It feels like Sean Carroll and team took a shortcut to the intended outcome of the Wolfram project. Rather than creating hypergraphs and vertices to see if reality emerges from the data, they used hilbert spaces as the hypergraphs, hamiltonians as the nodes, entanglement and locality as the rules for creating the vertices, and perturbation theory as the means to show the evolution of the model over time. The fact that hilbert space/hypergraph topologies create structures that mimic spacetime and Einstein's field equations is super exciting. The way Sean explains it makes you feel like it should have been obvious, even if it is only through hindsight. What an incredibly gifted teacher and thinker. I feel so lucky to exist simultaneously with him.
Yes finally someone bridging the gap for undergraduates, yet if computation needs rerendering into the mind by both sides for reverse propagation by convolution scattering displacement
This was an amazing video! The fact that locality and also the preferred description of the world as position (and not momentum) follows from quantum mechanics and the interaction between the system, environment and the observer is groundbreaking I think. At least it is for me. This feels like a 3. revolution in our understanding of nature: First Einstein's relativity (special and general), then "classical" quantum mechanics (with the collapse of the wave function) and now the merger of geometry and classical structure with the 2 other. This feels like an accurate description of what John Bell proved with his theorem, one that can be understood in the sense that it explains why the results of quantum mechanics are not really something fundamental different than what we humans observe classically.
Quantum mechanics doesn't lead to locality. In quantum mechanical systems we only have energy, momentum, angular momentum and charges. What leads to locality is the breaking of relativity by a matter background. This was derived theoretically first in 1929 by Mott.
So in QM there is this notion of superposition where individual electrons create an interference pattern. Given that empty space is teeming with waving quantum fields and particles popping in and out of existence is it not reasonable to assume that these will exhibit some brownian type force like “walker” oil droplets bouncing on a sound wave? I’m sure this has been accounted for but can someone explain to me why these virtual particles popping in and out don’t have any effect on single electrons or photons. I realise I’m kind of advocating a kind of hidden variables theory. 🤔
A good talk by Prof Carroll. However, I found myself deeply annoyed by Dr. Minev's on-screen behavior - he seemed distracted the entire talk, doing other things and barely paying attention. If you are going to do that, at least shut your camera off. I really like the general idea of building up basic low-energy physics from a wave equation and the emphasis on what the state is, and draw a clear line between it and it's dynamics. I'm a little skeptical that there isn't some circularity in your reasoning, or that you've avoided the "collapse" problem (it seems like you've just renamed the phenomena "pointer observables"). I'm not sure if this is useful, but for a long time I've known that a universe with only linear motion could never yield intelligent observers. Therefore not just locality but circular motion (or bound motion) should inform your choice of Hamiltonian, too. (And in real life this bound motion happens at several scales, from atoms to galaxies, with humans somewhere in there).
HE SOUND LIKE A FRAUD, people listen to the guy BUT he never make sense. He probably memorized it but cant understand what he's talking about. He could've explain SpaceTime simply but changed to subject, throwing out other theories like smoke screens
@seancarroll, what you claim is false, as I show in this paper: *3D-Space and the preferred basis cannot uniquely emerge from the quantum structure* Hilbert-Space Fundamentalism (HSF) states that the only fundamental structures are the quantum state vector and the Hamiltonian, and from them everything else emerge uniquely, including the 3D-space, a preferred basis, and a preferred factorization of the Hilbert space. In this article it is shown that whenever such a structure emerges from the Hamiltonian and the state vector alone, if it is physically relevant, it is not unique. Moreover, HSF leads to strange effects like "passive" travel in time and in alternative realities, realized simply by passive transformations of the Hilbert space. The results from this article affect all theories that adhere to HSF, whether they assume branching or state vector reduction (in particular the version of Everett's Interpretation coined by Carroll and Singh "Mad-dog Everettianism"), various proposals based on decoherence, proposals that aim to describe everything by the quantum structure alone, and proposals that spacetime emerges from a purely quantum theory of gravity. arxiv.org/abs/2102.08620
Sean Carroll simply doesn't understand the phenomenology of quantum mechanics. That's not unique to him. It happens to a lot of theorists. He is just extremely vocal about his false ideas. ;-)
Excellent seminar! Sean Carrol always has fantastic lectures/seminars/videos. This has a great mix of general & indepth information.
Thank you Qiskit
Mr. Carroll is amazing! Thank you Qiskit and TH-cam.
It feels like Sean Carroll and team took a shortcut to the intended outcome of the Wolfram project. Rather than creating hypergraphs and vertices to see if reality emerges from the data, they used hilbert spaces as the hypergraphs, hamiltonians as the nodes, entanglement and locality as the rules for creating the vertices, and perturbation theory as the means to show the evolution of the model over time. The fact that hilbert space/hypergraph topologies create structures that mimic spacetime and Einstein's field equations is super exciting.
The way Sean explains it makes you feel like it should have been obvious, even if it is only through hindsight. What an incredibly gifted teacher and thinker. I feel so lucky to exist simultaneously with him.
Damn this was amazing. Such an exciting time in physics. Thanks Sean
Yes finally someone bridging the gap for undergraduates, yet if computation needs rerendering into the mind by both sides for reverse propagation by convolution scattering displacement
This was an amazing video! The fact that locality and also the preferred description of the world as position (and not momentum) follows from quantum mechanics and the interaction between the system, environment and the observer is groundbreaking I think. At least it is for me. This feels like a 3. revolution in our understanding of nature: First Einstein's relativity (special and general), then "classical" quantum mechanics (with the collapse of the wave function) and now the merger of geometry and classical structure with the 2 other. This feels like an accurate description of what John Bell proved with his theorem, one that can be understood in the sense that it explains why the results of quantum mechanics are not really something fundamental different than what we humans observe classically.
Quantum mechanics doesn't lead to locality. In quantum mechanical systems we only have energy, momentum, angular momentum and charges. What leads to locality is the breaking of relativity by a matter background. This was derived theoretically first in 1929 by Mott.
I would also like Sean to invite Zlatko to his Mindscape podcast and talk about the current status of quantum computers!
WOW!
I try to explain the states are all only proportional to percentages of what outcomes are by sets of sets of percentage of outcomes
So in QM there is this notion of superposition where individual electrons create an interference pattern. Given that empty space is teeming with waving quantum fields and particles popping in and out of existence is it not reasonable to assume that these will exhibit some brownian type force like “walker” oil droplets bouncing on a sound wave? I’m sure this has been accounted for but can someone explain to me why these virtual particles popping in and out don’t have any effect on single electrons or photons. I realise I’m kind of advocating a kind of hidden variables theory. 🤔
Nah, none of this stuff works this way. You are watching too much TH-cam instead of spending time in the physics library. ;-)
Salve come va
A good talk by Prof Carroll. However, I found myself deeply annoyed by Dr. Minev's on-screen behavior - he seemed distracted the entire talk, doing other things and barely paying attention. If you are going to do that, at least shut your camera off. I really like the general idea of building up basic low-energy physics from a wave equation and the emphasis on what the state is, and draw a clear line between it and it's dynamics. I'm a little skeptical that there isn't some circularity in your reasoning, or that you've avoided the "collapse" problem (it seems like you've just renamed the phenomena "pointer observables").
I'm not sure if this is useful, but for a long time I've known that a universe with only linear motion could never yield intelligent observers. Therefore not just locality but circular motion (or bound motion) should inform your choice of Hamiltonian, too. (And in real life this bound motion happens at several scales, from atoms to galaxies, with humans somewhere in there).
Carroll's arrogant deportment distorts human spacetime.
HE SOUND LIKE A FRAUD, people listen to the guy BUT he never make sense. He probably memorized it but cant understand what he's talking about. He could've explain SpaceTime simply but changed to subject, throwing out other theories like smoke screens
@seancarroll, what you claim is false, as I show in this paper:
*3D-Space and the preferred basis cannot uniquely emerge from the quantum structure*
Hilbert-Space Fundamentalism (HSF) states that the only fundamental structures are the quantum state vector and the Hamiltonian, and from them everything else emerge uniquely, including the 3D-space, a preferred basis, and a preferred factorization of the Hilbert space.
In this article it is shown that whenever such a structure emerges from the Hamiltonian and the state vector alone, if it is physically relevant, it is not unique.
Moreover, HSF leads to strange effects like "passive" travel in time and in alternative realities, realized simply by passive transformations of the Hilbert space.
The results from this article affect all theories that adhere to HSF, whether they assume branching or state vector reduction (in particular the version of Everett's Interpretation coined by Carroll and Singh "Mad-dog Everettianism"), various proposals based on decoherence, proposals that aim to describe everything by the quantum structure alone, and proposals that spacetime emerges from a purely quantum theory of gravity.
arxiv.org/abs/2102.08620
Sean Carroll simply doesn't understand the phenomenology of quantum mechanics. That's not unique to him. It happens to a lot of theorists. He is just extremely vocal about his false ideas. ;-)