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Brane fusion in the bosonic string and the emergence of fermionic strings

Englert, F.; Houart, L.; Taormina, A.


F. Englert

L. Houart


We review the emergence of the ten-dimensional fermionic closed string theories from subspaces of the Hilbert space of the 26-dimensional bosonic closed string theory compactified on an E8 × SO(16) lattice. They arise from a consistent truncation procedure which generates space-time fermions out of bosons. This procedure is extended to open string sectors. We prove that truncation of the unique tadpole-free SO(213) bosonic string theory compactified on the above lattice determines the anomaly free Chan-Paton group of the type-I theory and the consistent Chan-Paton groups of type-O theories. It also predicts the tension of space-filling D-branes in these fermionic theories. The derivation of these fermionic string properties from bosonic considerations alone points towards a dynamical origin of the truncation process. Space-time fermions and supersymmetries would then arise from bosonic degrees of freedom and no fermionic degrees of freedom would be needed in a fundamental theory of quantum gravity.


Englert, F., Houart, L., & Taormina, A. (2001). Brane fusion in the bosonic string and the emergence of fermionic strings. Journal of High Energy Physics, 2001(08),

Journal Article Type Article
Publication Date Aug 1, 2001
Deposit Date Apr 23, 2007
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Electronic ISSN 1029-8479
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2001
Issue 08
Keywords Bosonic strings, Superstrings, Heterotic strings, D-branes.