Genius: Off-topic, at that spot is a novel cool 2-minute excerpt from Genius showing how Einstein met Mileva Marić, his showtime wife, afterward she trumped him inward a physics examination together with some ancient Greek physical philosophy. ;-)In early on 2009, Smolin together with some other crackpot frequently mentioned on this weblog wrote a newspaper promoting hippie non-solutions to the dark hole data paradox which they laughably called "conservative solutions". More or less every aspect of that newspaper was completely wrong together with ludicrously wrong – Smolin's co-author lately admitted (bragged, I would say) that she realizes that every newspaper she has ever written on quantum gravity has been worthless garbage but she wrote them, anyway, because she was able to really acquire money for this garbage.
I retrieve that fraudulent scumbags similar that should live spending years inward prison theatre or minutes on a rope. The reality is different: actual physicists can't fifty-fifty holler at this scum. In fact, they are fifty-fifty afraid of publishing their call piece overly politely criticizing them, equally nosotros volition encounter momentarily.
Two days ago, at the notorious website of his beau crackpot Peter Woit, Smolin tried to defend the indefensible – his hippie newspaper with Hossenfelder together with the dark hole remnants.
In his showtime comment, Smolin just superficially reiterates that theirs is a "conservative solution" together with refers to the would-be government similar Rovelli together with Ashtekar. He also mentions that the dark hole interior is a "bag of gold", a big book of space, equally Smolin puts it. But the "bag of gold" is irrelevant for this whole give-and-take close remnants – because the dark hole exterior is completely sufficient to encounter why they can't operate – together with Smolin fifty-fifty describes the important of the "bag of gold" totally incorrectly.
The "bag of gold" isn't the regular dark hole interior. Instead, this term past times John Wheeler refers to a item merger of a dark hole together with FRW cosmological spacetimes.
At whatever rate, again, phrases such equally the "bag of gold" receive got nil to practise with the reasons why the dark hole remnants can't exist. Some of the actual reasons were summarized past times a commenter nicknamed "Reader" – plainly a professional person researcher inward the dark hole data industry. As I already mentioned, it's no coincidence that the people who really receive got a clue are hiding their names – they must believe that they must live doing so. It's pathetic. He or she wrote:
Lee, this proposal has features that acquire inward seem non so conservative afterward all. As is good known, if the thermality of the radiations solely breaks downwards 1 time the dark hole becomes of Planckian mass, together with so the remaining object must decay over a really long timescale for its radiations to purify the total state. Indeed this timescale tin dismiss live made arbitrarily long past times increasing the majority of the master copy dark hole. So this scenario requires really long lived remnants. More seriously perhaps, it seems impossible to brand this operate for a dark hole formed inward AdS. Putting aside anything to practise with AdS/CFT, AdS acts similar a finite sized box, so a nation of radiations of total liberate energy \(M_{\rm Pl}\) has a pocket-sized maximum entropy. In this instance at that spot is no way for a Planckian remnant to decay into a gas of (arbitrarily) high entropy quanta whose nation would purify that of the Hawking radiations emitted earlier. So piece it is logically possible for dark holes to release their data inward Hawking radiations inward asymptotically apartment infinite (while solely modifying Planck scale physics) this seems impossible inward AdS. I give away that highly problematic.OK, what did "Reader" say? If the development is unitary but the dark hole evaporation is just thermal equally long equally the dark hole is significantly greater than a length scale comparable to the Planck length, together with so the lastly decay products of the remnant must send the whole information. In a really infinite spacetime such equally the Minkowski space, the huge data from the initial "solar size" dark hole, to selection an example, may live encoded inward the exact directions or timing of the photons coming from the decay of the remnants.
However, the radiations inward the AdS infinite is basically equivalent to that inward a box. The AdS infinite may live visualized equally a venture cylinder together with massive (and massless) objects are existence repelled (or reflected) from the AdS boundary. The fact that at that spot is an infinite proper book concentrated close the boundary of the AdS (cylinder) doesn't alter the fact that the entropy of the radiations emitted at the AdS middle behaves just similar the radiations inward a box. There are just finitely many momentum modes so the radiations cannot send an arbitrarily high entropy.
OK, the objections past times "Reader" are self-evidently valid together with serious. Smolin replies to them together with claims that they're "fallacious". Does he receive got arguments? No but he has some dumb caricatures of an argument. Smolin says that "Reader" isn't right that the radiations inward AdS has a depression entropy because... the dark hole contains a "bag of gold" which is big together with hence carries a high entropy. Well, inward that case, it's fifty-fifty worse because he clearly violates the 2nd police line of thermodynamics. Influenza A virus subtype H5N1 high-entropy "bag of gold" would receive got to evaporate into the low-entropy AdS radiation!
Smolin wants to dispute the unquestionable comment that the initial dark hole had a high entropy:
Why? To the extent that the overall nation is purified, the entropy is low.What!? Smolin clearly misunderstands the concept of entropy at the really basic level. Undergraduate students should neglect their statistical physics course of teaching if they misunderstand it inward this way. Smolin basically believes, similar many confused students, that the entropy is \[
south = -{\rm Tr}(\rho \ln \rho)
\] together with because you lot may ever assume that the density matrix \(\rho\) is pure, \(\rho=\ket\psi \bra \psi\), the entropy ends upwards existence zero, \(S=0\). But that's non what nosotros hateful past times an entropy of an object. To calculate the entropy, you lot receive got to substitute \(\rho\) that has comparable probabilities for all macroscopically indistinguishable states from the nation you lot are discussing. So whether you lot similar it or not, the entropy of an object is always\[
south \sim \ln N
\] where \(N\) is the number of macroscopically indistinguishable states from the given one. If the entropy could live said to live ever null because it's ever inward regulation possible to assume that the nation is pure, together with so the concept of entropy – together with the whole statistical physics together with thermodynamics – would live totally meaningless, vacuous, worthless, together with null. Crackpot Smolin plainly seems to believe that these disciplines of physics are meaningless, vacuous, worthless, together with null – equally meaningless, vacuous, worthless, together with null equally his inquiry or himself personally.
In the lastly incoherent paragraphs of the comment, nosotros encounter the call of Rovelli piece Max Planck is spelled equally "Plank". The sentences are isolated from each other together with each of them is absolute rubbish. For example, 1 of the lastly ones is
There is no singularity together with this agency no data is lost, whatever the fate of the portion containing it.But all propositions higher upwards are self-evidently wrong. The formation of a singularity cannot live prevented equally long equally gravity industrial plant at to the lowest degree roughly at to the lowest degree at long distances, equally the singularity theorems guarantee. And fifty-fifty if something were qualitatively changed close the singularities, it would receive got no touching whatever on the data loss paradox because the data loss paradox is seen from outside – it solely arises when the interior fully disappears – so this paradox doesn't fifty-fifty receive got to assume that anything within the dark hole number horizon exists!
It's really obvious that just similar his beau crackpot together with co-author Sabine Hossenfelder (and a big fraction of the laymen, equally I learned during many pop talks I gave), Smolin believes that the "key feature" of a dark hole – together with the argue why the data loss employment arises at all together with seems difficult – is the singularity. But this is a consummate delusion. The defining characteristic of a dark hole – together with the showtime locus which produces the dark hole data employment – is the number horizon, non the singularity! This declaration is really elementary. Every competent physicist knows it. The dark hole is a hole because 1 time you lot autumn behind the number horizon, you lot can't acquire dorsum – so it is the number horizon that makes it a "hole". The number horizon also makes it dark because non fifty-fifty low-cal may escape from the points beneath the horizon. And the same number horizon is also the root of the data loss paradox because the data cannot escape from beneath the horizon. In all these questions, it's the number horizon where the novelties together with potential hurdles arise. The singularity is just an irrelevant house where the life of an observer ends. When you lot modify some events close the singularity, it's equally good belatedly for solving anything that matters.
Every damn declaration that Smolin makes is wrong – frequently at a really unproblematic flat – together with everything he says to live relevant for the employment is self-evidently irrelevant, anyway. And vice versa. He just denies together with overlooks everything that is relevant.
"Reader" tries to reply to Smolin 1 time to a greater extent than together with to a greater extent than slowly. He explains that the radiations from a tiny, Planckian object cannot receive got the required huge entropy. Also, 1 must create upwards one's hear whether the interior of the remnant is accessible from exterior inward regulation or not. If it is non accessible fifty-fifty inward principle, together with so the data is really lost. If it is accessible, together with so the precise identity of the remnant represents novel degrees of liberty together with 1 predicts the infinite span production, alongside other things.
Also, "Reader" denounces Ashtekar's comments equally incomprehensible piece Rovelli's comments assume a big departure from GR fifty-fifty when the curved shape invariants are depression – which generically predicts a contradiction with the successful tests of full general relativity, a contradiction that has to live addressed together with contained for the theory to live taken seriously. At the end, he also mentions that AdS/CFT says a clear "No" close remnants. Small objects inward the AdS infinite may live fully classified past times the CFT together with at that spot are just no states that could live identified with the remnants.
You could inward regulation debate that inward the apartment space, the rules of quantum gravity are unlike than they are inward the AdS space. But it's really implausible. The low-curvature AdS infinite behaves just similar the apartment infinite if the laws of locality are preserved. It sounds extremely unconvincing that quantum gravity is made consistent inward 2 or several completely together with qualitatively unlike ways. Moreover, 1 may also verbalise over the apartment infinite using Matrix theory which says the same thing close the remnants equally the AdS/CFT correspondence: They just don't exist.
But because the 2nd side is Lee Smolin, these exchanges are completely meaningless because Smolin non solely denies AdS/CFT or whatever of import tool that is used to analyze the full general questions past times the actual physicists. He also denies unproblematic concepts such equally the entropy together with its basic properties such equally its existence nonzero together with increasing.
Clearly, Smolin's words aren't addressed to actual physicists. They are addressed to completely ignorant laymen who are "capable" of buying that Smolin is equally competent equally other physicists if non to a greater extent than so. And he must for sure live fifty-fifty ameliorate – because he is a far left whacko which is what his target audience likes close a scientist or anybody. And this consummate fraud tin dismiss acquire away with it. What kind of human beings are you, the folks inward Waterloo, if you lot allow your constitute to deceive the whole world inward this way literally for decades if non lifetimes? All of you lot know that what Smolin is doing is a big scam – just similar Andrea Rossi's mutual depression temperature fusion etc. – but you lot must give away it convenient to indirectly collaborate with him.
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