Spin Networks - Carlo Rovelli
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- Опубліковано 5 гру 2019
- Oxford Mathematics Roger Penrose Public Lecture: Carlo Rovelli - Spin networks: the quantum structure of spacetime from Penrose's intuition to Loop Quantum Gravity
Leading Physicist and best-selling author Carlo Rovelli pays tribute to one of his scientific heroes, Roger Penrose, as he tells the story of how Roger foretold the appearance of Spin Networks twenty years before they came in to use as a way of explaining quantum spacetime.
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Carlo Rovelli is one of the most beautiful human minds in this era
Agree!
Nice lecture. I wish you also included the questions/answers, which in my opinion, are also part of a talk, in some sense. I think that people would benefit from the discussion following the talk (just a suggestion).
Absolutely well done and definitely keep it up!!! 👍👍👍👍👍
Just wow
Where is the spin component
Numbers on the graph as far as I'm aware
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Aryabhatta g..🇮🇳🇮🇳
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That audience member making sure everyone takes home whatever he's got...
Great H onor
@11:00 but this is the precise issue, is spacetime really "quantum"? And in what sense? Because there is zero evidence for gravitational superpositions (admittedly the Feynman-Aharonov experiments are incredibly difficult, so maybe someone will refute me in a decade or so?). Until that time, all this "quantize gravity" stuff is pure speculation with no experimental backing. What we know for sure is that the elementary interactions are quantum mechanical, but they are not global spacetime events. So I mean... for cryin' out loud! The obvious more parsimonious idea would be gravity is already "quantum" and that is by virtue of the Planck-scale (or thereabouts) degrees of freedom in GR, which classical GR ignores (rightfully so). The lesson is: do not try to _re-quantize_ gravity, it was already a quantum theory, once you admit Planck scale non-trivial topology. Every decent physicist knows,what that implies: closed timelike curves --- but which are not macroscopically traversable. That implies quantum mechanics. The true problem is to figure out what the topological degrees of freedom are that giver the Standard Model (or a broken higher symmetry spectrum).
If you want to explore such ideas try my blog where I write _very_ informally about this stuff: t4gu.gitlab.io/t4gu/ ---- it's only for crazier students and crackpots who know they are crackpots (so not true crackpots) though, don't expect any solutions.
học như thế này ko tốn giấy à?
No.
Pretty ironic that Carlo Rovelli thinks quantum biology is bunk when "Roger" is at the same time promoting quantum biology!! hilarious.
Assuming what you're saying is true, we have the following facts:
1. Carlo Rovelli greatly admires Roger Penrose (from this video).
2. Penrose supports quantum biology.
3. Rovelli strongly opposes it.
So what? Where's the scandal in that? Do people have to totally agree before they're allowed to admire each other?