tag:blogger.com,1999:blog-22973357.post114565632660882703..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Why the Quark Gluon Plasma is a BananaSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-22973357.post-1151047957010867272006-06-23T03:32:00.000-04:002006-06-23T03:32:00.000-04:00Thanks for the quick response.Already read that. ...Thanks for the quick response.<BR/><BR/>Already read that. It's patterned after the one they did at the RHIC.<BR/><BR/>They overlook many things, but I'll let you go get married, and we can go over it after you get back.<BR/><BR/>Here's a philosophical question, though. If it were possible to calculate the 'risk' associated with creating a 'deadly strangelet', etc., and it came out to be exaclyAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1151010648078308822006-06-22T17:10:00.000-04:002006-06-22T17:10:00.000-04:00Dear Dr. Walter L. Wagner,Study of potentially dan...Dear Dr. Walter L. Wagner,<BR/><BR/><A HREF="http://doc.cern.ch/yellowrep/2003/2003-001/p1.pdf" REL="nofollow">Study of potentially dangerous events during heavy-ion collisions at the LHC: Report of the LHC Safety Study Group</A><BR/><BR/>See Chapter 2. Strangelets.<BR/><BR/>Sorry for the brief answer. Have to go get married now ;-) Best,<BR/><BR/>B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1151006034354262492006-06-22T15:53:00.000-04:002006-06-22T15:53:00.000-04:00Dear Bee:Congratulations on your wedding. I suppo...Dear Bee:<BR/><BR/>Congratulations on your wedding. I suppose you'll be on your honeymoon and won't get this for a while. Hope you're not too 'changed' to reply back!<BR/><BR/>It's interesting that the QGC can be equated to a mini black hole. Of course, that is essentially what Hawking's theory of evaporating mini black holes implies.<BR/><BR/>Way back when (1999) I wrote a brief letter to Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1146087288960974662006-04-26T17:34:00.000-04:002006-04-26T17:34:00.000-04:00BTW, I just have seen - there is a feature article...BTW, I just have seen - there is a <A HREF="http://www.sciam.com/article.cfm?articleID=0009A312-037F-1448-837F83414B7F014D&ref=sciam&chanID=sa006" REL="nofollow">feature article</A> about the quark-gluon plasma and the RHIC experimental results in the may issue of the Scientific American, <I>The First Few Microseconds</I>, by Michael Riordan and William A. Zajc. Zajc is the spokesman of the stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1145911726368369222006-04-24T16:48:00.000-04:002006-04-24T16:48:00.000-04:00Hi pavel, and bee,thank you for these quick answer...Hi pavel, and bee,<BR/><BR/><BR/>thank you for these quick answers from SB :-)<BR/>I guess I will have to look up some elementary SUSY stuff, to understand these possible particle contents for the different N's...<BR/><BR/>So, in this AdS/CFT correspondence, the conformality of the QFT is not so important? The big thing is that the 3+1d QFT is defined on some boundary of the AdS, and that the stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1145907690415046712006-04-24T15:41:00.000-04:002006-04-24T15:41:00.000-04:00Hi Stefan,for whatever reasons the viscosity issue...Hi Stefan,<BR/><BR/>for whatever reasons the viscosity issue always confuses people. Here is how I understand it: viscosity is the ability of a fluid to drag along layers while flowing. A large viscosity means the fluid does not easily drag along layers. It does not flow that easily and is 'thick', like honey or so. <BR/><BR/>On the other hand, a strong coupling in the medium allows to drag alongSabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1145906731329236422006-04-24T15:25:00.000-04:002006-04-24T15:25:00.000-04:00in "N=4 super Yang-Mills", N counts the amount of ...in "N=4 super Yang-Mills", N counts the amount of supersymmetry. minimal susy has N=1, that is one conserved charge which is a Lorentz spinor. large-N limit in AdS/CFT refers to the usual number of colors for SU(N).<BR/>conformal invariance of N=4 SYM is not essential for AdS/CFT to work: there are other non-conformal field theories whose dual description involves black holes in AdS. it's just Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1145835825015404972006-04-23T19:43:00.000-04:002006-04-23T19:43:00.000-04:00Dear Bee, thank you a lot for this very interestin...Dear Bee, <BR/><BR/><BR/>thank you a lot for this very interesting post and all the references and links you have collected! This is a topic I would like to know more about, and I will try to follow up some of the papers you have mentioned. It is funny to see that the abstract reasoning about black holes in anti-de Sitter space seems to have some relevance for down-to-earth heavy ion physics! <BRstefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.com