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- W87846977 abstract "This talk is based on work made with L. Magnea and R. Russo [1]. We give an explicit expression of the multiloop partition function of open bosonic string theory in the presence of a constant gauge field strength. The Schottky parametrization allows to perform the field theory limit, which at two-loop level reproduces the Euler-Heisenberg effective action for adjoint scalars minimally coupled to the background gauge field. String theory achievements are very impressive: maybe the most important is that the consistency between quantum mechanics and special relativity in the description of the motion of a string implies the presence of gravitons (and of their supersimmetric partners) and therefore yields a consistent quantum theory of (super)gravity. But the richness (and the problems) of string theory as a fundamental theory cannot be discussed now; here we will take a much more modest attitude just looking to string theory as a natural and very fruitful embedding for Quantum Field Theory; open strings, in particular, represent a natural generalization of charged particles since they couple, through their endpoints, to gauge fields. A peculiar feature of this embedding is open-closed string duality: exchanging the role of the worldsheet coordinates τ and σ, an annulus spanned by the time evolution of an open string can also be seen as a cylinder described by free propagation of a closed string. This property has far reaching consequences as it relates gravity (described by closed strings) with Yang Mills theories (open strings); here we will use it only as a technical device for computing open string amplitudes not otherwise accessible." @default.
- W87846977 created "2016-06-24" @default.
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- W87846977 date "2005-09-03" @default.
- W87846977 modified "2023-09-27" @default.
- W87846977 title "Charged open strings in a background field and Euler-Heisenberg effective action ∗ ." @default.
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- W87846977 hasPublicationYear "2005" @default.
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