It has been shown [1,2,9,10] that for several nilpotent Gelfand pairs (N,K) (i.e., with N a nilpotent Lie group, K a compact group of automorphisms of N and the algebra L1(N)K commutative) the spherical transform establishes a 1-to-1 correspondence between the space S(N)K of K-invariant Schwartz functions on N and the space S(Σ) of functions on the Gelfand spectrum Σ of L1(N)K which extend to Schwartz functions on Rd, once Σ is suitably embedded in Rd. We call this property (S). We present here a general bootstrapping method which allows to establish property (S) to new nilpotent pairs (N,K), once the same property is known for a class of quotient pairs of (N,K) and a K-invariant form of Hadamard formula holds on N. We finally show how our method can be recursively applied to prove property (S) for a significant class of nilpotent Gelfand pairs.

Nilpotent Gelfand pairs and Schwartz extensions of spherical transforms via quotient pairs

Ricci, Fulvio;
2018

Abstract

It has been shown [1,2,9,10] that for several nilpotent Gelfand pairs (N,K) (i.e., with N a nilpotent Lie group, K a compact group of automorphisms of N and the algebra L1(N)K commutative) the spherical transform establishes a 1-to-1 correspondence between the space S(N)K of K-invariant Schwartz functions on N and the space S(Σ) of functions on the Gelfand spectrum Σ of L1(N)K which extend to Schwartz functions on Rd, once Σ is suitably embedded in Rd. We call this property (S). We present here a general bootstrapping method which allows to establish property (S) to new nilpotent pairs (N,K), once the same property is known for a class of quotient pairs of (N,K) and a K-invariant form of Hadamard formula holds on N. We finally show how our method can be recursively applied to prove property (S) for a significant class of nilpotent Gelfand pairs.
Settore MAT/05 - Analisi Matematica
Analysis on nilpotent Lie groups; Fourier and spectral multipliers; Gelfand pairs and spherical transform; Invariants;
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/68624
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