Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-05-30
Nucl.Phys.B602:307-328,2001
Physics
High Energy Physics
High Energy Physics - Theory
25 pages, revised and expanded discussion
Scientific paper
10.1016/S0550-3213(01)00097-9
We modify and extend an earlier proposal by Brown and Teitelboim to relax the effective cosmological term by nucleation of branes coupled to a three-index gauge potential. Microscopic considerations from string/M theory suggest two major innovations in the framework. First, the dependence of brane properties on the compactification of extra dimensions may generate a very small quantized unit for jumps in the effective cosmological term. Second, internal degrees of freedom for multiply coincident branes may enhance tunneling rates by exponentially large density of states factors. These new features essentially alter the relaxation dynamics. By requiring stability on the scale of the lifetime of the universe, rather than absolute stability, we derive a non-trivial relation between the supersymmetry breaking scale and the value of the cosmological term. It is plausibly, though not certainly, satisfied in Nature.
Feng Jonathan L.
March-Russell John
Sethi Savdeep
Wilczek Frank
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