Stationary-solution and classical-solution conjecture below unit mass

Consider the discrete coagulation-fragmentation equation with multiplicative coagulation and constant fragmentation kernels, with initial data ρ0\rho_0 satisfying the paper's initial-data condition. Let m1(ρ0)m_1(\rho_0) denote the initial mass, and let mm denote the mass prescribed for a stationary solution. Stationary-solution and classical-solution conjecture.

(i) For 1/2<m<11/2<m<1, the equation admits a unique stationary solution ρ~:N[0,)\tilde\rho:\mathbb{N}\to[0,\infty) such that

m1(ρ~)=m,m_1(\tilde\rho)=m,

and ρ~\tilde\rho satisfies the stated recursive formula.

(ii) For 1/2m1(ρ0)<11/2\leq m_1(\rho_0)<1, the equation admits a unique mass-conserving solution ρ\rho for all time, and this solution is classical.

The first part extends the known stationary-solution result from masses at most 1/21/2 to the range 1/2<m<11/2<m<1, while the second asserts global existence and regularity in the same subcritical regime. The source says the extension is motivated by numerical computations; no resolution is supplied.

Sources & referencesView supporting material

Primary source

Jiwoong Jang and Hung V. Tran, “Discrete Coagulation-Fragmentation equations with multiplicative coagulation kernel and constant fragmentation kernel”, arXiv:2409.17974 (2024).

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