tag:blogger.com,1999:blog-22973357.post1045444488317587639..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Holographic NoiseSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger26125tag:blogger.com,1999:blog-22973357.post-59499140190160400612009-03-16T12:55:00.000-04:002009-03-16T12:55:00.000-04:00I know this thread is getting a bit stale, but I h...I know this thread is getting a bit stale, but I had some questions/comments.<BR/><BR/>First, is there any difference between the concept of "holography" and the Bekenstein entropy bound? Usually I think of "holography" as implying some particular physics on some particular boundary, but this paper seems to make hardly any assumptions about boundary physics, and the derived result doesn't depend Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-17959793695161574862009-03-10T17:50:00.000-04:002009-03-10T17:50:00.000-04:00Hi Mcc,There is nothing special about gravitationa...Hi Mcc,<BR/><BR/>There is nothing special about gravitational waves in this model. It's just that gravitational wave detectors happen to have the right construction details to detect that sort of holographic noise, which is always there and everywhere. It's a far to weak effect to influence dynamics of planets or whatever you had in mind. Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-84119986758235065712009-03-10T17:35:00.000-04:002009-03-10T17:35:00.000-04:00Quick dumb question... if there is "noise" in grav...Quick dumb question... if there is "noise" in gravity waves at large scales, then why does this not have a noticeable effect on the gravitational <I>dynamics</I> at large scales?mcchttps://www.blogger.com/profile/07860791966711083811noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-65545735126714324082009-03-03T13:17:00.000-05:002009-03-03T13:17:00.000-05:00Oops! SorryGo to bottom of this page on Blackhole ...Oops! Sorry<BR/><BR/>Go to bottom of <A HREF="http://www.newscientist.com/article/mg19225751.200-the-elephant-and-the-event-horizon.html?page=3" REL="nofollow" TITLE="The Elephant and the Event Horizon by Amanda Gefter">this page</A> on Blackhole ComputersPlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-84879048893601114712009-03-03T12:55:00.000-05:002009-03-03T12:55:00.000-05:00The Blackhole ComputersHawking radiation owes its ...<A HREF="http://www.newscientistspace.com/article/mg19225751.200-the-elephant-and-the-event-horizon.html" REL="nofollow">The Blackhole Computers</A><BR/><BR/><I>Hawking radiation owes its existence to the weirdness of the quantum world, in which pairs of virtual particles pop up out of empty space, annihilate each other and disappear. Around a black hole, virtual particles and anti-particles can PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-39612184666346435382009-03-03T12:41:00.000-05:002009-03-03T12:41:00.000-05:00The L4 and L5 points lie at 60 degrees ahead of an...<I>The L4 and L5 points lie at 60 degrees ahead of and behind Earth in its orbit as seen from the Sun. Unlike the other <A HREF="http://www.esa.int/esaSC/SEMM17XJD1E_index_0.html" REL="nofollow" TITLE="">Lagrange points</A>, L4 and L5 are resistant to gravitational perturbations. Because of this stability, objects tend to accumulate in these points, such as dust and some asteroid-type objects.<BRPlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-24099765242294782662009-03-03T11:52:00.000-05:002009-03-03T11:52:00.000-05:00Sometimes it is necessary to shake the "rhetorical...Sometimes it is necessary to shake the "rhetorical tree of science" in order for it to enjoy the "continuity of expression of beauty" as some fruit fallen, while it seeks to value the intricateness of complexity and call it a "sight to the bone," of what is at the surface.<BR/><BR/>Neil,<BR/><BR/><A HREF="http://www.nasa.gov/centers/goddard/images/content/96306main_simulation_1aweb.jpg" REL="PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-32994415964166430292009-03-03T07:38:00.000-05:002009-03-03T07:38:00.000-05:00Hi Bee,Of course the other consequence is that eve...Hi Bee,<BR/><BR/>Of course the other consequence is that every section of a hologram is representative of the larger whole, yet with less detail (more course grained). It is then to ask what this limit is as to when the overview is entirely lost and also to ask what information actually represents being when not complete when looked at from the segmental perspective rather then in its entirety.Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-9147660713227117512009-03-03T06:38:00.000-05:002009-03-03T06:38:00.000-05:00Hi Bee,This would seem to suggest that the larger ...Hi Bee,<BR/><BR/>This would seem to suggest that the larger the universe gets so the fussier it will become. We could have in future the projected Planck length the diameter of basket balls. What sort of world would this represent?<BR/><BR/>"I'm waiting for the beauty industry to pick up the idea that the surface tells you everything already ;-)"<BR/><BR/>Yes it would destroy the adage which Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-49665335486001788342009-03-02T20:01:00.000-05:002009-03-02T20:01:00.000-05:00Maybe the holographic concept will link gravity an...Maybe the holographic concept will link gravity and QM but more important: solve the collapse of the wave function. The current use of decoherence as a pretense for solving collapse is pitiful IMHO. Decoherence involves pretending that the mixture definable for a set of multiple cases (like, various runs of an experiment with varying phases each time) can be bastardized onto a given single event Neil Bateshttps://www.blogger.com/profile/04564859009749481136noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-66462194462864138932009-03-02T18:08:00.000-05:002009-03-02T18:08:00.000-05:00The actual detectors are not sensitive to the Unru...The actual detectors are not sensitive to the Unruh effect because they are not in a freely falling geodesic; however the light particles themselves are freely falling near to the Rindler horizon of the gravitational acceleration (the light cannot be accelerated to higher velocities), and so would scatter off a thermal background whose temperature is proportional to the component of gravitationalAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-52340239153262786262009-03-02T17:26:00.000-05:002009-03-02T17:26:00.000-05:00Hi Aaron,Regarding Unruh effect: what is accelerat...Hi Aaron,<BR/><BR/>Regarding Unruh effect: what is accelerated in an interferometer? I don't quite get it. Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-56240859688617334752009-03-02T17:25:00.000-05:002009-03-02T17:25:00.000-05:00Hi Phil,Well, one can get very philosophical about...Hi Phil,<BR/><BR/>Well, one can get very philosophical about that, but one way to think about it is that we are subject to the illusion of having more possibilities than it is the case. I'm waiting for the beauty industry to pick up the idea that the surface tells you everything already ;-) Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-57668218654236792332009-03-02T17:20:00.000-05:002009-03-02T17:20:00.000-05:00Hi Thomas,Thanks for the info, I have added an upd...Hi Thomas,<BR/><BR/>Thanks for the info, I have added an update. Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20150964709036636732009-03-02T17:10:00.000-05:002009-03-02T17:10:00.000-05:00Hi Peter,I'm not sure what you mean with 'removing...Hi Peter,<BR/><BR/>I'm not sure what you mean with 'removing' the volume. Are you talking about the static case? Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-7608350704950936752009-03-02T16:33:00.000-05:002009-03-02T16:33:00.000-05:00Peter,Interesting that you should point out Stokes...Peter,<BR/><BR/>Interesting that you should point out Stokes Theorem. It was Stokes Theorem (the solutions to a differential form in a volume are enumerated by their boundary values) that initial was used to argue that black holes don't have entropy (they have a unique state).<BR/><BR/>The reason was that the Einstein Field Equations are a differential form, whose solutions are specified by the Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-72632155157573666332009-03-02T15:20:00.000-05:002009-03-02T15:20:00.000-05:00Isn't this principle"The Holographic Principle is ...Isn't this principle<BR/><BR/>"The Holographic Principle is the conjecture that all the information about a volume of spacetime is actually encoded on its surface."<BR/><BR/>also true for other field theories ?<BR/><BR/>I'm not a physicist but I am aware<BR/>that in linear field theories, e.g., electromagnetism, you can<BR/>remove a volume if you know the tangential fields on the boundary of thisAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-56198843434170853262009-03-02T13:09:00.000-05:002009-03-02T13:09:00.000-05:00Wouldn't the Unruh effect make a better prediction...Wouldn't the Unruh effect make a better prediction of noise in gravitational interferometry? So that one would find a thermal spectrum of noise due to the acceleration. Now the really clever thing would be to look for diurnal oscillations in the thermal noise spectrum corresponding to axis change with respect to the sun.<BR/><BR/>Of course I'm just a crack-pot so what do I know anyway?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-11424807532760051962009-03-02T11:40:00.000-05:002009-03-02T11:40:00.000-05:00Uncle Al,You should look at the analogy of the wat...Uncle Al,<BR/><BR/>You should look at the analogy of the waterfall....False vacuum to the true? Energy topology?:)<BR/><BR/>You look then at the "sound of" billiard balls in new ways.:)<BR/><BR/>BestPlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47714440558496840982009-03-02T10:54:00.000-05:002009-03-02T10:54:00.000-05:00Ununderstanding Lovely! All discovery is insubor...<I>Ununderstanding</I> Lovely! All discovery is insubordination. Yang and Lee made a mockery of deep symmetries dictating all observation. Theory predicts what it is told to predict.<BR/> <BR/>Lorentz invariance is <I>not</I> tighty constrained. Massless EM is hugely tested to extradordinary sensitivity. Massed sector violations remain untested. Physics is achiral by postulate and Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20148245922188258722009-03-02T10:14:00.000-05:002009-03-02T10:14:00.000-05:00It's not clear to me exactly when Hogan found out ...It's not clear to me exactly when Hogan found out that GEO 600 had unexplained noise in the few-hundred Hz range. <BR/><BR/>The New Scientist article implies that he was "in the dark" until last June - when he sent his prediction to the experimentalists and got back a noise spectrum that matched it perfectly.<BR/><BR/>But he already referred in March 2008 (latest arxiv version of 0712.3419) to anAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-7845740436262079782009-03-02T10:06:00.000-05:002009-03-02T10:06:00.000-05:00As you said Bee, I am the new Bacon( Shakespeare)....As you said Bee, I am the new Bacon( Shakespeare). If we are the builders, then what is nature? :)If it doesn't make sense now, it will.<BR/><BR/><A HREF="http://eskesthai.blogspot.com/2009/01/whole-world-is-stage.html" REL="nofollow" TITLE="The Whole World is a Stage-Friday, January 02, 2009">All The World's A Stage</A> by William Shakespeare<BR/>From: As you Like It, <A HREF="http://PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45371731804173700792009-03-02T09:56:00.000-05:002009-03-02T09:56:00.000-05:00"Dyson, one of the most highly-regarded scientists...<I>"Dyson, one of the most highly-regarded scientists of his time, poignantly informed the young man that his findings into the distribution of prime numbers corresponded with the spacing and distribution of energy levels of a higher-ordered quantum state." Mathematics Problem That Remains Elusive—And Beautiful By Raymond Petersen</I><BR/><BR/>If one is able to direct their attention to the idea PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-15353511385853486202009-03-02T08:27:00.000-05:002009-03-02T08:27:00.000-05:00Thanks, Bee, for the summary and for reporting on ...Thanks, Bee, for the summary and for reporting on your exchange with Hogan! I presently have nothing to add, but will download the papers.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-52513795943835213492009-03-02T06:59:00.000-05:002009-03-02T06:59:00.000-05:00Hi Bee,A nice article which discusses a current pr...Hi Bee,<BR/><BR/>A nice article which discusses a current proposal in physics which I must admit I certainly find difficult to grasp. To consider everything we recognize as being real as a projection that originates and resident at the boundaries of our universe gives ones mind more then a single twist. The worst of it for me is it seems to generate more questions then it provides answers. <BRPhil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.com