Gianluca Sabella - Academia.edu (original) (raw)
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Università degli Studi "La Sapienza" di Roma
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Papers by Gianluca Sabella
Nuclear Physics B, 2001
We study the world volume action of fractional Dp-branes of type IIA string theory compactified o... more We study the world volume action of fractional Dp-branes of type IIA string theory compactified on the orbifold T 4 /Z 2. The geometric relation between these branes and wrapped branes is investigated using conformal techniques. In particular we examine in detail various scattering amplitudes and find that the leading low-energy interactions are consistent with the boundary action derived geometrically.
2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
ABSTRACT
Modern Physics Letters A, 2001
We compute off-shell three- and four-tachyon amplitudes at tree level by using a prescription bas... more 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 and for the fermionic strings. The result obtained in the latter case can be extended to the off-shell four-tachyon amplitude in type 0 theory.
Nucl Phys B, 2001
We study the world volume action of fractional Dp-branes of type IIA string theory compactified o... more We study the world volume action of fractional Dp-branes of type IIA string theory compactified on the orbifold T 4 /Z 2. The geometric relation between these branes and wrapped branes is investigated using conformal techniques. In particular we examine in detail various scattering amplitudes and find that the leading low-energy interactions are consistent with the boundary action derived geometrically.
Nuclear Physics B, 2001
We study the world volume action of fractional Dp-branes of type IIA string theory compactified o... more We study the world volume action of fractional Dp-branes of type IIA string theory compactified on the orbifold T 4 /Z 2. The geometric relation between these branes and wrapped branes is investigated using conformal techniques. In particular we examine in detail various scattering amplitudes and find that the leading low-energy interactions are consistent with the boundary action derived geometrically.
2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
ABSTRACT
Modern Physics Letters A, 2001
We compute off-shell three- and four-tachyon amplitudes at tree level by using a prescription bas... more 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 and for the fermionic strings. The result obtained in the latter case can be extended to the off-shell four-tachyon amplitude in type 0 theory.
Nucl Phys B, 2001
We study the world volume action of fractional Dp-branes of type IIA string theory compactified o... more We study the world volume action of fractional Dp-branes of type IIA string theory compactified on the orbifold T 4 /Z 2. The geometric relation between these branes and wrapped branes is investigated using conformal techniques. In particular we examine in detail various scattering amplitudes and find that the leading low-energy interactions are consistent with the boundary action derived geometrically.