Professur Analysis
Forschung / Research
Professur Analysis 

Forschung / Research

(Co-)Organized conferences:

  • Variable Curvature Bounds, Analysis and Topology on Dirichlet Spaces (organized with Gilles Carron, Matthias Keller, Kazuhiro Kuwae). Oberwolfach Mini-Workshop, December 5 -11, 2021
  • Stability Phenomena In Geometry and Mathematical Physics. (organized together with Olaf Müller) At the Humboldt-University, Berlin, October 9 - 12, 2018
  • Recent Progress in Path Integration on Graphs and Manifolds (organized together with Matthias Keller, Kazumasa Kuwada, Anton Thalmaier) Oberwolfach Mini-Workshop, April 7 – 13, 2019
  • Einstein Equations: Physical and Mathematical Aspects of General Relativity In Domodossola, Italy, July 16 - 20, 2018

Selected talks:

Book:

Covariant Schrödinger semigroups on noncompact Riemannian manifolds. Published as a monograph in the Birkhäuser series 'Operator theory: advances and applications'. The book can be obtained here.

Book chapter:

Geometric Analysis on Singular Spaces (w. Francesco Bei, Jochen Brüning, Matthias Ludewig; 68 pages). Appeared as a chapter in the book 'Space - Time - Matter: Analytic and Geometric Structures (SFB 647)', De Gruyter Verlag. The book can be obtained here.

Editorial activities:

  • Oberwolfach Report: Variable Curvature Bounds, Analysis and Topology on Dirichlet Spaces. Gilles Carron, Nantes; Batu Güneysu, Chemnitz; Matthias Keller, Potsdam; Kazuhiro Kuwae, Fukuoka (Org.). The introduction and the extended abstracts can be obtained here.
  • Oberwolfach Report: Recent Progress in Path Integration on Graphs and Manifolds. Batu Güneysu, Matthias Keller, Kazumasa Kuwada, Anton Thalmaier (Org.). The introduction and the extended abstracts can be obtained here.
  • Einstein Equations: Physical and Mathematical Aspects of General Relativity. Sergio Cacciatori, Batu Güneysu, Stefano Pigola (Eds.). Published as proceedings to the summerschool 'Domoschool 2018' in the Birkhäuser series 'Tutorials, Schools, and Workshops in the Mathematical Sciences'. The book can be obtained here.

Preprints:

  • Neumann cut-offs and essential self-adjointness on complete Riemannian manifolds with boundary (with Davide Bianchi and Alberto Setti). Arxiv.
  • Fermionic Dyson expansions and stochastic Duistermaat-Heckman localization on loop spaces (with Jonas Miehe). Arxiv.
  • Heat kernel estimates and the relative compactness of perturbations by potentials (with Jochen Brüning). Arxiv.

Papers published or accepted in peer-reviewed journals:

  • A note on the scattering theory of Kato-Ricci manifolds (with Maxime Marot). To appear in Rocky Mountain Journal of Mathematics.

  • Asymptotic Equivalence of Identification Operators in Geometric Scattering Theory. To appear in Documenta Mathematica.

  • Locally convex aspects of the Kato and the Dynkin class on manifolds (with Kazuhiro Kuwae). To appear in the Illinois Journal of Mathematics.

  • A new notion of subharmonicity on locally smoothing spaces, and a conjecture by Braverman, Milatovic, Shubin (with Stefano Pigola, Peter Stollmann, and Giona Veronelli). Math. Ann.390 (2024), no.3, 4209–4243. Link to paper on journal homepage.

  • Essential spectrum and Feller type properties (with Ali BenAmor and Peter Stollmann). Integral Equations Operator Theory 95 (2023), no. 2, Paper No. 12, 20 pp. Link to paper on journal homepage.

  • Estimates for the covariant derivative of the heat semigroup on differential forms, and covariant Riesz transforms (with Robert Baumgarth and Baptiste Devyver). Math. Ann. 386 (2023), no. 3-4, 1753–1798. Link to paper on journal homepage.

  • A Chern-Simons transgression formula for supersymmetric path integrals on spin manifolds (with Sebastian Boldt and Sergio Cacciatori). J. Geom. Phys.195 (2024), Paper No. 105041, 12 pp. Link to paper on journal homepage.
  • Scattering Theory and Spectral Stability under a Ricci Flow for Dirac Operators (with Sebastian Boldt). Preprint version. To appear in Annales de la Faculté des Sciences de Toulouse.
  • Feynman-Kac formula for perturbations of order $\leq 1$, and noncommutative geometry (with Sebastian Boldt). Stoch. Part. Differ. Equ. Anal. Comput. 11 (2023), no.4, 1519–1552. Link to paper on journal homepage
  • The Chern character of theta-summable Fredholm modules over dg algebras and localization on loop space (with Matthias Ludewig).  Adv. Math. 395 (2022), Paper No. 108143, 52 pp. Link to paper on journal homepage.
  • Heat flow regularity, Bismut--Elworthy--Li's derivative formula, and pathwise couplings on Riemannian manifolds with Kato bounded Ricci curvature (with Mathias Braun). Electron. J. Probab. 26 (2021), Paper No. 129, 25 pp. Link to paper on journal homepage.
  • Hölder estimates for magnetic Schrödinger semigroups from mirror coupling (with Oliver Fürst). Letters in Mathathematical Physics 111 (2021), no. 1, Paper No. 21, 18 pp. Link to paper on journal homepage.

  • RCD*(K,N) spaces and the geometry of multi-particle Schrödinger semigroups. Int. Math. Res. Not. IMRN (2022), no.4, 3144–3169. Link to paper on journal homepage.

  • Molecules as metric measure spaces with Kato-bounded Ricci curvature (with Max von Renesse). C. R. Math. Acad. Sci. Paris 358 (2020), no. 5, 595–602. Link to paper on journal homepage.

  • On the geometry of semiclassical limits on Dirichlet spaces. Journal of Functional Analysis 279 (2020), no. 6, 108638. Link to paper on journal homepage.
  • Kac regular sets and Sobolev spaces in geometry, probability and quantum mechanics (with Francesco Bei).  Mathematische Annalen 379 (2021), no. 3-4, 1623-1650. Link to paper on journal homepage.

  • Odd characteristic classes in entire cyclic homology and equivariant loop space homology (with Sergio Cacciatori). J. Noncommut. Geom. 15 (2021), no. 2, 615–642. Link to paper on journal homepage.

  • Scattering theory without injectivity radius assumptions and spectral stability for the Ricci flow (with Anton Thalmaier). Ann. Inst. Fourier (Grenoble) 70 (2020), no. 1, 437–456. 35 (58) Link to paper on journal homepage.

  • On the semimartingale property of Brownian bridges on complete manifolds. ALEA Lat. Am. J. Probab. Math. Stat. 16 (2019), no. 1, 15–31. Link to paper on journal homepage.

  • Feynman path integrals for magnetic Schrödinger operators on infinite weighted graphs (with Matthias Keller). Journal d'Analyse Mathematique 141 (2020), no. 2, 751–770. Link to paper on journal homepage

  • Scattering the geometry of weighted graphs (with Matthias Keller). Mathematical Physics, Analysis and Geometry volume 21, Article number: 28 (2018). Link to paper on journal homepage.

  • L^p interpolation inequalities and global Sobolev regularity results (with Stefano Pigola and an appendix by Ognjen Milatovic). Annali di Matematica Pura ed Applicata (1923 -) Volume 198 (2019), Issue 1, pp 83–96. Link to paper on journal homepage.
  • Nonlinear Calderon-Zygmund inequalities for maps (with Stefano Pigola). Ann. Global Anal. Geom. 54 (2018), Issue 3, pp 353–364. Link to paper on journal homepage.
  • Quantitative C^1 estimates on manifolds (with Stefano Pigola). To appear in International Mathematics Research Notices 2018, no. 13, 4103–4119. Link to paper on journal homepage.
  • Heat kernels in the context of Kato potentials on arbitrary manifolds. Potential Anal. 46 (2017), no. 1, 119--134. Link to paper on journal homepage.
  • q-Parabolicity of stratified pseudomanifolds and other singular spaces (with Francesco Bei). Ann. Global Anal. Geom. 51 (2017), no. 3, 267--286. Link to paper on journal homepage.
  • Scattering theory of the Hodge Laplacian under a conformal perturbation (with Francesco Bei and Joern Mueller). J. Spectr. Theory 7 (2017), no. 1, 235--267. Link to paper on journal homepage.
  • The BMS-conjecture. Ulmer Seminare (2017). Link to paper on journal homepage.
  • On Some Generalisations of Meyers-Serrin Theorem} (with Davide Guidetti and Diego Pallara). Bruno Pini Mathematical Analysis Seminar (2015). doi: 10.6092/issn.2240-2829/5894. Link to paper on journal homepage.
  • The Calder\'on-Zygmund inequality and Sobolev spaces on noncompact Riemannian manifolds (with Stefano Pigola). Adv. Math. 281 (2015), 353–393. Link to paper on journal homepage.
  • L^1-elliptic regularity and H=W on the whole L^p-scale on arbitrary manifolds (with Davide Guidetti and Diego Pallara). Ann. Acad. Sci. Fenn. Math. 42 (2017), no. 1, 497–521. Link to paper on journal homepage.
  • Stochastic differential equations for models of nonrelativistic matter interacting with quantized radiation fields (with Oliver Matte and Jacob Schach-Møller). To appear in Probability Theory and Related Fields, pp. 1--99, DOI 10.1007/s00440-016-0694-4. Link to paper on journal homepage.
  • Semiclassical limits of quantum partition functions on infinite graphs. J. Math. Phys. 56 (2015), no. 2, 022102, 13 pp. Link to paper on journal homepage.
  • Sequences of uniform Laplacian cut-off functions. J. Geom. Anal. 26 (2016), no. 1, 171–184. Link to paper on journal homepage.
  • The profinite dimensional manifold structure of formal solution spaces of formally integrable PDE's (with Markus Pflaum). SIGMA 13 (2017), 003, 44 pages Link to paper on journal homepage.
  • Generalized Schrödinger semigroups on infinite graphs (with Ognjen Milatovic and Francoise Truc). Potential Anal. 41 (2014), no. 2, 517–541. Link to paper on journal homepage.
  • A Feynman-Kac-Ito Formula for magnetic Schrödinger operators on graphs (with Matthias Keller and Marcel Schmidt). To appear in Probability Theory and Related Fields, pp. 1--35, DOI 10.1007/s00440-015-0633-9. Link to paper on journal homepage.
  • Functions with bounded variation on a class of Riemannian manifolds with Ricci curvature unbounded from below (with Diego Pallara). Math. Ann. 363 (2015), no. 3-4, 1307–1331. Link to paper on journal homepage.
  • Path integrals and the essential self-adjointness of differential operators on noncompact manifolds (with Olaf Post). Math.Z. 275 (2013), Issue 1-2, pp 331--348. Link to paper on journal homepage.
  • Nonrelativistic Hydrogen type stability problems on nonparabolic 3-manifolds. Annales Henri Poincaré 13 (2012), 1557--1573. Link to paper on journal homepage.
  • On generalized Schrödinger semigroups. J. Funct. Anal. 262 (2012), 4639--4674. Link to paper on journal homepage.
  • Kato's inequality and form boundedness of Kato potentials on arbitrary Riemannian manifolds . Prof. Am. Math. Soc. 142, No. 4, 1289-1300 (2014). Link to paper on journal homepage.
  • Multiplicative matrix-valued functionals and continuity properties of semigroups corresponding to differential operators with matrix coefficients. J. Math. Anal. Appl. 380 (2011), 709--725. Link to paper on journal homepage.
  • The Feynman-Kac formula for Schrödinger operators on vector bundles over complete manifolds. J. Geom. Phys 60 (2010), 1997--2010. Link to paper on journal homepage.
  • The representation of strongly continuous operator semigroups on vector bundles as Hida distributions. Infin. Dimens. Anal. Quantum Probab. Relat. Top. 12 (2009), no. 3, 511--519.Link to paper on journal homepage.

Papers published in peer-reviewed conference proceedings:

  • Stochastic calculus and nonrelativistic quantum electrodynamics (with Oliver Matte and Jacob Schach-Møller). To appear in the Conference Proceedings of QMATH 12 Preprint version.
  • Recent probabilistic results on covariant Schrödinger operators on infinite weighted graphs (with Ognjen Milatovic). To appear in the Conference Proceedings of QMATH 12 Preprint version

Theses:

  • Covariant Schrödinger semigroups on noncompact Riemannian manifolds (Habilitationsschrift). Humboldt-Universität zu Berlin. An extended version of this thesis has appeared as a book in Birkhäuser.
  • On the Feynman-Kac formula for Schrödinger semigroups on vector bundles (Dissertation). Bonn. This is a slightly revised version of my PhD thesis (under the supervision of Prof. Dr. Matthias Lesch). It includes an introduction to stochastic analysis (on manifolds). File
  • Ein Kriterium für die Absolutstetigkeit des Spektrums von Sturm-Liouville-Operatoren (Diplomarbeit). Frankfurt am Main. Under the supervision of Prof. Dr. Joachim Weidmann.