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- R Marotta, F Nicodemi, R Pettorino, F Pezzella, F Sannino
- 2002

We study a bound state of fractional D3-branes localized inside the world-volume of fractional D7-branes on the orbifold C 3 /(Z 2 × Z 2). We determine the open string spectrum that leads to N = 1 U (N 1) × U (N 2) × U (N 3) × U (N 4) gauge theory with matter having the number of D7-branes as a flavor index. We derive the linearized boundary action of the… (More)

- G Cristofano, G Maiella, R Musto, F Nicodemi
- 1994

By using the explicit knowledge of the lowest energy single particle wave functions in the presence of an arbitrary magnetic field, we extend to the case of a torus Jain's idea of looking at the FQHE as a manifestation of an integer effect for composite fermions. We show that this can be realized thanks to a redefinition of the vacuum state that is… (More)

- Francesco Cuomo, Raffaele Marotta, Francesco Nicodemi, Roberto Pettorino, Franco Pezzella, Gianluca Sabella
- 2000

We compute off-shell three-and four-tachyon amplitudes at tree level by using a prescription based on the requirement of projective invariance. In particular we show that the off-shell four tachyon amplitude can be put in the same form as the corresponding on-shell one, exhibiting therefore the same analyticity properties. This is shown both for the bosonic… (More)

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