Sean Carroll on Causality and the Arrow of Time
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- Опубликовано: 28 май 2024
- Sean Carroll speaking at the 6th International FQXi Conference, "Mind Matters: Intelligence and Agency in the Physical World."
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How does this not have more likes? I just don’t understand the world these days. Thank you for the information. I truly appreciate it.
Because it doesn’t talk about flat earth or microchips in vaccine 🙄
Tuff crowd.
The best use of the Fund's money! Thanks Sean! I think in the world, very many engineers and scientists who were thinking a very long time about entropy and information, come to very similar conclusions. I wonder how will it play out. Also recommend to check Susanne Still for a great deal of overlap between causality and computation. Thanks Max for starting all of this!
" It was founded in 2005 by cosmologists Max Tegmark and Anthony Aguirre"
I didn't know that.
I'm just reading a book by Sean Carroll, he's well-read and has deep understanding.
I remember the chap (Robert) on Closer to Truth asking Sean if "Information is the basic building block of reality", other guests had waffled, Sean Carroll just said, "No"
Thermalization requires computation, which is all in our head. Sean is brilliant! Information and its processing are absolutely not the basis of this reality, but paradoxically our consciousness might. Have you read Something Deeply Hidden? Goes great with Helgoland and even Federico Faggin's Silicon!
@@briancannard7335 "Something Deeply Hidden" No, they don't have it in the library.
But I watched Sabine expose the errors of PBS Spacetime and Don "Fermi Lab" Lincoln for their incorrect interpretations of the Quantum Eraser.
She ended by saying "You can trust Sean Carroll on the quantum stuff".
He'd written a blog correctly interpreting the QE experiment.
6:35 Me pretending I get it
That big smile on his face. ... "Ah yes, the center of mass coordinates...."
watching in 144p thought that egg was a galaxy 3:32
Hahaha
Infinity seems to have an affinity to be more infinite.
Here cuz of Tenet!
my head hurts,but I'll be back
good
the most important part, at the end, where he is actually saying why causality suddenly needs a direction (which i think is highly implausible as a conclusion, given everything he said before, why even try to get to this conclusion? zero need for it, just go with "we can talk about causality both ways, but given how our knowledge of past and future differ, we do not have much need for talking about how the future causes the past") was pretty unclear to me. at that point, it seemed like ONLY purely mathematical stuff, nothing i could get a grip on.
2:04 slight correction “number of different microstates corresponding to *same* macrostate”
1:05 Because cats are known for their grudge and they still hold one for Schrödinger's.
Some days the comment section makes days just that tad bit better..
At the end of 2001, a very old Keir Dullea knocks a glass of wine over.
Cause and effect is omnipresent in our everyday lives, as well as in quantum mechanics.
And if in modern philosophy this concept (cause and effect) causes controversy,
then this is due to a misunderstanding of the essence of quantum mechanics.
----
''If you are not completely confused by quantum mechanics, you do not understand it''
/ John Wheeler /
''Quantum mechanics makes absolutely no sense'' /Roger Penrose/
"Nobody understands quantum mechanics and that's a problem". /Sean Carroll/
I watched this video tomorrow.
Darcy Whyte cya sooner
There are more words in this 21 min video than in a typical Stephen King book
Sean is the man
14:56 Meanwhile, actual life goes on parallel to the calculator deciding the right equation.
Sean, please come back to Columbia I have a million questions for you.
Dudes so smart
The reason the wine glass spilled , is because the previous 3 glasses did not. I have tested this to ad nauseam.
Is it possible to imagine, consistent with the known basic Laws O' Physics (TM), but ignoring the kaon, an hypothetical cosmos containing two regions where the arrow of time, and the entropy gradient through time, is reversed, the one region compared to the other, with, in each of the regions, information-processing entities that can remember the past and decide what to do in the future? When I say "future", I mean in the direction of increasing entropy in that region.
Can we, whose origin is the Big Bang and whose fate is the heat death, construct a time-reversed "and" gate?
Can we, whose origin is the Big Bang and whose fate is the heat death, construct a temporary arrangement in a confined space, where the arrow of time is reversed?
Suppose we build a spherical shell and suspend in the middle of it, on a stalk, a little ball. The stalk contains refrigerant lines or thermocouple wires so that by using an apparatus external to the spherical shell, we can refrigerate the little ball that is in the middle. Suppose we do that, and we also heat the outer shell. Inside the shell, the shell will radiate inward due to its blackbody radiation. The little ball in the middle will absorb this energy. Again, inward radiation. This is the opposite of the circumstance of humanity, where we live near a hot ball that is radiating outward to the relative coolness of the CMB. Does the apparatus I described create a local and temporary region where the arrow of time is reversed?
..first? Or last?
I don't think you got abrogated right.
4:50 Physists making the case for AI. Certainly, human could not have no information at all, unless we're talking about an AI with a manipulable memory.
The laws of physics work in the present, but do these actually work at 13.6 billion years ago? We know about 5% of the mass of the universe, but not about dark matter and dark energy. Clearly we are missing something! But what?
Time DILATION proves that ELECTROMAGNETISM/ENERGY IS GRAVITY.
By Frank DiMeglio
You appear to have decided that the Universe is deterministic. Do you think that a computer simulation of quantum mechanics might have any use for a random number generator? Access to an RNG gives us access to the Vernam Cipher which may be useful in dealing with spooky action at a distance. There could be a lot hanging on your answer.
Personally I think a computer simulation should be modelling tachyonic Brownian motion for objects much lighter than the Planck mass, which means a random choice between a spacelike and timelike numerical integration. It should model classical Brownian motion for heavier objects like observers, which is merely decoherence in other language. My RNG will be kept busy.
If one really wants the low down on Causality, listen to David R. Hawkins. It will flip your mind in a good way.
second
I find this very hard to poop too.
nope
OK, so I'll watch these when people admit time is a concept, not something we sense.
Mr. Shashi Singh (an excellent instructor of physics who is honest) has given the below writing the thumbs up. Moreover, he wrote: "Awesome !" and "Absolutely right."
Excellent !!!
It's all clearly correct.
THE TRULY SUPERIOR UNDERSTANDING OF PHYSICS/PHYSICAL EXPERIENCE:
E=mc2 is DIRECTLY AND FUNDAMENTALLY DERIVED from F=ma. Carefully consider what is THE SUN. The Sun is E=mc2. The Sun is ALSO F=ma. This explains the PERPETUAL MOTION of the Sun, AS gravity/acceleration involves BALANCED inertia/INERTIAL RESISTANCE; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. GREAT !!! ACCORDINGLY, GRAVITATIONAL force/ENERGY IS proportional to (or BALANCED with/as) inertia/INERTIAL RESISTANCE; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. (Very importantly, outer "space" involves full inertia; AND it is fully invisible AND black.) ALL of SPACE is NECESSARILY electromagnetic/gravitational (IN BALANCE), AS ELECTROMAGNETISM/ENERGY IS GRAVITY. This is, IN FACT, proven by F=ma AND E=mc2. (BALANCE AND completeness go hand in hand.) So, consider what is c (A POINT, A PHOTON). A PHOTON may be placed at the center of THE SUN (as A POINT, of course), as the reduction of SPACE is offset by (or BALANCED with) the SPEED OF LIGHT; AS ELECTROMAGNETISM/ENERGY IS GRAVITY. Gravity IS ELECTROMAGNETISM/ENERGY.
The BALANCE of being AND EXPERIENCE is essential. Dreams balance being AND EXPERIENCE. In dreams, it is you AND other than you are IN BALANCE. Indeed, there is no outsmarting the GENIUS of dreams. Dream experience is/involves true/real QUANTUM GRAVITY. MOST IMPORTANTLY, in dreams, BODILY/VISUAL EXPERIENCE is invisible AND VISIBLE IN BALANCE. (THE EYE IS THE BODY.) Dreams make thought MORE LIKE sensory experience in general, thereby improving upon memory AND UNDERSTANDING. INDEED, the ability of THOUGHT to DESCRIBE OR RECONFIGURE sensory experience is ULTIMATELY dependent upon the extent to which THOUGHT IS SIMILAR TO sensory experience. MOREOVER, it is ALSO a very great truth that THE SELF represents, FORMS, and experiences a COMPREHENSIVE approximation of experience in general by combining conscious and unconscious experience. (THOUGHTS ARE INVISIBLE.) Dream experience is possible/potential AND actual IN BALANCE. BALANCE AND completeness go hand in hand. Dream experience is always that of what is the BALANCED MIDDLE DISTANCE in/of SPACE. GREAT. Dreams combine, BALANCE, and include opposites.
By Frank DiMeglio
👀
Ugh. Gave up half way in because Dr Obvious wouldn't get to a point.
I can't get through this, because Carroll is far too intelligent to be speaking so much nonsense. Reversibility means that the events could run the other way, but "run the other way" has NOTHING to do with the direction of time. It means that the states which were the later ones in one case could have been the starting point and then things could have evolved (forward in time, of course; how else would things go from initial states to later ones??) in the reverse order.
When he says "there are as many possible pasts as futures" he somehow forgets that the past is no longer possible, but has already occurred. There is a fact of the matter about what happened, but there are possibilities about what will happen.
Much of this conceptual confusion is because we are obliged to draw diagrams where time is a coordinate just like spatial coordinates. But that's not what time is at all. States of affairs actually change and evolve. We should be more certain of that than we are that Solipsism is false and there are actually other people and laboratories and books, etc., because it could all be an illusion and still the illusion would evolve and change. If it were a static 4d painting, we wouldn't be thinking about it, since thinking is a dynamic process, and the sketch on paper of a dynamic process is not itself a dynamic process. It's just a tool for talking about such processes.
Anyway, I'm sure my irrelevant RUclips comment isn't going to change that brilliant physicists speak nonsense, but I had to vent a little.
If you believe the structure of the universe is deterministic, there are no "possibilities about what will happen." There is only one possible future, just as there is only one past.
@@aaron2709
Fair enough, but there was never any option for there to be possibilities about the past, regardless of determinism.
@@Mentat1231 Yes. You can't take everything he says as literal application. Sometimes he's talking about the purely theoretical dimension of an idea (like the arrow of time) and what those theoretical dimensions might imply for the actual universe.
@@aaron2709
The problem is that physicists and cosmologists actually do mean this sort of thing. For example, the thing he mentioned about dynamics equations running both ways, as though that had anything to do with the direction of earlier to later. Even otherwise "brilliant* people (like David Albert, and even Sean Carroll himself) actually take that seriously as saying something about the directionality or fundamentality of time.
@@Mentat1231 This talk is about the seeming contradiction between a deterministic universe, which MUST be symmetric (the only way we can know past states in the universe or make predictions about the future) contrasted with the asymmetric conception of the universe where past and future are ALWAYS different because of entropy. Sean Carroll is not confused about this seeming paradox... that's the subject of the lecture. Watch it again and you'll see this.