A Probability Density for Modeling Unknown Physical Processes
  This brief paper develops a probability density that models processes for which the physical mechanism is unknown. It has desirable properties which are not realized by densities derived from Gaussian process or other classic methods. In many areas of physics, such the analysis of chaotic phenomena, there is need for a density that has these properties. 
Steven C. Gustafson and Adam C. Hillier
physics.gen-ph