Moritz Egert

Tim Böhnlein (Ph.D. student)

Miriam Buck (Ph.D. student)

Benjamin Kosmala (Ph.D. student

Up-to-date versions of my publications can be found on HAL and arXiv. Inaccuracies that are pointed out to me after publication are usually corrected in these versions.

My profile on Google Scholar.

Research Papers and Preprints

• Meyers exponent rules the first-order approach to second-order elliptic boundary value problems(with P. Auscher and T. Böhnlein), 27 pages, submitted. arXiv
• A Note on Complex Interpolation of Quasi-Banach Function Spaces(with B.W. Kosmala), 13 pages, submitted. arXiv
• A stability result for parabolic measures of operators with singular drifts (with S. Bortz and O. Saari), 33 pages, submitted. arXiv
• Bounded functional calculus for divergence form operators with dynamical boundary conditions (with T. Böhnlein and J. Rehberg), 29 pages, submitted.arXiv
• The Kato square root problem for weighted parabolic operators (with A. Ataei and K. Nyström), Analysis&PDE 19 (2025). arXivOpen Access (opens in new tab)
• Gaussian estimates vs. elliptic regularity on open sets (with T. Böhnlein and S. Ciani), Math. Annalen 391 (2025), 2709--2756. arXivOpen Access
• Carleson vonditions for weights: the quantitative small constant case (with S. Bortz and O. Saari), Nonlinear Analysis 257 (2025). arXivOpen Access
• Sobolev contractivity of gradient flow maximal functions (with S. Bortz and O. Saari), Adv. Calc. Var. 17 (2024), no.4, 1487–1505.arXiv
• Explicit improvements for Lp-estimates related to elliptic systems (with Tim Böhnlein), Bull. Lond. Math. Soc. 56 (2023), no.3, 914-930. arXiv
• A universal framework for parabolic equations and systems (with P. Auscher), Calc. Var. Partial Differential Equations 62 Article number: 249 (2023) arXivOpen Access
• Hardy spaces for boundary value problems of elliptic systems with block structure (with P. Auscher), 17 pages, J. Geom. Anal. (2021).arXiv
• Note on time-regularity for weak solutions to parabolic systems of p-Laplace type (with S. Bortz), Proc. Amer. Math. Soc. 149 (2021), no.4, 1677-1685.arXiv
• The Kato square root problem on locally uniform domains (with S. Bechtel and R. Haller-Dintelmann) Adv. Math. 375 (2020).arXiv
• On p-elliptic divergence form operators and holomorphic semigroups, J. Evol. Equ. 20 (2020), no.3, 705-724.arXiv Talk in Bad Herrenalb (opens in new tab) (2019)
• Interpolation theory for Sobolev functions with partially vanishing trace on irregular open sets (with S. Bechtel), J. Fourier Anal. Appl. 25 (2019), no. 5, 2733-2781.arXiv
• Lp-estimates for the square root of elliptic systems with mixed boundary conditions, J. Differential Equations 265 (2018), no. 4, 1279-1323. arXiv
• Non-local self-improving properties: A functional analytic approach (with P. Auscher and S. Bortz and O. Saari), Tunisian J. Math. 1 (2019), no. 2, 151-183.arXiv
• Non-local Gehring lemmas in spaces of homogeneous type and applications (with P. Auscher and S. Bortz and O. Saari), J. Geom. Anal. 30 (2019), no.4, 3760-3805.arXiv
• On regularity of weak solutions to linear parabolic systems with measurble coefficients (with P. Auscher and S. Bortz and O. Saari), J. Math. Pures Appl. 121 (2019), 216-243.arXiv Colloquium Talk WIAS Berlin (opens in new tab) (2018)
• On uniqueness results for Dirichlet problems of elliptic systems without DeGiorgi- Nash-Moser regularity (with P. Auscher), Anal. PDE 13 (2020), no.6, 1605-1632.arXiv
• The Dirichlet problem for second order parabolic operators in divergence form (with P. Auscher and K. Nyström), J. Éc. polytech. Math. 5 (2018), 407–441. arXiv
• L2 well-posedness of boundary value problems for parabolic systems with measurable coefficients (with P. Auscher and K. Nyström), J. Eur. Math. Soc. (JEMS) 22 (2020), no.9, 2943-3058.arXiv Talk in Bedlewo (opens in new tab) (2017)
• Characterizations of Sobolev functions that vanish on a part of the boundary (with P. Tolksdorf), Discrete Contin. Dyn. Syst. Ser. S 10 (2017), no. 4, 729-743.arXiv
• On non-autonomous maximal regularity for elliptic operators in divergence form (with P. Auscher), Arch. Math. 107 (2016), no. 3, 271–284.arXiv Colloquium Talk WIAS Berlin (opens in new tab) (2018)
• Mixed boundary value problems on cylindrical domains (with P. Auscher), Adv. Differential Equ. 22 (2017), no.1/2, 101-168. arXiv Talk in Delft (opens in new tab) (2014)
• Hardy's inequality for functions vanishing on a part of the boundary (with Haller- Dintelmann and J. Rehberg), Potential Anal. 43 (2015), no.1, 49-78.arXiv
• The Kato Square Root Problem for Mixed Boundary Conditions (with R. Haller- Dintelmann and P. Tolksdorf), J. Funct. Anal. 267 (2014), no.5, 1419-1461.arXiv Talk in Herrnhut (opens in new tab) (2013)
• The Kato Square Root Problem follows from an Extrapolation Property of the Laplacian (with R. Haller-Dintelmann and P. Tolksdorf), Publ. Mat. 60 (2016), no. 2, 451-483.arXiv
• Convergence of subdiagonal Padé approximations to C0-semigroups (with J. Rozendaal), J. Evol. Equ. 13 (2013), no.4, 875-895.arXiv

Books/Thesis

• Boundary value problems and Hardy spaces for elliptic systems with block structure.(with P. Auscher), Birkhäuser/Springer, Cham, 2023. xiii+310 pp. arXiv Talk Lancaster (opens in new tab) (2021)
• On Kato's conjecture and mixed boundary conditions, PhD thesis, Sierke Verlag, Göttingen, 2015, ISBN: 978-3-86844-719-4. (A steadily updated and corrected version is available here (opens in new tab) .) Overview talk about my thesis (opens in new tab) .