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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 certain event that leads to changing the past, but the change itself prevents this event from happening in the first place.
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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...
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...
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...
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...
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...
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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