5. Subelliptic Pseudo-differential operators and Fourier integral operators on compact Lie groups
Published in: MSJ Memoirs: Memoirs of the Mathematical Society of Japan
Cited as: Cardona, D., Ruzhansky, M. Subelliptic pseudo-differential operators and Fourier integral operators on compact Lie groups.
MSJ Memoirs, Math. Soc. Japan, 44: 175pp. (2025). arXiv:2008.09651.
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Fields: Analysis and PDE.
Authors: Duván Cardona and Michael Ruzhansky
In this memoir we extend the theory of global pseudo-differential operators to the setting of arbitrary sub-Riemannian structures on a compact Lie group. More precisely, given a compact Lie group and the sub-Laplacian associated to a system of vector fields satisfying the Hormander condition, we introduce a subelliptic pseudo-differential calculus associated to the operator L, based on the matrix-valued quantisation process developed in reference one hundred thirty-eight. This theory will be developed as follows. First, we investigate the singular kernels of this calculus, estimates of Lp to Lp, H1 to L1, Linfinity to BMO type, and also the weak one-one boundedness of these subelliptic Hormander classes. Among the obtained estimates we prove subelliptic versions of the celebrated sharp Fefferman Lp theorem and the Calderon-Vaillancourt theorem.