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# Wydawnictwa / Czasopisma IMPAN / Colloquium Mathematicum / Wszystkie zeszyty

## Sharp spectral multipliers for Hardy spaces associated to non-negative self-adjoint operators satisfying Davies–Gaffney estimates

### Tom 133 / 2013

Colloquium Mathematicum 133 (2013), 51-65 MSC: Primary 42B15; Secondary 42B20, 42B30, 47F05. DOI: 10.4064/cm133-1-4

#### Streszczenie

We consider an abstract non-negative self-adjoint operator $L$ acting on $L^2(X)$ which satisfies Davies–Gaffney estimates. Let $H^p_L(X)$ $(p>0)$ be the Hardy spaces associated to the operator $L$. We assume that the doubling condition holds for the metric measure space $X$. We show that a sharp Hörmander-type spectral multiplier theorem on $H^p_L(X)$ follows from restriction-type estimates and Davies–Gaffney estimates. We also establish a sharp result for the boundedness of Bochner–Riesz means on $H^p_L(X)$.

#### Autorzy

• Peng ChenSchool of Information Technology and Mathematical Sciences
University of South Australia