# Bbc galactic lens , dark energy

1. Aug 20, 2010

### skydivephil

The BBc just publsihed this story:
http://www.bbc.co.uk/news/science-environment-11030889

The conclusion is:
"Professor Priyamvada Natarajan of Yale University, a leading cosmologist and co-author of this study, said that the findings finally proved "exactly what the fate of the Universe will be". "

Surely this is premature? Until we udnerstand what dark energy is we cant say its a contsant and if its not constant it may die down or even reverse and so the ultimate fate of the unvierse is still unknown.

2. Aug 20, 2010

### George Jones

Staff Emeritus
Constant dark energy/cosmology constant has equation of state $p = -\rho[itex], i.e., [itex]w = -1$. While it cannot be ruled out that w will remain constant, this paper's result is consistent (with smaller error bands than before) with constant $w = -1$.

From the Science article's abstract:
From the end of the article: