quantum mechanics: fluctuations (Introduction)

by David Turell , Wednesday, September 04, 2013, 14:04 (4099 days ago) @ David Turell

Strassler explains our unique universe:-"To say this another way: even though it is possible that there is a special cancellation between the boson fields of nature and the fermion fields of nature, it appears that such a cancellation could only occur by accident, and in only a very tiny tiny tiny fraction of quantum field theories, or of quantum theories of any type (including string theory). Thus, only a tiny tiny tiny fraction of imaginable universes would even vaguely resemble our own (or at least, the part of our own that we can observe with our eyes and telescopes). In this sense, the cosmological constant is a problem of "naturalness", as particle physicists and their colleagues use the term: because it has so little dark energy in it compared to what we'd expect, the universe we live in appears to be highly non-generic, non-typical one."-http://profmattstrassler.com/articles-and-posts/particle-physics-basics/quantum-fluctuations-and-their-energy/