U(1)_R mediation in 6D brane-world gauged supergravity

          @misc{ scivideos_PIRSA:08060085,
            doi = {10.48660/08060085},
            url = {https://pirsa.org/08060085},
            author = {Lee, Hyun Min},
            keywords = {Quantum Fields and Strings, Particle Physics, Cosmology},
            language = {en},
            title = {U(1)_R mediation in 6D brane-world gauged supergravity},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2008},
            month = {jun},
            note = {PIRSA:08060085 see, \url{https://scivideos.org/pirsa/08060085}}
          }
          

Abstract

We construct a consistent supersymmetric action for chiral and vector multiplets living on codimension-two branes in a six-dimensional chiral gauged supergravity. A nonzero brane tension can be compatible with the bulk supersymmetry by introducing a brane-localized Fayet-Iliopoulos term proportional to the brane tension. Moreover, we show that a brane chiral multiplet with nonzero R charge has a nontrivial coupling to the extra component of the U(1)_R gauge field strength and a singular scalar self-interaction term. We find that a unwarped football solution with 4D Minkowski vacuum exists for arbitrary brane tension and it preserves 4D N=1 supersymmetry. Dimensionally reducing to 4D for the football solution, we obtain the low energy action for moduli and brane multiplets in 4D effective supergravity with gauged U(1)_R. By assuming the bulk gaugino condensates as well as nonzero brane F- and/or D-term for the uplifting potential, we have all the moduli stabilized with a vanishing cosmological constant. The brane scalar with nonzero R charge then gets a soft mass of order the gravitino mass, the sign of which depends on the sign of the R charge as well as whether the brane F- or D-term dominates.