Generalized surface quasi-geostrophic equations with singular velocities.

*(English)*Zbl 1244.35108Summary: This paper establishes several existence and uniqueness results for two families of active scalar equations with velocity fields determined by the scalars through very singular integrals. The first family is a generalized surface quasigeostrophic (SQG) equation with the velocity field \(u\) related to the scalar \(\theta \) by \(u=\nabla^{\bot}\Lambda^{\beta -2}\theta\), where \(1<\beta \leq 2\) and \(\Lambda =(-\Delta)^{1/2}\) is the Zygmund operator. The borderline case \(\beta = 1\) corresponds to the SQG equation and the situation is more singular for \(\beta > 1\). We obtain the local existence and uniqueness of classical solutions, the global existence of weak solutions, and the local existence of patch-type solutions. The second family is a dissipative active scalar equation with \(u=\nabla^{\bot}(\log (I-\delta ))^{\mu}\theta\) for \(\mu > 0\), which is at least logarithmically more singular than the velocity in the first family. We prove that this family with any fractional dissipation possesses a unique local smooth solution for any given smooth data. This result for the second family constitutes a first step towards resolving the global regularity issue recently proposed by K. Ohkitani [Dissipative and ideal surface quasi-geostrophic equations. Lecture presented at ICMS, Edinburgh (2010)].

##### MSC:

35Q35 | PDEs in connection with fluid mechanics |

35D30 | Weak solutions to PDEs |

35A02 | Uniqueness problems for PDEs: global uniqueness, local uniqueness, non-uniqueness |

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\textit{D. Chae} et al., Commun. Pure Appl. Math. 65, No. 8, 1037--1066 (2012; Zbl 1244.35108)

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