Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-07-22
Phys.Lett.B601:197-200,2004
Physics
High Energy Physics
High Energy Physics - Theory
6 pages LaTeX
Scientific paper
10.1016/j.physletb.2004.09.054
In spontaneously broken supergravity with non-flat potential the vanishing of the cosmological constant is usually associated with a non-trivial balancing of two opposite-sign contributions. We make the simple observation that, in an appropriately defined expansion of the superfield action in inverse powers of $M_P$, this tuning corresponds to the absence of two specific operators. It is then tempting to speculate what kind of non-standard symmetry or structural principle might underlie the observed extreme smallness of the corresponding coefficients in the real world. Independently of such speculations, the suggested expansion appears to be a particularly simple and convenient starting point for the effective field theory analysis of spontaneously broken supergravity models.
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