I got nothing, but recall an old joke... "Magic is real, unless declared int!"
Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
161–170 of 191 posts
Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#162Earlier quoted context omitted.
With QM there’s no pure point particles.
No, but you can talk about changes in perturbations of fields over time in QFT (which has its own representational issues). A particle is a useful metaphor.
> A particle is a useful metaphor
I disagree, an actual point particle with a mass should have an event horizon. Using terms without baggage helps avoid such misleading assumptions.
Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#163Earlier quoted context omitted.
How does this cause a point particle to accelerate towards the sun? Must be something about the gradient, but how does the gradient of time cause you to curve towards the sun?
That's a great question. The answer is, the stuff you are reading in this thread is not right (you figured it out). The real version of the story is, there is this thing called the "Christoffel symbol," which tells you where, at every point in space, you would end up if you went in a certain direction, including which way you would be facing if you went that way. It relates three vectors: your direction of motion, th…
For a nice introduction to relativity, look at The Einstein Theory of Relativity: A Trip to the Fourth Dimension by Lillian R. Lieber. $15 on Amazon. Written in 1945 and still quite good.
Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#164"Einstein cast gravity not as a force but as the geometric bending of space and time. In a popular analogy, the fabric of space-time is like the flat expanse of a mattress, and a massive object like a star is like a bowling ball sitting on top. The weight of the bowling ball compresses the mattress, forming a dimple — matter tells space-time how to curve. In this analogy, a planet is like a smaller ball. If it rolls…
I never liked the mattress analogy, because if gravity is the bending of the mattress, what is pulling the ball down the slope?
I agree. The analogy is using our intuition of how objects move because of gravity to explain gravity. It has always seemed circular to me. I bet there is a better analogy.
Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#165Strictly from a linguistic perspective: what a terrible and dumb term ('magic') to try and introduce into physics.
How does gravity work? Magic!
Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#166Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#167Earlier quoted context omitted.
Imaginary numbers are purely theoretical, but they turn out very helpful in almost every engineering discipline
Imaginary numbers are a helpful tool for calculating things in our universe. All these holographic theories and their insights are based on a universe that behaves basically opposite to ours.
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Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#168Earlier quoted context omitted.
Imaginary numbers are purely theoretical, but they turn out very helpful in almost every engineering discipline
Sure, let me know when any of these imaginary physics is useful for predicting anything that can be observed.
Not a physicist, but I think this paper used holographic principles to predict the minimum ratio of shear viscosity to volume density of entropy in fluids https://arxiv.org/pdf/hep-th/0405231
Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#169Earlier quoted context omitted.
No, but you can talk about changes in perturbations of fields over time in QFT (which has its own representational issues). A particle is a useful metaphor.
> A particle is a useful metaphor I disagree, an actual point particle with a mass should have an event horizon. Using terms without baggage helps avoid such misleading assumptions.
No metaphor is perfect.
Re: Entanglement Builds Space-Time. Now "Magic" Gives It Gravity
#170> a measure of quantumness known as “magic.” This naming-proposal couldn't possibly cause any problems down the line... > They had worked out a way of running software on a classical computer that would mimic a quantum task. When it comes to using a regular computer to mimic (read: fake) the execution of an exotic program/API for nonexistnet future hardware, I highly recommend the humorously titled talk: "Temporally…
I guess we can no longer use this phrase: "The best kind of science is magic, and the best kind of magic is science."
> "The best kind of science is magic, and the best kind of magic is science."
Who has ever used that phrase?