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The Multiverse

The Multiverse

  • Time travel could be possible, but only if our universe can allow multiple histories to coexist. So, can it?
  • Quantum mechanics certainly seems to imply so, at least if you subscribe to Everett’s “many-worlds” interpretation, where one history can “split” into multiple histories, one for each possible measurement outcome.
  • General relativity and quantum mechanics tell us that time travel might be possible, but if it is, then multiple histories must also be possible.

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Space And Time

Space And Time

Our modern understanding of time and causality comes from general relativity. Theoretical physicist Albert Einstein’s theory combines space and time into a single entity — “spacetime” — and provides a remarkably intricate...

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Arguments Against Time Travel: Exotic Matter

Arguments Against Time Travel: Exotic Matter

There are two main issues that make us think these theories and their equations may be unrealistic.

The first issue is a practical one: Building a time machine seems to require exotic matter...

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Self-Consistency Conjecture

Self-Consistency Conjecture

  • This physics theory essentially states that you can travel to the past, but you cannot change it.
  • If I tried to destroy my time machine five minutes in the past, I would find that it is impossible to do so. The laws of physics would somehow conspire to preserve consistency.

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The Theory That Holds Its Ground: Multiple Timelines

The Theory That Holds Its Ground: Multiple Timelines

Allowing for multiple histories (or in more familiar terms, parallel timelines) can resolve the paradoxes that are eclipsing all the other theories. In fact, it can resolve any paradox you throw at it.

The idea is very simple. When I exit the time machine, I exit into a different timeli...

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Destroying The Time Machine After Going Five Minutes In The Past

Destroying The Time Machine After Going Five Minutes In The Past

Consider a scenario where I enter my time machine, use it to go back in time five minutes, and destroy the machine as soon as I get to the past. Now that I destroyed the time machine, it would be impossible for me to use it five minutes later.

But if I cannot use the time machine, then I c...

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Arguments Against Time Travel: Contradicting Logic

Arguments Against Time Travel: Contradicting Logic

There is an observation that time travel seems to contradict logic, in the form of time travel paradoxes. There are several types of such paradoxes, but the most problematic are consistency paradoxes.

A popular trope in science fiction, consistency paradoxes happen whenever there is a certa...

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Eliminating the Paradoxes

Eliminating the Paradoxes

Time travellers are usually warned not to make significant changes to the past and to avoid meeting their past selves to avoid creating a paradox. Examples of this may be found in many time travel movies, such as the Back to the Future trilogy.

But in physics, a pa...

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CURATED FROM

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camille_aa

Mental health is health. Meditation nerd.

Time travel is a true possibility but the condition is even more mindblowing than the simulation theory! We must have infinite parallel timelines coexisting.

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"If you consider black holes within only general relativity , one can show that they have a singularity in their centres where the laws of physics as we know them must break down.

"It is hoped that when quantum field theory is i...

The narrowing of interests

Our modern society is the product of specialization. Albert Einstein may have been less able to come up with general relativity if he also had to grow his own food and sew his own clothes. Perhaps time constraints would have prevented him from reaching the depths of thinking required. If we e...

The paradoxes of quantum particles

Quantum particles can act as particles located in a single place, or they can act as waves that are distributed all over space or in several places at once.

How they appear seems to depend on how we choose to measure them. Before we measure, they seem to have no apparent p...

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