Some articles on :
... Before the so-called "duality revolution" there were believed to be five distinct versions of string theory, plus the (unstable) bosonic and gluonic theories ... String Theories Type Spacetime dimensions Details Bosonic 26 Only bosons, no fermions means only forces, no matter, with both open and closed strings major flaw a particle with imaginary mass, called the tachyon, representing an instability in the theory ...
Famous quotes containing the words symmetry and/or group:
“What makes a regiment of soldiers a more noble object of view than the same mass of mob? Their arms, their dresses, their banners, and the art and artificial symmetry of their position and movements.”
—George Gordon Noel Byron (17881824)
“With a group of bankers I always had the feeling that success was measured by the extent one gave nothing away.”
—Francis Aungier, Pakenham, 7th Earl Longford (b. 1905)