Project data:

Sonata 17 grant 2021/43/D/ST1/00667.
Financed by the National Science Centre, Poland.
03-10-2022 to 02-10-2025.
970,740 PLN.
 

Project goal:

The project concerns the construction and use of new function spaces to study local smoothing for wave equations. This builds upon work which connects local smoothing estimates for the Euclidean wave equation, as well as the lp decoupling inequality for the light cone, to the Hardy spaces for Fourier integral operators.
For a more accessible (albeit imprecise) description, see here (i po polsku).
 

Project team:

1. Jan Rozendaal. Principal Investigator.

2. Abhishek Ghosh. Postdoctoral Fellow.

Research output:

1. The Hardy spaces HpFIO(Rn) for Fourier integral operators for p<1. 2025, 31 pages. Available here. With Naijia Liu and Liang Song.

2. H1 and bmo regularity for wave equations with rough coefficients. 2025, 43 pages. Available here. By N. Liu, J. Rozendaal and L. Song.

3. Improved polynomial decay for unbounded semigroups. J. Evol. Equ. 24, (2024), no. 4, Paper No. 99, 18 pp. By C. Deng, J. Rozendaal and Mark Veraar.

4. Local smoothing and Hardy spaces for Fourier integral operators on manifolds. J. Funct. Anal. 286 (2024), no. 2, Paper No. 110221, 72 pp. By N. Liu, J. Rozendaal, L. Song and L. Yan.

5. Decay at infinity for solutions to some fractional parabolic equations. Proc. Roy. Soc. Edinburgh Sect. A (2024), 1-37. Published online. By A. Ghosh and A. Banerjee. 

6. Spherical maximal functions and Hardy spaces for Fourier integral operators. 2024, 32 pages. Available here. By A. Ghosh, N. Liu, J. Rozendaal and L. Song.

7. Function spaces for decoupling. 2023, 50 pages. Available here. By A. Hassell, P. Portal, J. Rozendaal and P.-L. Yung.

Presentations:

• Harmonic Analysis and Orthogonal Expansions, seminar. University of Wrocław, Poland. April 2025. By J. Rozendaal. 

• Functional Analysis Seminar. IMPAN. March 2025. By J. Rozendaal.

• IMPAN colloquium. IMPAN. February 2025. By J. Rozendaal.

• Harmonic Analysis e-seminars. Video presentation. October 2024. By J. Rozendaal.   

• US-Poland-Ukraine workshop on wave equations and related matters. IMPAN. September 2024. By J. Rozendaal.

• Contemporary Harmonic Analysis and its Synergies, conference. IMPAN. September 2024. By J. Rozendaal. 

• TULKKA, biannual meeting of the analysis departments in Tübingen, Ulm, Konstanz and Karlsruhe. Karlsruhe Institute of Technology, Karlsruhe, Germany. July 2024. By J. Rozendaal. 

• Harmonic Analysis and Orthogonal Expansions, seminar. University of Wrocław, Poland. May 2024. By J. Rozendaal. 

• Analysis Seminar. Delft University of Technology, Netherlands. April 2024. By J. Rozendaal. 

• Geometric Function and Mapping Theory, seminar. IMPAN. April 2024. By A. Ghosh.

• Harmonic Analysis on Manifolds, conference. Loughborough, United Kingdom. April 2024. By J. Rozendaal.

• Dynamics and Thermodynamics of Large Interacting Systems, conference. IMPAN, March 2024. By J. Rozendaal.

• Harmonic Analysis and Orthogonal Expansions, seminar. University of Wrocław, Poland. March 2024. By A. Ghosh. 

• US-Poland-Ukraine seminar on wave equations and related matters. Video presentation. February 2024. By J. Rozendaal.

• Leibniz University Hannover, Germany. November 2023. By J. Rozendaal.

• Geometric Function and Mapping Theory seminar. IMPAN. November 2023. By J. Rozendaal.

• Sun Yat-Sen University, China. October 2023. By J. Rozendaal.

• Kiel University, Germany. April 2023. By J. Rozendaal.

• AustMS Annual Meeting 2022, conference. Sydney, Australia. December 2022. By J. Rozendaal.

• Analysis and PDE seminar. Australian National University, Australia. November 2022. By J. Rozendaal.

• Analysis seminar. Monash University, Australia. November 2022. By J. Rozendaal.

• Analysis seminar. Macquarie University, Australia. November 2022. By J. Rozendaal.

Travels:

• University of Wrocław, Poland. 1-2 April 2025. By J. Rozendaal.

• Karlsruhe Institute of Technology, Karlsruhe, Germany. 21-25 July 2024. By J. Rozendaal.

• Harmonic analysis and partial differential equations, conference. Centre international de rencontres mathématiques (CIRM), Marseille, France. 10-14 June 2024. By A. Ghosh.

• University of Wrocław, Poland. 20-24 May 2024. By J. Rozendaal.

• Delft University of Technology. Netherlands. April 2024. By J. Rozendaal.

• Harmonic Analysis on Manifolds, conference. Loughborough, United Kingdom. 2-5 April 2024. By J. Rozendaal.

• University of Wrocław, Poland. 5-7 March 2024. By A. Ghosh. 

• Leibniz University Hannover, Germany. 19-22 November 2023. By J. Rozendaal.

• Sun Yat-Sen University, China. 4-17 October 2023. By J. Rozendaal.

• Kiel University, Germany. 17-21 April 2023. By J. Rozendaal.

• AustMS Annual Meeting 2022, conference. Sydney, Australia. 6-9 December 2022. By J. Rozendaal. 

• Australian National University, Australia. 13 November to 4 December 2022. By J. Rozendaal.

• Sydney, Canberra and Melbourne, Australia. 28 October to 12 November 2022. By J. Rozendaal.