Quantized scalar field as DM: the axion's case

摘要

We derive a rough estimation of the radius and the mass of a self-gravitating system made of axions. The system is a stationary solution of the Einstein-Klein-Gordon equations with a source term given by the vacuum expectation value of the energy-momentum operator constructed from the axion field. We found that such system would have masses of the order of asteroids (— 10-10MG) and radius of the order of few centimeters. Some implications of such type of objects are discussed.