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We derive type IIB vacua which are very promising to put string theory toexperimental test. These are Calabi-Yau compactifications with a 4D fibrationover a 2D base. The moduli are fixed in such a way to obtain a very anisotropicconfiguration where the size of the 2D base is exponentially larger than thesize of the 4D fibre. These provide stringy realisations of the supersymmetriclarge extra dimensions scenario and extensions of the ADD scenario which arecharacterised by TeV-scale strings and two micron-sized extra dimensions. Wealso study the phenomenological properties of hidden Abelian gauge bosons whichmix kinetically with the ordinary photon and get a mass via the Green-Schwarzmechanism. We show that anisotropic compactifications lead naturally to darkforces for an intermediate string scale or even to a hidden CMB for the extremecase of TeV-scale strings.

Large extra dimensions and light hidden photons from anisotropic string vacua