tag:blogger.com,1999:blog-22973357.post6994552395105179780..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Have your multiverse and eat itSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger58125tag:blogger.com,1999:blog-22973357.post-20983468412265478072013-06-05T08:37:29.183-04:002013-06-05T08:37:29.183-04:00This comment has been removed by the author.Andrew Thomashttps://www.blogger.com/profile/11075608749064975687noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-63392873903737410682013-06-05T03:59:37.507-04:002013-06-05T03:59:37.507-04:00Let's see if links can be embedded on this blo...Let's see if links can be embedded on this blog.<br /><br />How about <a href="http://abstrusegoose.com/511" rel="nofollow">a short summary</a>?<br />Phillip Helbighttps://www.blogger.com/profile/12067585245603436809noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-86703014322341535642013-06-05T03:58:44.322-04:002013-06-05T03:58:44.322-04:00How about a short summary?
http://abstrusegoose.c...How about a short summary?<br /><br />http://abstrusegoose.com/511<br />Phillip Helbighttps://www.blogger.com/profile/12067585245603436809noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-61332460733473660442013-06-04T02:03:53.053-04:002013-06-04T02:03:53.053-04:00Eric
"I just find that the whole eternal infl...Eric<br />"I just find that the whole eternal inflation and multiple universe thing is not convincing."<br />That's what I am saying too. The only point that I wanted to make, and that's what got clear to me when I watched the video, is that if you buy inflation it's hard to avoid the conclusion that there is a multiverse.<br />BUT I have done some readings on inflation in MarkusMhttps://www.blogger.com/profile/03431499396962852389noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45432202301433211712013-06-03T18:09:54.427-04:002013-06-03T18:09:54.427-04:00With apologies, but its hockey playoff time and I ...With apologies, but its hockey playoff time and I am spoiling to take the gloves off.<br /><br />Considering the following list of celebrity conference speakers:<br />L. Randall,<br />N. Arkani-Hamed,<br />E. Witten,<br />L. Susskind,<br />S. Carroll,<br /><br />has any of these people EVER come up with an (1) original idea about nature that has (2) generated a definitive prediction, which (3) Robert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-73394698090243167392013-06-03T14:05:47.652-04:002013-06-03T14:05:47.652-04:00Hi Marcus,
I appreciate your calm disposition on t...Hi Marcus,<br />I appreciate your calm disposition on these debates. I confess I tend to get worked up but but I also try not to let it affect my actual logic.<br /><br />I just find that the whole eternal inflation and multiple universe thing is not convincing. I think there is something in qft relating to a possible Hamiltonian over all time and all particles that is not being accounted for. IfErichttps://www.blogger.com/profile/08213251864943443334noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-5741385365740100482013-06-03T06:55:00.908-04:002013-06-03T06:55:00.908-04:00Hi Phil,
No, sorry, I haven't had time to wat...Hi Phil,<br /><br />No, sorry, I haven't had time to watch it. The weekend has been very busy. Best,<br /><br />SabineSabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20800034375159919552013-06-03T03:31:34.529-04:002013-06-03T03:31:34.529-04:00Eric,
"I do not know if you agree with his an...Eric,<br />"I do not know if you agree with his analysis but I certainly don't." <br />Sorry, but I do.<br /><br />"What we measure is that the universe is uncurved."<br />Interestingly on the transparency there is the additional word "so" which makes all the difference.<br /><br />"...the universe should get more curved as time goes on." Given his MarkusMhttps://www.blogger.com/profile/03431499396962852389noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3453407994627220322013-06-02T20:57:28.467-04:002013-06-02T20:57:28.467-04:00Hi Bee,
Wondering if you watched this weekend’s W...Hi Bee,<br /><br />Wondering if you watched this weekend’s World Science Festival debate on the <a href="http://worldsciencefestival.com/events/multiverse" rel="nofollow">Multiverse hypothesis </a> ? What this entailed was to pit Andrei Linde and Alan Guth against Andreas Albrecht and Neil Turok; with the former pair representing its advocates and the latter its detractors. In the end however I Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-11205371679047379532013-06-02T20:53:40.376-04:002013-06-02T20:53:40.376-04:00This comment has been removed by the author.Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-43840462776042620392013-06-02T16:16:21.414-04:002013-06-02T16:16:21.414-04:00MarcusM,
I watched the youtube video you put up fr...MarcusM,<br />I watched the youtube video you put up from Seti with Dr. Anthony Aguirre. I do not know if you agree with his analysis but I certainly don't. <br /><br />At about 18:45 he says (paraphrasing) "What we measure is that the universe is uncurved." This is just incorrect. He also says at one point that the equations say the universe should get more curved as time goes on. Erichttps://www.blogger.com/profile/08213251864943443334noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-91751976550467516932013-06-02T13:04:18.192-04:002013-06-02T13:04:18.192-04:00FYI
http://www.youtube.com/watch?v=gvV9Oo5Kvx0FYI<br />http://www.youtube.com/watch?v=gvV9Oo5Kvx0MarkusMhttps://www.blogger.com/profile/03431499396962852389noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-21115472962324045202013-06-02T12:29:30.662-04:002013-06-02T12:29:30.662-04:00The string theorists are particularly confused in ...The string theorists are particularly confused in this regard. We can ask easily, if the particles are formed with strings undulating in eight dimensions (which are belonging into our universe in this way) - why just these extradimensions don't belong into our Universe at the case of hyperdimensional branes of ekpyrotic cosmology?Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-44480895932975255702013-06-02T12:28:27.302-04:002013-06-02T12:28:27.302-04:00Zephir,
once you accept (eternal) inflation, the ...Zephir,<br /><br />once you accept (eternal) inflation, the multiverse is nearly forced upon you - see this:<br />http://www.youtube.com/watch?v=G59zIL2nacI<br /><br />Best.MarkusMhttps://www.blogger.com/profile/03431499396962852389noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-57708282102946778672013-06-02T12:12:26.445-04:002013-06-02T12:12:26.445-04:00Plato,
* Yes that's the pic, thanks for the im...Plato,<br />* Yes that's the pic, thanks for the improved link.<br />* What I mean by alchemy is that in medieval times people desperately tried to "bake" gold but they of course failed because they used chemistry instead of "nuclear chemistry" - the wrong approach. I would not want to go that far to make a connection between Platonism and alchemy - too many great MarkusMhttps://www.blogger.com/profile/03431499396962852389noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-56280461791075247022013-06-02T12:08:20.605-04:002013-06-02T12:08:20.605-04:00The multiverse concept is a semantic nonsense, bec...The multiverse concept is a semantic nonsense, because it simply can never have observational support - at the moment, when something becomes observable, the it authomatically becomes a portion of our Universe. <br /><br />The only motivation for multiverse is therefore ideological: the physicists do realize quite well, that the astronomers observed many things, which already violate the Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-27536442219278729352013-06-02T10:28:54.371-04:002013-06-02T10:28:54.371-04:00MarkusM,
String Theory is interested in Condense ...MarkusM,<br /><br />String Theory is interested in Condense Matter Theory which is what Laughlin represents.<br /><br />I have had a picture manifesting in my head of a "cookie monster." Some may talk about spaghetti?:) I mean we could easily say that the cookie is like a "kernel of popcorn," but in this case the cookie is sort of like <a href="http://www.nasa.gov/centers/PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-81645748033386018392013-06-02T10:21:49.119-04:002013-06-02T10:21:49.119-04:00As to Helbig's treat of legal action, I would ...<br />As to Helbig's treat of legal action, I would say to the cosmology equivalent of Rush Limbaugh: Bring it on, you pseudo-scientific clown!<br />Robert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-80154151004990572212013-06-02T10:17:02.743-04:002013-06-02T10:17:02.743-04:00
Helbig is wrong again even though I patiently exp...<br />Helbig is wrong again even though I patiently explained this to him 4 times before.<br /><br />Discrete Scale Relativity still predicts electron structure with a radius of about 4 x 10^-17 cm.<br /><br />I also pointed out to the selectively forgetful gasbag that when DSR scaling is applied to the Einstein-Maxwell equations (Kerr-Newman metric), then the electron can be shown to Robert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-12743215809563484272013-06-02T10:07:32.310-04:002013-06-02T10:07:32.310-04:00In concert with Bee's post "Listen to Spa...In concert with Bee's post "Listen to Spacetime," <a href="http://www.eskesthai.com/2013/04/hearing-shape-of-drum.html" title="Hearing the Shape of the Drum" rel="nofollow">this post</a> is important? I am projecting forward to a time where the necessity of validation comes to all things?:)<br /><br />Best,PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-71969080302471353462013-06-02T09:53:19.201-04:002013-06-02T09:53:19.201-04:00Hi MarkusM,
I hope this is the pic that you are t...Hi MarkusM,<br /><br />I hope this is <a href="http://hyperphysics.phy-astr.gsu.edu/hbase/astro/imgast/smbrk.gif" rel="nofollow">the pic</a> that you are trying to <a href="http://hyperphysics.phy-astr.gsu.edu/hbase/astro/unify.html" rel="nofollow">bring forward</a> here?<br /><br /><br />Would you suggest that a Platonist at heart is a alchemist?:)Would you not agree there is indeed a PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-27321882611371519982013-06-02T07:38:41.253-04:002013-06-02T07:38:41.253-04:00I have just read the two papers by Steinhard and I...I have just read the two papers by Steinhard and I must say that I share his concerns.<br /><br />Another thing that worries me is that the running couplings seem to meet where inflation is supposed to have happened. (If this picture is right): <br />http://i.stack.imgur.com/6qQn8.gif<br /><br />To my taste this looks like a phase transition, where some unknown GUT symmetry is broken. This I MarkusMhttps://www.blogger.com/profile/03431499396962852389noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-51302366055563480402013-06-02T07:12:59.980-04:002013-06-02T07:12:59.980-04:00@RLO: If the paper discusses another possibility, ...@RLO: If the paper discusses another possibility, then the abstract is misleading if it mentions just one possibility and calls it a definitive prediction.<br /><br />You yourself have said many times that a theory which makes multiple predictions is not useful. I agree.<br /><br />Searching some obvious places on the web will reveal that someone made a public retraction after I threatened him Phillip Helbighttps://www.blogger.com/profile/12067585245603436809noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-88404367703228802942013-06-01T15:55:31.174-04:002013-06-01T15:55:31.174-04:00Helbig can "rest [his] case" but as I ha...<br />Helbig can "rest [his] case" but as I have told him at least 4 times before the paper says more than the one sentence he quotes. It clearly identifies two basic possible structures for the electron. Subsequent developments favor the one Helbig conveniently and dishonestly fails to mention. Helbig has been made fully aware of DSR's empirically viable position on this issue. TheRobert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-32542233572249108832013-06-01T10:49:33.127-04:002013-06-01T10:49:33.127-04:00I quote from http://adsabs.harvard.edu/abs/1987ApJ...I quote from http://adsabs.harvard.edu/abs/1987ApJ...322...34O which contains DSR's definitive prediction in the abstract:<br /><br />"Two definitive predictions are also pointed out: (1)the model predicts that the electron will be found to have structure with radius $4\times 10^{-17}$ cm"<br /><br />Modern accelerator experiments can compare QED predictions to observations, with Phillip Helbighttps://www.blogger.com/profile/12067585245603436809noreply@blogger.com