Abstract
The first part of this article studies the integral and maximal operators associated with fundamental solutions of Dirac operators on Clifford bundles. The main goal is to obtain explicit estimates for integral transforms of this kind in terms of the corresponding maximal functions. As direct cones-quences of such estimates one derives several quantitative Hartogs-Rosenthal type theorems concerning monogenic approximation on compact sets.
The second part illustrates a Clifford analysis approach to the theory of seminormal systems of Hilbert space operators. The four existing concepts of joint seminormality are reevaluated by assuming that the remainders in some Bochner-Kodaira identities are semidefinite, and a new concept is introduced based on a Bochner-Weitzenböck identity. A rather general singular integral model of jointly seminormal pairs of systems of self-adjoint operators that involves Riesz transforms is presented, and a Putnam type commutator inequality for that model is proved.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Ahlfors, L. and Beurling, A., Conformal invariants and function theoretic null sets, Acta Math 83 (1950), 101–129.
Alexander, H., Projections of polynomial hulls, J. Funct. Anal. 13 (1973), 13–19.
Alexander, H., On the area of the spectrum of an element of a uniform algebra. In Complex Approximation Proceedings, Quebec, July 3–8, 1978, Birkhäuser, 1980, 3–12.
Aronszajn, N., A unique continuation theorem for solutions of elliptic partial differential equations or inequalities of second order, J. Math. Pures Appl. 36 (1957), 235–249.
Athavale, A., On joint hyponormal operators, Proc. Amer. Math. Soc. 103 (1988), 417–423.
Axler, S. and Shapiro, J. H., Putnam’s theorem, Alexander’s spectral area estimate, and VMO, Math. Ann. 271 (1985), 161–183.
Berline, H., Getzler, E., and Vergne, M., Heat Kernels and Dirac Operators, Grundlehren der Mathematischen Wissenschaften, 298, Springer Verlag, New York, 1992.
Bochner, S., Curvature and Betti numbers. I; II, Ann. of Math. 49 (1948), 379–390; 50 (1949), 79–93.
Bochner, S. and Yano, K. Curvature and Betti Numbers, Ann. of Math. Studies 32, Princeton University Press, Princeton, 1953.
Brackx, F., Delanghe, R., and Sommen, F., Clifford Analysis, Pitman Research Notes in Mathematics Series 76, 1982.
Calderbank, D. M. J., Dirac operators and Clifford analysis on manifolds with boundary, Odense Universitet, Preprint 53, 1997.
Clancey, K. F., Seminormal Operators, Lecture Notes in Math. 742, Springer Verlag, 1979.
Cho, M., Curto, R. E., Huruya, T., and Zelazko, W., Cartesian form of Putnam’s inequality for doubly commuting n-tuples, Indiana Univ. Math. J. 49 (2000),1437–1448.
Cnops, J., An Introduction to Dirac Operators on Manifolds, Progress in Mathematical Physiscs, Birkhäuser, Basel, 2002.
Conway, J. B., The Theory of Subnormal Operators, Mathematical Surveys and Monographs, 36, American Mathematical SocietyProvidence, RI, 1991.
Curto, R. E. Joint hyponormality: a bridge between hyponormality and subnor-mality, in Operator Theory, Operator Algebras and Applications, W. B. Arveson and R. G. Douglas (eds.); Part 2, Proc. Sympos. Pure Math. 51 (1990), 69–91.
Curto, R. E. and Jian, R. A matricial identity involving the self-commutator of a commuting n-tuple, Proc. Amer. Math. Soc. 121 (1994), 461–464.
Curto, R. E., Muhly, P. A., and Xia, J., Hyponormal pairs of commuting operators, in Operator Theory: Advances and Applications 35, Springer Basel AG, 1988, 1–22.
Delanghe, R., Sommen, F., and Soucek, V., Clifford Algebra and Spinor-Valued Functions, Kluwer Academic Publishers, 1992.
Douglas, R. G., Paulsen, V., and Yan, K., Operator theory and algebraic geometry, Bull. Amer. Math. Soc. 20 (1988), 67–71.
Friedrich, T., Dirac Operators in Riemannian Geometry, Graduate Studies in Mathematics 25, Amer. Math. Soc., Providence, RI, 2000.
Gilbert, J. E. and Murray, M. A. M., Clifford Algebras and Dirac Operators in Harmonic Analysis, Cambridge Studies in Advanced Mathematics 26, Cambridge University Press, 1991.
Gilkey, P. B., The spectral geometry of a Riemann manifold, J. Diff. Geom. 10 (1975), 601–608.
Gilkey, P. B., Leahy, J. V., and Park, JH., Spectral Geometry, Riemannian Submersions, and the Gromov-Lawson Conjecture, CRC Press, Boca Raton, FL, 1999.
Goldberg, R., Curvature and Homology, Academic Press, New York, London, 1962.
Gürlebeck, K. and Sprössig, W., Quaternionic Analysis and Elliptic Boundary Value Problems, Birkhäuser, Basel, 1990.
Gürlebeck, K. and Sprössig, W.Quaternionic and Clifford Calculus for Physicists cists and Engineers, John Wiley & Sons, New York, 1997.
Hedberg, L., On certain convolution inequalities, Proc. Amer. Math. Soc. 36 (1972), 505–510.
Kato, T., Smooth operators and commutators, Studia Math. 31 (1968), 531–546.
Lawson, H. B. and Michelson, M.-L., Spin Geometry, Princeton Mathematical Series, 38, Princeton University Press, Princeton, 1989.
Lieb, E. H., Sharp constants in the Hardy-Littlewood-Sobolev and related inequalities, Annals of Math. 118 (1983) 349–379.
Martin, M., Joint seminormality and Dirac operators, Integral Equations Operator Theory 30 (1998), 101–121.
Martin, M., Higher-dimensional Ahlfors-Beurling inequalities in Clifford analysis, Proc. Amer. Math. Soc. 126 (1998), 2863–2871.
Martin, M., Convolution and maximal operator inequalities in Clifford analysis, in Clifford Algebras and Their Applications in Mathematical Physics, Vol. 2: Clifford Analysis, Progress in Physics 9, Springer Basel AG, Basel, 2000, 95–113.
Martin, M., Self-commutator inequalities in higher dimension, Proc. Amer. Math. Soc. 130 (2002), 2971–2983.
Martin, M., Uniform approximation by closed forms in several complex variables, preprint, 2002.
Martin M. and Putinar, M., Lectures on Hyponormal Operators, Operator Theory: Advances and Applications 39, Springer Basel AG, Basel, 1989.
Martin, M. and Salinas, N., Weitzenböck type formulas and joint seminormality, Contemporary Math., Amer. Math. Soc. 212 (1998), 157–167.
Martin, M. and Szeptycki, P., Sharp inequalities for convolution operators with homogeneous kernels and applications, Indiana Univ. Math. J. 46 (1997), 975–988.
McCullough, S. and Paulsen, V., A note on joint hyponormality, Proc. Amer. Math. Soc. 107 (1989), 187–195.
McIntosh, A., Operators which have a H ∞ functional calculus, in Miniconference on Operator Theory and Partial Differential Equations, 1986, Proceedings of the Centre for Mathematical Analysis, ANU, Canberra 14 (1986), 210–23
McIntosh, A., Clifford algebras, Fourier theory, singular integrals, and harmonic functions on Lipschitz domains, in Clifford Algebras in Analysis and Related Topics, J. Ryan (Ed.), CRC Press, Boca Raton, FL, 1995.
McIntosh, A. and Pryde, A., A functional calculus for several commuting operators, Indiana Univ. Math. J. 36 (1987), 421–439.
McIntosh, A., Pryde, A., and Ricker, W., Comparison of joint spectra for certain classes of commuting operators, Studia Math. 88 (1988), 23–36.
Mitrea, M., Singular Integrals, Hardy Spaces, and Clifford Wavelets,Lecture Notes in Mathematics, 1575, Springer-Verlag, Heidelberg, 1994.
Muhly, P. S., A note on commutators and singular integrals, Proc. Amer. Math. Soc. 54 (1976), 117–121.
Pincus, J. D., Commutators and systems of singular integral equations, Acta Math. 121 (1968), 219–249.
Pincus, J. D. and Xia, D., The analytic model of a hyponormal operator with rank one self-commutator, Integral Equations Operator Theory 4 (1981), 134–150.
Pincus, J. D., Xia, D., and Xia, J., The analytic model of a hyponormal operator with rank one self-commutator, Integral Equations Operator Theory 7 (1984), 516–535.
Putinar, M., Extreme hyponormal operators, Operator Theory: Advances and Applications 28 (1988), 249–265.
Putnam, C. R., Commutation Properties of Hilbert Space Operators and Related Topics, Springer-Verlag, Berlin, Heidelberg, New York, 1967.
Putnam, C. R., An inequality for the area of hyponormal spectra, Math. Z. 116 (1970), 323–330.
Roe, J., Elliptic Operators, Topology, and Asymptotic Methods, 2nd ed., Pitman Research Notes, 395, Longman, 1998.
Ryan, J. (Ed.), Clifford Algebras in Analysis and Related Topics, CRC Press, Boca Raton, FL, 1995.
Ryan, J., Dirac operators, conformal transformations and aspects of classical harmonic analysis, Journal of Lie Theory 8 (1998), 67–82.
Ryan, J. and Sprößig, W. (Eds.), Clifford Algebras and Their Applications in Mathematical Physics, Volume 2: Clifford Analysis, Progress in Physics 19, Birkhäuser, Basel, 2000.
Stein, E. M., Singular Integrals and Differentiability Properties of Functions, Princeton Univ. Press, Princeton, NJ„ 1970.
Stein, E. M., Harmonic Analysis: Real-Variable Methods, Orthogonality, and Oscillatory Integrals, Princeton Univ. Press, Princeton, NJ, 1993.
Tarkhanov, N. N., The Cauchy Problem for Solutions of Elliptic Equations, Akademie Verlag, Berlin, 1995.
D. Xia, On non-normal operators. I, Chinese J. Math. 3(1963), 232–246; II, Acta Math. Sinica 21 (1987), 103–108.
D. Xia, Spectral Theory of Hyponormal Operators, Springer Basel AG, Basel Boston-Stuttgart, 1983.
D. Xia, On some classes of hyponormal tuples of commuting operators, in Operator Theory: Advances and Applications 48, Springer Basel AG, 1990, 423–448.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2004 Springer Basel AG
About this chapter
Cite this chapter
Martin, M. (2004). Spin Geometry, Clifford Analysis, and Joint Seminormality. In: Qian, T., Hempfling, T., McIntosh, A., Sommen, F. (eds) Advances in Analysis and Geometry. Trends in Mathematics. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-7838-8_12
Download citation
DOI: https://doi.org/10.1007/978-3-0348-7838-8_12
Publisher Name: Birkhäuser, Basel
Print ISBN: 978-3-0348-9589-7
Online ISBN: 978-3-0348-7838-8
eBook Packages: Springer Book Archive