Decoherence in an Isolated Macroscopic Quantum System: A Parameter-Free Model Involving Gravity

Abstract

We will present here a proposal about how gravitation can contribute to produce the appropriate decoherence. Our model is restricted to the range of weak gravitational fields and non-relativistic velocities, in a somehow semiclassical limit of a “hypothetical” quantum gravity. We so elude all the huge difficulties entailed in superstrings, superoperators, subquantum world, quantum cosmology, etc. Despite the simplicity of the model, one can extract some important conclusions about the emergence of classical and quantum behaviour, the measurement problem, the question of mesoscopic bodies, etc.