Einstein’s special theory of relativity combines space and time into one dynamic, unified entity – spacetime.
But if time is connected to space, could the universe be anything but deterministic? And does that mean that the future is predestined
PBS Space Time explores what this means.
Sabine Hossenfelder explains why free will is incompatible with the currently known laws of nature and why the idea makes no sense anyway.
Compare this with John-Paul Sartre’s “We are condemned to be free.”
Sounds like a perfect debate topic for Philosophy Friday here on Frank’s World.
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Sabine Hossenfelder explains what differential equations are, go through two simple examples, explain the relevance of initial conditions and how differential equations generally work, and then discuss what this means to the question whether the future is determined already.
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PBS Space Time explains why quantum computing may wreak havoc on our modern digital society.
In this video, Sabine Hossenfelder explains how public key cryptography works on the internet today, using RSA as example, what the risk is that quantum computers pose for internet security, what post-quantum cryptography is, how quantum key distribution works, and what quantum cryptography is.
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Here’s a selection from Lex Fridman’s conversation with Stepham Wolfram.
I remember watching this on TV when I was a kid and it blew my mind.
It is hands-down the best explanation of four dimensions, curved space, and more – all done in Carl Sagan’s trademark awesomeness.
Geek’s Lesson provides this full nine hour source on quantum mechanics.
Quantum mechanics (QM; also known as #quantum #physics, quantum theory, the wave mechanical model, or #matrixmechanics), including quantum field theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles.
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This video is about Bell’s Theorem, one of the most fascinating results in 20th century physics.
Even though Albert Einstein (together with collaborators in the EPR Paradox paper) wanted to show that quantum mechanics must be incomplete because it was nonlocal (he didn’t like “spooky action at a distance”), John Bell managed to prove that any local real hidden variable theory would have to satisfy certain simple statistical properties that quantum mechanical experiments (and the theory that describes them) violate.
Since then, GHZ and others have managed to extend the theoretical work, and Alain Aspect performed the first Bell test experiment in the late 1980s.
Sabine Hossenfelder explains one of the most common misunderstandings about quantum mechanics — that quantum mechanics is about making things discrete or quantifiable.
This must be one of the most common misunderstandings about quantum mechanics, But is an understandable misunderstanding because the word “quantum” suggests that quantum mechanics is about small amounts of something. Indeed, if you ask Google for the meaning of quantum, it offers the definition “a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.” Problem is that just because energy is proportional to frequency does not mean it is discrete. In fact, in general it is not.
