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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2510.10024 |
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| _version_ | 1866911203835510784 |
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| author | Bentout, Soufiane Vo, Hoang-Hung |
| author_facet | Bentout, Soufiane Vo, Hoang-Hung |
| contents | In this paper, we propose and analyze a nonlocal cooperative reaction--diffusion system with free boundaries and drift terms, motivated by directional epidemic spread. Lacking a variational structure but requiring sharper regularity of solutions, the model poses substantial analytical challenges compared with previous works~\cite{Du,Berestycki2016a,Berestycki2016b,Cao2019,NguyenVo2022,Tang2024a,Tang2024b}. We first establish the well-posedness of the local problem and the global existence and uniqueness of classical solutions in $C^1$ space.
We then study the associated nonlocal eigenvalue problem, proving the existence, simplicity, qualitative properties, and asymptotic behavior of the principal eigenvalue. The analysis employs Fredholm theory, the Crandall--Rabinowitz bifurcation theorem, and Hadamard-type derivative formulas to describe its parameter dependence and connection with the basic reproduction number~$R_0$.
Building on this spectral characterization, we show that the system admits a \emph{sharp vanishing--spreading dichotomy} in its long-term dynamics. When $R_0\le1$, all solutions vanish; for $R_0>1$, the outcome depends on the initial domain size~$h_0$ and the free-boundary expansion rate~$μ$. There exists a critical habitat length~$\mathcal L^\ast$ such that if $h_0<\mathcal L^\ast$, a threshold $\widehatμ>0$ separates vanishing ($μ\in(0,\widehatμ]$) from spreading ($μ>\widehatμ$). In the spreading regime, solutions converge to the unique positive steady state, while in the vanishing regime they decay uniformly to zero. These results provide a rigorous framework for the threshold dynamics of cooperative--advective nonlocal systems and offer mathematical insight for further studies in epidemic modeling, ecological invasion, and population dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_10024 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The eigentheory for nonlocal cooperative-advective system and its role in the study of free boundary system for directional epidemic models Bentout, Soufiane Vo, Hoang-Hung Analysis of PDEs 35K55, 35K57 In this paper, we propose and analyze a nonlocal cooperative reaction--diffusion system with free boundaries and drift terms, motivated by directional epidemic spread. Lacking a variational structure but requiring sharper regularity of solutions, the model poses substantial analytical challenges compared with previous works~\cite{Du,Berestycki2016a,Berestycki2016b,Cao2019,NguyenVo2022,Tang2024a,Tang2024b}. We first establish the well-posedness of the local problem and the global existence and uniqueness of classical solutions in $C^1$ space. We then study the associated nonlocal eigenvalue problem, proving the existence, simplicity, qualitative properties, and asymptotic behavior of the principal eigenvalue. The analysis employs Fredholm theory, the Crandall--Rabinowitz bifurcation theorem, and Hadamard-type derivative formulas to describe its parameter dependence and connection with the basic reproduction number~$R_0$. Building on this spectral characterization, we show that the system admits a \emph{sharp vanishing--spreading dichotomy} in its long-term dynamics. When $R_0\le1$, all solutions vanish; for $R_0>1$, the outcome depends on the initial domain size~$h_0$ and the free-boundary expansion rate~$μ$. There exists a critical habitat length~$\mathcal L^\ast$ such that if $h_0<\mathcal L^\ast$, a threshold $\widehatμ>0$ separates vanishing ($μ\in(0,\widehatμ]$) from spreading ($μ>\widehatμ$). In the spreading regime, solutions converge to the unique positive steady state, while in the vanishing regime they decay uniformly to zero. These results provide a rigorous framework for the threshold dynamics of cooperative--advective nonlocal systems and offer mathematical insight for further studies in epidemic modeling, ecological invasion, and population dynamics. |
| title | The eigentheory for nonlocal cooperative-advective system and its role in the study of free boundary system for directional epidemic models |
| topic | Analysis of PDEs 35K55, 35K57 |
| url | https://arxiv.org/abs/2510.10024 |