Dynamics in Chemotaxis Models of Parabolic-Elliptic Type on Bounded Domain with Time and Space Dependent Logistic Sources

作者：Issa Tahir Bachar^*; Shen Wenxian

来源：SIAM Journal on Applied Dynamical Systems, 2017, 16(2): 926-973.

DOI：10.1137/16M1092428

• parabolic-elliptic chemotaxis system
• logistic source
• classical solution
• local existence
• global existence
• entire positive solution
• periodic positive solution
• almost periodic positive solution
• asymptotic behavior

This paper considers the dynamics of a chemotaxis system of parabolic-elliptic type with local as well as nonlocal time and space dependent logistic source on bounded domains. We first prove the local existence and uniqueness of classical solutions for various initial functions. Next, under some explicit conditions on the coefficients, the chemotaxis sensitivity x and the space dimension n, we prove the global existence and boundedness of classical solutions with certain given integrable or uniformly continuous nonnegative initial functions. Then, under the same conditions for the global existence, we show that the system has an entire positive classical solution. Moreover, if the coefficients are periodic in t with period T or are independent of t, then the system has a time periodic positive solution with periodic T or a steady state positive solution. If the coefficients are independent of x (i.e., are spatially homogeneous), then the system has a spatially homogeneous entire positive solution. Finally, under some further explicit assumptions, we prove that the system has a unique entire positive solution which is globally stable. Furthermore, if the coefficients are periodic or almost periodic in t, then the unique entire positive solution is also periodic or almost periodic in t.

• 出版日期2017