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Transaction of the American Mathematical Society. 359, 7 (2007) 3085-3097
Nash type inequalities for fractional powers of non-negative self-adjoint operators
Alexander Bendikov 1, Patrick Maheux 2
(25/01/2007)

Assuming that a Nash type inequality is satisfied by a non-negative self-adjoint operator$A$, we prove a Nash type inequality for the fractional powers $A^{\alpha}$ of $A$. Under someassumptions, we give ultracontractivity bounds for the semigroup $(T_{t,{\alpha}})$ generated by $-A^{\alpha}$.
1 :  Department of Mathematics (Department of Mathematics)
Department of Mathematics,Cornell University – Cornell University
2 :  Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO)
Université d'Orléans – CNRS : UMR7349
Mathématiques/Théorie spectrale
Nash inequality – Fractional powers of operators – Semigroup of operators – logarithmic Sobolev inequality – Ultracontractivity property – Dirichlet form.
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