Blow-up in reaction-diffusion equations with exponential and power-type nonlinearities

Research output: ThesisDoctoral ThesisCollection of Articles


  • Aappo Pulkkinen

Research units


In this dissertation we study blow-up phenomena in semilinear parabolic equations with both exponential and power-type nonlinearities. We study the behavior of the solutions as the blow-up moment in time and the blow-up point in space are approached. Our focus is on the supercritical case; however, we also give some results on the subcritical case. We prove results concerning the blow-up rate of solutions, and we obtain the blow-up profile for limit L1-solutions both with respect to the similarity variables and at the blow-up moment. We use techniques that are applicable both for the exponential and power nonlinearities. We also consider immediate regularization for minimal L1-solutions and improve on some earlier results. We are also interested in the behavior of selfsimilar solutions and we prove the existence of regular selfsimilar solutions that intersect the singular one arbitrary number of times.


Original languageEnglish
QualificationDoctor's degree
Awarding Institution
  • Aalto University
Print ISBNs978-952-60-4138-4
Electronic ISBNs978-952-60-4139-1
Publication statusPublished - 2011
MoE publication typeG5 Doctoral dissertation (article)

    Research areas

  • semilinear parabolic equation, supercritical case, exponential nonlinearity, power-type nonlinearity, blow-up, selfsimilar solutions, blow-up rate, blow-up profile, regularity, semigroup estimates

ID: 21876289