4-D homogeneous isotropic cosmological models generated by the 5-D vacuum

4-Dimensional BF Theory as a Topological Quantum Field Theory

4-Dimensional Einstein Theory Extended by a 3-Dimensional Chern-Simons Term

4-Dimensional General Relativity from the instrinsic spatial geometry of SO(3) Yang--Mills theory

4-Dimensional Kaluza-Klein Approach to General Relativity in the (2,2)-Splitting of Spacetimes

4-Dimensional optics, an alternative to relativity

4-dimensional Spin-foam Model with Quantum Lorentz Group

4d Deformed Special Relativity from Group Field Theories

4D diffeomorphisms in canonical gravity and abelian deformations

4d Lorentzian Holst action with topological terms

4d neutral dilatonic black holes and (4+p) dimensional nondilatonic black p-branes

4D quantum black hole physics from 2D models?

4D spacetimes embedded in 5D light-like Kasner universes

4D static solutions with interacting phantom fields

4D Wormhole with Signature Change in the Presence of Extra Dimensions