BPS states carrying fermionic brane charges

The Green-Siegel central extension of superalgebras for BPS branes is studi ed. In these cases commutators of usual bosonic brane charges only with the broken supersymmetry charges allow this central extension. We present an i nterpretation of these fermionic central charges as fermionic brane charges , and show that they take nonzero values for a nontrivial fermionic boundar y condition. Such fermionic coordinates solutions are determined by equatio ns of motion in a suitable gauge condition which manifests Nambu-Goldstone fermionic modes as well as bosonic modes in the static gauge. We also show that some modes of dilatino fields couple with the fermionic brane currents . (C) 2000 Elsevier Science B.V. All rights reserved.