From Paul Allen
You report on the hunt for dark energy (11 May, p 32). My hypothesis is that dark matter and dark energy are different manifestations of the same particle: an as-yet-undiscovered boson with a force that at galactic scale is attractive but at universal scale is repulsive (a sort of Higgs boson with multiple personality disorder). I dub it the phlogiston.
Cardigan, Ceredigion, UK
