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  • 1.
    Makhlouf, K.
    et al.
    Univ Biskra, Dept Math, Biskra, Algeria..
    Agram, Nacira
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.).
    Hilbert, A.
    Linnaeus Univ LNU, Dept Math, Växjö, Sweden..
    oksendal, B.
    Univ Oslo, Dept Math, Oslo, Norway..
    SPDEs with space interactions and application to population modelling2023In: ESAIM: Control, Optimisation and Calculus of Variations , ISSN 1292-8119, E-ISSN 1262-3377, Vol. 29, article id 18Article in journal (Refereed)
    Abstract [en]

    We consider optimal control of a new type of non-local stochastic partial differential equations (SPDEs). The SPDEs have space interactions, in the sense that the dynamics of the system at time t and position in space x also depend on the space-mean of values at neighbouring points. This is a model with many applications, e.g. to population growth studies and epidemiology. We prove the existence and uniqueness of strong, smooth solutions of a class of SPDEs with space interactions, and we show that, under some conditions, the solutions are positive for all times if the initial values are. Sufficient and necessary maximum principles for the optimal control of such systems are derived. Finally, we apply the results to study an optimal vaccine strategy problem for an epidemic by modelling the population density as a space-mean stochastic reaction-diffusion equation.

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