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# Lilia Anguelova : R^4 Corrections and Flux Superpotential in Heterotic M-theory

I will describe two kinds of corrections to the previously known effective action of heterotic M-theory. The first is due to taking into account the 11d R^4 term. This results in a new contribution to the Kahler potential of the four-dimensional effective theory. The second comes from the flux-generated superpotential. To derive systematically the form of this superpotential, one has to use the approach of group structures. It is essential to consider SU(3), not G_2, structure on the internal 7d manifold. Finally, I will address the issue of how these corrections affect the existence of dS vacua in heterotic M-theory, which were originally found by balancing open membrane instanton effects and gaugino condensation.

**Category**: String Theory**Duration**: 01:19:59**Date**: February 16, 2006 at 2:45 PM**Views**: 31-
**Tags:**seminar, String Theory Seminar

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