tag:blogger.com,1999:blog-22973357.post2810203219378557670..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: On the Importance of PhenomenologySabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger29125tag:blogger.com,1999:blog-22973357.post-12137756413615804122011-06-05T10:14:54.727-04:002011-06-05T10:14:54.727-04:00Hi Giotis,
Yes, the string/brane gas is one of th...Hi Giotis,<br /><br />Yes, the string/brane gas is one of the models. There's also the ekpyrotic one. That a model is 'constructed in the context of' is exactly what I mean with it's a model that 'uses ingredients of' but doesn't follow from the theory. The mere fact that there are different models with different predictions tells you that. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-88864028118453302972011-06-05T09:29:12.708-04:002011-06-05T09:29:12.708-04:00Hi Bee,
"It for certain doesn't follow f...Hi Bee,<br /><br />"It for certain doesn't follow from string theory, it just uses ingredients from.<br /><br />In what sense?<br /><br />The model I'm talking about (known as KKLMMT) like the majority of the stringy inflationary models are constructed in the strict context of IIB string compactifications. Maybe you have in mind brane models of Randall-Sundrum type which are indeed Giotishttps://www.blogger.com/profile/03594944884584261018noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45418183249353922422011-06-04T09:36:06.745-04:002011-06-04T09:36:06.745-04:00LHC Sound is always an interesting way to look at ...<a href="http://www.lhcsound.com/" rel="nofollow">LHC Sound</a> is always an interesting way to look at things?:)PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45732865253269487212011-06-04T09:26:04.373-04:002011-06-04T09:26:04.373-04:00Osborne Reynolds' Sub-Mechanics of the Univers...Osborne Reynolds' Sub-Mechanics of the Universe and An Inversion of Ideas as to the Structure of the Universe unites quantuum and gravity.<br />See my articles on Scribd.com.<br />Bruce Lamar RosenbergBrucehttps://www.blogger.com/profile/12646687018922041692noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47803060748986875772011-06-03T10:10:25.378-04:002011-06-03T10:10:25.378-04:00Nothing worse then having to quote oneself in orde...Nothing worse then having to quote oneself in order to press the point. Carry on with life indeed as if nothing missed.:)<br /><br /><i>Pure thought(what does this linguistic representation actually mean) would have to lead you there and be most understandable as to leaving no doubt as to what has been derived.</i><br /><br />Algorithmically, the HTML language is representative of the order in PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-40166791397274653142011-06-03T01:57:35.253-04:002011-06-03T01:57:35.253-04:00Hi Igor,
Yes, that is of course entirely true. (T...Hi Igor,<br /><br />Yes, that is of course entirely true. (Though there is some possibility we're already seeing some phenomenology, just haven't recognized it for what it is.) That is certainly responsible for the large number and variety of different models. However, the situation today is in experimental terms very different from how it was a century ago. Today, one has to invest a lotSabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-24784022767385992782011-06-01T10:16:27.727-04:002011-06-01T10:16:27.727-04:00Bee said,"Quantum gravity has the potential t...Bee said,"Quantum gravity has the potential to revolutionize our understanding of space, time, and matter and with it redefine our own place in the world."<br />I feel sorry for the people wmiho have accepted this premise. Quantum Mechanics and its progeny have its problems which have been voiced by many of those who first conceived Quantum Mechanics. General Relativity on conceptual Peter Fredhttps://www.blogger.com/profile/17066390540344321338noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-80867019795797209682011-06-01T09:16:28.919-04:002011-06-01T09:16:28.919-04:00Hi Phil,
TED Talk-Leonard Susskind: My friend Ric...Hi Phil,<br /><br /><a href="http://eskesthai.blogspot.com/2011/05/ted-talk-leonard-susskind-my-friend.html" rel="nofollow">TED Talk-Leonard Susskind: My friend Richard Feynman</a> <br /><br />Listening to this talk with regard to Susskind's opinion about his friend Dick, he too would have thought about, "<i>irreducible basic elements as simple and as few as possible without having to PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20775080557843938122011-06-01T06:33:09.093-04:002011-06-01T06:33:09.093-04:00Hi Bee,
Thus, I now see the value of my prof proc...Hi Bee,<br /><br /><i>Thus, I now see the value of my prof proceeding along the historical development - taking students along the road - though eventually I didn't learn after his lecture notes because I found them too cluttered</i><br /><br />It then could be argued that what is called genius is simply someone who has the historic journey become simpler ;-)<br /><br /><i><b>"The Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-32327920768582111472011-06-01T05:59:14.619-04:002011-06-01T05:59:14.619-04:00Hi Giotis,
No, it's not a derivation from a f...Hi Giotis,<br /><br />No, it's not a derivation from a fundamental theory. It's some brane model for inflation that's currently popular. It for certain doesn't follow from string theory, it just uses ingredients from. There are several other scenarios for string cosmology that are equally well motivated (or not motivated, depending on your perspective). Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-84744906168570972012011-05-31T15:01:55.828-04:002011-05-31T15:01:55.828-04:00"The models currently in use are not derived ..."The models currently in use are not derived from a fundamental theory. Instead, they aim to incorporate and allow tests for specific features the fundamental theory might have, like additional dimensions"<br /><br />Why is that? In one of the most popular model of inflation in String theory the inflaton in 4D is the position of a D3 brane falling in a warped throat of a Calabi-Yau withGiotishttps://www.blogger.com/profile/03594944884584261018noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-5591106295336239152011-05-31T12:47:24.624-04:002011-05-31T12:47:24.624-04:00True story.
There was a rhinoceros kept in a circ...True story.<br /><br />There was a rhinoceros kept in a circular pen at a zoo. It walked around the perimeter incessantly.<br /><br />People felt bad for it, so they dramatically increased the size of the pen.<br /><br />The rhinoceros walked around the same old small circle incessantly.<br /><br />If you want to get somewhere, you have to break out of the cage.Robert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-67324770651822877532011-05-31T11:25:06.558-04:002011-05-31T11:25:06.558-04:00An axiomatic approach towards the reconciliation o...<i>An axiomatic approach towards the reconciliation of general relativity and quantum mechanics will, I am sure, if pursued vigorously, eventually lead to success.</i> Newtonian cannot be GR and QM. An axiomatic system cannot exceed it weakest axioms. Perturbation treatments - string/M-theory - are particularly defective for excluding new symmetries. Teleparallel gravitation, Einstein <i>et Uncle Alhttps://www.blogger.com/profile/05056804084187606211noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-22886964961045671152011-05-31T11:13:33.135-04:002011-05-31T11:13:33.135-04:00Yes, a very good post, Bee. It sounds like your or...Yes, a very good post, Bee. It sounds like your orientation is slowly changing from a bottom up to a top down orientation. That may be my more optimistic interpretation of your post because that is my own preference. One takes what is useful from the past and builds on it for bottom up work. One uses more visualization from observation of phenomena for the top down approach. The tricky part in Erichttps://www.blogger.com/profile/08213251864943443334noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-10044890822436660282011-05-31T11:11:10.013-04:002011-05-31T11:11:10.013-04:00What is Alain Connes and his crew up to in France....What is Alain Connes and his crew up to in France. Any progress there?<br /><br />"Anytime someone mentions 'The Universe', we must all stand up and bow."<br />... Alain Connes<br /><br />Sounds like my kind of guy. Thanks to Lee Smolin in one of his books for turning me onto that one.Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-18647254206327680772011-05-31T11:08:27.740-04:002011-05-31T11:08:27.740-04:00This comment has been removed by the author.Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-89528800347192447942011-05-31T09:53:48.562-04:002011-05-31T09:53:48.562-04:00ah thanks Bee,
While looking through your blog po...ah thanks Bee,<br /><br />While looking through your <a href="http://backreaction.blogspot.com/2010/10/if-youre-interested-in-phenomenology-of.html" rel="nofollow">blog posts</a><br /><br /><a href="http://www.prime-spot.de/ESQG10/abstracts.html" rel="nofollow">ABSTRACTS - Experimental Search for Quantum Gravity</a><br /><br /><a href="http://www.perimeterinstitute.ca/Events/PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-84268067993018097872011-05-31T09:44:48.947-04:002011-05-31T09:44:48.947-04:00Hi Plato,
Well, basically it's what we discus...Hi Plato,<br /><br />Well, basically it's what we discussed on <a href="http://backreaction.blogspot.com/2010/10/experimental-search-for-quantum-gravity.html" rel="nofollow">last year's workshop</a>, sorry for being repetitive. There's since been progress on the Causal Sets stuff, at least is what I see on the arXiv, inching closer to pheno there, and there's new data from the LHCSabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-32938684329005116672011-05-31T09:28:37.655-04:002011-05-31T09:28:37.655-04:00Bee:Not sure I understand the question. What do yo...<b>Bee</b>:<i>Not sure I understand the question. What do you mean with "correspondences"?</i><br /><br />Some of the phenomenological approaches to testing QG?<br /><br />Best,PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-55018482387170419312011-05-31T09:06:04.045-04:002011-05-31T09:06:04.045-04:00Hi Plato,
Not sure I understand the question. Wha...Hi Plato,<br /><br />Not sure I understand the question. What do you mean with "correspondences"? Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-48009496968242994192011-05-31T09:01:15.385-04:002011-05-31T09:01:15.385-04:00Hi Phil,
I have to admit that when I was a studen...Hi Phil,<br /><br />I have to admit that when I was a student I greatly preferred a deductive way in teaching, ie just writing down the axioms and see what follows. I suppose that's because I started out from mathematics and it just came more naturally. It was only over the course of time that I found that while it underlines the elegance of the theory, it isn't too helpful for doing Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20277347358216902722011-05-31T08:52:15.491-04:002011-05-31T08:52:15.491-04:00Bee....the subject of QG with regard to the phenom...Bee....the subject of QG with regard to the phenomenology of course.<br /><br />What correspondences phenomenology wise do you have to show in the QG area?<br /><br />Best,PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-72975344985117259532011-05-31T08:51:25.845-04:002011-05-31T08:51:25.845-04:00Hi Christine,
Thanks for the correction! Best,
B...Hi Christine,<br /><br />Thanks for the correction! Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-11319899493904613202011-05-31T08:49:01.010-04:002011-05-31T08:49:01.010-04:00Bee:But the question remains if pure thought is su...<b>Bee</b>:<i>But the question remains if pure thought is sufficient to find the right starting point, for there might be more than one, some of which leading to theories incompatible with observations.</i><br /><br />I am glad you are returning to the subject of QG too. What motivation are your inclination for such a search, and you may have your reasons, as I have mine.<br /><br />Showing PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3401610199440389882011-05-31T08:10:33.952-04:002011-05-31T08:10:33.952-04:00energy of photons was quantized
I mean, of course...<i>energy of photons was quantized</i><br /><br />I mean, of course, the energy of the electromagnetic field was quantized, later called photons.<br /><br />Best,<br />ChristineChristine Cordula Dantashttps://www.blogger.com/profile/05271747374185459530noreply@blogger.com