Sharp Lp-Lq estimate for the spectral projection associated with the twisted Laplacian

Main Article Content

Eunhee Jeong
Sanghyuk Lee
Jaehyeon Ryu

In this note we are concerned with estimates for the spectral projection operator Pµ associated with the twisted Laplacian L. We completely characterize the optimal bounds on the operator norm of Pµ from Lp to Lq when 1 ≤ p ≤ 2 ≤ q ≤ ∞. As an application, we obtain a uniform resolvent estimate for L.

Keywords
twisted Laplacian, spectral projection

Article Details

How to Cite
Jeong, Eunhee et al. “Sharp Lp-Lq estimate for the spectral projection associated with the twisted Laplacian”. Publicacions Matemàtiques, 2022, vol.VOL 66, no. 2, pp. 831-55, https://raco.cat/index.php/PublicacionsMatematiques/article/view/402271.
References
J.-G. Bak, Sharp estimates for the Bochner–Riesz operator of negative order in R2 , Proc. Amer. Math. Soc. 125(7) (1997), 1977–1986. DOI: 10.1090/S0002-9939-97-03723-4

L. Borjeson, Estimates for the Bochner–Riesz operator with negative index, Indiana Univ. Math. J. 35(2) (1986), 225–233. DOI: 10.1512/iumj.1986.35.35013

A. Carbery, A. Seeger, S. Wainger, and J. Wright, Classes of singular integral operators along variable lines, J. Geom. Anal. 9(4) (1999), 583–605. DOI: 10.1007/BF02921974

J.-C. Cuenin, Sharp spectral estimates for the perturbed Landau Hamiltonian with Lp potentials, Integral Equations Operator Theory 88(1) (2017), 127–141. DOI: 10.1007/s00020-017-2367-9

L. Escauriaza and L. Vega, Carleman inequalities and the heat operator II, Indiana Univ. Math. J. 50(3) (2001), 1149–1169. DOI: 10.1512/iumj.2001.50.1937

C. L. Frenzen and R. Wong, Uniform asymptotic expansions of Laguerre polynomials, SIAM J. Math. Anal. 19(5) (1988), 1232–1248. DOI: 10.1137/0519087

L. Hormander, The spectral function of an elliptic operator, Acta Math. 121 (1968), 193–218. DOI: 10.1007/BF02391913.

E. Jeong, Y. Kwon, and S. Lee, Uniform Sobolev inequalities for second order non-elliptic differential operators, Adv. Math. 302 (2016), 323–350. DOI: 10.1016/j.aim.2016.07.016

E. Jeong, S. Lee, and J. Ryu, Hermite spectral projection operator, Preprint (2021). arXiv:2006.11762

E. Jeong, S. Lee, and J. Ryu, Unique continuation for the heat operator with potentials in weak spaces, Preprint (2021). arXiv:2109.10564

M. Keel and T. Tao, Endpoint Strichartz estimates, Amer. J. Math. 120(5) (1998), 955–980. DOI: 10.1353/ajm.1998.0039

C. E. Kenig, A. Ruiz, and C. D. Sogge, Uniform Sobolev inequalities and unique continuation for second order constant coefficient differential operators, Duke Math. J. 55(2) (1987), 329–347. DOI: 10.1215/S0012-7094-87-05518-9

H. Koch and F. Ricci, Spectral projections for the twisted Laplacian, Studia Math. 180(2) (2007), 103–110. DOI: 10.4064/sm180-2-1

H. Koch and D. Tataru, Carleman estimates and unique continuation for second order parabolic equations with nonsmooth coefficients, Comm. Partial Differential Equations 34(4-6) (2009), 305–366. DOI: 10.1080/03605300902740395

B. Muckenhoupt, Mean convergence of Hermite and Laguerre series. I, II, Trans. Amer. Math. Soc. 147 (1970), 419–431. DOI: 10.1090/s0002-9947-1970-99933-9; ibid. 147 (1970), 433–460. DOI: 10.1090/S0002-9947-1970-0256051-9

A. Nowak and K. Stempak, Potential operators and Laplace type multipliers associated with the twisted Laplacian, Acta Math. Sci. Ser. B (Engl. Ed.) 37(1) (2017), 280–292.
DOI: 10.1016/S0252-9602(16)30130-8

F. W. Olver “Asymptotics and Special Functions”, Reprint of the 1974 original, AKP Classics, A K Peters, Ltd., Wellesley, MA, 1997. DOI: 10.1201/9781439864548

W.-Y. Qiu and R. Wong, Global asymptotic expansions of the Laguerre polynomials—a Riemann–Hilbert approach, Numer. Algorithms 49(1-4) (2008), 331–372. DOI: 10.1007/s11075-008-9159-x

P. K. Ratnakumar, R. Rawat, and S. Thangavelu, A restriction theorem for the Heisenberg motion group, Studia Math. 126(1) (1997), 1–12

E. M. Stein, “Harmonic Analysis: Real-Variable Methods, Orthogonality, and Oscillatory Integrals”, With the assistance of Timothy S. Murphy, Princeton Mathematical Series 43, Monographs in Harmonic Analysis III, Princeton University Press, Princeton, NJ, 1993. DOI: 10.1515/9781400883929

K. Stempak and J. Zienkiewicz, Twisted convolution and Riesz means, J. Anal. Math. 76 (1998), 93–107. DOI: 10.1007/BF02786931

S. Thangavelu, Weyl multipliers, Bochner–Riesz means and special Hermite expansions, Ark. Mat. 29(1-2) (1991), 307–321. DOI: 10.1007/BF02384344

S. Thangavelu, “Lectures on Hermite and Laguerre Expansions”, With a preface by Robert S. Strichartz, Mathematical Notes 42, Princeton University Press, Princeton, NJ, 1993. DOI: 10.1515/9780691213927

S. Thangavelu, Hermite and special Hermite expansions revisited, Duke Math. J. 94(2) (1998), 257–278. DOI: 10.1215/S0012-7094-98-09413-3

S. Thangavelu, Poisson transform for the Heisenberg group and eigenfunctions of the sublaplacian, Math. Ann. 335(4) (2006), 879–899. DOI: 10.1007/s00208-006-0769-0