Technically natural cosmological constant from supersymmetric 6D brane backreaction

We provide an explicit example of a higher-dimensional model describing a non-supersymmetric spectrum of 4D particles of mass M, whose 4D geometry – including loop effects – has a curvature that is of order R∼mKK4/Mp2, where mKK is the extra-dimensional Kaluza–Klein scale and Mp is the 4D Planck constant. mKK is stabilized and can in particular satisfy mKK≪M. The system consists of a (5+1)-dimensional model with a flux-stabilized supersymmetric …