Chaos in the Galactic Dynamics

An elementary survey of cosmic chaos, its origins, and its physical impact in an open and multiply connected universe is given. A new type of cosmic evolution by global metrical deformations, unpredicted by Einstein's equations, is pointed out. The uniformity and the inhomogeneities of the galactic background are discussed in this context. There is a finite region in the open 3-space in which the galactic world-lines are chaotic, and the mixing taking place in this chaotic nucleus of the universe provides a mechanism to create the galactic equidistribution. We review in a completely untechnical way how global metrical deformations of space-time cause particle creation in quantum fields, and induce angular fluctuations in the temperature of the cosmic microwave background radiation. They can generate topology changes without distorting the constant curvature of the 3-space. The micro-topology causes parity violation (i.e., a violation of the space-reflection symmetry) by self-interference.