Tobias Barker

I am interested in Partial Differential Equations, with a current emphasis on those that relate to the motion of fluids. 

Career:  September 2021-: Lecturer in Analysis (Assistant Professor), Department of Mathematical Sciences, University of Bath. 

2020-August 2021: Leverhulme Early Career Research Fellow, University of Warwick (mentor: Professor José Rodrigo).  Early Career Fellowship  funded by The Leverhulme Trust .

 2018- June 2020: Postdoctoral researcher, Département de Mathématiques et Applications  (DMA),  École Normale Superieure (mentor: Professor Isabelle Gallagher). Funded by  Fondation Sciences Mathématiques de Paris.

January 2018-July 2018: EPSRC Doctoral Prize, University of Oxford (Advisor: Professor Gregory Seregin).

Education: Doctor of Philosophy in Mathematics, 2013- August 2017, University of Oxford (Advisor: Professor Gregory Seregin).

Preprints and Publications

• On symmetry breaking for the Navier-Stokes equations (with Christophe Prange and Jin Tan).Commun. Math. Phys. 405, 25 (2024). Journal, arXiv. 

• Blow-up of dynamically restricted critical norms near a potential Navier-Stokes singularity (with Pedro Gabriel Fernández Dalgo and Christophe Prange). Math. Ann. (2023). Journal, arXiv. 

• From concentration to quantitative regularity: a short survey of recent developments for the Navier-Stokes equations (with Christophe Prange). Vietnam J. Math. (2023). Journal, arXiv. 

• Epsilon regularity for the Navier-Stokes equations via weak-strong uniqueness (with Dallas Albritton and Christophe Prange). J.Math. Fluid Mech. 25, 49 (2023). Journal, arXiv. 

• Localized quantitative estimates and potential blow-up rates for the Navier-Stokes equations. Siam Journal on Mathematical Analysis 55, no. 5 (2023): 5221-5259. Journal, arXiv. 

• Estimates of the singular set for the Navier-Stokes equations with supercritical assumptions on the pressure (with Wendong Wang). Journal of Differential Equations, 365 (2023),  379-407. Journal, arXiv.  

• Higher integrability and the number of singular points for the Navier-Stokes equations with a scale-invariant bound. Preprint (November 2021). arXiv. To appear in Proceedings of the American Mathematical Society.

• Localized smoothing and concentration for the Navier-Stokes equations in the half space (with Dallas Albritton and Christophe Prange). Journal of Functional Analysis 284, no. 1 (2023): 109729. Journal, arXiv.  

• Mild criticality breaking for the Navier-Stokes equations (with Christophe Prange). J. Math. Fluid Mech. 23:66. (2021). Journal, arXiv

• Quantitative regularity for the Navier-Stokes equations via spatial concentration   (with Christophe Prange). Commun. Math. Phys. 385, 717–792 (2021).  Journal, arXiv 

•   About local continuity with respect to L2 initial data for energy solutions of the Navier–Stokes equations. Mathematische Annalen (2020). Journal, arXiv

• Localised necessary conditions for singularity formation in the Navier-Stokes equations with curved boundary (with Dallas Albritton). Journal of Differential Equations. Volume 269, Issue 9, 15 October 2020, Pages 7529-7573.   https://doi.org/10.1016/j.jde.2020.06.009,arXiv                                                                                                                                                                                          

•    Scale-Invariant Estimates and Vorticity Alignment for Navier–Stokes in the Half-Space with No-Slip Boundary Conditions (with Christophe Prange). Arch. Ration. Mech. Anal., 235(2), 881-926 (2020). Journal, arXiv 

•     Localized Smoothing for the Navier–Stokes Equations and Concentration of Critical Norms Near Singularities (with Christophe Prange). Arch. Ration. Mech. Anal., 236, 1487-1541 (2020). Journal, arXiv 

•    On Local Type I Singularities of the Navier–Stokes Equations and Liouville Theorems (with Dallas Albritton).          J. Math. Fluid Mech. 21:43. (2019)  Journal,  arXiv 

•     Global Weak Besov Solutions of the Navier–Stokes Equations and Applications (with Dallas Albritton). Arch. Ration. Mech. Anal., 232(1):197–263 (2019). Journal, arXiv  

•    On stability of weak Navier–Stokes solutions with large L3,∞ initial data (with Gregory Seregin and Vladimír Šverák ). Comm. PDE, 43:4, 628-651  (2018). Journal 

•     Uniqueness Results for Weak Leray–Hopf Solutions of the Navier–Stokes System with Initial Values in Critical Spaces. J. Math. Fluid Mech. 20, 133-160 (2018). Journal, arXiv 

•  A necessary condition of potential blowup for the Navier–Stokes system in half-space (with Gregory Seregin). Mathematische Annalen. 369, 1327-1352 (2017). Journal, arXiv 

•   Local Boundary Regularity for the Navier–Stokes Equations in Non-Endpoint Borderline Lorentz Spaces. J. Math.Sci. 224, 391-413 (2017). Journal, arXiv 

•    Ancient Solutions to Navier–Stokes Equations in Half Space (with Gregory Seregin). J. Math. Fluid Mech. 17, 551-575 (2015). Journal, arXiv