Speaker
Ioannis Florakis
(MPI Physik)
Description
I will present a new class of N=2 amplitudes in string theory, generalizing the well-known F-terms which compute the topological string theory partition function. These generalized F-terms involve, in addition to the standard anti-self-dual graviphoton background, additional insertions of self-dual vertices. The latter can be identified, using the non-trivial constraint that the correct N = 2 gauge theory partition function be recovered in the field theory limit, both perturbative and non-perturbatively. The structure of the amplitudes opens up the possibility of expressing them as correlators in a topological string theory, hence leading to a worldsheet definition of the refined topological string.
Primary author
Ioannis Florakis
(MPI Physik)
