tag:blogger.com,1999:blog-22973357.post7250923875701124458..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Frequently Asked QuestionsSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger51125tag:blogger.com,1999:blog-22973357.post-1143703843316614282014-12-02T17:41:18.555-05:002014-12-02T17:41:18.555-05:00In case my comment was misunderstood, by "Gob...In case my comment was misunderstood, by "Goblin" I mean "unknown physical mechanism".<br /><br />eg. Maybe all particles get converted to the lowest stable supersymmetric particles at the extreme Quantum Gravity regime within the "black hole" - so only dark matter gets produced - so nothing visible.<br /><br />or a zillion other possible weird QG things that we Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-4176867982018878002014-11-30T22:35:30.677-05:002014-11-30T22:35:30.677-05:002. Black Holes exist.
er, so if a big Goblin is e...2. Black Holes exist.<br /><br />er, so if a big Goblin is eating all the photons at the centre of our galaxy that's also a "Black Hole" is it?<br /><br /><br />Sorry Sabine, but the Event Horizon is not just the opposite of a hard surface, it is a mathematically precise prediction constructed using classical General RelativityAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-91287448677085997892014-11-23T05:43:07.372-05:002014-11-23T05:43:07.372-05:00Sorry, that's right!
Deleted.Sorry, that's right! <br />Deleted.nemohttps://www.blogger.com/profile/07365330980872106443noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3079365966036921522014-11-23T05:26:12.764-05:002014-11-23T05:26:12.764-05:00Nemo: I appreciate your interest, but please do no...Nemo: I appreciate your interest, but please do not discuss your work here. This is not a good place to do it. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-52270966314696464942014-11-23T03:09:28.718-05:002014-11-23T03:09:28.718-05:00This comment has been removed by the author.nemohttps://www.blogger.com/profile/07365330980872106443noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-75962222805919902542014-11-22T23:58:26.592-05:002014-11-22T23:58:26.592-05:00I am not "dissing" anything or anybody -...I am not "dissing" anything or anybody - I am simply informing the reader about what is going on. If you don't like what's going on that's an entirely different matter.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-59979498829836091242014-11-22T12:56:24.226-05:002014-11-22T12:56:24.226-05:00" It is in principle also possible that inste..." It is in principle also possible that instead there is a way to couple quantum and classical theories that has so far been missed, or that the underlying theory is in some sense neither classical nor quantum, but this option is not favored by most researchers in the field today. "<br /><br />Half of your post is an advert for quantum gravity, you diss alternatives with the above quoteTom Andersenhttps://www.blogger.com/profile/17562906116020498110noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-26761384987314846762014-11-22T12:38:40.211-05:002014-11-22T12:38:40.211-05:00Tom,
"I was saying your mistake was to assum...Tom,<br /><br /><i>"I was saying your mistake was to assume that since most researchers think that we need to quantize gravity, it gives more weight to the likelihood of that path bearing fruit."</i><br /><br />I never said that, please stop putting things into my mouth. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-55079066929641460042014-11-22T10:54:47.407-05:002014-11-22T10:54:47.407-05:00Sabine,
Sorry you misunderstood. I fully agree th...Sabine,<br /><br />Sorry you misunderstood. I fully agree that most researchers think that we must quantize gravity. If history is any guide, the collective wisdom of science has always been wrong - at least on the big picture stuff. <br /><br />I was saying your mistake was to assume that since most researchers think that we need to quantize gravity, it gives more weight to the likelihood of Tom Andersenhttps://www.blogger.com/profile/17562906116020498110noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-60672477227582951522014-11-22T10:31:15.818-05:002014-11-22T10:31:15.818-05:00Tom:
First you claim that it is wrong that "...Tom: <br /><br />First you claim that it is wrong that "most researchers favor this option", then you say history says most researchers are wrong - what is it that you want to say? <br /><br />It is not true that history says most researchers are generally wrong, this is a ridiculous statement. It is true that in some historical cases this has been so. Further, I didn't take a Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-74405511515443242322014-11-22T09:51:38.148-05:002014-11-22T09:51:38.148-05:00Nice article.
You make large mistake when you say...Nice article.<br /><br />You make large mistake when you say<br /><br />"most researchers in the field today" .<br /><br />If history is any guide (and surely it is) then we know that on the bigger questions, most researchers in the field at any given time are absolutely wrong.<br /><br />Also please look up 'this time its different' - a term from economics, which applies Tom Andersenhttps://www.blogger.com/profile/17562906116020498110noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-66824180220233946632014-11-21T22:57:20.600-05:002014-11-21T22:57:20.600-05:00I mean: ...at point 1.2.2I mean: ...at point 1.2.2nemohttps://www.blogger.com/profile/07365330980872106443noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-4206257097633011042014-11-21T22:34:50.103-05:002014-11-21T22:34:50.103-05:00This comment has been removed by the author.nemohttps://www.blogger.com/profile/07365330980872106443noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45009567341242505062014-11-21T22:24:04.324-05:002014-11-21T22:24:04.324-05:00This comment has been removed by the author.nemohttps://www.blogger.com/profile/07365330980872106443noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-53274096595647495732014-11-21T22:17:06.995-05:002014-11-21T22:17:06.995-05:00Hmmm... after seeing the amplituhedron video somet...Hmmm... after seeing the amplituhedron video something deeper is hinted at yet still vaguely that bypasses the question of QM and GR physics as unity and locality derived as a four way deal by simple drawing. After all the idea of gluons being unexplained as periodic has always seemed to me too simple and rather absurd. But the terminology we have inherited is way too complicated. Let that be aL. Edgar Ottohttps://www.blogger.com/profile/00525169618204198073noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-22389937346610362932014-11-21T21:30:13.599-05:002014-11-21T21:30:13.599-05:00maybe gravity doesn't couple to energy, energy...maybe gravity doesn't couple to energy, energy is simply a proxy, gravity couples to something else that is effected by energy.neohttps://www.blogger.com/profile/17318664916557810347noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-78991134158030647372014-11-21T13:52:05.728-05:002014-11-21T13:52:05.728-05:00Maybe because people believe/ afraid not to be und...Maybe because people believe/ afraid not to be understood correctly nemohttps://www.blogger.com/profile/07365330980872106443noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-11222592185459140292014-11-21T12:28:41.497-05:002014-11-21T12:28:41.497-05:00I get annoyed if someone keeps asking me the same ...I get annoyed if someone keeps asking me the same question, but on the other hand I have noticed that when people say something which they think is a good idea they may repeat it, even immediately after they first said it. I may even have done this myself.<br /><br />You should publish a book of these great essays.JimVhttps://www.blogger.com/profile/10198704789965278981noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-88784508643840057862014-11-21T09:34:54.588-05:002014-11-21T09:34:54.588-05:00I found your little Q&A on quantum gravity ver...I found your little Q&A on quantum gravity very helpful in (better) understanding the tension between general relativity and quantum mechanics.<br /><br />Thanks,<br />MikeMichael Goginshttps://www.blogger.com/profile/07300917064580760923noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-53826860516629063982014-11-21T05:37:04.300-05:002014-11-21T05:37:04.300-05:00By saying that the QG effects should be seen at Pl...By saying that the QG effects should be seen at Planck scale, I meant that they should be <br />significant at the Planck scale. However, there could be non-perturbative QG effects at <br />cosmological scales. <br /><br />The value of the cosmological constant is a QG effect, which can be determined perturbatively (see my papers), but since CC is a constant (independent of a length scale) we areA. Mikovichttps://www.blogger.com/profile/03175906801121515444noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45724161604072156802014-11-21T03:57:17.627-05:002014-11-21T03:57:17.627-05:00It is OK if in the interest of the continuity of t...It is OK if in the interest of the continuity of the comment section you delete my reply to Zephir, Professor Hossenfelder. No problem. Others had some good comments relevant to which I would have rather taken time to address. BestL. Edgar Ottohttps://www.blogger.com/profile/00525169618204198073noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-21840929425629874162014-11-21T03:45:47.367-05:002014-11-21T03:45:47.367-05:00So Zephir,
You are raising points of philosophy ...So Zephir,<br /> You are raising points of philosophy which could be science some day so defined and understood, perhaps a day. Infinitely. Far away<br />Consistency or inconsistency is thus a philosophic stance that an ordinary boring truth is not justified in the now by any narrow assertion or result of experiment felt as plain as the nose on our face. Have we falsified QM at its foundations L. Edgar Ottohttps://www.blogger.com/profile/00525169618204198073noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20404167080456457122014-11-21T02:45:07.073-05:002014-11-21T02:45:07.073-05:00Zephir: I have deleted several of your comments. T...Zephir: I have deleted several of your comments. The amount of misinformation in them is more than I am willing to tolerate. *Searches for* extra dimensions and supersymmetry cannot prove that they do not exist, and consequently negative results do not tell you anything about the viability of string theory - so much about your, uhm, logic. Now please stop clogging this comment section with Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-86505455180162442492014-11-21T01:04:44.435-05:002014-11-21T01:04:44.435-05:00/*Tests of extra dimensions and supersymmetry are .../*Tests of extra dimensions and supersymmetry are NOT tests of string theory*/<br /><br />Of course they aren't - but at least without extradimensions the string theory cannot work. And the supersymmetry is required for to have it predictable at least a bit, so that the string theorists are pretty motivated into its confirmation too..<br /><br />So that if we prove, that the extradimensions Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-54370480153595890182014-11-21T00:52:09.622-05:002014-11-21T00:52:09.622-05:00Zephir: Why don't you at least try to understa...Zephir: Why don't you at least try to understand what I am saying and what Peter is saying? Tests of extra dimensions and supersymmetry are NOT tests of string theory. That's the whole point of Peter's writing. If you can't understand his posts, try to understand at least the name of his blog (or book for that matter). This should be even more obvious now because if that was so Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.com