Research papers
Prepublication drafts of papers can be downloaded by clicking on
the green "preprint" links. For papers that have appeared in print,
clicking on the blue title will get you the published version
whenever your domain has access.

An explicit mapped tent pitching scheme for Maxwell equations
(with M. Hochsteger, J. Schöberl and C. Wintersteiger) Submitted.

A mass conserving mixed stress formulation for Stokes flow with weakly imposed stress symmetry
(with P. Lederer and J. Schöberl) Submitted.

The DPGstar method
(with L. Demkowicz and B. Keith) Submitted.

Spectral discretization errors in filtered subspace iteration
(with L. Grubišić and J. Ovall). Mathematics of Computation, Volume 89, Number 321, pp. 203228, January 2020 [Preprint]

Simulation of optical fiber amplifier gain using equivalent
short fibers
(with D. Drake, T. Goswami and J. Grosek) Computer Methods in Applied Mechanics and Engineering, DOI: 10.1016/j.cma.2019.112698, October 2019. [Preprint]

A spacetime DPG method for the wave equation in multiple dimensions
(with P. Sepúlveda). In collection "SpaceTime Methods: Applications to Partial Differential Equations" (ISBN: 9783110548488) pp. 117140, 2019. [Preprint]

A mass conserving mixed stress formulation for the Stokes equations
(with P. Lederer and J. Schöberl) IMA Journal of Numerical Analysis, DOI: 10.1093/imanum/drz022 [Preprint]

Analysis of FEAST spectral approximations using the DPG discretization
(with L. Grubišić, J. Ovall and B. Q. Parker). Computational Methods in Applied Mathematics, Volume 19, pp. 251266, DOI: 10.1515/cmam20190030, 2019 [Preprint]

The auxiliary space preconditioner for the de Rham complex
(with M. Neumüller and P. Vassilevski). SIAM Journal on Numerical Analysis, Volume 56, pp. 31963218, 2018 [Preprint]

Dispersion analysis of HDG methods
(with M. Solano and F. Vargas). Journal of Scientific Computation, Volume 77, pp. 17031735, 2018 [Preprint]

A scalable preconditioner for the DPG method
(with A. T. Barker, V. Dobrev, and T. Kolev). SIAM Journal on Scientific Computing, Volume 40, Issue 2, pp. A1187A1203, 2018 [Preprint]

Mapped tent pitching schemes for hyperbolic systems
(with J. Schöberl and C. Wintersteiger). SIAM Journal on Scientific Computing, Vol. 39, No. 6, pp. B1043B1063, 2017 [Preprint]

A spacetime DPG method for the Schrödinger equation
(with L. Demkowicz, S. Nagaraj, and P. Sepúlveda). SIAM Journal on Numerical Analysis, Vol. 55, No. 4, pp. 17401759, 2017 [Preprint]

Reduced test spaces for DPG methods using rectangular elements
(with D. Drake and A. Harb). Computers and Mathematics with Applications, DOI:10.1016/j.camwa.2017.06.046, 2017 [Preprint]

Scattering of electromagnetic waves by thin high contrast dielectrics II
(with D. M. Ambrose, S. Moskow and S. Rome). Communications in Mathematical Sciences, Vol. 15, No. 4, pp. 10411053, 2017. [Preprint]

Breaking spaces and forms for the DPG method and applications
including Maxwell equations
(with C. Carstensen and L. Demkowicz). Computers and Mathematics with Applications, Volume 72, Issue 3, pp. 494522, 2016. [Preprint]

Degree and wavenumber [in]dependence of a Schwarz preconditioner for the DPG method
(with J. Schöberl). Spectral and High Order Methods for Partial Differential Equations, Springer, pp. 257265. 2015. Proceedings of the 2014 ICOSAHOM, Salt Lake City, Utah. [Preprint]

A tent pitching scheme motivated by Friedrichs theory
(with P. Monk and P. Sepúlveda). Computers and Mathematics with Applications, Volume 70, Issue 5, pp. 11141135, 2015. [Preprint]

Mathematical model for bone mineralization
(with S. V. Komarova, M. D. McKee, M. Murshed, M.Y Ou, F. Rauch, L. Safranek, and E. Zuhr). Frontiers in Cell and Developmental Biology, Volume 3, Article Number 51 (11 pages), 2015. [Open Access]

Stabilization in relation to wavenumber in HDG methods
(with S. Lanteri, N. Olivares and R. Perrussel). Advanced Modeling and Simulation in Engineering Sciences, Volume 2, Issue 1, Article 13 (24 pages), 2015. [Open Access]

Spectral approximations by the HDG method
(with F. Li, N.C. Nguyen, and J. Peraire). Mathematics of Computation, Volume 84, Number 293, pp. 10371059, 2015. [Preprint]

Convergence rates of the DPG method with reduced test
space degree
(with T. Bouma and A. Harb). Computers and Mathematics with Applications, Volume 68, Issue 11, pp. 15501561, 2014. [Preprint]

A posteriori error control for DPG methods
(with C. Carstensen and L. Demkowicz). SIAM Journal on Numerical Analysis, Volume 52, Number 3, pp. 13351353, 2014. [Preprint]

Dispersive and dissipative errors in the DPG method with scaled norms
for Helmholtz equation
(with I. Muga and N. Olivares). SIAM Journal on Scientific Computing, Volume 36, Number 1, pp. A20A39, 2014. [Preprint]

Multigrid for an HDG method
(with B. Cockburn, O. Dubois, and S. Tan). IMA Journal of Numerical Analysis, Volume 34, Issue 4, pp. 13861425, 2014. [Preprint]

A primal DPG method without a first order reformulation
(with L. Demkowicz). Computers and Mathematics with Applications, Volume 66, Issue 6, pp. 10581064, 2013. [Preprint]

An analysis of the practical DPG method
(with W. Qiu). Mathematics of Computation, Volume 83, No. 286, pp. 537552, 2014. [Preprint]

Nonnegativity of exact and numerical solutions
of some chemotactic models
(with P. De Leenheer and E. Zuhr). Computers and Mathematics with Applications, Volume 66, pp. 356375, 2013. [Preprint]

Instability in a generalized KellerSegel model
(with P. De Leenheer and E. Zuhr). Journal of Biological Dynamics Volume 6, pp. 974991, 2012. [Open Access]

Mixed finite element approximation of the vector Laplacian
with Dirichlet boundary conditions
(with D. N. Arnold and R. S. Falk). Mathematical Models and Methods in Applied Sciences (M3AS), Volume 22, No. 9, Article 1250024 (26 pages), 2012. [Preprint]

A lockingfree hp DPG method for linear elasticity with
symmetric stresses
(with J. Bramwell, L. Demkowicz, and W. Qiu). Numerische Mathematik, Volume 122, Issue 4, pp. 671707, 2012. [Preprint]

Wavenumber explicit analysis for a DPG method for
the multidimensional Helmholtz equation
(with L. Demkowicz, I. Muga, and J. Zitelli). Computer Methods in Applied Mechanics and Engineering, Volume 213/216, pp. 126138, 2012. [Preprint]

Partial expansion of a Lipschitz domain and some applications
(with W. Qiu). Frontiers of Mathematics in China, Volume 7, Issue 2, pp. 249272, 2012. [Preprint]

Convergence analysis of a multigrid algorithm for the acoustic
single layer equation
(with S. Gemmrich and N. Nigam). Applied Numerical Mathematics, Volume 62, pp. 767786, 2012. [Preprint]

Analysis of the DPG method for the Poisson equation
(with L. Demkowicz). SIAM Journal on Numerical Analysis, Volume 49, pp. 17881809, 2011. [Preprint]

Determination of the electric field intensity and space
charge density with height prior to triggered lightning
(with C. Biagi, M. Uman, et al). Journal of Geophysical Research, Volume 116, Article D15201 (15 pages), 2011. [Preprint]

Polynomial extension operators. Part III
(with L. Demkowicz and J. Schöberl). Mathematics of Computation, Volume 81, pp. 12891326, 2012. [Preprint]

A class of discontinuous PetrovGalerkin methods. Part III: Adaptivity
(with L. Demkowicz and A. Niemi) Applied Numerical Mathematics, Volume 62, pp. 396427, 2012. [Preprint]

A second elasticity element using the matrix bubble
(with J. Guzmán). IMA Journal of Numerical Analysis, Volume 32, pp. 352372, 2012. [Preprint]

Commuting smoothed projectors in weighted norms with an
application to axisymmetric Maxwell equations
(with M. Oh). Journal of Scientific Computation, Volume 51, pp. 394420, 2012. [Preprint]

Symmetric nonconforming mixed finite elements for linear elasticity
(with J. Guzmán). SIAM Journal on Numerical Analysis, Volume 49, pp. 15041520, 2011. [Preprint]

Analysis of HDG methods for Stokes flow
(with B. Cockburn, N.C Nguyen, J. Peraire, and F.J. Sayas). Mathematics of Computation, Volume 80, pp. 723760, 2011. [Preprint]

A class of discontinuous PetrovGalerkin methods.
Part IV: The optimal test norm and timeharmonic wave propagation in 1D
(with V. Calo, L. Demkowicz, I. Muga, D. Pardo, and J. Zitelli) Journal of Computational Physics, Volume 230, pp. 24062432, 2011. [Preprint]

A class of discontinuous
PetrovGalerkin methods. Part II: Optimal test functions
(with L. Demkowicz). Numerical Methods for Partial Differential Equations, Volume 27, Issue 1, pp. 70105, January 2011. [Preprint]

Hybridization and postprocessing techniques for mixed eigenfunctions
(with B. Cockburn, F. Li, N.C. Nguyen and J. Peraire). SIAM Journal on Numerical Analysis, Volume 48, pp. 857881, 2010. [Preprint]

Multigrid in a weighted space arising from axisymmetric electromagnetics
(with D. Copeland and M. Oh). Mathematics of Computation, Volume 79, pp. 20332058, 2010. [Preprint]

A projectionbased error analysis of HDG methods
(with B. Cockburn and F.J. Sayas). Mathematics of Computation, Volume 79, pp.13511367, 2010. [Preprint]

A class of discontinuous PetrovGalerkin methods. Part I: The transport equation
(with L. Demkowicz). Computer Methods in Applied Mechanics and Engineering, Volume 199, pp. 15581572, 2010. [Preprint]

A new elasticity element made for enforcing weak stress symmetry
(with B. Cockburn and J. Guzmán). Mathematics of Computation, Volume 79, pp.13311349, 2010. [Preprint]

Polynomial extension operators. Part II
(with L. Demkowicz and J. Schöberl). SIAM Journal on Numerical Analysis, Volume 47, No. 5, pp. 32933324, 2009 [Preprint]

The derivation of hybridizable discontinuous Galerkin
methods for Stokes flow
(with B. Cockburn). SIAM Journal on Numerical Analysis, Volume 47, pp. 10921125, 2009. [Preprint]

A convergent multigrid cycle for the hybridized mixed method
(with S. Tan). Numerical Linear Algebra with Applications, Volume 16, Issue 9, pp. 689714, 2009. [Preprint]

Unified hybridization of discontinuous Galerkin, mixed, and continuous Galerkin methods for second order elliptic problems
(with B. Cockburn and R. Lazarov). SIAM Journal on Numerical Analysis, Volume 47, pp. 13191365, 2009. [Preprint]

Multigrid convergence for second order elliptic problems with smooth complex coefficients
(with J. E. Pasciak). Computer Methods in Applied Mechanics and Engineering, Volume 127, pp. 44114418, 2008. [Preprint]

Polynomial extension operators. Part I
(with L. Demkowicz and J. Schöberl). SIAM Journal on Numerical Analysis, Volume 46, Issue 6, pp. 30063031, 2008. [Preprint]

Asymptotic and
numerical techniques for resonances of thin photonic
structures
(with S. Moskow and F. Santosa). SIAM Journal on Applied Mathematics, Volume 69, Issue 1, pp. 3763, 2008. [Preprint]
 A mixed method
for axisymmetric divcurl systems
(with D. Copeland and J. E. Pasciak). Mathematics of Computation, Volume 77, pp. 19411965, 2008. [Preprint]

Locally conservative fluxes for the continuous Galerkin method
(with B. Cockburn and H. Wang). SIAM Journal on Numerical Analysis, Volume 45, Issue 4, pp. 17421776, 2007. [Preprint]

The convergence of Vcycle multigrid
algorithms for axisymmetric Laplace and Maxwell equations
(with J. E. Pasciak). Mathematics of Computation, Volume 75, pp. 16971719, 2006. [Preprint]

New hybridization techniques
(with B. Cockburn). A review of old and new hybridization techniques. GAMMMitteilungen, Volume 28, Number 2, pp. 154182, 2005. [Preprint]

Integration of hpadaptivity and a two grid solver for electromagnetic problems
(with L. Demkowicz and D. Pardo). Computer Methods in Applied Mechanics and Engineering, Volume 195, pp 25332573, 2006. [Preprint]

Incompressible finite elements via hybridization: Part II
(with B. Cockburn). SIAM Journal on Numerical Analysis, Volume 43, Number 4, pp. 16511672, 2005. [Preprint]

Incompressible finite elements via hybridization: Part I
(with B. Cockburn). SIAM Journal on Numerical Analysis, Volume 43, Number 4, pp. 16271650, 2005. [Preprint]

Nédélec spaces in affine coordinates
(with L. F. Demkowicz and L. E. GarcíaCastillo). Computers and Mathematics with Applications, Volume 49, Issue 78, pp. 12851294, 2005. [Preprint]

Error analysis of variable degree mixed methods for
elliptic problems via hybridization
(with B. Cockburn). Mathematics of Computation, Volume 74, pp. 16531677, 2005. [Preprint] 
Quasioptimality of some spectral mixed methods
(with L. F. Demkowicz). Journal of Computational and Applied Mathematics, Volume 167, Issue 1, pp. 163182, 2004. [Preprint] 
A characterization of hybridized mixed methods
for second order elliptic problems
(with B. Cockburn). SIAM Journal on Numerical Analysis, Volume 42, No. 1, pp. 283301, 2004. [Preprint] 
Analysis of a multigrid algorithm for time harmonic Maxwell equations
(with L. F. Demkowicz and J. E. Pasciak). SIAM Journal on Numerical Analysis, Volume 42, No. 1, pp. 90108, 2004. [Preprint] 
A Schwarz preconditioner for a hybridized mixed method
Computational Methods in Applied Mathematics, Volume 3, No. 1, pp. 116134, 2003. [Preprint] 
Application of unified DG analysis to preconditioning DG
methods
(with G. Kanschat). Proc. 2nd MIT Conference on Computational Fluid and Solid Mechanics, pp.19431945, 2003. [Preprint] 
A multilevel discontinuous Galerkin method
(with G. Kanschat). Numerische Mathematik, Volume 95, No. 3, pp. 527550, 2003. [Preprint] 
A mathematical model for irrigated epicardial radiofrequency ablation
Annals of Biomedical Engineering, Volume 30, Issue 7, pp. 884893, 2002. [Preprint] 
Overlapping Schwarz preconditioners for indefinite time
harmonic Maxwell equations
(with J. E. Pasciak). Mathematics of Computation, Volume 72, No. 241, pp. 115, 2003. [Preprint] 
An efficient method for band structure calculations in 3D photonic
crystals
(with D. C. Dobson and J. E. Pasciak). Journal of Computational Physics, Volume 161, No. 2, pp. 668679, Jul 2000. [Preprint] 
Mortar estimates independent of number of
subdomains.
EastWest Journal of Numerical Mathematics, Volume 8, No. 2, pp. 83152, 2000. [Preprint] 
Multigrid for the mortar finite element method
(with J. E. Pasciak). SIAM Journal on Numerical Analysis, Volume 37, No. 3, pp. 10291052, March 2000. [Preprint]