Conformal general relativity contains the quantum
  Based on the de Broglie-Bohm relativistic quantum theory of motion we show that the conformal formulation of general relativity, being linked with a Weyl-integrable geometry, may implicitly contain the quantum effects of matter. In this context the Mach's principle is discussed. 
R. Bonal, I. Quiros and R. Cardenas (Departamento de Fisica,   Universidad Central de Las Villas, Santa Clara, Villa Clara, ...