Abstract:
In this paper, we analyze the dynamical behavior of the delayed fractional-order tumor
model with Caputo sense and discretized conformable fractional-order tumor model. The model is
constituted with the group of nonlinear differential equations having effector and tumor cells. First
of all, stability and bifurcation analysis of the delayed fractional-order tumor model in the sense of
Caputo fractional derivative is studied, and the existence of Hopf bifurcation depending on the time
delay parameter is proved by using center manifold and bifurcation theory. Applying the discretization
process based on using the piecewise constant arguments to the conformable version of the model gives
a two-dimensional discrete system. Stability and Neimark–Sacker bifurcation analysis of the discrete
system are demonstrated using the Schur-Cohn criterion and projection method. This study reveals that
the delay parameter τ in the model with Caputo fractional derivative and the discretization parameter
h in the discrete-time conformable fractional-order model have similar effects on the dynamical behavior
of corresponding systems. Moreover, the effect of the order of fractional derivative on the dynamical
behavior of the systems is discussed. Finally, all results obtained are interpreted biologically, and
numerical simulations are presented to illustrate and support theoretical results.