http://www.universetoday.com/am/publish/ripples_spacetime_dark_energy.html?1832005 The nature of dark energy is a mystery. It can be a cosmological constant, or perhaps a scalar field called quintessence, or perhaps phantom energy I've seen this new theory that affirms that is nothing of the above, but is due to ripples in spacetime (gravitational waves) created during inflation. I appreciate any comments
For this to be the case our "observable" universe would have to be currently sitting in the dead centre of a `trough`… This, although possible, seems very ad hoc; Probability wise, it seems that the universe should actually be surfing on the `slope` of this space-time ripple, resulting in a `directional` expansion rate. Also, others have noted that as the wavelength of the perturbations gets longer, the space time slope diminishes, so that the ripples would have no effect on the observable universe. (see another thread)