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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 certa...
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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"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...
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...
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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