English

On the failure of the chain rule for the divergence of Sobolev vector fields

Analysis of PDEs 2022-04-05 v1

Abstract

We construct a large class of incompressible vector fields with Sobolev regularity, in dimension d3d \geq 3, for which the chain rule problem has a negative answer. In particular, for any renormalization map β\beta (satisfying suitable assumptions) and any (distributional) renormalization defect TT of the form T=divhT = {\rm div}\, h, where hh is an L1L^1 vector field, we can construct an incompressible Sobolev vector field uW1,p~u \in W^{1, \tilde p} and a density ρLp\rho \in L^p for which div(ρu)=0{\rm div}\, (\rho u) =0 but div(β(ρ)u)=T{\rm div}\, (\beta(\rho) u) = T, provided 1/p+1/p~1+1/(d1)1/p + 1/\tilde p \geq 1 + 1/(d-1)

Keywords

Cite

@article{arxiv.2204.01363,
  title  = {On the failure of the chain rule for the divergence of Sobolev vector fields},
  author = {Miriam Buck and Stefano Modena},
  journal= {arXiv preprint arXiv:2204.01363},
  year   = {2022}
}

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24 pages