Abstract
We derive the classical null energy condition, understood as a constraint on the Ricci tensor, from the second law of thermodynamics applied locally to Bekenstein-Hawking entropy associated with patches of null congruences. The derivation provides evidence that the null energy condition, which has usually been regarded as a condition on matter, is fundamentally a property of gravity.
Original language | English (US) |
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Article number | 104002 |
Journal | Physical Review D |
Volume | 95 |
Issue number | 10 |
DOIs | |
State | Published - 2017 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)