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Nobody denies the existence and interest of vacuum energy. Everybody loves Lamb shift and Casimir effect. The issue is whether or not it GRAVITATES. In some variants of GR it does contribute to baseline curvature, in some it does not.Chronos said:I concur the curvature constant is the gorilla in the room, but, I find it difficult to deny vacuum energy offers a tantalizing carrot to explain the lamb shift and casimir effect...
Intuitively, since it is the same everywhere and at all times, it doesn't NEED to contribute to spacetime curvature---and there are various ways to implement that being actively studied. I'm with you on supporting Casimir effect Lamb shift and all, but that's a separate issue. : ^)
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