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arxiv: 0705.0950 · v1 · submitted 2007-05-07 · 🧮 math.AP

Contraction semigroups of elliptic quadratic differential operators

classification 🧮 math.AP
keywords operatorsquadraticellipticcontractiondifferentialsemigroupssymbolsweyl
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We study the contraction semigroups of elliptic quadratic differential operators. Elliptic quadratic differential operators are the non-selfadjoint operators defined in the Weyl quantization by complex-valued elliptic quadratic symbols. We establish in this paper that under the assumption of ellipticity, as soon as the real part of their Weyl symbols is a non-zero non-positive quadratic form, the norm of contraction semigroups generated by these operators decays exponentially in time.

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