<p>We consider constrained-degree percolation on the hypercubic lattice. This is a continuous-time model defined by a sequence <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\((U_e)_{e}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi>U</mi> <mi>e</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mi>e</mi> </msub> </math></EquationSource> </InlineEquation> of i.i.d. uniform random variables and a positive integer <i>k</i>, referred to as the constraint. The model evolves as follows: each edge <i>e</i> attempts to open at a random time <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(U_e\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>U</mi> <mi>e</mi> </msub> </math></EquationSource> </InlineEquation>, independently of all other edges. It succeeds if, at time <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(U_e\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>U</mi> <mi>e</mi> </msub> </math></EquationSource> </InlineEquation>, both of its end-vertices have degrees strictly smaller than <i>k</i>. It is known [<CitationRef CitationID="CR21">21</CitationRef>] that this model undergoes a phase transition when <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(d\ge 3\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>d</mi> <mo>≥</mo> <mn>3</mn> </mrow> </math></EquationSource> </InlineEquation> for most nontrivial values of <i>k</i>. In this work, we prove that, for any fixed constraint, the number of infinite clusters at any time <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(t\in [0,1)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>t</mi> <mo>∈</mo> <mo stretchy="false">[</mo> <mn>0</mn> <mo>,</mo> <mn>1</mn> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> is almost surely either 0 or 1. We also show that the law of the process is differentiable with respect to time for local events, extending a result of [<CitationRef CitationID="CR30">30</CitationRef>]. As a consequence of these two results, we prove that the percolation function is continuous in the supercritical regime <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(t\in (t_c,1)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>t</mi> <mo>∈</mo> <mo stretchy="false">(</mo> <msub> <mi>t</mi> <mi>c</mi> </msub> <mo>,</mo> <mn>1</mn> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>, where <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(t_c\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>t</mi> <mi>c</mi> </msub> </math></EquationSource> </InlineEquation> denotes the percolation critical threshold. Finally, we show that the two-point connectivity function is bounded away from zero in the supercritical regime.</p>

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Constrained-Degree Percolation on the Hypercubic Lattice: Uniqueness and Some of its Consequences

  • Weberson S. Arcanjo,
  • Alan S. Pereira,
  • Diogo C. dos Santos,
  • Roger W. C. Silva,
  • Marco Ticse

摘要

We consider constrained-degree percolation on the hypercubic lattice. This is a continuous-time model defined by a sequence \((U_e)_{e}\) ( U e ) e of i.i.d. uniform random variables and a positive integer k, referred to as the constraint. The model evolves as follows: each edge e attempts to open at a random time \(U_e\) U e , independently of all other edges. It succeeds if, at time \(U_e\) U e , both of its end-vertices have degrees strictly smaller than k. It is known [21] that this model undergoes a phase transition when \(d\ge 3\) d 3 for most nontrivial values of k. In this work, we prove that, for any fixed constraint, the number of infinite clusters at any time \(t\in [0,1)\) t [ 0 , 1 ) is almost surely either 0 or 1. We also show that the law of the process is differentiable with respect to time for local events, extending a result of [30]. As a consequence of these two results, we prove that the percolation function is continuous in the supercritical regime \(t\in (t_c,1)\) t ( t c , 1 ) , where \(t_c\) t c denotes the percolation critical threshold. Finally, we show that the two-point connectivity function is bounded away from zero in the supercritical regime.