Distance to a prime Reeb orbit in the tube around it is comparable to the normal coordinate
ProvedFiniteEnergyPlane.exists_mul_norm_le_infDist_proj_add_of_isPrimepseudoholomorphic-curvessymplectic-geometry
Let be a prime periodic Reeb orbit on a strictly star-shaped level . There are such that for every and every with , the point has distance at least from the image of .
So in the tube coordinates around , the normal coordinate is controlled by the distance to the orbit.
Preamble
import Definitions.Def_FiniteEnergyPlane_Winding
Formal statement
namespace FiniteEnergyPlane
open MeasureTheory Metric Filter Topology
open scoped ContDiff ENNReal Real
/-- Distance to a prime orbit in the tube around it. For a prime periodic Reeb orbit `P = (x, T)`
there are `c, ρ > 0` such that for every `τ` and every `h ∈ ξ_{x(τ)}` with `‖h‖ ≤ ρ`, the point
`proj (x(τ) + h)` has distance at least `c ‖h‖` from the image of `P`. -/
theorem exists_mul_norm_le_infDist_proj_add_of_isPrime {n : ℕ} (H : V n → ℝ)
(hH : IsStrictlyStarShapedLevel H) (J : V n → V n →L[ℝ] V n)
(hJ : IsCompatibleXiStructure H J) (P : ReebOrbit H) (hP : P.IsPrime) :
∃ c > 0, ∃ ρ > 0, ∀ (τ : ℝ) (h : V n), IsInXi H (P.x τ) h → ‖h‖ ≤ ρ →
c * ‖h‖ ≤ infDist (proj H (P.x τ + h)) (Set.range P.x) := by
sorry
end FiniteEnergyPlane
Source
U. Hryniewicz, Trans. AMS 364 (2012), § 6