Prado Martin-Moruno, Matt Visser
The classical energy conditions are known to not be fundamental physics -- they are typically violated by semiclassical quantum effects. Consequently, some effort has gone into finding possible semiclassical replacements for the classical energy conditions -- the most well developed being the Ford-Roman quantum inequalities. In the current article we shall instead develop classical and quantum versions of a "flux energy condition" (FEC and QFEC) based on the notion of constraining the possible fluxes measured by timelike observers. The classical FEC will be seen to be satisfied by some quantum states, while its quantum analogue (the QFEC) is satisfied under a rather wide range of conditions.
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http://arxiv.org/abs/1305.1993
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