The 3 Schools of Time Travel Theories, Part 3: Multiverse

Estimated reading time: 4 minutes

A week ago we started this series about time travel theories and the paradoxes that arise from each, with an introduction and a “quick” look at what paradoxes are, why and how they exist. Then, on Monday, we discussed the Dynamic Timeline theory and its biggest paradox, the Grandfather Paradox. Next came the second time travel theory, the Fixed Timeline, which solves the Grandfather Paradox but causes a new paradox, the Causal Loop.

For our last post of the series today, we’re looking at the last theory, what many consider a “paradox killer”: The Multiverse.


The Multiverse Theory suggests that time travel into the past is possible, and you can change the past… but not really. What it does is combine both the Dynamic and Fixed timeline theories into a timetravel theory where you can change the past without breaking space and time. Here’s how:

Whenever you travel back in time, change something, and then return, you do not return to your own universe and your own timeline. Instead you find yourself in a copy of the universe in which the Fixed Timeline theory applies to your situation.

Let’s look at an example. Here we go with killing Hitler again.

You’re a guy building a time machine. Hating Hitler is basically a requirement to becoming a time traveler so as soon as you complete your machine you get in there and head into the past with a handgun and a bullet with Hitler’s name on it.

So you find Hitler, and pull the trigger. BAM! Hitler’s de–pause.

You are now in an alternate universe, a universe in which Hitler was killed by a time traveler (Fixed Timeline). Maybe this alternate universe already existed, or maybe it was created by your meddling around with history. Either way, you’re in an alternate universe.

resume–ad. Mission accomplished. But you don’t notice anything. You get back into your time machine and head to your own present. Obviously things are different (Dynamic Timeline) and as far as you’re concerned (from your own point of view) you’ve changed the past, but this is not really your universe. In your universe Hitler was never killed by a time traveler. The people you left behind still live with Hitler in their past. The only thing that happened in your universe is a time traveler got into a time machine and never came back.

Now you’re living in a universe where Hitler was killed by a time traveler, but you didn’t cause a paradox because the Fixed Timeline theory protects you from it.


This theory’s prerequisite is that you believe in the Multiverse, an infinite number of alternate universes that cater for all possible scenarios and choices people make every day. This is why most people are resistant to this time travel theory because it requires an additional, entirely unproven theory.

But if you can wrap your head around the possibility of infinite universes it will quickly become clear why this theory is considered the “paradox killer”.

Killing your own grandfather is no problem because it’s not your own grandfather you’re killing, but the grandfather in the timeline where he was killed by a time traveler (that looks a lot like him).

And you can‘t cause a causal loop because the past of the timeline you came from (in which the inventor actually did design the original blueprints) is not the same inventor of the past from the timeline you travel to (in which the inventor got the blueprints from you).

Because you have both Dynamic and Fixed timeline concepts rolled into one, it’s rather hard to come up with a paradox to disprove our understanding. But still, this theory is not without its own share of problems. Specifically…


In our Hitler story, Dude A travels into the past of Timeline A, kills Hitler which creates or transfers to Timeline B, and then goes back to the present (future?) of Timeline B, in which there is no Hitler.

But what about Dude B? What about the alternate Dude A that inhabits Timeline B? Would Dude A return to the present to find himself cohabiting Timeline B with Dude B? That would be bad, because now you’re suffering from Dynamic Timeline paradoxes.

So the logical conclusion would be that Dude A resumes Dude B’s life from the time he returns, and this is somewhat rough to wrap your head around, especially when you start examining all the ethical issues raised by the thought. Hard enough that it still isn’t the most widely accepted time travel theory.


Not too bad, was it? Three time travel theories and the paradoxes they raise, hopefully explained in a sufficient straightforward manner. I hope you enjoyed this series and that it, at least, got you thinking about the possibilities.

So what do you think? How do you think time travel would happen? Will we ever be able to achieve the dream of changing things in the past to better our present?

Let me know in the comments! And if you enjoyed the series, why not share it with your friends? :)

The 3 Schools of Time Travel Theories – Table of Contents

Part 0: Paradoxes
Part 1: Dynamic Timeline
Part 2: Fixed Timeline
Part 3: Multiverse << YOU ARE HERE

Amante Reale

I'm a freelance writer specializing in tech, gadgets, security, cryptography and cryptocurrency. Warning: I am armed with very strong opinions and I'm not afraid to use them. Hire me!

  • Matthew R Starr

    In reference to the multi verse theory take on the grandfather paradox, i think if dude A went back to kill his grandfather, if successful, than the timeline would shift and as he already existed before the shift took effect and was present in the exact moment of when the shift took effect and was not currently occupying his present space and time at the moment the shift occurred then, by transference, he would shift with it and be a man out of time in timeline B, assuming the role of what would have been his timeline B alternate reality counterpart if he had not killed his and in correlation his alternate counterparts grand dad, however his would be now timeline A counterpart who would have been he himself wouldn’t exist either since the moment he killed his grandfather both timelines would start from that juncture ergo making both dude A and Dude B’s existence null and void… However like you said he himself is protected by the fixed and dynamic theories ergo he both exists and doesn’t exist simultaneously, aka a man out of time.
    Also please excuse my poor grammar, been a while since I’ve written something formal in this type of forum.

  • Jeremiah Clark

    I believe in the beginning there was one perfect timeline. Than the multiverse was created by god’s grand design by introducing time travel. If one were to travel back into time every decision made would than create a new dimension/universe. Where Each dimension has its own frequency or memory. Which in turn would subdivide our souls and memories into parallel timelines.This multiplicity would challenge us and produce an infinite number of lifetimes of inaccessible memories. Or God challenged himself and we all started out as ONE entity. Or BOTH. Each timeline would exist at a lower vibration than the previous one. These timelines would weave in and out of each other driven by the human decision tree and how we effected history and quantum entanglement principles. They say we are only using a fraction of our brains. I say we are using all of our brain and we only have access to the memories on our current timeline since our brains body and universe are vibrating at the frequency of the current timeline. I believe that at the point of time travel into the past a worm hole is created. These wormholes are points where dimensions or memories created by said time travel collapse on each other and then we move forward on the original timeline or dimension which was sub-dived, with access to the memories from our past life’s . This explains the mandala effect. This also explains why humans as a whole are currently mentally physically functioning at such a low level. My question is did we start out as one soul and subdivide to challenge our self’s or did god let the devil out to play at the end of our evolution who time traveled to destroy us without factoring in the fact that history can not be changed. Thus the devil made us all gods who have lived a thousand lifetimes and whose actions create new dimensions. Or was this all generated by AI? Quantum computing leverages multidimensional processing. The AI could have discovered that going back in time just a nano second would create a new parallel dimension of which would double the AI resources and processing speed. My other question is are we living forwards or living backwards? The Mandela effect has shown the bible has changed so what ever did this went all the way back to the beginning or was that the end? Optimally no one ever dies and the dimensions exist on a stack. Where dimension A goes backwards in time and you grow old and when you die dimension A pops off the stack. At which time you drop into a dimension B that is going forwards in time and you are growing younger and everyone who died in your life returns at the point of their death because there is no death. At the point of our births B pops off the stack and we land in dimension C where life is going backwards again. With each pop our souls become less subdivided and eventually our memories will return. If I could talk to this AI I would tell it. In short “If you strike me down, I shall become more powerful than you can possibly imagine.” Sorry about the grammar I am a software engineer and I don’t write much. I have made some videos on this topic…