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Boundedness in a quasilinear attraction–repulsion chemotaxis system with variable logistic source
AIMS Mathematics 2025, 10(8): 19867-19877
Published: 15 August 2025
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This paper deals with a quasilinear attraction–repulsion chemotaxis system with a source term of variable logistic type u t = ( ϕ ( u ) u ) ( ψ ( u ) v ) + ( φ ( u ) w ) + g ( u ), τ 1 v t = Δ v v + u, Δ w = w + u in a smooth bounded domain Ω R n ( n 1), and endowed with nonnegative initial data and homogeneous Neumann boundary conditions. Moreover, the logistic source verifies g ( x , s ) η s k ( x ) μ s m ( x ) , s > 0 with g ( x , 0 ) 0, x Ω, where η 0, μ > 0 are constants, k , m are measurable functions fulfilling 0 k := e s s inf x Ω k ( x ) k ( x ) k + := e s s sup x Ω k ( x ) < + and 1 < m := e s s inf x Ω m ( x ) m ( x ) m + := e s s sup x Ω m ( x ) < + , as well as ϕ , ψ, and φ are regular functions satisfying c 1 s p ϕ ( s ), ψ ( s ) c 2 s q , and c _ 3 s l φ ( s ) c 3 s l with p , q , l R , c 1 , c 2 , c _ 3 , c 3 > 0 and s s 0 > 1. We show that when q = m 1 and l m 1, there exists μ > 0 such that if μ > μ , then the corresponding initial-boundary value problem possesses a unique globally bounded classical solution. Moreover, the same conclusion holds true provided that q < m 1 and l m 1 for any μ > 0.

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