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Suitable domains to define fractional integrals of Weyl via fractional powers of operators

Celso Martínez;  Antonia Redondo;  Miguel Sanz — 2011

Studia Mathematica

We present a new method to study the classical fractional integrals of Weyl. This new approach basically consists in considering these operators in the largest space where they make sense. In particular, we construct a theory of fractional integrals of Weyl by studying these operators in an appropriate Fréchet space. This is a function space which contains the L p ( ℝ ) -spaces, and it appears in a natural way if we wish to identify these fractional operators with fractional powers of a suitable non-negative...

Fractional Powers of Almost Non-Negative Operators

Martínez, Celso;  Sanz, Miguel;  Redondo, Antonia — 2005

Fractional Calculus and Applied Analysis

Mathematics Subject Classification: Primary 47A60, 47D06. In this paper, we extend the theory of complex powers of operators to a class of operators in Banach spaces whose spectrum lies in C ]−∞, 0[ and whose resolvent satisfies an estimate ||(λ + A)(−1)|| ≤ (λ(−1) + λm) M for all λ > 0 and for some constants M > 0 and m ∈ R. This class of operators strictly contains the class of the non negative operators and the one of operators with polynomially bounded resolvent. We also prove...

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