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We study a growth maximization problem for a continuous time positive linear system with switches. This is motivated by a problem of mathematical biology: modeling growth-fragmentation processes and the PMCA protocol (Protein Misfolding Cyclic Amplification). We show that the growth rate is determined by the non-linear eigenvalue of a max-plus analogue of the Ruelle-Perron-Frobenius operator, or equivalently, by the ergodic constant of a Hamilton-Jacobi (HJ) partial differential equation, the solutions or subsolutions of which yield Barabanov and extremal norms, respectively. We exploit contraction properties of order preserving flows, with respect to Hilbert's projective metric, to show that the nonlinear eigenvector of the operator, or the &#x201C;weak KAM&#x201D; solution of the HJ equation, does exist. Low dimensional examples are presented, showing that the optimal control can lead to a limit cycle.

Non-linear eigenvalue problems arising from growth maximization of positive linear dynamical systems