Abstract
The goal of this paper is to emphasize ideas coming from microlocal analysis to refine the study of lack of compactness in critical Sobolev embedding. In particular, we shall highlight that the elements involving in the characterization of the defect of compactness of critical Sobolev embedding in Lebesgue spaces in [13] are of different kinds than the ones intervening in the study of the critical Sobolev embedding of \( H^1(\mathbb{R}^2)\) intoth e Orlicz space \( \mathcal{L}(\mathbb{R}^2)\) in [9]; although in the two frameworks the obstruction to compactness is expressed in the same manner in terms of defect measures. This observation is based on the characterization of these embedding by means of asymptotic decompositions and puts in light the relevance of microlocal analysis behind this approach.
Mathematics Subject Classification (2010). 35A25.
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Bahouri, H. (2013). On the Elements Involved in the Lack of Compactness in Critical Sobolev Embedding. In: Adimurthi, ., Sandeep, K., Schindler, I., Tintarev, C. (eds) Concentration Analysis and Applications to PDE. Trends in Mathematics. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-0373-1_1
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