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Modal based hypocoercivity methods on the torus and the real line with application to Goldstein-Taylor models
Virtualconference
Authors : Arnold, Anton (Author of the conference)
CIRM (Publisher )
35B40 - Asymptotic behavior of solutions of PDE
35S05 - General theory of $\Psi$DO
82C40 - Kinetic theory of gases
35Q82 - PDEs in connection with statistical mechanics
Additional resources :
https://www.cirm-math.fr/RepOrga/2355/Slides/slide_Anton_ARNOLD.pdf
CIRM (Publisher )
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Abstract :
We are concerned with deriving sharp exponential decay estimates (i.e. with maximum rate and minimum multiplicative constant) for linear, hypocoercive evolution equations. Using a modal decomposition of the model allows to assemble a Lyapunov functional using Lyapunov matrix inequalities for each Fourier mode.
We shall illustrate the approach on the 1D Goldstein-Taylor model, a2-velocity transport-relaxation equation. On the torus the lowest Fourier modes determine the spectral gap of the whole equation in $L^{2}$. By contrast, on the whole real line the Goldstein-Taylor model does not have a spectral gap, since the decay rate of the Fourier modes approaches zero in the small mode limit. Hence, the decay is reduced to algebraic.
In the final part of the talk we consider the Goldstein-Taylor model with non-constant relaxation rate, which is hence not amenable to a modal decomposition. In this case we construct a Lyapunov functional of pseudodifferential nature, one that is motivated by the modal analysis in the constant case.The robustness of this approach is illustrated on a multi-velocity GoldsteinTaylor model, yielding explicit rates of convergence to the equilibrium.
This is joint work with J. Dolbeault, A. Einav, C. Schmeiser, B. Signorello, and T. Wöhrer.
Keywords : BGK equation; hypocoercivity; large time behaviour; exponential decay; Lyapunov functional
MSC Codes : We shall illustrate the approach on the 1D Goldstein-Taylor model, a2-velocity transport-relaxation equation. On the torus the lowest Fourier modes determine the spectral gap of the whole equation in $L^{2}$. By contrast, on the whole real line the Goldstein-Taylor model does not have a spectral gap, since the decay rate of the Fourier modes approaches zero in the small mode limit. Hence, the decay is reduced to algebraic.
In the final part of the talk we consider the Goldstein-Taylor model with non-constant relaxation rate, which is hence not amenable to a modal decomposition. In this case we construct a Lyapunov functional of pseudodifferential nature, one that is motivated by the modal analysis in the constant case.The robustness of this approach is illustrated on a multi-velocity GoldsteinTaylor model, yielding explicit rates of convergence to the equilibrium.
This is joint work with J. Dolbeault, A. Einav, C. Schmeiser, B. Signorello, and T. Wöhrer.
Keywords : BGK equation; hypocoercivity; large time behaviour; exponential decay; Lyapunov functional
35B40 - Asymptotic behavior of solutions of PDE
35S05 - General theory of $\Psi$DO
82C40 - Kinetic theory of gases
35Q82 - PDEs in connection with statistical mechanics
Additional resources :
https://www.cirm-math.fr/RepOrga/2355/Slides/slide_Anton_ARNOLD.pdf
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Information on the Video
Film maker : Hennenfent, GuillaumeLanguage : English Available date : 09/04/2021 Conference Date : 22/03/2021 Subseries : Research talks arXiv category : Analysis of PDEs Mathematical Area(s) : Analysis and its Applications ; PDE Format : MP4 (.mp4) - HD Video Time : 00:40:31 Targeted Audience : Researchers Download : https://videos.cirm-math.fr/2021-03-22_Arnold.mp4 
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Information on the Event
Event Title : Jean Morlet Chair 2021- Conference: Kinetic Equations: From Modeling Computation to Analysis / Chaire Jean-Morlet 2021 - Conférence : Equations cinétiques : Modélisation, Simulation et AnalyseEvent Organizers : Bostan, Mihaï ; Jin, Shi ; Mehrenberger, Michel ; Montibeller, Celine Dates : 22/03/2021 - 26/03/2021 Event Year : 2021 Event URL : https://www.chairejeanmorlet.com/2355.html
Citation Data
DOI : 10.24350/CIRM.V.19733203Cite this video as: Arnold, Anton (2021). Modal based hypocoercivity methods on the torus and the real line with application to Goldstein-Taylor models. CIRM. Audiovisual resource. doi:10.24350/CIRM.V.19733203 URI : http://dx.doi.org/10.24350/CIRM.V.19733203 |
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Bibliography
- ARNOLD, Anton, EINAV, Amit, SIGNORELLO, Beatrice, et al. Large time convergence of the non-homogeneous Goldstein-Taylor Equation. Journal of Statistical Physics, 2021, vol. 182, no 2, p. 1-35. - https://doi.org/10.1007/s10955-021-02702-8
- ARNOLD, Anton, DOLBEAULT, Jean, SCHMEISER, Christian, et al. Sharpening of decay rates in Fourier based hypocoercivity methods. arXiv preprint arXiv:2012.09103, 2020. - https://arxiv.org/abs/2012.09103
