tag:blogger.com,1999:blog-22973357.post1652926433713768114..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Turtles all the way upSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger33125tag:blogger.com,1999:blog-22973357.post-44504813829359532952008-09-08T16:58:00.000-04:002008-09-08T16:58:00.000-04:00I missed this:"For me then it is to ask if all is ...I missed this:<BR/><BR/>"For me then it is to ask if all is created by process and therefore driven by this potential or is everything already there in total and the process an illusion that simply marks the place? The real question of course is what experiment could ever decide?"<BR/><BR/>I find it simpler to just 'assume' that all IS process and hence there's no (philosophical) question.bellamyhttps://www.blogger.com/profile/12243108422389386105noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-40582993893999805372008-09-08T11:58:00.000-04:002008-09-08T11:58:00.000-04:00I have expounded further in regards to "symmetry" ...I have <A HREF="http://eskesthai.blogspot.com/2008/09/turtles-and-elephants.html" REL="nofollow" TITLE="Turtles and Elephants">expounded further</A> in regards to "symmetry" in the comment section, plus an update on the attempts to download.<BR/><BR/>Does anyone know if "a wifi" can connect in a library?PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-49831673372380279212008-09-07T18:18:00.000-04:002008-09-07T18:18:00.000-04:00Oops,The newby forgot something. It figures.What i...Oops,<BR/><BR/>The newby forgot something. It figures.<BR/><BR/>What inspired me beyond the quoted text of your post, Bee, was the second quote, which isn't in my post. That was the superturtle bit, of course.<BR/><BR/>To be very unscientific, a single superequation or theory just feels fundamentally wrong to me, and the points in my previous post were leading up to why.<BR/><BR/>Here is the Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-72915013182920332452008-09-07T17:54:00.000-04:002008-09-07T17:54:00.000-04:00Bee,Quote "...if we look closer into the microscop...Bee,<BR/><BR/>Quote "...if we look closer into the microscopic features of nature, we might have to refine our theories over and over again."<BR/><BR/>This got me thinking.<BR/><BR/>I am not a physicist (or scientist) so please excuse me if I get some the following wrong.<BR/><BR/>1. What if the theories "over and over again" are inherent in the design of the universe? A possible explanation isAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-88361770659848833912008-09-06T14:56:00.000-04:002008-09-06T14:56:00.000-04:00Tegmark seems to have found his own reason for bei...Tegmark seems to have found his own reason for being and the universe being with that idea. How is it different than faith in a deity, etc? It isn't - in that he apparently needs something to believe in. All of you do, in some fashion or other. There lies the dilemma.bellamyhttps://www.blogger.com/profile/12243108422389386105noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-590022376242735412008-09-05T11:42:00.000-04:002008-09-05T11:42:00.000-04:00Except possibly you're reffering to Justin, who ha...Except possibly you're reffering to Justin, who has organized the conference and is introducing Paul Davies. Give it 60 seconds or so before the talk begins. Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-38478425821392465402008-09-05T11:40:00.000-04:002008-09-05T11:40:00.000-04:00Hi Plato,I don't know what the problem is, the lin...Hi Plato,<BR/><BR/>I don't know what the problem is, the link works fine for me. Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-79661124283128707002008-09-05T11:12:00.000-04:002008-09-05T11:12:00.000-04:00The PIRSA link did not establish a connection with...The PIRSA link did not establish a connection with the right talk. Just some fellow with a talking stick(heritage) and Canadian inflection of the speaker of the moment. You know we took our hockey serious at one time?:)<BR/><BR/>Double checked Paul Davies image just to be sure :)<BR/><BR/>Best,PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-70889343917259369612008-09-05T10:38:00.000-04:002008-09-05T10:38:00.000-04:00Dr.Who:if you fail to explain all these things, th...<B>Dr.Who</B>:<I>if you fail to explain all these things, then the bubble universe approach is dead.</I><BR/><BR/>To me it wold be a mistake to assume because of a 13.7 billion year cyclical nature, that such a process can not evolve much quicker, and if such a position is taken to explain why certain circumstances exist, according to phenomenological data, then it is dead for you, and others whoPlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-78224777225559901392008-09-05T08:27:00.000-04:002008-09-05T08:27:00.000-04:00Hi Plato,Thanks for letting me know of the typo, I...Hi Plato,<BR/><BR/>Thanks for letting me know of the typo, I hadn't even noticed. Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-61012750295463385922008-09-05T06:15:00.000-04:002008-09-05T06:15:00.000-04:00Dr Who said: "More serious answer ... the bubble n...Dr Who said: <EM>"More serious answer ... the bubble nucleation rate can be estimated, and it is *extremely* slow, so slow that you would not expect any nucleations in a mere 13.7 billion years."</EM><BR/><BR/>Thanks, I'd always wondered about that.Andrew Thomashttps://www.blogger.com/profile/03852211910001840777noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-4264463563806694812008-09-05T05:36:00.000-04:002008-09-05T05:36:00.000-04:00Markk said: "No evidence in reality = not science....Markk said: "No evidence in reality = not science."<BR/><BR/>Sorry, that is crap.<BR/><BR/>Andrew T asked: "- if bubble universes are so mundane and unavoidable - why we have never seen bubble universes emerge within our vast visible universe?"<BR/><BR/>Well, it's a good thing we have never seen this, because if we did we would die a fraction of a second later when we got eaten by the bubble! Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-86629893549213860792008-09-05T00:48:00.000-04:002008-09-05T00:48:00.000-04:00If you correct your Turtles in the opening post ti...If you correct your Turtles in the opening post title, it will not affect the url link that has already been established.PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-69502909504244062642008-09-04T20:34:00.000-04:002008-09-04T20:34:00.000-04:00Hi Bee,My turtles know better. :)We are suspended ...Hi Bee,<BR/><BR/>My turtles <A HREF="http://egregium.wordpress.com/2008/08/24/on-top-of-each-other/" REL="nofollow">know better</A>. :)<BR/><BR/>We are suspended between two infinities, as Pascal so brilliantly put it.<BR/><BR/>In those limits, what is waiting for our minds to grasp?<BR/><BR/>Best wishes,<BR/>ChristineAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-27462483110780337772008-09-04T14:46:00.000-04:002008-09-04T14:46:00.000-04:00To reiterate what I've said before, as to the oddi...To reiterate what I've said before, as to the oddity of "this" being here or even many universes out of "all that can in principle be imagined or described": Many thinkers find it interesting and even odd that we even have to do experiments at all, asking why isn't it just mathematically obvious or discoverable at least, why things are the way they are. But "our universe" (whether "the" universe Neil Bateshttps://www.blogger.com/profile/04564859009749481136noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-78054213113522426932008-09-04T14:31:00.000-04:002008-09-04T14:31:00.000-04:00Chaotic inflation is sort of the textbook version ...Chaotic inflation is sort of the textbook version of that idea. <BR/><BR/>Generically if you allow for inflation to occur at one point, why not at some other point. Presto, baby universes. And yes, the idea *is* taken seriously by a lot of people.<BR/><BR/>The nice thing about CI is that it does make testable predictions and is amongst the statistically favored versions of inflation atm with Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-43398797617315432302008-09-04T09:27:00.000-04:002008-09-04T09:27:00.000-04:00Hi Dr. WhoIn other words, the multiverse is mainst...Hi Dr. Who<BR/><BR/><I>In other words, the multiverse is mainstream: anyone who claims that there is NO multiverse had better have a good, necessarily highly technical explanation as to why it can't happen</I><BR/><BR/>I think you're using the word 'mainstream' is a very funny way. Things don't become 'mainstream' because they are generic and generically useless, but because they are good for Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-48715951564752740742008-09-04T09:19:00.000-04:002008-09-04T09:19:00.000-04:00Dear Arun,As with all these theorems, it rests on ...Dear Arun,<BR/><BR/>As with all these theorems, it rests on some assumptions and if they don't apply one can't draw the conclusion. I believe Lorentz invariance is one of them? (I didn't read Lubos' post, so not sure what the context was.) The theorem is useful if you want to make a massless particle composite (which is usually a bad idea) in QFT. As you might know, I'm not personally much into Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-10665653705099053232008-09-04T05:49:00.000-04:002008-09-04T05:49:00.000-04:00Valuing Negativity by Mark Trodden The basic poi...<A HREF="http://cosmicvariance.com/2006/06/13/valuing-negativity/" REL="nofollow" TITLE="Mark at 10-36 pm, June 13th, 2006">Valuing Negativity</A> by Mark Trodden <BR/><BR/><I>The basic point is that if one assumes that the generators of the internal symmetry group are commuting operators (and that their commutation relations define the group - i.e. that they comprise a Lie algebra), then the PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-22192601144351691662008-09-04T05:36:00.000-04:002008-09-04T05:36:00.000-04:00I still have yet to download Davies talk, given th...I still have yet to download Davies talk, given the constraints the work schedule limits with regard to the "intranet."<BR/><BR/>But just reading briefly Dr. Who's position and Markk suggestion that Dr. Who is confusing model with reality.<BR/><BR/>Bold and italicized were added by me.<BR/><BR/><I><A HREF="http://en.wikipedia.org/wiki/Coleman-Mandula_theorem" REL="nofollow">The Coleman-Mandula PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-75354240054785528452008-09-04T04:34:00.000-04:002008-09-04T04:34:00.000-04:00Dr Who said: "In other words, the multiverse is ma...Dr Who said: <EM>"In other words, the multiverse is mainstream: anyone who claims that there is NO multiverse had better have a good, necessarily highly technical explanation as to why it can't happen. All this stuff you hear about the multiverse being "wild speculation", "not science" etc is just wrong."</EM><BR/><BR/>Hi, I'm not an expert in this area, so can you explain why - if bubble Andrew Thomashttps://www.blogger.com/profile/03852211910001840777noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-26346389234023233892008-09-03T23:16:00.000-04:002008-09-03T23:16:00.000-04:00"Once you allow a scalar field with a potential wh..."Once you allow a scalar field with a potential which is "generic" in some sense, then the bubble nucleation mechanism is bound to produce "new universes" inside those bubbles. In other words, the multiverse is mainstream: anyone who claims that there is NO multiverse had better have a good, necessarily highly technical explanation as to why it can't happen."<BR/><BR/>You are confusing model withAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-16393724212790874012008-09-03T23:07:00.000-04:002008-09-03T23:07:00.000-04:00Dear Bee,Luboš had a point of a sort on his blog ...Dear Bee,<BR/><BR/>Luboš had a point of a sort on his blog about emergent gravity - there is a theorem by Weinberg/Witten that a spin-2 composite massless particle can't exist in QFT. (I wonder what constraints that puts on an effective QFT.) So it seems that the emergent graviton will have to emerge rather delicately.Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-54942032889895487322008-09-03T22:11:00.000-04:002008-09-03T22:11:00.000-04:00Bee said: "Emerging Multiverse-superlaws determini...Bee said: "Emerging Multiverse-superlaws determining how we are embedded in the ensemble of universes that we might be part of?"<BR/><BR/>That might be interesting, but I would like to ask: what is it that needs explaining by such superlaws?<BR/><BR/>The interesting thing about all this, something that always impresses me, is not that the multiverse idea is so weird, but just the opposite: it's Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-42463011281128234852008-09-03T15:05:00.000-04:002008-09-03T15:05:00.000-04:00Turtle theory is much richer than mentioned. A Br...Turtle theory is much richer than mentioned. A British turtle is a tortoise. "Turtles all the way down" is silly. "Tortoises all the way down" is robust theory.<BR/><BR/>Elephants, turtles, or tortoises, deep down they have chiral L-protein amino acids and chiral D-sugars. All their DNA is helical in the same sense.<BR/><BR/>Equivalence Principle <A HREF="http://www.mazepath.com/uncleal/qz4.Anonymousnoreply@blogger.com