A great review of Einstein’s contributions to cosmology. Understanding the history of a field is essential to understanding the evolution of ideas therein. I had not realized how rigorous Einstein had been in deriving his cosmological models. It is much
Time Crystals and Digital Physics
Recently, experiments have been conducted that verify the existence of a state of matter that is called a discrete time crystal. This type of material has a perfect repetition across time, which means that it acts like a Perpetuum Mobile