tag:blogger.com,1999:blog-22973357.post5181945320326448146..comments2021-05-14T20:01:50.509-04:00Comments on Sabine Hossenfelder: Backreaction: Advent calendar #11: Prescient EinsteinSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger13125tag:blogger.com,1999:blog-22973357.post-30086692192489905712011-12-12T22:42:08.804-05:002011-12-12T22:42:08.804-05:00I am looking for modeling of physical objects usin...I am looking for modeling of physical objects using discrete Lie symmetries, and discussions of the relationships among Lie groups, conformal dilation symmetry and self-similarity.<br /><br />Perhaps a misguided search, or perhaps one that as yet has no path to glory.<br /><br />Thanks for your suggestions, which I will duly consider.<br /><br />RLORobert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-4706129674599877142011-12-12T12:16:02.578-05:002011-12-12T12:16:02.578-05:00Yeap he has one chapter devoted to Lie Groups and ...Yeap he has one chapter devoted to Lie Groups and algebras.Giotishttps://www.blogger.com/profile/03594944884584261018noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-30506298166330805782011-12-12T01:46:24.420-05:002011-12-12T01:46:24.420-05:00Hi Robert,
There is of course Georgi's book, ...Hi Robert,<br /><br /><a href="http://www.amazon.com/Lie-Algebras-Particle-Physics-Frontiers/dp/0738202339" rel="nofollow">There is of course Georgi's book</a>, but probably too technical for your purposes. I am trying to recall if Baez' "Gauge fields, Knots, and Gravity" has something to say about Lie groups & algebras. I'd think it should, but I can't recall, and ISabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-67204097517805955772011-12-12T00:05:38.325-05:002011-12-12T00:05:38.325-05:00The En lattice gives solutions to the lattice pack...The En lattice gives solutions to the lattice packing problem and the kissing number problem in n dimensions. Lattice packing is type of sphere packings, where the spheres are centered at the points of a lattice. It is known that this is the maximum density that can be achieved by a lattice packing in 8 dimensions. The physical interpretation of this packing is, it describes the tightest packing Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-49059579358936710722011-12-11T18:43:36.108-05:002011-12-11T18:43:36.108-05:00Last week I downloaded the Wikipedia blurb on Lie ...Last week I downloaded the Wikipedia blurb on Lie groups, but found it a bit technical for what I was after (a more conceptual discussion of algebraic approaches in physics).<br /><br />Are there any accurate, but also accessible, dicussions of Lie Groups and discrete Lie symmetries that anyone can point me towards?<br /><br />RLORobert L. Oldershawhttps://www.blogger.com/profile/15396555790655312393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-50729398946549381122011-12-11T14:47:07.721-05:002011-12-11T14:47:07.721-05:00/*..Actually, I was quite surprised that he knew w.../*..Actually, I was quite surprised that he knew who Lie was..*/ <br />Actually, I would be quite surprised if anyone here knew, what the Lie group is (I mean the geometric meaning of it).Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3924312420361549782011-12-11T13:06:52.968-05:002011-12-11T13:06:52.968-05:00Hi Bee,
Most certainly agreed and thus is why Ein...Hi Bee,<br /><br />Most certainly agreed and thus is why Einstein referred to such as being “holy curiosity”, that is as opposed to belief to which such thing are so often associated, rather as to reflect one’s commitment respective of the utility of holding to such a philosophy. That is in a nutshell for me what binds science to be consistent with being a philosophy, not so much dependant on Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-56273693988193428912011-12-11T12:08:11.224-05:002011-12-11T12:08:11.224-05:00Hi Phil,
Yes, questioning and curiosity are essen...Hi Phil,<br /><br />Yes, questioning and curiosity are essential to science. But they have to be accompanied by the willingness to work hard to answer the questions. Otherwise we'd still be curious what the stars are made of. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-71293241909851479002011-12-11T11:38:41.189-05:002011-12-11T11:38:41.189-05:00Hi Giotis,
Ha, yes, that was very to the point :o...Hi Giotis,<br /><br />Ha, yes, that was very to the point :o) Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-61413187927815626262011-12-11T09:10:06.629-05:002011-12-11T09:10:06.629-05:00Hi Bee,
I guess it’s the way one looks at things ...Hi Bee,<br /><br />I guess it’s the way one looks at things which would have this story to be depressing or not. That is what this has me mindful of is that Einstein had a full share of life as it relates to quality. He had reached a level of success achieved by few , yet also in his lifetime suffered many tragedies and forced to make decisions so dreadful which fortunately for most of us willPhil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-71593789639283324252011-12-11T05:50:48.950-05:002011-12-11T05:50:48.950-05:00And something to cheer up.
The funniest thing I r...And something to cheer up.<br /><br />The funniest thing I read in a paper and an excellent piece of self-sarcasm:<br /><br />Since the dawn of time, humankind has wondered, "what is the potential on the Coulomb branch of the conifold gauge theory, and what are the consequences for models of D-brane inflation?" In this paper, we continue this quest.<br /><br /><br />http://arxiv.org/Giotishttps://www.blogger.com/profile/03594944884584261018noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-66611795865372520752011-12-11T05:03:20.767-05:002011-12-11T05:03:20.767-05:00If you think that is depressing, wait for the stor...If you think that is depressing, wait for the story on Tuesday... but don't worry, we have some more amusing ones to come too.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-42663227748853455042011-12-11T04:55:36.542-05:002011-12-11T04:55:36.542-05:00depressing storydepressing storyGiotishttps://www.blogger.com/profile/03594944884584261018noreply@blogger.com