This is a unit which is very large, about equivalent to 1023 solar masses squeezed into the space of a single atomic nucleus. At one unit of Planck time after the Big Bang, the mass density of the universe is thought to have been approximately one unit of Planck density.
The hyperbolic geometry of the universe and the wedding of general relativity theory to quantum theory.(Report)
Mar 01, 2012; I. INTRODUCTION The shape of the universe is still unknown. It depends on the curvature k (the field strength) according to the...