mcgrew (sm62704) writes "New Scientist is reporting that
"a new study suggests it may be difficult to reconcile string theory with the widely accepted theory of inflation, which explains several key cosmological observations — such as why the universe appears to have the same properties in whichever direction astronomers look.
The study was carried out by a team of researchers led by Mark Hertzberg of MIT in Cambridge, US. The team tried to produce inflation in three versions of string theory in which the extra dimensions are shaped like a doughnut — the simplest possibility. But they found that the conditions needed for inflation appear to be impossible to achieve in these simple versions.