"Vacuum catastrophe" and string theory

Hi.

Does string theory purport a solution to the so-called "vacuum
catastrophe" problem? This problem is how to rationalize the huge zero
point energy (ZPE) of the vacuum predicted by quantum mechanics, with
the experimentally small cosmological constant (lambda). How does it
do this? It's a tough situation. If you toss out the huge ZPE and
decide instead it should be tiny, then you toss quantum mechanics. If
you toss out the cosmological constant in favor of the quantum
predictions, then you toss out general relativity. But string theory
is supposed to combine these two, and if it does that, it should be
able to answer this problem. So how does it?

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