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In a work by Visser, Bassett and Liberati (VBL) [Nucl. Phys. B (Proc. Suppl.)88, 267 (2000)] a relation was suggested between a null energy condition andthe censorship of superluminal behaviour. Their result was soon challenged byGao and Wald [Class. Quantum Grav. 17, 4999, (2000)] who argued that thisrelation is gauge dependent and therefore lacks physical significance. In thispaper, we clear up this controversy by showing that both papers are correct butneed to be interpreted in distinct paradigms. In this context, we introduce anew paradigm to interpret gravitational phenomena, which we call the HarmonicBackground Paradigm. This harmonic background paradigm starts from the ideathat there exists a more fundamental background causality provided by a flatspacetime geometry. One of the consequences of this paradigm is that the VBLrelation provides an explanation of why gravity is attractive in all standardweak-field situations.

The harmonic background paradigm, or why gravity is attractive