Monotonicity and bounds for the zero count before maximal volume

From papers

For each parameter a>0a>0 or b>0b>0, let C(a)\mathcal{C}(a) or C(b)\mathcal{C}(b) denote the number of zeroes of v0v_0 before the maximal-volume orbit of Ψa\Psi_a or Ψb\Psi_b, respectively.

Zero-count conjecture. The count satisfies:

  1. C(a)\mathcal{C}(a) and C(b)\mathcal{C}(b) are decreasing in aa and bb, respectively.
  2. For a>0a>0 sufficiently small, C(a)=1\mathcal{C}(a)=1; for b>0b>0 sufficiently small, C(b)=2\mathcal{C}(b)=2.
  3. C(a)=0\mathcal{C}(a)=0 for all a3a\geq\sqrt{3}, and C(b)=1\mathcal{C}(b)=1 for all b1b\geq1.

These parameter-counting assertions are numerical conjectures intended to control when the Doubling Lemma applies; their analytic verification remains open.

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Sources & referencesView supporting material

Primary source

Lorenzo Foscolo and Mark Haskins, “New G2 holonomy cones and exotic nearly Kaehler structures on the 6-sphere and the product of a pair of 3-spheres”, arXiv:1501.07838 (2016).

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