Ultra-Relativistic Energy Density Inflation of Astrophysical Bodies into Apparent Black Holes

1. Abstract In this note, an interesting result of relativistic effects between inertial reference frames is pointed out: to observers at rest in one inertial frame, objects in another inertial frame approaching or receding differentially close to the speed of light, relative to the inertial rest frame, will appear to experience both significant mass inflation and length contraction, resulting in greatly inflated observed energy densities. This note determines, in the view of the observer in the rest frame, the respective Lorentz factors above which an arbitrary spherical object will appear to attain a black hole density and an apparent Planck density.