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- W2036554114 abstract "Reduction of the ten-dimensional, heterotic-superstring effective action Ŝ, including quartic higher-derivative terms , yields a physical four-action S which is tachyon-free up to quadratic order 2—the masses M0 and M2 of the spin-0 and spin-2 particles are both real—when the internal six-space is a Calabi–Yau metric μν and N = 1 supersymmetry is preserved via the equation d ≡ tr( ∧ ) − Tr( ∧ )/30 = 0, where μνξ is the totally antisymmetric three-index field (while the bosonic string and type-II superstring may contain a spin-2 tachyon and a spin-0 tachyon, respectively). Here, we show that this crucial feature is independent of imposing supersymmetry, for if d ≠ 0, there is an additional contribution to 2 which, however, produces no tachyons. Thus, the requirement of a stable, causal theory singles out the heterotic superstring irrespective of the requirement of N = 1 supersymmetry, which is essential at high energies rather for its roles in the vanishing of the cosmological constant and the maintenance of the gauge hierarchy." @default.
- W2036554114 created "2016-06-24" @default.
- W2036554114 creator A5000864896 @default.
- W2036554114 date "2003-05-23" @default.
- W2036554114 modified "2023-09-27" @default.
- W2036554114 title "Causality and supersymmetry in the superstring theory" @default.
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- W2036554114 doi "https://doi.org/10.1088/0264-9381/20/13/301" @default.
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