Research
Publications
Semiclassical asymptotics in quantum mechanics
- Classical-Quantum correspondence in Lindblad evolution
with Maciej Zworski. 2403.09345.
- Propagation for Schrodinger operators with potentials singular along a hypersurface
with Jared Wunsch. arXiv2302.08154 Arch. Ration. Mech. Anal. 248 (2024), no. 3, Paper No. 37, 28 pp.
- Asymptotics for the spectral function on Zoll manifolds
with Yaiza Canzani and Blake Keeler. arXiv2211.09644
- Logarithmic improvements in the Weyl law and exponential bounds on the number of closed geodesics are predominant
with Yaiza Canzani. arXiv2204.11921
- Weyl remainders: an application of geodesic beams with Yaiza Canzani. arXiv2010.03969 to appear in Invent. Math.
- Growth of high L^p norms for eigenfunctions: an application of geodesic beams with Yaiza Canzani. arXiv2003.04597. to appear in Anal. PDE.
- Lower bounds for Cauchy data on curves in a negatively curved surface with Steve Zelditch. arXiv2002.09456. to appear in Israel J. Math.
- Eigenfunction concentration via geodesic beams with Yaiza Canzani. arXiv1903.08461. to appear in J. Reine Angew. Math.
- Pointwise bounds for joint eigenfunctions of quantum completely integrable systems with John Toth. Comm. Math. Phys. 375(2):915-947, 2020.
- Improvements for eigenfunction averages: An application of geodesic beams with Yaiza Canzani. arXiv1809.06296 to appear in J. Differ. Geom.
- A microlocal approach to eigenfunction concentration. Journées équations aux dérivées partielles (2018): 1-14. arXiv1809.08677.
- Control from an interior hypersurface with M. Leautaud. Trans. Amer. Math. Soc. 273(5):3177-3233, 2020.
- On the growth of eigenfunction averages: microlocalization and geometry with Yaiza Canzani. Duke Math. J. 168(16):2991–3055, 2019.
- Averages of eigenfunctions over hypersurfaces with Yaiza Canzani and John Toth. Comm. Math. Phys., 360(2):619-637, 2018.
- Defect measures of eigenfunctions with maximal L^\infty growth . Annales de L'institut Fourier 69(4):1757--1798, 2019.
- Eigenfunction scarring and improvements in L^\infty growth with John Toth. Anal. PDE, 11(3):801-812, 2018.
- The L^2 behavior of eigenfunctions near the glancing set. Comm. Partial Differential Equations, 41(10):1619-1648, 2016.
Asymptotics of Steklov eigenvalues and eigenfunctions
Numerical analysis of the Helmholtz Equation
- Sharp error bounds for edge-element discretisations of the high-frequency Maxwell equations. with Theophile Chaumont-Frelet and Euan Spence arXiv2408.04507
- Convergence of overlapping domain decomposition methods with PML transmission conditions applied to nontrapping Helmholtz problems. with Shihua Gong, Ivan Graham, David Lafontaine, and Euan Spence arXiv2404.02156
- Helmholtz FEM solutions are locally quasi-optimal modulo low frequencies. with Martin Averseng and Euan Spence arXiv2304.14737
- Sharp preasymptotic error bounds for the Helmholtz h-FEM. with Euan Spence arXiv2301.03574, to appear in SINUM.
- Lower bounds for piecewise polynomial approximations of oscillatory functions. arXiv2211.04757, to appear in J. Approx. Theory.
- The hp-FEM applied to the Helmholtz equation with PML truncation does not suffer from the pollution effect . with David Lafontaine, Euan Spence, and Jared Wunsch. 2207.05542
- Does the Helmholtz boundary element method suffer from the pollution effect?. with Euan Spence. arXiv2201.09721, SIAM Rev. 65(2023), no.3, 806–828.
- Perfectly-matched-layer truncation is exponentially accurate at high frequency with David Lafontaine and Euan Spence. arXiv2105.07737
SIAM J. Math. Anal.
- Applying GMRES to the Helmholtz equation with strong trapping: how does the number of iterations depend on the frequency?. with Pierre Marchand, Alastair Spence, Euan Spence. arXiv2102.05367 Adv. Comput. Math. 48 (2022), no. 4, Paper No. 37, 63 pp.. Math.
- Eigenvalues of the truncated Helmholtz solution operator under strong trapping. with Pierre Marchand and Euan Spence. arXiv2101.02116 SIAM J. Math. Anal. 53 (2021), no. 6, 6724-6770.
- Decompositions of high-frequency Helmholtz solutions via functional calculus, and application to the finite element method with David Lafontaine, Euan Spence, and Jared Wunsch. arXiv2102.13081 SIAM J. Math. Anal. 55 (2023), no. 4, 3903–3958.
- Local absorbing boundary conditions on fixed domains give order-one errors for high-frequency waves with David Lafontaine and Euan Spence. arXiv2101.02154 to appear in IMA J. Numer. Anal.
- Wavenumber-explicit analysis for the Helmholtz h-BEM error estimates and iteration counts for the Dirichlet problem with Eike Muller and Euan Spence. Numer. Math, 142(2):329-357, 2019.
Mathematics of solid state physics
Mathematical scattering theory
- The scattering phase: seen at last. with Pierre Marchand, Jian Wang, and Maciej Zworski. arXiv2210.09908
SIAM J. Appl. Math. 84 (2024), no. 1, 246–261.
- Classical Wave methods and modern gauge transforms: Spectral Asymptotics
in the one dimensional case. with Leonid Parnovski and Roman Shterenberg. Geom. Funct. Anal. 33 (2023), no. 6, 1454–1538. arXiv2207.08245
- Semiclassical resolvent bounds for compactly supported radial potentials. with Kiril Datchev and Jacob Shapiro. arXiv2112.15133, J. Funct. Anal. 284 (2023), no. 7, Paper No. 109835, 28 pp.
- Complete asymptotic expansions of the spectral function for symbolic
perturbations of almost periodic Schrodinger operators in dimension one. arXiv2011.09245 J. Spectr. Theory 12 (2022), no. 1, 105–142.
- Semiclassical resolvent bounds for long range Lipschitz potentials with Jacob Shapiro. arXiv2010.01166 tInt. Math. Res. Not. IMRN(2022), no. 18, 14134–14150.
- Outgoing solutions via Gevrey-2 properties with Maciej Zworski. arXiv2004.07868 Ann. PDE 7 (2021), no. 1, Paper No. 5, 13 pp.
- Analytic hypoellipticity of Keldysh operators with Maciej Zworski. arXiv2003.08106 Proc. Lond. Math. Soc. (3) 123 (2021), no. 5, 498–516.
- Semiclassical resolvent bounds for weakly decaying potentials with Jacob Shapiro. arXiv2003.02525. Math. Res. Lett. 29 (2022), no. 2, 373–397.
- Viscosity limits for 0th order pseudodifferential operators with Maciej Zworski. arXiv1912.09840, Comm. Pure Appl. Math. 75 (2022), no. 8, 1798–1869.
- An introduction to complex microlocal deformations with Maciej Zworski. arXiv1912.09845 (an expository companion to arXiv1912.09840).
- Optimal constants in non-trapping resolvent estimates and applications in numerical analysis with Euan Spence and Jared Wunsch. Pure and Applied Analysis. 2(1): 157-202, 2020.
- On non-diffractive cones with Jared Wunsch. arXiv1807.05043 J. Differential Geom. 120 (2022), no. 3, 505–518.
- Fractal Weyl laws and wave decay for general trapping with Semyon Dyatlov. Nonlinearity, 30(12):4301-4343. 2017.
- A quantitative Vaniberg method for black box scattering. Comm. Math. Phys.. 349(2):527-549, 2017/
- The quantum Sabine law for resonances in transmission problems. Pure and Applied Analysis, 1(1):27-100, 2019.
- Resonances for thin barriers on the circle. J. Phys. A, 49(12):125205, 22, 2016..
- Distribution of resonances in scattering by thin barriers. Mem. Amer. Math. Soc., 259(1248):ix + 152, 2019.
- Restriction bounds for the free resolvent and resonances in lossy scattering with H. Smith. Int. Math. Res. Not., (16):7473-7509, 2015.
Analysis of boundary integral operators and boundary layer potentials
Quantum chaos
Pseudospectral effects in non-self-adjoint problems
Other Research