article

Title: Non-tangentially accessible domains for vector fields

Authors: Roberto Monti and Daniele Morbidelli

Issue: Volume 54 (2005), Issue 2, 473-498

Abstract:

$We study non-tangentially accessible (NTA) domains for diagonal vector fields. We introduce a geometric notion of "admissible boundary" ensuring the NTA property. For general H\"ormander vector fields, we prove that a domain with non characteristic boundary is NTA.$