Gravitational decoherence: A thematic overview

Gravitational decoherence (GD) refers to the effects of gravity in actuating classical appearance a quantum system. Because underlying processes involve issues general relativity (GR), field theory (QFT), and information, GD has fundamental theoretical significance. There is great variety models, many them involving physics that diverge from GR and/or QFT. This overview two specific goals along with one central theme: (i) present theories based on QFT explore their experimental predictions; (ii) place other under scrutiny QFT, point out differences. We also describe how experiments space coming decades can provide evidence at levels: (a) discriminate alternative non-GR theories; (b) discern whether or an effective theory.