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Paper detail

Seven Sphere and the Exceptional Nonlinear Superconformal Algebras

The realizations of the exceptional non-linear (quadratically generated, or W-type) N=8 and N=7 superconformal algebras with Spin(7) and G_2 affine symmetry currents are reviewed. Both the N=8 and N=7 algebras admit unitary realizations in terms of a single boson and free fermions in 8 of Spin(7) and 7 of G_2, with the central charges c=26/5 and c=5, respectively. They also have realizations over the coset spaces SO(8)XU(1)/SO(7) and SO(7)X U(1)/G_2 for some fixed values of their central charges. The coset space SO(8)/SO(7) is the seven-sphere , whereas the space SO(7)/G_2 represents the seven-sphere with torsion. We conclude with a discussion of a novel 'hybrid' method developed recently that yields unitary realizations of the exceptional N=8 and N=7 algebras for all allowed values of their central charges.

preprint1997arXivOpen access
Murat Gunaydin
hep-th
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Murat Gunaydin

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