On a fractional Nirenberg equation: compactness and existence results
DOI:
https://doi.org/10.33044/revuma.3833Abstract
This paper deals with a fractional Nirenberg equation of order $\sigma\in (0, n/2)$, $n\geq2$. We study the compactness defect of the associated variational problem. We determine precise characterizations of critical points at infinity of the problem, through the construction of a suitable pseudo-gradient at infinity. Such a construction requires detailed asymptotic expansions of the associated energy functional and its gradient. This study will then be used to derive new existence results for the equation.
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