Abstract
This paper is addressed to study the existence of maximizers for the singular Moser–Trudinger supremum under constraints in the critical case
where \(a>0\), \(\beta \in [0,N)\), \(\Phi _N(t) = e^t -\sum _{k=0}^{N-2} \frac{t^k}{k!}\), \(\alpha _N = N \omega _{N-1}^{1/(N-1)}\), and \(\omega _{N-1}\) denotes the surface area of the unit sphere in \({\mathbb {R}}^N\). More precisely, we study the effect of the parameter a to the attainability of \(MT_{N}(a,\beta )\). We will prove that for each \(\beta \in [0,N)\) there exist the thresholds \(a_*(\beta )\) and \(a^*(\beta )\) such that \(MT_{N}(a,\beta )\) is attained for any \(a \in (a_*(\beta ), a^*(\beta ))\) and is not attained for \(a < a_*(\beta )\) or \(a > a^*(\beta )\). We also give some qualitative estimates for \(a_*(\beta )\) and \(a^*(\beta )\). Our results complete the recent studies on the sharp Moser–Trudinger type inequality under constraints due to do Ó, Sani and Tarsi (Commun Contemp Math 19:27, 2016), Lam (Proc Am Math Soc 145:4885–4892, 2017; Math Nachr 291(14–15):2272–2287, 2018) and Ikoma, Ishiwata and Wadade (Math Ann 373(1–2):831–851, 2019).
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The author would like to thank anonymous referee for the useful and constructive comments and suggestions which improve the presentation of this paper.
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Communicated by Y. Giga.
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Nguyen, V. The thresholds of the existence of maximizers for the critical sharp singular Moser–Trudinger inequality under constraints. Math. Ann. 380, 1933–1958 (2021). https://doi.org/10.1007/s00208-020-02010-8
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DOI: https://doi.org/10.1007/s00208-020-02010-8