Existence of arbitrarily many metastable critical points of gξg_{\xi}

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For integers m,n1,…,nmm,n_1,\dots,n_m and parameters ν1(1),…,νn1(1),ν1(2),…,νn2(2),…,νnm(m)\nu_{1}^{(1)},\dots,\nu_{n_1}^{(1)},\nu_{1}^{(2)},\dots,\nu_{n_2}^{(2)},\dots,\nu_{n_m}^{(m)}, consider the functions gξg_{\xi} arising in the bootstrap-percolation model. A critical point qiq_i is called (ν1(i),…,νni(i))(\nu_{1}^{(i)},\dots,\nu_{n_i}^{(i)})-metastable at x1(i),…,xni(i)x_{1}^{(i)},\dots,x_{n_i}^{(i)} when it has the corresponding metastability behavior at those points. Metastability conjecture. There exists a function gξg_{\xi}, parameters {qi}i=1m\{q_i\}_{i=1}^{m}, and points {xj(i)}1≤i≤m, 1≤j≤ni\{x_j^{(i)}\}_{1\leq i\leq m,\,1\leq j\leq n_i} such that each qiq_i is a critical point which is (ν1(i),…,νni(i))(\nu_{1}^{(i)},\dots,\nu_{n_i}^{(i)})-metastable at x1(i),…,xni(i)x_{1}^{(i)},\dots,x_{n_i}^{(i)}. The claim formalizes the expectation that suitable offspring distributions can produce arbitrarily many decreasing local maxima of gξg_{\xi} and hence multiple phase transitions; the supplied text does not establish it or indicate a resolution status.

References

Primary source

Assaf Shapira, “Metastable Behavior of Bootstrap Percolation on Galton-Watson Trees”, arXiv:1706.08390 (2018).

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