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Q‐branes in type IIB supergravity
Author(s) -
Bergshoeff E.A.,
Hartong J.,
Sorokin D.
Publication year - 2008
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/prop.200810550
Subject(s) - instanton , supergravity , physics , brane cosmology , mathematical physics , brane , type (biology) , supersymmetry , biology , ecology
The notion of Q7‐branes and Q‐instantons is introduced. These are one‐half BPS solutions of the type IIB supergravity theory characterized by a set of three parameters p,q,r such that r^2>4pq. The numbers p,q,r parameterize the electric and magnetic couplings of, respectively, the Q7‐branes and Q‐instantons to a triplet of 8‐forms. The (p,q) 7‐branes and instantons including the D7‐brane and the D‐instanton have r 2 = 4pq. Seven‐brane solutions containing Q7‐branes are discussed and the Q‐instanton on‐shell action is computed. The Q7‐branes are either novel bound states of a (p,q) 7‐brane and a (p′,q′) 7‐brane with (p,q) ≠ (p′,q′) or they form an independent new object in the theory.