indico  First event Previous event OKC/Nordita High-Energy Physics Theory seminar Next event Last event   | view:  |  manage export to personal scheduler  | 
user login 


Mean-field quantization of bosonic string
  OKC/Nordita High-Energy Physics Theory seminar

Monday 04 December 2017
from 13:15 to 14:15
at 132:028 (Nordita East)
Speaker : Yuri Makeenko (ITEP, Moscow)
Abstract : It is known since 1980s that both conformal field theory technique and lattice regularizations of a quantum string work only in the target-space dimension d<2. As we have shown recently with Jan Ambjorn, the usual classical string vacuum is unstable for d>2, where another quantum vacuum state has lower energy and is stable under fluctuations for d<26. I construct it in the mean-field approximation which is analogous to solving the sigma-model at large N and show how the results known from canonical quantization are reproduced. This requires a very special scaling limit whose existence is due to the fact that the worldsheet metric becomes singular when the cutoff is removed.

Nordita  | Last modified 02 December 2017 20:18  |  HELP