The Twofold Existence of Particles and Nuclei

This Book contains a new proposal for physics within more than four dimensions (3 spatial dimensions + 1 time coordinate). An extra space is introduced called basic space instead of extra dimensions compactified or otherwise embedded in space-time.A dual space concept has been applied by the author to construct models of particles photons and nuclei mainly in a bottom -- up process. The top - down reasoning the dominating method in theoretical physics is only used in a second step.The kind of twofold existence discussed in this book turns out to be useful for describing natural systems in the living and non-living world.