tag:blogger.com,1999:blog-5237654928835551390.post6457389562022727587..comments2023-03-28T15:27:45.192+01:00Comments on Physics Satire About the Theory of Everything: The ups and downs of entropic gravityClara, once known as Nemohttp://www.blogger.com/profile/15931393389874902234noreply@blogger.comBlogger16125tag:blogger.com,1999:blog-5237654928835551390.post-70329913533999970322013-02-15T12:47:13.070+00:002013-02-15T12:47:13.070+00:00Sadly, your last comment is often true.Sadly, your last comment is often true.Clara, once known as Nemohttps://www.blogger.com/profile/15931393389874902234noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-41030867507662447182013-02-12T10:47:17.329+00:002013-02-12T10:47:17.329+00:00The weird thing about the Kobakhidze article is th...The weird thing about the Kobakhidze article is that it is so fundamentally flawed that a high school physics teacher should be able to tell what's wrong with its assumptions... and if a first semester physics student couldn't tell in a couple of minutes why the claimed decoherence effect would not be measurable with current cryogenics experiments on ultra-cold neutrons, even if it existed, I would send him to the liberal arts department, because he/she will clearly not make a career out of physics. <br /><br />One can only conclude that publishing in PRD is not worth a dime these days, the reviewers are clearly sleeping while reviewing papers. <br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-24691029282367429522011-07-19T04:35:58.474+01:002011-07-19T04:35:58.474+01:00Dear Anonymous,
nonsense is nonsense, even if pe...Dear Anonymous, <br /><br />nonsense is nonsense, even if peer-reviewed. In physics truth is determined by facts, not by peer-reviewing. My own education also has nothing to do with whether this is true or false.<br /><br />You sound as if you were a frustrated man who believes more in authority than in facts. In fact, you sound like the author of that paper. Be happy that you were able to screw the system in getting nonsense into PRD - it remains nonsense nevertheless.<br /><br />Like many journals, also PRD publishes nonsense from time to time. If you think that "being in PRD" is a reason that I or others should conclude that an idea is true, then your place is not in physics research, but in an asylum.Clara, once known as Nemohttps://www.blogger.com/profile/15931393389874902234noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-70751862195652003302011-07-19T01:24:28.309+01:002011-07-19T01:24:28.309+01:00Dear Clara, alias Nemo,
What did you find so non...Dear Clara, alias Nemo, <br /><br />What did you find so nonsensical in that quote? Before criticizing someone I would kindly suggest to educate yourself at least at the level of Wikipedia.<br /><br />The paper is published in one of the leading physics journal and obviously went through the referring process. Be more rational and a little bit more humble in expressing your views.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-75120416538606356342011-06-28T08:08:03.885+01:002011-06-28T08:08:03.885+01:00The paper you mention is pure nonsense. I quote:
...The paper you mention is pure nonsense. I quote: <br /><br />"Thus, if E. Verlinde’s idea is correct, the neutrons would have to travel through the slit without substantial losses even if λ < h <<< z1."<br /><br />The author was obviously drunk when he wrote this. <br /><br />It is not clear why you feel as you do, but you are free to feel as you like. Physics is not about feelings, and even less about *your* feelings. <br /><br />Here we have a male physicist that uses feelings as an argument! The way you write you are neither a male nor a physicist.Clara, once known as Nemohttps://www.blogger.com/profile/15931393389874902234noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-39503926707090479742011-06-28T02:52:20.922+01:002011-06-28T02:52:20.922+01:00Dear Nemo, you are totally confused - any classica...Dear Nemo, you are totally confused - any classical configuration (such as black hole) carry entropy, but that does not mean that entropic phenomena are fundamental. For example, a bunch of charged particles carry entropy, but at fundamental level the dynamics of charged particles is govern by quantum electrodynamics. <br /><br />Feel free to believe that also electromagnetism (and perhaps everything else)is entropic, but then I am sorry for you.<br /><br />P.S. This paper http://prd.aps.org/abstract/PRD/v83/i2/e021502 shows that Verlinde's idea is wrong. If you are familiar with basics of QM you will be able to understand why.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-60440292120849710422011-05-31T05:28:41.202+01:002011-05-31T05:28:41.202+01:00Gravity has an entropic side: after all it leads t...Gravity has an entropic side: after all it leads to black hole entropy. If you believe that gravity has no entropic side, you deny black hole entropy. The Verlinde argument just takes shows that this entropic aspect, when applied to all systems, not only black holes, leads to Newton's law. <br /><br />Feel free to believe that gravity is not entropic, but then you live in another universe.Clara, once known as Nemohttps://www.blogger.com/profile/15931393389874902234noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-51974455432274569962011-05-30T04:07:37.397+01:002011-05-30T04:07:37.397+01:00"Not believing that gravity is entropic means..."Not believing that gravity is entropic means denying black hole entropy."<br /><br />Sorry, but the above remark is nonsenseAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-69069868152687339052011-01-14T12:37:35.071+00:002011-01-14T12:37:35.071+00:00Anonymous,
Not believing that gravity is entropi...Anonymous, <br /><br />Not believing that gravity is entropic means denying black hole entropy. <br /><br />Everybody has his own prejudices.Clara, once known as Nemohttps://www.blogger.com/profile/15931393389874902234noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-73814463069992123472011-01-11T21:08:18.639+00:002011-01-11T21:08:18.639+00:00I came across this post by browsing the internet, ...I came across this post by browsing the internet, and can not resist to put a remark. The author seems has complete misunderstanding of very simple things such as classical Coulomb and Newtonian forces. Surely, transition from quantum electrodynamics to classical electrodynamics involves decoherence and thus the classical field carries the entropy. However, it is the gradient of the potential (not the entropy!) which produces the Coulomb force. The same presumably applies to the gravitational force, unless you believe Verlinde. I do not.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-29420086250266824152011-01-03T12:22:20.894+00:002011-01-03T12:22:20.894+00:00Ok, but we are very far from the original posting ...Ok, but we are very far from the original posting now. I just wanted to say that gravity is obviously entropic, no doubt about it.Clara, once known as Nemohttps://www.blogger.com/profile/15931393389874902234noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-70058136263337490632011-01-02T20:46:45.999+00:002011-01-02T20:46:45.999+00:00Yes, a photon subsystem may have entropy but the v...Yes, a photon subsystem may have entropy but the virtual photons belong to particles and the particle subsystem entropy is calculated somewhat differently.Vladimir Kalitvianskihttps://www.blogger.com/profile/16310670038267361671noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-72405577447887443572011-01-02T19:36:25.534+00:002011-01-02T19:36:25.534+00:00Te argument above is independent of the issue of p...Te argument above is independent of the issue of perturbation theory. Electromagnetic fields have uncertainties, and these uncertainties lead to an entropy of electromagnetic fields.Clara, once known as Nemohttps://www.blogger.com/profile/15931393389874902234noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-13381116618680140772011-01-02T17:26:11.106+00:002011-01-02T17:26:11.106+00:00If the real photons are observed in many experimen...If the real photons are observed in many experiments and are an experimental notion, virtual photons stand for direct interaction of charges that had been known well before inventing the term "virtual photon". Moreover, it is a "perturbative" approach notion, and we know that the perturbation theory in QED fails badly and needs immediately repairing.Vladimir Kalitvianskihttps://www.blogger.com/profile/16310670038267361671noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-39261437204489742342011-01-02T06:15:38.766+00:002011-01-02T06:15:38.766+00:00Real and virtual photons have almost the same prop...Real and virtual photons have almost the same properties. <br /><br />The virtual photons that create 1/r^2 also create field uncertainties which contain entropy. (This entropy is a pure quantum effect that does not exist classically.)Clara, once known as Nemohttps://www.blogger.com/profile/15931393389874902234noreply@blogger.comtag:blogger.com,1999:blog-5237654928835551390.post-51839894869825416612011-01-01T12:51:36.165+00:002011-01-01T12:51:36.165+00:00Photons and "virtual photons" are very d...Photons and "virtual photons" are very different in their properties. Photon flux or gas may be in equilibrium or not and it is described with giving occupation numbers of photon states. <br /><br />"Virtual photons" is a sloppy name for interaction between charges. Factually, it is something like 1/|r1 - r2|. It is quite certain. I do not see how one can infer any entropy from it.Vladimir Kalitvianskihttps://www.blogger.com/profile/16310670038267361671noreply@blogger.com