Phys. Rev. Lett. 54, 502–505 (1985)Heterotic StringReceived 21 November 1984; published in the issue dated 11 February 1985 A new type of superstring theory is constructed as a chiral combination of the closed D=26 bosonic and D=10 fermionic strings. The theory is supersymmetric, Lorentz invariant, and free of tachyons. Consistency requires the gauge group to be Spin(32)/Z2 or E8×E8. © 1985 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.54.502
DOI:
10.1103/PhysRevLett.54.502
PACS:
11.30.Pb, 11.30.Ly, 12.10.En
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