Abstract
We consider a time-dependent free boundary problem with radially symmetric initial data: σ t − Δσ + σ = 0 if and σ(r,0)=σ0(r) in {r < R(0)} where R(0) is given. This is a model for tumor growth, with nutrient concentration (or tumor cells density) σ(r,t) and proliferation rate then there exists a unique stationary solution (σ S (r), R S ), where R S depends only on the number . We prove that there exists a number μ *, such that if μ < μ * . . . then the stationary solution is stable with respect to non-radially symmetric perturbations, whereas if μ > μ * then the stationary solution is unstable.
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Friedman, A., Hu, B. Bifurcation From Stability to Instability for a Free Boundary Problem Arising in a Tumor Model. Arch. Rational Mech. Anal. 180, 293–330 (2006). https://doi.org/10.1007/s00205-005-0408-z
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DOI: https://doi.org/10.1007/s00205-005-0408-z