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129170 https://hdl.handle.net/2286/R.I.35632 <p>Parikh, Maulik, &amp; van der Schaar, Jan Pieter (2015). Derivation of the null energy condition. PHYSICAL REVIEW D, 91(8), 0-0. http://dx.doi.org/10.1103/PhysRevD.91.084002</p> 10.1103/PhysRevD.91.084002 1088-6826 0002-9939 http://rightsstatements.org/vocab/InC/1.0/ 2015-04-03 5 pages eng Parikh, Maulik van der Schaar, Jan Pieter College of Liberal Arts and Sciences Copyright 2015 by the American Physical Society. View the article as published at http://dx.doi.org/10.1103/PhysRevD.91.084002 <p>We derive the null energy condition, understood as a constraint on the Einstein-frame Ricci tensor, from world sheet string theory. For a closed bosonic string propagating in a curved geometry, the spacetime interpretation of the Virasoro constraint condition is precisely the null energy condition, to leading nontrivial order in the α′ expansion. Thus the deepest origin of the null energy condition lies in world sheet diffeomorphism invariance.</p> Text Derivation of the Null Energy Condition