Mathematics > Optimization and Control
[Submitted on 22 May 2020 (v1), last revised 3 Oct 2021 (this version, v3)]
Title:Multi-group SIS Epidemics with Simplicial and Higher-Order Interactions
View PDFAbstract:This paper analyzes a Susceptible-Infected-Susceptible (SIS) model of epidemic propagation over hypergraphs and, motivated by an important special case, we refer to the model as to the simplicial SIS model. Classically, the multi-group SIS model has assumed pairwise interactions of contagion across groups and thus has been vastly studied in the literature. It is only recently that a renewed special attention has been drawn to the study of contagion dynamics over higher-order interactions and over more general graph structures, like simplexes. Previous work on mean-field approximation scalar models of the simplicial SIS model has indicated that a new dynamical behavior domain, compared to the classical SIS model, appears due to the newly introduced higher order interaction terms: both a disease-free equilibrium and an endemic equilibrium co-exist and are both locally asymptotically stable. This paper formally establishes that bistability (as a new epidemiological behavior) also appears in the multi-group simplicial SIS model. We give sufficient conditions over the model's parameters for the appearance of this and the other behavioral domains present in the classical multi-group SIS model. We additionally provide an algorithm to compute the value of the endemic equilibrium and report numerical analysis of the transition from the disease-free domain to the bistable domain.
Submission history
From: Pedro Cisneros-Velarde [view email][v1] Fri, 22 May 2020 21:48:26 UTC (855 KB)
[v2] Wed, 24 Feb 2021 09:42:01 UTC (858 KB)
[v3] Sun, 3 Oct 2021 19:01:06 UTC (860 KB)
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