Analytic capacity and projections

Alan Chang, Xavier Tolsa

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


In this paper we study the connection between the analytic capacity of a set and the size of its orthogonal projections. More precisely, we prove that if E ⊂ C is compact and μ is a Borel measure supported on E, then the analytic capacity of E satisfies (equation presented) where c is some positive constant, I ⊂ (0; π) is an arbitrary interval, and Pθμ is the image measure of μ by Pθ , the orthogonal projection onto the line freiθ V r 2 Rg. This result is related to an old conjecture of Vitushkin about the relationship between the Favard length and analytic capacity. We also prove a generalization of the above inequality to higher dimensions which involves related capacities associated with signed Riesz kernels.

Original languageEnglish (US)
Pages (from-to)4121-4159
Number of pages39
JournalJournal of the European Mathematical Society
Issue number12
StatePublished - Oct 5 2020

All Science Journal Classification (ASJC) codes

  • General Mathematics
  • Applied Mathematics


  • Analytic capacity
  • Favard length
  • Projections
  • Vitushkin's conjecture


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