tag:blogger.com,1999:blog-22973357.post4117028786453966233..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: String theory landscape predicts no new particles at the LHCSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger25125tag:blogger.com,1999:blog-22973357.post-86030477680489384922019-02-17T14:00:31.736-05:002019-02-17T14:00:31.736-05:00"You basically say that society is most likel..."You basically say that society is most likely not able to spent money for something usefull and hence it is better if society hands-over the money to the FCC people"<br /><br /> ??? Again the same bs?<br /><br /> Society is not expected to hand over the money to FCC people. Society, since decades, relies on the decisions of groups of experts, often members of fields not related to roberto kersevanhttps://www.blogger.com/profile/08293551219458418162noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-16339808580700320482019-02-17T13:45:23.504-05:002019-02-17T13:45:23.504-05:00"IMO, we should upgrade to HE-LHC, and if it ..."IMO, we should upgrade to HE-LHC, and if it find something, build the 100TEV, if it doesn't find anything, perhaps HEP should wait until wakefield technology is ready."<br /><br /> Unfortunately upgrading to HE-LHC would not help much, since HE-LHC still would need 16T magnets, for a mere doubling of LHC's present beam energy.<br /> In addition, HE-LHC would probably need a roberto kersevanhttps://www.blogger.com/profile/08293551219458418162noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-21878468962312817852019-02-06T09:18:04.161-05:002019-02-06T09:18:04.161-05:00I think in general the landscape as it pertains to...I think in general the landscape as it pertains to this world is questionable. The string or M-theory landscape is really something that pertains to anti-de Sitter spacetimes. We exist in an approximately de Sitter spacetime. We may be in a sort of vacuum pocket of low energy in an eternal inflating spacetime similar to a de Sitter spacetime with a large vacuum energy or positive cosmological Lawrence Crowellhttps://www.blogger.com/profile/12090839464038445335noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-53238628761860658412019-02-06T06:48:40.329-05:002019-02-06T06:48:40.329-05:00No, no, right after the measured value of the Higg...No, no, right after the measured value of the Higgs was discussed, string theory was totally able to predict it:<br />http://www.math.columbia.edu/~woit/wordpress/?p=4262<br />Quote:<br />"n a remarkable coincidence, after more than 25 years of unsuccessfully trying to extract a definite experimental prediction from string theory, Kane and collaborators were able to achieve the holy grail ofMartinBhttps://www.blogger.com/profile/15439162869843258149noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-88203567884446796012019-02-06T04:14:47.800-05:002019-02-06T04:14:47.800-05:00Actually, reading articles like this makes you won...Actually, reading articles like this makes you wonder if anyone is willing to reflect these days. It's also pertinent, because arguments presented against a new collider seem to boil down to two (that are plausible to me):<br />a) better ways to spend that money and<br />b) giving people a new machine may prolong an unhealthy way of working in the field (as far as theorycrafting is concerned)G. Bahlehttps://www.blogger.com/profile/05542705902147416044noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-17307149380446962922019-02-06T04:08:42.409-05:002019-02-06T04:08:42.409-05:00I'm very sorry for the off-topic :(. Just ask ...I'm very sorry for the off-topic :(. Just ask you, please, if you (or anybody) know about some paper that goes in the direction commented.<br /><br />By the way, the "yes" is for the dark matter issue and the "maybe" for the possible "dark energy" relation, isn't it?<br /><br />Regards.<br /><br />P.S.: No more off-topic I promise. Samuhttps://www.blogger.com/profile/05545253890973817644noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-82265790555973019322019-02-06T02:55:36.652-05:002019-02-06T02:55:36.652-05:001) yes
2) maybe
3) please avoid off-topic comments...1) yes<br />2) maybe<br />3) please avoid off-topic comments. I don't have time to answer random questions.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-89916056856839348092019-02-06T02:17:59.705-05:002019-02-06T02:17:59.705-05:00Hi, Sabine.
Talking about dark matter:
Please, c...Hi, Sabine.<br /><br />Talking about dark matter:<br /><br />Please, can you tell me if mathematically is consistent to postulate that dark matter could be a field whose particles don't interact at all with our "ordinary" matter (nor by the electroweak force neither by strong nuclear force) and that just by deforming the space-time with its mass(in a GR way) it disturbs indirectly Samuhttps://www.blogger.com/profile/05545253890973817644noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-35432378887719663642019-02-06T01:07:04.396-05:002019-02-06T01:07:04.396-05:00So do we need parallel universes or is it just inf...So do we need parallel universes or is it just infinite possibilities, the whole?Gokul Gopisettihttps://www.blogger.com/profile/00044660491634948291noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-4946750199154396822019-02-06T00:42:37.353-05:002019-02-06T00:42:37.353-05:00That's the funniest thing I've heard in at...That's the funniest thing I've heard in at least a week. Thank you.David Lamberthttps://www.blogger.com/profile/16220542063047743937noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-53989821193813098182019-02-06T00:10:30.230-05:002019-02-06T00:10:30.230-05:00As I said, they talk about the HE-LHC, not the FCC...As I said, they talk about the HE-LHC, not the FCC. The energy of the former is about 27 TeV, the latter 100 TeV. But if they don't see anything at 27 TeV, I'm sure they'll find a reason why it ought to be at 100 TeV. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-74658504129190584162019-02-05T23:56:25.367-05:002019-02-05T23:56:25.367-05:00I see what you did there ;) They are not string th...I see what you did there ;) They are not string theorists though. This is what is called "particle physics phenomenology". But string theory serves as an excuse for all kinds of speculations. People use it to make their ideas sound credible.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-81284049336089298582019-02-05T23:54:27.005-05:002019-02-05T23:54:27.005-05:00This solution is replaced by the new version of na...This solution is replaced by the new version of naturalness. If it is natural in the new way, that solves the problem by definition. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-26072002284067764002019-02-05T19:01:41.928-05:002019-02-05T19:01:41.928-05:00I'm not a physicist but the bald circularity o...I'm not a physicist but the bald circularity of the type of argument that begins with an a priori probability distribution is something that I often see in my field (ecology) too. I applaud Sabine for returning to that point relentlessly.Anonymoushttps://www.blogger.com/profile/00654393826566419229noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-77248236576618462052019-02-05T18:04:35.947-05:002019-02-05T18:04:35.947-05:00And is it also the case that all these new particl...And is it also the case that all these new particles predicted by the paper will appear at *exactly* the range that the proposed $ 20 billion collider will probe ?<br />This is the meta-prediction I am making for all particle physics papers which will come out over the next few years. :)senanindyahttps://www.blogger.com/profile/04275136786127034360noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-48882031473154529772019-02-05T16:00:09.932-05:002019-02-05T16:00:09.932-05:00If I understand you correctly, you're saying t...If I understand you correctly, you're saying these theorists are making a circular argument. Louis Wilburhttps://www.blogger.com/profile/17153145669881153091noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-53584144213109460852019-02-05T15:38:52.837-05:002019-02-05T15:38:52.837-05:00Sabine, may I ask what is your opinion of Ethan Si...Sabine, may I ask what is your opinion of Ethan Siegel and his writings? He seems to currently be promoting the bigger, better LHC. Although I mostly think of him as a astrophysics writer.Wordmemehttps://www.blogger.com/profile/10443901642340316266noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-35263599285657865052019-02-05T14:39:31.778-05:002019-02-05T14:39:31.778-05:00"The idea underlying their calculation is tha..."The idea underlying their calculation is that we live in a multiverse in which universes with all possible combinations of the constants of nature exist."<br /><br />Sister Bee,<br /><br />Please explain conservation of physical quantities in a multiverse scenario. <br />I am thinking that at some nexus the universe is not able to decide between two alternative paths forward and, Don Fosterhttps://www.blogger.com/profile/04814669413022486958noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-91906596434549835012019-02-05T11:38:13.969-05:002019-02-05T11:38:13.969-05:00Yes, that's also my state of knowledge.Yes, that's also my state of knowledge.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-54728294260726150722019-02-05T10:06:39.097-05:002019-02-05T10:06:39.097-05:00" Howard Baer and collaborators predict masse..." Howard Baer and collaborators predict masses of new particles using the string theory landscape."<br /><br />what about the hierarchy problem that SUSY was supposed to solve, requiring LHC- accessible SUSY partners?neohttps://www.blogger.com/profile/16769182614452171312noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-89185100150433796672019-02-05T09:40:15.694-05:002019-02-05T09:40:15.694-05:00bee,
"This upgrade is called HE-LHC and is d...bee,<br /><br />"This upgrade is called HE-LHC and is distinct from the FCC proposal."<br /><br />I'm unclear as to your position on HE-LHC. <br /><br />IMO, we should upgrade to HE-LHC, and if it find something, build the 100TEV, if it doesn't find anything, perhaps HEP should wait until wakefield technology is ready.<br /><br />obviously with this paper plenty of string neohttps://www.blogger.com/profile/16769182614452171312noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-27262114174187727282019-02-05T09:35:33.869-05:002019-02-05T09:35:33.869-05:00In my previous comment, rather than use the word c...In my previous comment, rather than use the word complicated with reference to the abstraction, let's say as the complexity of the program increases the abstraction, or the interpretation becomes more and more "well defined". As the definition improves the certainty increases, and the uncertainty greatly decreases. Now defines or improves the definition? What is it that defines in Gokul Gopisettihttps://www.blogger.com/profile/00044660491634948291noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-79656257477071258882019-02-05T09:19:47.893-05:002019-02-05T09:19:47.893-05:00Did string theory landscape predict mass of the Hi...Did string theory landscape predict mass of the Higgs boson either? AFAIk, this was only predicted by Asymptotic safety (by Wetterich and Shaposhnikov)Shantanuhttps://www.blogger.com/profile/16322812456382858228noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-91120764391950756562019-02-05T09:09:51.678-05:002019-02-05T09:09:51.678-05:00Let's say there are infinite possibilities, th...Let's say there are infinite possibilities, then the observer abstracts based on its program. But what does it abstract? Reality. This reality is constrained, limited by the program and therefore reduces the percentage of probability. In this way if we go on complicating the abstraction by making the program more and more complex the degree of uncertainty decreases and we approach a high Gokul Gopisettihttps://www.blogger.com/profile/00044660491634948291noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-77938982813743245842019-02-05T08:16:39.368-05:002019-02-05T08:16:39.368-05:00Hi Sabine,
can they, based on the natural constan...Hi Sabine,<br /><br />can they, based on the natural constants, compute the likelihood to live in a universe where it is possible to rule-out string theory ? <br /><br />Best,<br />J.akidbellehttps://www.blogger.com/profile/12292741599925116131noreply@blogger.com