# Gravitational waves and negative pressure

I was recently reviewing an article published by Dr. Harold White and Dr. Eric Davis (as seen here) which summarized the creation and activity of negative pressure for a supposed place-filler for the theory of dark energy. The article suggests that the energy density of a given volume can be equivalent to an opposing negative pressure within that volume (thus a positive energy density shall be equal to a given negative pressure). Additionally, the text of Gravitational waves in cosmological models with negative pressure (http://iopscience.iop.org/article/10.1088/0264-9381/16/7/309/meta) discusses how gravitational waves also apply the equivalency of negative pressure and a positive energy density. Additionally, the curvature of the space is $keff = k-(8/3) G0s$, thus, depicting a similarity that appears eminent. So my question is, is this actually possible? Do gravitational waves behave like spatial negative pressure? If I am wrong (which I am relatively sure I may be), why am I wrong?

• Always be cautious of a paper with figures made in excel. – DilithiumMatrix Dec 24 '16 at 1:20