View Single Post
tom.stoer
tom.stoer is offline
#23
Mar4-12, 08:42 AM
Sci Advisor
P: 5,307
The FRW metric can definitly not be derived using flat space + perturbative strings; I don't know which realistic vacuum solutions have been constructed so far, but AdS is not the right way to go b/c AdS is not realistic; with a positive cosmological constant one needs dS instead, for FRW w/o cc again something different.