Abstract

We consider singular-degenerate, multivalued stochastic fast diffusion equations with multiplicative Lipschitz continuous noise. In particular, this includes the stochastic sign fast diffusion equation arising from the Bak--Tang--Wiesenfeld model for self-organized criticality. A well-posedness framework based on stochastic variational inequalities (SVI) is developed, characterizing solutions to the stochastic sign fast diffusion equation, previously obtained in a limiting sense only. Aside from generalizing the SVI approach to stochastic fast diffusion equations we develop a new proof of well-posedness, applicable to general diffusion coefficients. In case of linear multiplicative noise, we prove the existence of (generalized) strong solutions, which entails higher regularity properties of solutions than previously known.

Keywords

  1. singular-degenerate SPDE
  2. multivalued SPDE
  3. self-organized criticality
  4. stochastic fast diffusion
  5. sign fast diffusion
  6. regularity
  7. stochastic variational inequalities

MSC codes

  1. Primary
  2. 60H15; Secondary
  3. 76S05

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Information & Authors

Information

Published In

cover image SIAM Journal on Mathematical Analysis
SIAM Journal on Mathematical Analysis
Pages: 4058 - 4090
ISSN (online): 1095-7154

History

Submitted: 13 January 2015
Accepted: 3 September 2015
Published online: 29 October 2015

Keywords

  1. singular-degenerate SPDE
  2. multivalued SPDE
  3. self-organized criticality
  4. stochastic fast diffusion
  5. sign fast diffusion
  6. regularity
  7. stochastic variational inequalities

MSC codes

  1. Primary
  2. 60H15; Secondary
  3. 76S05

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