The null energy condition and its violation

By V. Rubakov. 2014

236 citations recorded by the source corpus.

A brief review is given of scalar field theories with second-derivative Lagrangians yielding second-order field equations. Some of these theories permit solutions that violate the null energy condition but otherwise show no obvious inconsistencies. The use of these theories in constructing cosmological scenarios and in the context of a laboratory-created universe is illustrated with examples.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/2f76bf85c7ae5b81c91ec9aa35b41c48fe8f8255

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In Astronomy and Astrophysics

In Nuclear and High Energy Physics

In Statistical and Nonlinear Physics

Citations in the corpus

Generalized Galileons: instabilities of bouncing and Genesis cosmologies and modified Genesis (2016, unknown): “[10]).”
Shadows and strong gravitational lensing: a brief review (2018, background): “Furthermore, the NEC is often considered to be a robust assumption for a healthy theory of gravity, although there can be exceptions [39].”
Horndeski theory and beyond: a review (2019, background): “[87] for a mini-review on the same subject.”
The Effective Field Theory of nonsingular cosmology (2016, background): “We can define the “bouncing phase” as the time interval during which the NEC is violated, i.e., Ḣ > 0.”
A Critical Review of Classical Bouncing Cosmologies (2014, unknown): “[340] V. Rubakov (2014), 1401.4024.”