At our weekly journal club this morning, an interesting paper cropped up...
Grenon and Lake (2010). Generalised Swiss-cheese cosmologies: mass scales. Physical Review D, 81, a/n 023501.
The authors generalised Swiss cheese cosmologies and included reference to non-zero momenta of associated boundary surfaces and concluded that final effective gravitational mass and size of evolving inhomogeneities depended on their linear momenta.
I think I'll steer clear of theoretical physics and stick to the stuff made from milk! Much tastier! Jokes aside, I would welcome a physicist explaining this aspect of cosmology to me in words of one syllable...
