Unimodular gravity with signature reversal symmetry in a D=2(2n+1)-dimensional bulk resolves the second cosmological constant problem by determining its specific small value.
A symmetry for vanishing cosmological constant in an extra dimensional toy model
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abstract
We introduce a symmetry principle that forbids a bulk cosmological constant in six and ten dimensions. Then the symmetry is extended so that it insures absence of 4-dimensional cosmological constant induced by the six dimensional curvature scalar, at least, for a class of metrics. A small cosmological constant may be induced by breaking of the symmetry by a small amount.
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Resolution of the cosmological constant problem by unimodular gravity and signature reversal symmetry
Unimodular gravity with signature reversal symmetry in a D=2(2n+1)-dimensional bulk resolves the second cosmological constant problem by determining its specific small value.