Abstract
The connection between Clifford analysis and the Weyl functional calculus for ad-tuple of bounded selfadjoint operators is used to prove a geometric condition due to J. Bazer and D.H.Y. Yen for a point to be in the support of the Weyl functional calculus for a pair of hermitian matrices. Examples are exhibited in which the support has gaps.
Similar content being viewed by others
References
R. F. V. Anderson, The Weyl functional calculus,J. Fund. Anal. 4 (1969), 240–267.
M. Atiyah, R. Bott, L. Gårding, Lacunas for hyperbolic differential operators with constant coefficients I,Ada Math. 124 (1970), 109–189.
M. Atiyah, R. Bott, L. Gårding, Lacunas for hyperbolic differential operators with constant coefficients II,Acta Math. 131 (1973), 145–206.
J. Bazer and D. H. Y. Yen, The Riemann matrix of (2+l)-dimensional symmetric hyperbolic systems,Comm. Pure Appl. Math. 20 (1967), 329–363.
J. Bazer and D. H. Y. Yen, Lacunas of the Riemann matrix of symmetric-hyperbolic systems in two space variables,Comm. Pure Appl Math. 22 (1969), 279–333.
F. Brackx, R. Delanghe and F. Sommen,Clifford Analysis, Research Notes in Mathematics 76, Pitman, Boston/London/Melbourne, 1982.
I. ColojoarĂ and C. FoiasTheory of Generalized Spectral Operators, Gordon and Breach, Mathematics and Its Applications Vol. 9, New York/London/Paris, 1968.
R. Courant and D. Hilbert,Methods of Mathematical Physics, Vol. 2, Interscience Publishers, New York/London, 1962.
R. Feynman, An operator calculus having applications in quantum electrodynamics,Phys. Rev. 84 (1951), 108–128.
B. Jefferies, The Weyl calculus for hermitian matrices,Proc. Amer. Math. Soc. 124 (1996), 121–128.
B. Jefferies, Exponential bounds for noncommuting systems of matrices,Studia Math. 144 (2001), 197–207.
B. Jefferies and G. W. Johnson, Feynman’s Operational Calculi for Noncommuting Systems of Operators, (submitted for publication).
B. Jefferies and A. McIntosh, The Weyl calculus and Clifford analysis,Bull. Austral. Math. Soc. 57 (1998), 329–341.
B. Jefferies, A. McIntosh and J. Picton-Warlow, The monogenic functional calculus,Studia Math. 136 (1999), 99–119.
B. Jefferies and B. Straub, Lacunas in the support of the Weyl calculus for two hermitian matrices,submitted for publication.
F. John,Plane Waves and Spherical Means Applied to Partial Differential Equations, Interscience Publishers, New York/London, 1955.
F. John,Partial Differential Equations, 4th Ed., Springer-Verlag, Berlin/Heidelberg/New York, 1982.
T. Kato,Perturbation Theory for Linear Operators, 2nd Ed., Springer-Verlag, Berlin/Heidelberg/New York, 1980.
R. Kippenhahn, Über den Wertevorrat einer Matrix,Math. Nachr. 6 (1951), 193–228.
V. V. Kisil, Möbius transformations and monogenic functional calculus,ERA Amer. Math. Soc. 2 (1996), 26–33
V. V. Kisil and E. Ramirez de Arellano, The Riesz-Clifford functional calculus for non-commuting operators and quantum field theory,Math. Methods Appl. Sci. 19 (1996), 593–605.
C. Li, A. McIntosh, T. Qian, Clifford algebras, Fourier transforms and singular convolution operators on Lipschitz surfaces,Rev. Mat. Iberoamericana 10 (1994), 665–721.
V. P. Maslov,Operational Methods, Mir, Moscow, 1976
A. McIntosh, Clifford algebras, Fourier theory, singular integrals, and harmonic functions on Lipschitz domains.Clifford algebras in analysis and related topics (Fayetteville, AR, 1993), 33–87, Stud. Adv. Math., CRC, Boca Raton, FL, 1996.
A. McIntosh and A. Pryde, The solution of systems of operator equations using Clifford algebras, in: Miniconference on Linear Analysis and Function Spaces 1984, 212–222,Proc. Centre for Mathematical Analysis 9, ANU, Canberra, 1985.
A. McIntosh and A. Pryde, A functional calculus for several commuting operators,Indiana U. Math. J. 36 (1987), 421–439.
A. McIntosh, A. Pryde and W. Ricker, Comparison of joint spectra for certain classes of commuting operators,Studia Math. 88 (1988), 23–36.
V. E. Nazaikinskii, V. E. Shatalov and B. Yu Sternin,Methods of Noncommutative Analysis, Studies in Mathematics 22, Walter de Gruyter, Berlin/New York, 1996
E. Nelson, Operants: A functional calculus for non-commuting operators, in:Functional analysis and related fields, Proceedings of a conference in honour of Professor Marshal Stone, Univ. of Chicago, May 1968 (F. E. Browder, ed.), Springer-Verlag, Berlin/Heidelberg/New York, 1970, pp. 172–187.
I. Petrovsky, On the diffusion of waves and lacunas for hyperbolic equations,Mat. Sbornik 17 (1945), 289–368.
J. Ryan, Plemelj formulae and transformations associated to plane wave decompositions in complex Clifford analysis,Proc. London Math. Soc. 64 (1992), 70–94.
F. Sommen, Plane wave decompositions of monogenic functions,Annales Pol. Math. 49 (1988), 101–114.
M. E. Taylor, Functions of several self-adjoint operators,Proc. Amer. Math. Soc. 19 (1968), 91–98.
V. A. Vassiliev,Ramified integrals, singularities and lacunas, Mathematics and Its Applications315, Kluwer, Dordrecht, 1995.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Jefferies, B. Applications of the monogenic functional calculus for noncommuting systems of operators. AACA 11 (Suppl 1), 171–187 (2001). https://doi.org/10.1007/BF03042216
Issue Date:
DOI: https://doi.org/10.1007/BF03042216