tag:blogger.com,1999:blog-22973357.post3484364108881357340..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Understanding Quantum Mechanics #4: It’s not as difficult as you think! (The Bra-Ket)Sabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger64125tag:blogger.com,1999:blog-22973357.post-41212155734604145602020-08-15T03:21:15.673-04:002020-08-15T03:21:15.673-04:00My Friend,
Please don't take this the wrong... My Friend,<br /><br /> Please don't take this the wrong way, but<br /> ... nice try .A.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-87544644110729163802020-07-30T22:56:48.783-04:002020-07-30T22:56:48.783-04:00 Cool,
-- there is no spoon.
Thanks, Cool,<br /><br /> -- there is no spoon.<br /><br /><br /> Thanks,A.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-34618252090995168582020-07-30T22:42:19.053-04:002020-07-30T22:42:19.053-04:00 Nice point. Nice point.A.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-83294755484056029132020-07-28T00:57:35.225-04:002020-07-28T00:57:35.225-04:00Alrighty,then.
First, and foremost.
Hi Sabine... Alrighty,then.<br /> First, and foremost.<br /> Hi Sabine !!! I hope your day is going well.<br /><br /> Secondly, Alex.<br /><br />Your question is so vague that it is very hard to understand.<br /> It seems like two, first what is the nature of a Hilbert space.?<br /> Secondly, a particle (wierd). coordinates of 2, 3, 0. <br /> You must be more specific.<br /> 1) what particle are A.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-18348018870597532962020-07-27T12:56:11.162-04:002020-07-27T12:56:11.162-04:00@PhysicistDave
Hello, Dave,
the differential cal...@PhysicistDave<br /><br />Hello, Dave,<br /><br />the differential calculus is part of the problem of understanding micro-objects.<br /><br />About 2000 years ago, Ptolemy placed the earth at the center of the universe.<br />It was an assumption. Maybe he made it for convenience because we<br />observe stars and planets from the earth.<br />It was an assumption. But in time, it was forgotten. AndStefan Freundthttps://www.blogger.com/profile/04834262116439292657noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-88563591786538758172020-07-27T01:12:14.486-04:002020-07-27T01:12:14.486-04:00Cool, man.
Whenever you do, I'll be around. (... Cool, man.<br /><br />Whenever you do, I'll be around. (some where )<br /><br /> - it's always nice to talk to someone who thinks outside the box.<br /> Best wishesA.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-70919803937764718752020-07-26T15:12:29.957-04:002020-07-26T15:12:29.957-04:00Thanks. I saw a couple of these videos, and they s...Thanks. I saw a couple of these videos, and they seem to be really good. <br /><br />Also, it was only today that I came across the "QuVis" simulations developed at U. of St. Andrews. The simulations here are interactive, and though the UI is relatively simple, their underlying design seems to have been done thoughtfully. The modules are on a slightly more advanced / theoretical side asAjit R. Jadhavhttps://www.blogger.com/profile/02194541129055576042noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3980086721343612312020-07-26T05:56:54.778-04:002020-07-26T05:56:54.778-04:00Lawrence
Once more, thank you. Your extended com...Lawrence<br /><br />Once more, thank you. Your extended comments are, and will be, very useful and are much appreciated. I followed some of it and can try to follow the rest later. It has given me more ideas, and maybe antiparticles have the geometry of the other part of a dS biverse and not hat of an AdS space, but maybe for another thread ...<br /><br />On the theme of learning QM. I ben6993https://www.blogger.com/profile/11246990849377879772noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-28889623475725806492020-07-26T01:06:50.244-04:002020-07-26T01:06:50.244-04:00Daid Bailey,
I personally find it hard to read... Daid Bailey,<br /> I personally find it hard to read about someone breaking their head over such things .<br /> Really,<br /> My friend,<br /><br /> Truly, Any Matrix...<br /> Is ad hoc, meaning for this purpose only ,or primarily. (Useful at this moment).<br /><br /> I've seen, and examined matrices from thousands of years ago.<br /><br /> Ultimately,<br /> - it comes down to A.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-48204984576970025982020-07-25T09:20:04.051-04:002020-07-25T09:20:04.051-04:00Can not. In that branch I still have inconsistenci...Can not. In that branch I still have inconsistencies to get rid of.Eusahttps://www.blogger.com/profile/14114706429392111062noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-86162671897578925832020-07-25T08:52:32.286-04:002020-07-25T08:52:32.286-04:00With respect to the cosmos, the einselection of th...With respect to the cosmos, the einselection of the classical state of the universe is a problem of quantum gravitation. With the superposition of a single particle state, say the two-slit experiment, the mass-energy of the particle means its gravity field has a source associated with both slits. The gravity field is itself in a superposition of states. For a light enough of a particle the Lawrence Crowellhttps://www.blogger.com/profile/12090839464038445335noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-33235890567818837902020-07-25T00:49:08.386-04:002020-07-25T00:49:08.386-04:00 My friend,
Show me your papers. My friend,<br /> Show me your papers.A.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-39178933918247350702020-07-23T20:17:32.430-04:002020-07-23T20:17:32.430-04:00Gary Alan,
Well... “the environment” is not part ...Gary Alan,<br /><br />Well... “the environment” is not part of the formalism of quantum mechanics! To refer to the basis ambiguity as being resolved by the “environment” is just smuggling measurement postulates back in through the back door. Might as well just stick with the Copenhagen interpretation and accept that “for all practical purposes” QM does not apply to the macro world.<br /><br />PhysicistDavehttps://www.blogger.com/profile/11111405959451703182noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-40824253588860587212020-07-23T11:42:48.886-04:002020-07-23T11:42:48.886-04:00But where do these rules come from?But where do these rules come from?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-88487240923274060432020-07-23T08:52:13.443-04:002020-07-23T08:52:13.443-04:00The relationship between de Sitter and anti-de Sit...The relationship between de Sitter and anti-de Sitter spacetime is respectively that between a single sheet hyperboloid outside a light cone and the two hyperboloids inside the two cones. <br /><br />There are for the dS three ways to partition this into space plus time. The first is a spatial surface at the throat or minimal radius portion of the hyperboloid, The dS spacetime in this situation Lawrence Crowellhttps://www.blogger.com/profile/12090839464038445335noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-8891265456343187922020-07-23T07:59:52.242-04:002020-07-23T07:59:52.242-04:00Thanks, Dave, for your reply. As you are aware, I ...Thanks, Dave, for your reply. As you are aware, I do not believe that the 'preferred basis problem' poses an "insurmountable technical problem." (quoting your phrase). Zurek uses the terminology 'basis ambiguity' arguing that it is settled "by the environment." (arXiv:0707.2832, Relative States and the Environment). Also, rejecting MWI from a perspective Gary Alanhttps://www.blogger.com/profile/15299444226289034923noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-66408121704570729652020-07-23T07:59:33.021-04:002020-07-23T07:59:33.021-04:00Anyhow. I prefer being specific in research papers...Anyhow. I prefer being specific in research papers to arguing in blog comments.Eusahttps://www.blogger.com/profile/14114706429392111062noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-33037298116148760272020-07-23T01:36:02.085-04:002020-07-23T01:36:02.085-04:00Stefan Freund wrote to me:
>Hello Dave, if I un...Stefan Freund wrote to me:<br />>Hello Dave, if I understood you correctly, you see some basic problems in quantum mechanics and understanding of micro objects.<br /><br />Well... maybe we misunderstand <i>macro</i> objects – who knows? But, yeah, basically I agree with Einstein and Schrödinger and de Broglie and Wigner and Steve Weinberg and John Bell and Sabine and many other physicists PhysicistDavehttps://www.blogger.com/profile/11111405959451703182noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-38299504203366635192020-07-23T01:19:47.882-04:002020-07-23T01:19:47.882-04:00Gary Alan asked me:
>While revisiting these pap...Gary Alan asked me:<br />>While revisiting these papers, I asked myself: where are those "insurmountable technical problems" ? <br /><br />There is an extensive literature on what are often known as the “preferred basis” problem and the “probability-measure” problem.<br /><br />From time to time over the decades, the MWI guys claim to have solved these problems, but they never managePhysicistDavehttps://www.blogger.com/profile/11111405959451703182noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-8840162671250297822020-07-23T00:20:12.393-04:002020-07-23T00:20:12.393-04:00Eusa, my friend,
Being specific, actually,
doesn... Eusa, my friend,<br /> Being specific, actually,<br /> doesn't 'demand' anything.<br /> Being specific does, however, require that you use the simplest and most direct terms (technical or not) - and that your rant follow a coherent<br />train of thought (logic, even...) <br /><br /> Better luck<br /> next time.A.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1876908184727163232020-07-22T22:14:40.884-04:002020-07-22T22:14:40.884-04:00Thank you, Sabine! Your explanantion of <|>...Thank you, Sabine! Your explanantion of <|> really helps!Jackhttps://www.blogger.com/profile/16265368119780458329noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-8403422484823581862020-07-22T22:09:19.113-04:002020-07-22T22:09:19.113-04:00Thanks aleazk,
(hope I got it right)
I agree, I... Thanks aleazk,<br /> (hope I got it right)<br />I agree, I, actually, don't see more - or less -<br /> math hurting anyone.<br /> and that's a good thing.<br /> - nice comment.<br />I'm also hoping to reply to<br /> 'Physics Dave'.<br /> - when it comes to<br /> ancient teachings,<br /> - there's supposed to be some ' seven deadly sins'.<br /> A.C.https://www.blogger.com/profile/04994876510058676257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-67602036366351792072020-07-22T16:12:00.349-04:002020-07-22T16:12:00.349-04:00Thanks very much. I am writing a paper and I reck...Thanks very much. I am writing a paper and I reckon you may have just pushed back the completion date...<br /><br />I wrote a paper two years ago (so did J. Farnes, but professionally in his case) on negative mass as the cause of dark matter and dark energy. I recently wrote a paper on time reversal for antiparticles as by-passing Bells inequalities. Now I want to put them together in one ben6993https://www.blogger.com/profile/11246990849377879772noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-27489371209576533082020-07-22T10:45:50.652-04:002020-07-22T10:45:50.652-04:00For what it is worth, I would like to "throw ...For what it is worth, I would like to "throw my hat into the ring" and make a few suggestions regarding useful references. A compact, introductory, textbook 'Quantum Mechanics in Simple Matrix Form' (Jordan, 1985) utilizes only 2X2 matrices (Preface: "assumes only basic algebra"). Jordan also wrote a more advanced text 'Linear Operators For Quantum Mechanics' (Gary Alanhttps://www.blogger.com/profile/15299444226289034923noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1664224973279375112020-07-22T08:47:43.843-04:002020-07-22T08:47:43.843-04:00I came across some really nice 3D animations of ma...I came across some really nice 3D animations of many aspects of Quantum Mechanics on Youtube. These were created by Eugene Khuteryansky, and mostly seem to be about 4 or 5 years old. They seem like a really good complement to the verbal descriptions of QM phenomena.David Schroederhttps://www.blogger.com/profile/18048116250413347228noreply@blogger.com