Sharp Logarithmic Ultra-analyticity for Fractional and Nonlocal Elliptic Equations

Abstract

It is well known that solutions of elliptic equations inherit analyticity from analytic coefficients, while much less is understood about the inheritance of ultra-analytic regularity, especially for nonlocal equations. This paper develops a systematic Fourier-analytic framework to study fractional and more general nonlocal pure-potential equations whose potentials satisfy ultra-analytic derivative bounds. We prove sharp quantitative logarithmic ultra-analytic estimates for normalized solutions, and show that both the logarithmic power and the leading constant involving the fractional exponent are optimal in natural periodic model examples. We also establish a general transfer principle for weighted ultra-analytic scales, which reveals why standard scales are not preserved, and singles out a natural family of invariant ultra-analytic spaces.