Talk:Holographic principle
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Can we turn off the holograpic princible? Is it information imprinted on to a flat surface or is it information in an energy format, if so is it possible to turn that energy off?
I just had an interesting thought that I think could help a person grasp the holographic principle. Try to visualize 3-space as a gigantic sierpinski sponge (for those who aren't familiar with it: http://mathworld.wolfram.com/Tetrix.html ). The object *looks* 3-dimensional, but if you calculate its dimensionality, it's 2-dimensional. Also, it's worth noting that the little pyramids a sierpinski sponge is made of have 4 sides...analogous to the way a bit of information is encoded on 4 planck areas. Maybe it's just a coincidence, but I'd love to hear a physicist's take on this. - Waylon Rowley
The holographic principle is rather unintuitive, but I think I can picture it, if denser mass makes space more hyperbolic. Mind you, I don't really understand curved space very well yet. But in hyperbolic space, I believe the center of a volume is supposed to be closer to it's surface than in euclidian space. So as the mass gets denser, the center aproaches the surface. When it reaches critical density, the center *reaches* the surface (VERY unintuitive), and it becomes a black hole. Is this at all logical? Does dense mass make space hyperbolic? I know mass is supposed to bend space, but I don't know which way, positive (ball) or negative (hyperbolic), or some combination.
Is this idea restricted to dimension 3? No. It is concretely realized in the AdS/CFT correspondence which is actually a higher dimensional correspondence. It is a relation between gravity in D dimensions and field theory in D-1.
Why does information inherently carry mass? Nobody knows. If information would ever be proven not to carry mass, it would be a problem for the correspondence.
An infinite collection of zero energy photons weighs nothing. On the other hand, it doesn't carry any information, because they are not localized. If you think of photons in a box, the minimum wavelength of a photon is the length of the box (well, twice the length of the box), which means that the photon has a minimum energy. It turns out that photons in a box seem to conspire in just such a way to preserve the holographic principle, but nobody really knows a deep reason why.
I think the holographic principle can be formulated seperately from these entropy bounds, but they are logically connected, because you need the entropy bounds to remove degrees of freedom from the gravity theory: that's how you lose a dimension, because the vast majority of states in the field theory are not accessible, as they would form black holes.
This is an article I would really like to expand, but I don't have the time at present. The review article by Bousso is great, but technical. –Joke137 18:46, 20 July 2005 (UTC)[reply]
For the first question, I don't understand much of what you're saying about profinite fields, etc, but the basic argument is in the Bousso article, II.C.3. It turns out that for a gas of radiation, the so-called Bekenstein entropy bound is closer to being saturated for smaller boxes. The review says that the bound isn't particularly well defined, and proposes an alternate bound, called the covariant entropy bound. As for AdS/CFT, I think it is normally realized on (although the S5 could be any compact five dimensional manifold and really it could be ), and the boundary looks like , where is for Minkowski. If you object that anti-de Sitter space doesn't have a boundary, well, it's the conformal boundary. –Joke137 23:49, 20 July 2005 (UTC)[reply]
I'm having trouble reconciling a pair of statements. The author starts the paragraph with: "Black holes become more disordered as they absorb matter." Then the author ends the paragraph with "Black holes are thus the most disordered objects in the Universe." These two statements seem to contradict each-other.--Paul 21:30, September 11, 2005 (UTC)
I think references [1], ... in article don't work, is that correct?
Currently the article is almost entirely about black holes and the Bekenstein bound, but the essence of what physicists mean by the "holographic principle" goes beyond this, and says that the dynamics inside any volume should be understandable in terms of the boundary of that region or some corresponding region in a space with a different number of dimensions. As I understand it, the key piece of evidence for this is the finding in string theory that there is an exact equivalence between the dynamics predicted by string theory in a region of 5D anti-deSitter spacetime, and the dynamics predicted by ordinary quantum field theory on the 4D boundary of this region (the CFT stands for 'conformal field theory', which I gather is a specific class of quantum field theory). For a good layman's explanation of this stuff, see the Scientific American article by Bekenstein that I added to the external links section.
Without this sort of generalization, it seems like the holographic principle would be nothing more than a synonym for the Bekenstein bound, and most of the article at present is just duplicating stuff already seen in the Bekenstein bound article. If nothing else, the article at least needs to make it clear that the holographic principle is a hypothesis which goes beyond just talking about the boundaries of black holes. Hypnosifl 20:34, 2 December 2006 (UTC)[reply]
That link has a crackpot article about LSD research, past lives, and psychic claims that was just slapped on the end without notice of any kind. It would seem that a supporter of this latter essay used the credibility of Scientific American parasitically. The link I put in its place lacks a few sentences at the beginning, but seems to have all the rest. Scientific American article [New York] 12:40, August 13, 2007]
I removed a statement saying that the bound of entropy in space is Bek. Bound. The Bekenstein bound - which is a bit controversial - is something else, a bound on the entropy of an obect of a given size AND energy. S<A/4 is now part of the Covariant Entropy Bound (aka Bousso Bound).PhysPhD 22:33, 17 April 2007 (UTC)[reply]
"One bit equals 2 nats" is false and must be fixed.
This reads as a great science article and as a lay person with some grasp of physics, it makes no sense to me. I would encourage knowledgable people to re-write it so that it as encyclopedia article- accesible to everyone. Sethie 16:45, 13 August 2007 (UTC)[reply]
Hi, I am adding this comment here as the title is just "feedback".
In the following statement the example seems to be anachronistic. As I understand, from the paragraph before the mentioned line, Shannon wrote the theory in the 1940´s and as you read the line below it is somehow implied that he was thinking in the quantity of the information that an email message carries when he must probably was thinking on letters or telegraphic messages.
"Shannon's efforts to find a way to quantify the information contained in, for example, an e-mail message, led him unexpectedly to a formula with the same form as Boltzmann's"
From an encyclopedic point of view this is misleading, as an analogy or example it will need to be rewritten to avoid the idea that Shannon was sending emails on 1948. Editions that may work:
"Shannon's efforts to find a way to quantify the information contained in, for example a letter, led him unexpectedly to a formula with the same form as Boltzmann's"
or
"Shannon's efforts to find a way to quantify the information contained in, for example in modern times e-mail messages, led him unexpectedly to a formula with the same form as Boltzmann's" — Preceding unsigned comment added by Mauvarca (talk • contribs) 05:16, 7 July 2012 (UTC)[reply]
I agree that the example is anachronistic and ahistorical, clearly. My understanding is that Shannon was working with encoding communications signals (historically relevant examples are Morse Code, FM and AM signals). I don't see any reason to dumb down the article to the point at which it becomes silly. Its like using GPS satellites as an "example" of what Einstein was working on 100 years ago.Abitslow (talk) 22:34, 1 March 2015 (UTC)[reply]
Yo dawgs: it seems as though the strong and weak forms of the principle have been swapped! But I don't really know for sure. It just seems that way. CKL this signed entry was misinterpreted as unsigned by some bot several hours after everyone stopped caring
I would like to suggest adding a book to the references: "The Black Hole War: My Battle with Stephen Hawking to Make the World Safe for Quantum Mechanics“ by Leonard Susskind. This book gives a good overview and history by one authors of this priciple. —Preceding unsigned comment added by Leifshu (talk • contribs) 17:01, 17 August 2008 (UTC)[reply]
http://www.newscientist.com/article/mg20126911.300-our-world-may-be-a-giant-hologram.html?full=true --Wongba (talk) 18:55, 15 January 2009 (UTC)[reply]
The connection of space-time "graininess" far above the Planck-scale, if I understand it correctly, is a forehead-slappingly obvious conclusion from this, it's just that nobody ever thought of it before. I suggest a reference to the GEO600 "noise-story" be added to this article. --dab (𒁳) 19:09, 24 January 2009 (UTC)[reply]
as an afterthought, there may be a new eschatology in this: the supposed "blur level" at 1E-16 m is disconcertingly close to the atomic scale. What if the universe expands any further, and the blur should rise to above atomic level? Will the universe die a "blur-out" death of being eaten up from the inside? Death by out-of-memory error, so to speak? --dab (𒁳) 19:56, 24 January 2009 (UTC)[reply]
I do not understand your conclusion of "there is more information per particle as the universe expands" as a consequence of any of this. My understanding of this is that information scales with the sphere surface, not the sphere volume, and since the surface will scale more slowly than the volume (no matter how many dimensions you are looking at specifically), information density in the volume will decrease if you assume information density on the surface remain constant. The rest is a back-of-the-envelope calculation assuming that the "graininess" on the surface is limited by the Planck scale. --dab (𒁳) 13:16, 25 January 2009 (UTC)[reply]
Furthermore, Planck Units are the smallest observable units, just within the explanation by relativity and just outside the need for quantum mechanics. EnemyTortoise15 (talk) 05:23, 01 May 2017
This is a great reference, and it should be mentioned, and I haven't read it all yet. But my first impression after a cursory glance is that it is not completely fair to claim full priority for the earlier authors for the matrix formulation. But its unbelievable that they got so close so early, and they should definitely be mentioned.
The question is the physical interpretation. In the earlier paper, there's an interpretation that a certain large N limit of the matrix model will reproduce the membrane dynamics. I don't think you can say that this includes the holographic principle implicitly, although it might. It is motivated by string expansion, and this expansion contains some stunted version of holography inside, so it's hard to say "no this isn't holography" or "yes this holography" for sure.
The motivation is discrete chopping up of the M2 brane to get a good quantization, which does not give confidence that the matrix formulation will include the fivebranes and gravitons as well (but maybe the original authors understood it better). You could only be sure that everything is included by the holographic principle and by having a good black hole interpretation for the objects that are carrying the matrices around. That essential physical insight, that the D0 branes can serve as the "string bits" (or "membrane bits" in this case), came in 1995 from BFSS, immediately following Witten's famous analysis of D0 brane spectrum in IIA, and the D0-brane action was a reduction of more complicated D-brane actions in a light-cone way that has a physical interpretation which allows you to be sure that you can really reconstruct all the objects from the large N matrix model, and that the finite N part is also physical, not just the limit. This is exactly AdS/CFT, but a little earlier.
I have to admit that the BFSS paper seemed like magic to me. I couldn't understand how something like that could ever have been dreamed up. This earlier reference helps a lot to understand how this type of magic works. So maybe it should read "following an approach pioneered in early work of deWit Hoppe and Nicolai, BFSS were able to intepret the matrix models proposed by the earlier authors as holographic actions for a physical black hole type in string theory and thereby give the first arguments that these form a complete nonperturbative formulation of M-theory."
There's also the discrete string-bit approaches, which led to other matrix models in low dimensions. Maybe these should be mentioned as precursors too.Likebox (talk) 20:34, 20 May 2009 (UTC)[reply]
The best reference for 'tHooft's ideas in a form closest to string theory is the stuff he did in the 80s regarding the black hole S-matrix and the deformation of the horizon for an infalling particle. One of these papers is reprinted in "Under the Spell of the Gauge Principle", and another is in some issue of Nuclear Physics B. The Nuclear Physics B article is better than the 1993 article, in my opinion, because it includes the "imaginary action" string action for radial black hole deformations from the analysis of small body impacts. While this is not precisely modern, its probably slightly wrong in details because the black hole is thermal, its close enough that the modern picture can be deduced from it. I don't know whether there is a good freely available link to these classic papers.Likebox (talk) 18:47, 27 May 2009 (UTC)[reply]
The current text suggests that Bekenstein's result of black-hole entropy being proportional to area (which, by the way, if true, then holds independently of the units chosen, Planck areas or ploughgates) was derived from an upper bound on the entropy in a region of space, and that this was published in:
{{cite journal}}
: Unknown parameter |month=
ignored (help)CS1 maint: date and year (link).However, this publication assumes the Bekenstein–Hawking formula S = A/4 for black-hole entropy to be known. Bekenstein introduced the concept of black-hole entropy as the measure of information about a black-hole interior which is inaccessible to an exterior observer and derived S ∝ A already in:
{{cite journal}}
: Unknown parameter |month=
ignored (help).I'm not sufficiently familiar with the physics to confidently make the requisite changes myself; in particular, I'm not sure I've fully grasped the relevance of this material for the holographic principle. --Lambiam 18:29, 11 September 2009 (UTC)[reply]
Would the Holographic Universe be an explanation for quantum entanglement? It strikes me rather simplistically that items can interact at a distance if they are really not at a distance, but only appear to be so - e.g. the location of the 'emitter' is given, the emitted particles appear to diverge, but in the "superbrane" they do not diverge until they are disturbed on a "superbrane" level. Until that point it should appear to us that finding state A of one "causes" the other to take on state B, while in reality you have simply pulled A out of an invisible bag meaning that B must remain. Could someone comment?158.143.136.205 (talk) 14:45, 29 October 2009 (UTC)[reply]
See some of the (mostly rejected) work of David Bohm - http://en.wikipedia.org/wiki/Implicate_and_explicate_order_according_to_David_BohmRegardless of how deeply the original mistakes and misinterpretations in the creation of the theory may or may not cut into its conclusions, I find it quite an interesting read! Also quite interesting is the very different verbal attitude and points of view on this article, in comparison to the article on Bohm's Holographic_paradigm--80.6.149.158 (talk) 14:42, 21 March 2010 (UTC)[reply]
In this article it says that the holographic principle implies that "volume is illusory". Wouldn't it be more accurate to say that space becomes emergent, so that space is illusory? (or at least, not fundamental) I really don't think I understand this stuff, but it doesn't seem to jive on a conceptual level with what I've read before. Danski14(talk) 22:32, 8 September 2010 (UTC)[reply]
There is a fundamental flaw, possibly, in this interpretation of the relation between entropy and information. It is said that the entropy is proportional to the amount of information. However, the Shannon information is a measure of the amount of information MISSING in a message = uncertainty.This would imply that the amount of information (in the form of bits or nats) on the screen is actually decreasing (lost) as time evolves and the entropy increases, not the other way around. —Preceding unsigned comment added by 217.128.46.38 (talk) 18:00, 16 November 2010 (UTC) Magnaquantum (talk) 12:14, 20 November 2010 (UTC)[reply]
Well, something may escape me, quite likely, but I still argue that this interpretation that an increase in information leads equally to an increase in Entropy is flawed.Take the example of a colour photograph, a picture, the old fashion argental one.It contains billions of “pixels” and the amount of information on it is very big indeed.Now, place the photograph outside, exposed to the elements. The rays of the sun will bleach the colours and rain and wear erodes the picture and with time it will become increasingly difficult to see what the picture originally looked like. The information is lost.Simultaneously, the Entropy increases = proportional to the now missing information (according to some algorithm).The same should be true to a holographic picture or screen, wherever it may reside.Magnaquantum (talk) 12:35, 22 November 2010 (UTC)[reply]
Hello again- this is getting more interesting by the minute.First, the question of whether information exists also without me, a human (or any other so called conscious receiver) is indeed a philosophical question, which merits a separate discussion.Second, we are in full agreement that, according thermodynamic entropy concept, entropy is proportional to the number of degrees of freedom, or, with your terminology, number of arrangements of “microstates”..Just to make things clear, a given surface (our picture) can harbour only a given number of “atoms”, Plank lengths or pixels or whatever discrete unit we decide to use. The number of positions of these is constant, regardless of in what order they are arranged. For the arrangements to have an effect on entropy, it would be required that we study one specific arrangement, i.e. the original one, which gave us an image, containing the information. When the image deteriorates, the “atoms” or pixels change position, whilst leaving the total number of positions unchanged, whereas the information is corroded and the Information Entropy increases.In this respect, I fail to see that Entropy = amount of Information (the more Information-the more Entropy). On the contrary. It is the other way around. Entropy = Uncertainty. Thus S= lack of Information of the nature of the original “message”.Lastly, your arguments seems to indicate that the amount of information, over which information is lost or missing, is increasing.Magnaquantum (talk) 16:01, 26 November 2010 (UTC)Magnaquantum (talk) 06:43, 27 November 2010 (UTC)[reply]
In its context in the article, the above reads like a statement of known fact. Is this actually the case, or is it really just an unproven claim of the theory? 86.183.171.111 (talk) 23:04, 3 February 2011 (UTC)[reply]
"That volume itself is illusory and the universe is really a hologram which is isomorphic to the information "inscribed" on the surface of its boundary"
Yes, in fact, we call this a shape and the Latin etymology of the word information means shaping or creating a shape.
We remark, indeed, at the quantum level, the macroscopic volume is an illusion; emptiness is the only true reality. Even universes composed of compact balls attached to each other obey to the holographic principle.
The introduction of the concept of "information" into physics is revolutionary but the shape... it has always existed in front of all physicists.
It's like the color of the wings of flies that remained hidden for 300 years just because we looked them on white cards... We had to watch them on black cards...or a black hole.
--Nipou (d) French Wiki — Preceding unsigned comment added by 96.20.8.46 (talk) 21:25, 19 June 2011 (UTC)[reply]
The great unification will be between theory of computability and physics. The mass is the amount of information stored in the space while energy is the potential for achieving deterministic phenomena (potential of calculation). Their strict equivalence is simply the consequence of the fact that there is equivalence between information (product of a deterministic phenomenon) and computational complexity (in the sense of Kolmogorov). The shape (equivalent to the mass) is simply the means by which the universe store information in space. Every phenomenon on the mass (inertia and gravitation) is, by logical consequence, the result of the constraints of representation of information in space. - Nipou (d) French Wiki October 15, 2011 at 17:28 (CEST)
Thus the sphere is the level zero of shape, any injection of energy absorbed by this sphere will be transformed into shape. For example, one mole of spherical metal is not the same mass that this same mole representing a Michelangelo statue (small variation in the level of mechanical energy). This variation of mass is also proportional to the algorithm of Kolmogorov complexity necessary to achieve this formatting- Nipou (d) French Wiki October 15, 2011
Question: The limit to the density of information does not give us a formal limit to the largest buildable Schrödinger's cat? It would thus be a constraint on quantum entanglement.
--Nipou (d) French Wiki — Preceding unsigned comment added by 96.20.8.46 (talk) 21:33, 19 June 2011 (UTC)[reply]
I'm only a maths & theoretical physics undergrad, so I have no in-depth knowledge on this topic. I noticed the section Limit on information density says: “The holographic principle thus implies that the subdivisions must stop at some level, and that the fundamental particle is a bit (1 or 0) of information.”. Should this be qubit instead of bit? Wouldn't a quantum theory of thermodynamics presumably use qubits instead of bits? IMHO the use of "bit" in this context seems to me at odds with quantum mechanics and quantum information theory, which are surely essential to any fundamental description of reality, especially of the sort described in the above quote.
On a separate note, I wonder whether the more scientific terms "embedded" or "encoded" (the latter's used elsewhere in the article) might be more appropriate than the rather poetic terms "painted" and "inscribed" that the article occasionally uses: i.e. “the entire universe can be seen as a two-dimensional information structure "painted" on the cosmological horizon” and “the universe is really a hologram which is isomorphic to the information "inscribed" on the surface of its boundary”. IMHO it would also make the article more consistent in its use of terms as well as sounding more encyclopedic.
Anyway, just my two cents. Annoyamouse (talk) 20:45, 2 December 2011 (UTC)[reply]
Equations are written on, like, paper and stuff. 192.139.122.42 (talk) 22:41, 24 October 2012 (UTC)[reply]
I've recently edited this article, because of the undue weight given to Craig Hogan's claims. It is not justifiable to associate Hogan's claims with the whole holographic principle. If we leave aside the one self-cite and the 4 cites by experiments, this paper has earned exactly two citations since 2009, neither of which lend any credence to the idea that Hogan's idea is relevant to the whole holographic principle. In particular it doesn't seem to have anything to do with string theory, which makes the relevance of his claims for this page especially doubtful. Isocliff (talk) 18:50, 8 April 2013 (UTC)[reply]
Greetings, I find this fascinating. Apparently two papers came out in Japan recently which lend some mathematical plausibility to this theory. Someone smarter than me would have to do the heavy lifting of integrating the information into this page:http://www.nature.com/news/simulations-back-up-theory-that-universe-is-a-hologram-1.14328Thanks! Joel J. Rane (talk) 10:00, 13 December 2013 (UTC)[reply]
I question the wisdom of using "Recent" as a section title. It isn't a very good idea, unless this page is being frequently monitored and updated. What was recent in 2014 is going be NOT recent in a couple of years. I also question the relevance of the information in the section. A computer model of a Universe which isn't our Universe is hardly evidence AND CERTAINLY NOT EVIDENCE OF WHAT IS "TRUE"!! I'm out of my depth here, but our Universe is NOT AdS/CFT, is it? (I just read that Wikipedia article, which makes that very clear.) Somebody apparently believes that if the "right" result is obtained from a "toy model", then we can quote it as evidence. Rubbish. I don't see how it is even suggestive, since the holographic principle must at least be nearly as consistent as the theory (and speculations) used to obtain it in the first place, right? Starting with it, and modeling a toy Universe, is hardly meaningful. (Not saying it isn't worthwhile, but only to advance THE EXPERTS understanding. It doesn't significanly add to what we know. I think its counting angels dancing on the head of a pin: only of interest to fanboys and experts.)Abitslow (talk) 23:49, 1 March 2015 (UTC)[reply]
The categorization of the article, and the introduction, talk a lot about string theory, as though the most important thing in the article is the relationship of the ideas to string theory. The rest of the article seems to say nothing at all about string theory. It looks like the results may be independent of string theory. If so then Occam's Razor tells us we should simplify by removing string theory from the central discussion. String theory could be perhaps referenced as a footnote to the article - nothing more. — Preceding unsigned comment added by 54.240.196.169 (talk) 08:15, 28 April 2015 (UTC)[reply]
As implied in the "see also" link, which suggests some relation, not just things editors happen to like, like, "see also: kittens". I don't know much about physics and whatnot, but as far as I know the holographic principle is not a "requirement" nor something that hints particularly more at the hypothesis that the universe is a simulation, than somehow "falsifying" the principle, or the non-instrumentalist interpretation, if it makes sense. To me it seems that the connection stems mainly from the notion that most known holograms are man-made things, so it's not that much different than just pointing at "physical laws" as a connection to the simulation hypothesis and vice-versa, since "laws" are man-made things. It just happens that we're more used now to the concept of natural/intrinsic "physical laws", without implying in creationism. The inter-link is also on the simulation hypothesis article. That and perhaps the term "matrix" and the movie with the same name. At a quick control+f scan, the inter-links are the only mentions of the linked concept in each article.
The comment(s) below were originally left at Talk:Holographic principle/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
It seems to me that if indeed the Holographic principle is a candidate for, or is an underlying basis of a "Theory of Everything", that it's importance should perhaps be "high" as opposed to "mid".Just curious about other opinions. WNDL42 (talk) 12:55, 17 March 2008 (UTC)[reply] |
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Here is the start of the second paragraph of the article. This sentence seems illogical to me. Can someone who knows what this is supposed to mean break it down in some way please?
"In a larger sense, the theory suggests that the entire universe can be seen as two-dimensional information on the cosmological horizon, the event horizon from which information may still be gathered and not lost due to the natural limitations of spacetime supporting a black hole, an observer and a given setting of these specific elements,[clarification needed] such that the three dimensions we observe are an effective description only at macroscopic scales and at low energies." — Preceding unsigned comment added by 82.72.139.164 (talk) 03:31, 20 June 2017 (UTC)[reply]
Some have tried to create pixelated Bloch-like spheres, wired with many others - this requires a humongous amount of all possible connections; also that generates quantization noise, because the actual Bloch spheres aren't pixelated.
As pointed out by Raphael Bousso, Thorn observed in 1978 that string theory admits a lower-dimensional description in which gravity emerges from it in what would now be called a holographic way.
Wearing my linguistic hat for a moment, the scope of this modifier is ambiguous. It could apply to the proposition that Thorn observed something in 1978 (or that Thorn observed something, not necessarily in 1978) or it could apply to how "string theory admits" or merely to the "lower-dimensional description" on its own terms, without necessarily going so far as to posit that "string theory admits" this.
Sentence modifiers do so love impersonating lazy, hazy writing. Furthermore, it glides unctuously over such details as when Bousso pointed this out, and to whom, and if he pointed it out to anyone important, as something thought to be important at the time, why he's now being tucked into this sentence as a murky afterthought. — MaxEnt 14:40, 16 December 2018 (UTC)[reply]
The information is not in both the 2D black hole sphere and the interior of the black hole.
It is in superposition and decides where to be materialized/reified/objectified after the measurement.
Measurement is to hit stuff with stuff; so natural "measurements" occur, because true black holes are hairy/imperfect and turbulent.
The higher the energy pressure, the more likely it gets to detect the particle moving afar from the holographic horizon it belonged. For a black hole the pressure is at the maximum. The "measured" particle appears as afar from the horizon as the energy of the measuring/hitting particle was. To measure = to be someone and to hit someone else. (Thus almost no particle becomes reified exactly at the horizon, because energies of measuring thrashers is usually high..... That's an issue. According to the standard view, no particle can ever reach an abolute zero energy when it acts a thrashing measurer of other particles in a black hole, so we have an eternal back and forward motion of particles which bounce off the black hole and immediately re-enter because all paths lead to the black hole... almost all, 99,999999...% with some Hawking radiation escaping. Actual black holes aren't as perfect as taught in universities.)
— Preceding unsigned comment added by 2a02:587:4111:8300:6c10:9423:59d1:91bc (talk) 09:14, 11 April 2019 (UTC)[reply]
It's constituents:
— Preceding unsigned comment added by 2a02:587:4123:6d00:6c10:9423:59d1:91bc (talk) 09:29, 11 April 2019 (UTC)[reply]
A system's lowers possible informational density is extremely crucial. If you try to delete or spread afar information at a very fast pace, the whole system explodes. Big Bang causality is linked to that. — Preceding unsigned comment added by 2A02:587:4102:B000:DC36:6B05:57BD:8DE7 (talk) 15:23, 26 April 2019 (UTC)[reply]
Travel to India; discuss to the professors and add here the link.
the Indian Institute of Science will do, but ask more professors
This comment is based on (it is about) the current version (that is, the "Latest revision as of 03:05, 25 February 2020" version) of the article.
In that version of the article, the last sentence before the beginning of the section of the article called "The AdS/CFT correspondence" says, (in part):
The existence of such solutions conflicts with [...] and their effects in [...] including the holographic principle are not fully understood yet.[5]
I may not I do not understand most of the science that this article is about.
I do not understand all of that science, even when considering "only" those parts that are "fully understood" -- (by some person[s]) -- as of today. (Actually, I probably understand little or none of it).
However, I do understand that footnote number "[5]" -- shown in square brackets at the end of the above quoted [partial] excerpt -- references a reliable source that is over a decade old. The word "yet" in that excerpt probably means either
OR
Either way, the meaning of that word ("yet") is not (necessarily) as of when the reader is reading the sentence that contains that word.
It is (more like) as of some time in the past.
Hence, I suggest that the sentence should be changed, to specify either [a] or [b].
(probably "[b]" ... right?)
That could be done (e.g.) by inserting a parenthetical phrase, such as << (at least, as of 2009) >>, right before the words "not fully understood yet" in that sentence. Thus, the sentence would read something like this:
The existence of such solutions conflicts with [...] and their effects in [...] including the holographic principle are (at least, as of 2009) not fully understood yet.[5]
It might also be appropriate to change the word "are" to use the past tense ("were") instead. Maybe that could be done via a separate edit.
Do you agree? --Mike Schwartz (talk) 08:40, 30 March 2020 (UTC)[reply]
Not sure so posted. Are physics articles from WP allowed?Is the book by M Talbot, mentioned the work of David Bohm and one other physicist. RetrievedJuice23 (talk) 11:16, 24 May 2021 (UTC)[reply]
“The three-dimensional world of ordinary experience––the universe filled with galaxies, stars, planets, houses, boulders, and people––is a hologram, an image of reality cited on a distant two-dimensional (2D) surface."
The word "cited" here feels wrong (or at least very odd), and indeed the majority of Google results (152 to 101) suggest the actual word used was "coded" rather than "cited", with the rest of the quote identical, suggesting that someone got it wrong somewhere (perhaps the book referenced) and people have been propagating the error ever since. 2601:245:4100:B781:D003:DE1:31E6:5F88 (talk) 02:02, 15 May 2022 (UTC)[reply]