Colloquia

We introduce the concept of kinematical algebras and their associated homogeneous spaces where our physical theories live. Some of these algebras are related via Lie algebra contraction. We develop a framework that captures systematically the corrections to the contraction procedure, for example the non-relativistic corrections of order v/c, by ...

Diverse astrophysical and cosmological observations indicate that most of the matter in the Universe is cold, dark and non-baryonic. Traditionally the most popular dark matter candidates have been new elementary particles, such as WIMPs and axions. However Primordial Black Holes (PBHs), black holes formed from over densities in the early ...