#### Title

Critical parameters for reaction–diffusion equations involving space–time fractional derivatives

#### Document Type

Article

#### Publication Date

2020

#### Publication Title

Nonlinear Differential Equations and Applications

#### Abstract

We will look at reaction–diffusion type equations of the following type, ∂tβV(t,x)=-(-Δ)α/2V(t,x)+It1-β[V(t,x)1+η].We first study the equation on the whole space by making sense of it via an integral equation. Roughly speaking, we will show that when 0 < η⩽ ηc, there is no global solution other than the trivial one while for η> ηc, non-trivial global solutions do exist. The critical parameter ηc is shown to be 1η∗ where η∗,=supa>0{supt∈(0,∞),x∈Rdta∫RdG(t,x-y)V0(y)dy<∞}and G(t,x) is the heat kernel of the corresponding unforced operator. V is a non-negative initial function. We also study the equation on a bounded domain with Dirichlet boundary condition and show that the presence of the fractional time derivative induces a significant change in the behavior of the solution.

#### Department

Mathematics

#### Volume Number

27

#### Issue Number

3

#### DOI

10.1007/s00030-020-00629-9

#### Recommended Citation

Asogwa, S. A., Foondun, M., Mijena, J. B., & Nane, E. (2020). Critical parameters for reaction–diffusion equations involving space–time fractional derivatives. *Nonlinear Differential Equations and Applications, 27*(3).

## Comments

© 2020, The Author(s).