Logarithmic Trace of Toeplitz Projectors
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In this paper, it was shown that the Toeplitz logarithmic trace vanishes identically for all contact forms on the three-sphere and that the invariance of the Szego kernel only depends on the contact structure defined by the boundary pseudo-convex CR structure.Abstract:
In [6] we defined Toeplitz projectors on a compact contact manifold, which are analogues of the Szego projector on a strictly pseudo-convex boundary. The kernel of a Toeplitz projector, as the Szego kernel, has a holonomic singularity including a logarithmic term. The coefficient of the logarithmic term is well defined, so as its trace (the integral over the diagonal). Here we show that this trace only depends on the contact structure and not on the choice of the Toeplitz operator (for a given contact structure there are many possible choices). This generalizes a result of K. Hirachi [16] for the Szego kernel, and also shows that his invariant (the trace of the logarithmic coefficient of the Szego kernel) only depends on the contact structure defined by the boundary pseudo-convex CR structure. Finally we show that the Toeplitz logarithmic trace vanishes identically for all contact forms on the three-sphere.read more
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Heisenberg Calculus and Spectral Theory of Hypoelliptic Operators on Heisenberg Manifolds
TL;DR: In this article, the authors introduce the Heisenberg manifolds and their main differential operators, and present an intrinsic approach to the heisenberg calculus and the complex powers of hypoelliptic operators.
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Noncommutative residue invariants for CR and contact manifolds
TL;DR: In this paper, the non-commutative residue traces of various geometric projections are used to derive new invariants for CR and contact manifolds, including the generalized Szego projections on forms.
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Vanishing of the logarithmic trace of generalized Szegö projectors
TL;DR: The logarithmic trace of Szego projectors introduced by K. Hirachi [15] for CR structures and extended in [8] to contact structures vanishes identically as discussed by the authors.
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Noncommutative residue invariants for CR and contact manifolds
TL;DR: In this paper, the non-commutative residue traces of various geometric projections are used to derive new invariants for CR and contact manifolds, including the generalized Szego projections on forms.
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Some notes on analytic torsion of the Rumin complex on contact manifolds
TL;DR: In this paper, the analytic torsion of the Rumin complex on contact manifolds is defined as the derivative at zero of a well-chosen combination of zeta functions of a fourth-order modified Rumin Laplacian.
References
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