reached that level of math to show it. I just gave this theory based on the knowledge I got from videos and articles and created a theory. I don't know how much of the theory make sense and logical that's why I posted it here

So now

Time travel works by moving into another version of the universe, not by changing your own.

No paradox happens because the version of you in that universe isn’t affected.

Wormholes act as bridges between universes and points in time.

As soon as you enter the universe future will change so you can't go to the original one you can only go to the changed future like universe and instead of just wormhole the whole universe has to be same to same in order to travel

And this theory suggests you're not going to future or past you're going to a universe which timeline is either ahead or behind the timeline of our universe so because of that it doesn't effect the flow of time.

Like our universe is in 2025 but you can go to a another universe which haven't reached out timeline but since future is decided you will reach a universe which can be in 1900 but has the same future in 2025 of that universe will be completely same to our 2025 universe. like you can reach a universe which is ahead of us and is in 2300 but since future is decided our 2300 will be same to same to their 2300 and yes you don't know what timeline you're going. And after you go to one since future changes of that universe you're no longer connected to the one you came so you have to somehow travel through space to find your universe

1 hour ago, Atul said:

If the universe is infinite, then there must be infinite versions of our universe. This means: There are infinite copies of Earth, of us, of this moment everything

There will be infinite universes 100% identical to ours completely because everything matching perfectly it can be one in septillion and even more

That includes universes where everything matches perfectly same people, same atoms, same history just like ours.

Do you have a proof of this? Whenever someone mentions something like this, I am reminded of the Burnside problem in mathematics. Normally expressed in terms of group theory, it can be interpreted in terms of a string of characters. The problem itself is quite general, but there is a specific case which remains an open problem:

Suppose one has a string of characters from an alphabet of two characters (a binary number perhaps). Suppose also that no substring of any length repeats five or more times in a row. The question is: Is the string necessarily finite?

An answer of "no" to this open problem invalidates the reasoning you applied in this thread for it would indicate that an infinite string doesn't necessarily contain all possible substrings, such as a substring that repeats five or more times in a row.

I don't know the answer to this problem, but it does provide food for thought regarding the idea that an infinite space necessarily contains all possibilities.

KJW

Thanks for the reply that Burnside problem is a cool angle I hadn’t heard of before.

I get your point that just because something is infinite doesn’t guarantee that every pattern (like an exact replica of our universe) must appear. That’s definitely true in pure math.

But my theory is based more on physics than abstract math. In an infinite universe made of finite particles and combinations, the chances of exact patterns repeating even really rare ones becomes extremely high. That’s the logic behind assuming there could be a universe that’s 100% the same as ours up to a point.

From what I’ve read, physicists like Max Tegmark support this idea too that infinite space basically guarantees near or exact duplicates just based on probability and limited combinations.

So I totally see where you’re coming from, but I still think (in a physics context) it’s more likely that exact versions of us exist somewhere.

So it's not guaranteed but in this case the most likely one is if universe is infinite then there should be infinite version of ourselves

Thanks again I really appreciate your reply

Edited June 26Jun 26 by Atul

4 hours ago, Atul said:

If the universe is infinite, then there must be infinite versions of our universe. This means:There are infinite copies of Earth, of us, of this moment everything

Why?

Just now, dimreepr said:

Why?

Seconded +1

11 minutes ago, Atul said:

There are two major limits:

1. We can’t go back further than the moment the wormhole was created.

Example: If the wormhole was made in 1950, we can’t travel to 1800.

2. We can’t go forward beyond the time the wormhole still exists.

If the wormhole collapses in 2070, we can’t travel to 2080.

So our travel range is only between the wormhole’s birth and death.

How is this

supported by this

12 minutes ago, Atul said:

supported by Einstein’s equations)

?

Surely the way you have described wormholes assumes and absolute time throughout the superuniverse ?

Which is definitely not in accordance with Einstein's equations.

1 hour ago, studiot said:

Seconded +1

How is this

supported by this

?

Surely the way you have described wormholes assumes and absolute time throughout the superuniverse ?

Which is definitely not in accordance with Einstein's equations.

I just did a little more research and

This doesn't go against Einstein’s theory. In fact, it's based on General Relativity. According to physicist Kip Thorne (who used Einstein's equations), time travel through a wormhole can’t take you to a time before the wormhole was created. That’s not a flaw — it's a known rule in real physics

ics.

1 hour ago, dimreepr said:

Why?

If the universe is truly infinite and allows variation, then every possible arrangement of particles including the exact arrangement that forms you, your life, and our universe should eventually repeat. So even if the chance of another exact version of you is incredibly small, in an infinite universe, small probabilities still happen an infinite number of times. That’s why infinite versions of ourselves will exist if universe in infinite it can be one in one septillion doesn't matter still infinite version of everything of our universe will exist

6 hours ago, Atul said:

Now it fixes everything

Hello! I am unable to follow your logic.

Please explain what happens if someone creates a paradox by time travel from some other identical universe and arrives in this universe where we have this conversation. They prevent you from posting the opening post above*. What will happen in this universe according to your idea?

Your idea seems to say the future is “predetermined” but also says your arrival instantly changes that future. Those two statements cannot both be true as far as I can tell.

*) for instance by creating the grand father paradox in this universe

11 minutes ago, Ghideon said:

Hello! I am unable to follow your logic.

Please explain what happens if someone creates a paradox by time travel from some other identical universe and arrives in this universe where we have this conversation. They prevent you from posting the opening post above*. What will happen in this universe according to your idea?

Your idea seems to say the future is “predetermined” but also says your arrival instantly changes that future. Those two statements cannot both be true as far as I can tell.

*) for instance by creating the grand father paradox in this universe

Good question! Let me explain it simply.In my theory, if someone from another universe time travels into this one and tries to create a paradox like stopping me from posting this it wouldn’t "break" the universe or erase anything. Instead, the moment they arrive, this universe’s future would just shift based on their actions.So the future isn’t fixed forever it just follows one path until something changes it, for example like someone new entering our universe from a diff timeline.Also, the person who time-traveled isn’t from this timeline, so they aren’t creating a paradox for themselves. They’re just influencing a new universe that looks like their own, but now takes a different direction from the moment they show up.That’s how the theory avoids paradoxes while still allowing change. Hope that clears it up

8 hours ago, Atul said:

Wormholes Are the Key

Time travel happens through wormholes

Most of the popsci stuff I have read talks about wormholes but the consensus appears to be that they are unstable.

This is a variation of H Everett's Many Worlds Interpretation of Quantum Mechanics, where each decision/observation/interaction 'creates' a new universe that time evolves differently from the previous. Understand that this is an interpretation of the theory; a way to 'make sense' of the counter-intuitive aspects of QM.

This has also been proposed for time travel paradox, where the decision to kill your grandfather splits off a new universe in which you were never born.

The only difference that you are proposing is that infinite numbers of universes are pre-existing, there is no splitting due to decision/observation/interaction, and travel between universes and time is accomplished, rather, by wormholes.
K Thorne also has very specific rules about wormholes and how Closed Time-like Loops are allowed to be used for time travel, within the framework of GR.

Edited June 26Jun 26 by MigL

42 minutes ago, MigL said:

This is a variation of H Everett's Many Worlds Interpretation of Quantum Mechanics, where each decision/observation/interaction 'creates' a new universe that time evolves differently from the previous. Understand that this is an interpretation of the theory; a way to 'make sense' of the counter-intuitive aspects of QM.

This has also been proposed for time travel paradox, where the decision to kill your grandfather splits off a new universe in which you were never born.

The only difference that you are proposing is that infinite numbers of universes are pre-existing, there is no splitting due to decision/observation/interaction, and travel between universes and time is accomplished, rather, by wormholes.
K Thorne also has very specific rules about wormholes and how Closed Time-like Loops are allowed to be used for time travel, within the framework of GR.

Thanks for the reply

You're right that parts of my theory sound similar to the Many-Worlds Interpretation and Kip Thorne’s wormhole ideas. But what I’m proposing is a bit different.

I’m not saying new universes are created by decisions or quantum observations. In my theory, all possible universes are already pre-existing — including ones identical to ours — and time travel happens by entering another universe’s present, which might look like your past or future. So it’s not about branching timelines, it’s about navigating existing ones.

Also, the moment a traveler arrives, that universe's future shifts from that point forward which avoids paradoxes without needing to rewrite the traveler’s own timeline. And yes, I based the wormhole limits (like not traveling before creation) on Kip Thorne’s general relativity model.

I just want to add I actually came up with this theory originally, without knowing about Everett’s or Thorne’s work when I first thought of it. Later, I started reading more and found out that some parts line up with existing ideas. When you talked about it I just did some research and found out afew things are similar But I didn’t build it off their theories I came to it on my own through logic, and then learned it shares some overlap.

I hope it clears things up and people won't think I copied it.

Again thanks for the reply

46 minutes ago, MigL said:

This is a variation of H Everett's Many Worlds Interpretation of Quantum Mechanics, where each decision/observation/interaction 'creates' a new universe that time evolves differently from the previous. Understand that this is an interpretation of the theory; a way to 'make sense' of the counter-intuitive aspects of QM.

This has also been proposed for time travel paradox, where the decision to kill your grandfather splits off a new universe in which you were never born.

The only difference that you are proposing is that infinite numbers of universes are pre-existing, there is no splitting due to decision/observation/interaction, and travel between universes and time is accomplished, rather, by wormholes.
K Thorne also has very specific rules about wormholes and how Closed Time-like Loops are allowed to be used for time travel, within the framework of GR.

Just now, Atul said:

I just did a little more research and

This doesn't go against Einstein’s theory. In fact, it's based on General Relativity. According to physicist Kip Thorne (who used Einstein's equations), time travel through a wormhole can’t take you to a time before the wormhole was created. That’s not a flaw — it's a known rule in real physics

ics.

That may well be so, and indeed MigL has pointed you at KT's work.

But it does not answer the question I actually asked about absolute time.

I added a couple of lines of explanation, what did you not understand about them ?

If the universe is infinite, then there must be infinite versions of our universe. This means:There are infinite copies of Earth, of us, of this moment everything

7 hours ago, dimreepr said:

Why?

https://en.wikipedia.org/wiki/Infinite_group

"In group theory, an area of mathematics, an infinite group is a group whose underlying set contains an infinite number of elements. In other words, it is a group of infinite order. "

6 hours ago, studiot said:

Seconded +1

Please. Don't be silly..

Just now, Sensei said:

Please. Don't be silly..

Did you have a reason for this ?

If so please share it.

Just now, Sensei said:

"In group theory, an area of mathematics, an infinite group is a group whose underlying set contains an infinite number of elements. In other words, it is a group of infinite order. "

Yes this is true but so what ?

It is also a fundamental property / characteristic of any group, finite or infinite, that each and every element of the group is unique.

Certainly not a property the OP has endowed his model with.

Edited June 26Jun 26 by studiot

2 minutes ago, studiot said:

Did you have a reason for this ?

If so please share it.

Dim is not able to express himself in a clear way. In fact, it is not clear whether with his question he is questioning the infinity of the Universe, or whether he is questioning whether an infinite Universe can contain infinite Universes. i.e. you don't know which question he even asked and what he is questioning..

13 minutes ago, studiot said:

It is also a fundamental property / characteristic of any group, finite or infinite, that each and every element of the group is unique.

Whether something is unique depends on the point of view. i.e. frame-of-reference. e.g. you assume something is 0,0,0 in 3d and count the distance from that point.

ps. Please don't take this as an attack on you, because I like you very much.

The statement he quoted was of the form "if (something) then (result)". It seemed pretty clear the "why" was accepting the "if" and questioning the "then".

4 minutes ago, pzkpfw said:

The statement he quoted was of the form "if (something) then (result)". It seemed pretty clear the "why" was accepting the "if" and questioning the "then".

An infinite universe by definition must contain infinitely many universes with all possible versions and infinitely many Earths with all possible versions (they don't even have to be in these other inner universes). Because it's just math (with their infinitesimals ;) )

Edited June 26Jun 26 by Sensei

Just now, Sensei said:

Dim is not able to express himself in a clear way. In fact, it is not clear whether with his question he is questioning the infinity of the Universe, or whether he is questioning whether an infinite Universe can contain infinite Universes. i.e. you don't know which question he even asked and what he is questioning..

But sometimes he is piercingly perceptive and I for one wish to encourage that side of him.

Just now, Sensei said:

Whether something is unique depends on the point of view. i.e. frame-of-reference. e.g. you assume something is 0,0,0 in 3d and count the distance from that point.

ps. Please don't take this as an attack on you, because I like you very much.

No attack, it's just properly conducted discussion.

However if you are using a mathematical group you do not have the luxury of a point of view.

Element uniqueness is part of the definition.

The real number form an infinite group and every one of them is different.

My query, and I believe that of dimreepr, was that the OP has claimed that repetition (or copying) must occur because the universe is infinite..

This is not so.

Perhaps there is confusion between Cantor's definition of an infinite set as one in which each subset can be mapped one-to-one to the entire set, for example the interval (0, 1) contains the same quantity of points as the whole real line but it is in no way the same or a copy.

Edited June 26Jun 26 by studiot

2 minutes ago, studiot said:

However if you are using a mathematical group you do not have the luxury of a point of view.

Element uniqueness is part of the definition.

The real number form an infinite group and every one of them is different.

But now imagine that you are inside one of these groups and looking at others next to you.. everything is relative toward you, and you are in the "center"..

In 3D graphics and the creation of virtual worlds, we have (at least) two methods: the object that is the player is in the center. So, you can transform the whole world (all the vertices i.e. millions or billions etc) that he/she sees (multiplying each 4x1 vector by a 4x4 matrix). Or you can transform in 3D the player itself.. The effect is pretty much the same, except that the number of calculations is millions/billions/trillions etc. of times smaller.. This is precisely the point of view.

ps. 4th component in 3D graphics is not time..

11 minutes ago, studiot said:

Perhaps there is confusion between Cantor's definition of an infinite set as one in which each subset can be mapped one-to-one to the entire set, for example the interval (0, 1) contains the same quantity of points as the whole real line but it is in no way the same or a copy.

If there can be an unlimited number of subgroups then there can also be a group that is an almost perfect copy of another group with only one e.g. bit/atom changed.. Create this an infinite number of times and you have..

Edited June 26Jun 26 by Sensei

Just now, Sensei said:

But now imagine that you are inside one of these groups and looking at others next to you.. everything is relative toward you, and you are in the "center"..

The mathematical term 'group' (originally from the german) is just not appropriate for this purpose.

There are other group axioms which the model does not comply with.

15 hours ago, Sensei said:

Dim is not able to express himself in a clear way. In fact, it is not clear whether with his question he is questioning the infinity of the Universe, or whether he is questioning whether an infinite Universe can contain infinite Universes. i.e. you don't know which question he even asked and what he is questioning..

How poor is your comprehension, that a single word 'does a fly by'?

I even underlined the question, with a question mark.

One issue with the premise is that if Alice can travel to the other universe (even without time travel), they can’t be identical, since now there are two Alices in one, and none in the other. And if the travel is forced to be symmetric with identical entities, has anything actually changed?