Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sciam.255...48g&link_type=abstract
Scientific American (ISSN 0036-8733), vol. 255, Sept. 1986, p. 48-60.
Physics
10
Elementary Particles, Field Theory (Physics), Quantum Theory, String Theory, Gravitation Theory, Relativity, Supersymmetry
Scientific paper
Superstring theory treats elementary particles as harmonics of strings 10 to the -35 m long. The gravity model in the theory expands the universe to nine spatial dimensions and time, with all motion following geodesic lines and only four dimensions ever being observable. The possible configurations of a field of strings in space would be more numerous than all points in space, which leads to a new concept of space in which strings are wavelike disturbances. Certain disturbances produce gravity through the medium of the massless spin-2 graviton, which is actually two strings joined end to end and vibrating. Strings move across world sheets of minimum area, and closed strings, i.e., strings with open ends attached to one another, travel world sheets that touch the string at its starting point and at its end in spacetime. The nine spatial dimensions of the theory permit chirality, which provides agreement with calculations of the Yang-Mills forces. Directions being taken in further theoretical research are summarized, along with possible venues for experimental verification.
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