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Informal Pizaa SeminarOn the nature and stability of Cosmic StringsLouis LeblondCornellWe review the basic idea of brane inflation with emphasis on cosmic strings (codimension 2 defect) production and stability. The question of their stability is crucial to determine if their could be any detectable signatures coming from these defects. Within the tachyon condensation approach we show that a D(p-2) brane is stable inside a Dp brane when the bulk is compactified. We argue that the tachyon mass is lifted by its interaction with the induced background gauge and RR field. We then solve the equation of motion for this system and find vortex solutions which we interpret as being what a D(p-2) brane become once it gets inside a Dp brane. Similar behavior would be expected for other kind of comics strings from the various string dualities.
Tuesday, May 11th 2004, 13:00
Ernest Rutherford Physics Building, room 326 |