Pith. sign in

The null energy condition and instability

2 Pith papers cite this work. Polarity classification is still indexing.

2 Pith papers citing it
abstract

We extend previous work showing that violation of the null energy condition implies instability in a broad class of models, including gauge theories with scalar and fermionic matter as well as any perfect fluid. Simple examples are given to illustrate these results. The role of causality in our results is discussed. Finally, we extend the fluid results to more general systems in thermal equilibrium. When applied to the dark energy, our results imply that w is unlikely to be less than -1.

citation-role summary

background 1

citation-polarity summary

years

2026 2

verdicts

UNVERDICTED 2

roles

background 1

polarities

background 1

representative citing papers

The energy conditions and model selection in the local Universe

astro-ph.CO · 2026-05-27 · unverdicted · novelty 4.0

Local HII galaxy and cosmic chronometer data favor the Rh=ct universe over ΛCDM at 92% vs 8% likelihood, with Rh=ct satisfying all energy conditions while ΛCDM violates the strong energy condition at z≲2.

citing papers explorer

Showing 2 of 2 citing papers.