tag:blogger.com,1999:blog-5439168179960787195.post9066932300399143123..comments2024-03-28T17:13:01.117+10:00Comments on Condensed concepts: Is DMFT "the only game in town"?Ross H. McKenziehttp://www.blogger.com/profile/09950455939572097456noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-5439168179960787195.post-49457246994484193862015-03-09T15:18:51.669+10:002015-03-09T15:18:51.669+10:00Ravindra,
Thanks for making this important point....Ravindra,<br /><br />Thanks for making this important point. <br /><br />The reason I have no such comparison is that I am unaware of a non-DMFT calculation [besides a brute force "black box" numerical approach] that can even qualitatively reproduce the data. Specifically, one needs to produce a Drude peak at zero frequency AND the broad feature associated with the Hubbard bands, AND have the Drude peak collapse as the temperature is increased. If someone knows such an approximation scheme, please point it out.<br /><br />However, I should stress that my main point is NOT that DMFT is great. Rather, it is that DMFT is not like string theory and we have a pretty good idea of situations in which it works well.Ross H. McKenziehttps://www.blogger.com/profile/09950455939572097456noreply@blogger.comtag:blogger.com,1999:blog-5439168179960787195.post-82739456559947611872015-03-09T15:13:31.763+10:002015-03-09T15:13:31.763+10:00I stand by my claim.
I am looking for a paper in ...I stand by my claim.<br /><br />I am looking for a paper in a Physical Review journal that compares actual experimental data with a specific prediction from string theory.<br /><br />In contrast, in the post I gave one example of a PRL paper that contained a comparison of experimental data with a DMFT calculation.Ross H. McKenziehttps://www.blogger.com/profile/09950455939572097456noreply@blogger.comtag:blogger.com,1999:blog-5439168179960787195.post-90815090757929052602015-03-07T09:05:30.577+10:002015-03-07T09:05:30.577+10:00For a better comparision of the success of DMFT to...For a better comparision of the success of DMFT to experiment, you could also show the non-DMFT calculations of the optical conductivity to illustrate how that presumably fails to match experiment.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5439168179960787195.post-6633506472035490652015-03-06T23:06:38.753+10:002015-03-06T23:06:38.753+10:00'Most importantly, there are no known comparis...'Most importantly, there are no known comparisons between experimental data and string theory." String theory with the infinite nature hypothesis might predict the string landscape. However, let us assume 2 things: (1) String vibrations are confined to 3 copies of the Leech lattice.<br />(2) Nature is finite and digital; the maximum physical wavelength equals the Planck length times the Fredkin-Wolfram constant.<br />I claim that string theory with these two new hypotheses does indeed predict the Fernández-Rañada-Milgrom effect, the Space Roar Profile Prediction, and the 64 Particles Hypothesis. Google "peter woit fqxi essay contest 2015" and read my comment on Peter Woit's essay.David Brownhttps://www.blogger.com/profile/10537922851243581921noreply@blogger.com