Pub Date : 2025-11-01Epub Date: 2025-08-28DOI: 10.1016/j.matpur.2025.103781
Shuang Liu
The paper is concerned with the effects of the spatio-temporal heterogeneity on the principal eigenvalues of some linear time-periodic parabolic systems. Various asymptotic behaviors of the principal eigenvalue and its monotonicity, as a function of the diffusion rate and frequency, are derived. In particular, some singular behaviors of the principal eigenvalues are characterized when both the diffusion rate and frequency approach zero, with some scalar time-periodic Hamilton-Jacobi equation as the limiting equation. Furthermore, we completely classify the topological structures of the level sets for the principal eigenvalues in the plane of the diffusion rate and frequency. Our results not only generalize the findings in [28] for scalar periodic-parabolic operators, but also reveal more rich global information, for time-periodic parabolic systems, on the dependence of the principal eigenvalues upon the spatio-temporal heterogeneity.
{"title":"Asymptotic and global analysis of principal eigenvalues for linear time-periodic parabolic systems","authors":"Shuang Liu","doi":"10.1016/j.matpur.2025.103781","DOIUrl":"10.1016/j.matpur.2025.103781","url":null,"abstract":"<div><div>The paper is concerned with the effects of the spatio-temporal heterogeneity on the principal eigenvalues of some linear time-periodic parabolic systems. Various asymptotic behaviors of the principal eigenvalue and its monotonicity, as a function of the diffusion rate and frequency, are derived. In particular, some singular behaviors of the principal eigenvalues are characterized when both the diffusion rate and frequency approach zero, with some scalar time-periodic Hamilton-Jacobi equation as the limiting equation. Furthermore, we completely classify the topological structures of the level sets for the principal eigenvalues in the plane of the diffusion rate and frequency. Our results not only generalize the findings in <span><span>[28]</span></span> for scalar periodic-parabolic operators, but also reveal more rich global information, for time-periodic parabolic systems, on the dependence of the principal eigenvalues upon the spatio-temporal heterogeneity.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"203 ","pages":"Article 103781"},"PeriodicalIF":2.3,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144925037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-06-13DOI: 10.1016/j.matpur.2025.103759
Lei Zhang , Xiao-Qiang Zhao
In this paper, we study the propagation dynamics for a large class of time and space heterogeneous reaction-diffusion equations , where represents the shifting distance, and the nonlinearity is asymptotically of KPP type as and is negative as . Let be the spreading speed of the limiting equation . Under the assumption that the shifting speed admits a uniform mean c, we show that the solutions with compactly supported initial data go to zero eventually when , the leftward spreading speed is when , and the rightward spreading speed is c and when and , respectively. We also establish the existence, uniqueness and nonexistence of the forced traveling wave in terms of the sign of .
{"title":"Spreading properties and forced traveling waves of reaction-diffusion equations in a time-heterogeneous shifting environment","authors":"Lei Zhang , Xiao-Qiang Zhao","doi":"10.1016/j.matpur.2025.103759","DOIUrl":"10.1016/j.matpur.2025.103759","url":null,"abstract":"<div><div>In this paper, we study the propagation dynamics for a large class of time and space heterogeneous reaction-diffusion equations <span><math><msub><mrow><mi>u</mi></mrow><mrow><mi>t</mi></mrow></msub><mo>=</mo><msub><mrow><mi>u</mi></mrow><mrow><mi>x</mi><mi>x</mi></mrow></msub><mo>+</mo><mi>u</mi><mi>g</mi><mo>(</mo><mi>x</mi><mo>−</mo><mi>ω</mi><mo>(</mo><mi>t</mi><mo>)</mo><mo>,</mo><mi>t</mi><mo>,</mo><mi>u</mi><mo>)</mo></math></span>, where <span><math><mi>ω</mi><mo>(</mo><mi>t</mi><mo>)</mo></math></span> represents the shifting distance, and the nonlinearity <span><math><mi>u</mi><mi>g</mi><mo>(</mo><mi>ξ</mi><mo>,</mo><mi>t</mi><mo>,</mo><mi>u</mi><mo>)</mo></math></span> is asymptotically of KPP type as <span><math><mi>ξ</mi><mo>→</mo><mo>−</mo><mo>∞</mo></math></span> and is negative as <span><math><mi>ξ</mi><mo>→</mo><mo>+</mo><mo>∞</mo></math></span>. Let <span><math><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span> be the spreading speed of the limiting equation <span><math><msub><mrow><mi>u</mi></mrow><mrow><mi>t</mi></mrow></msub><mo>=</mo><msub><mrow><mi>u</mi></mrow><mrow><mi>x</mi><mi>x</mi></mrow></msub><mo>+</mo><mi>u</mi><mi>g</mi><mo>(</mo><mo>−</mo><mo>∞</mo><mo>,</mo><mi>t</mi><mo>,</mo><mi>u</mi><mo>)</mo></math></span>. Under the assumption that the shifting speed <span><math><msup><mrow><mi>ω</mi></mrow><mrow><mo>′</mo></mrow></msup><mo>(</mo><mi>t</mi><mo>)</mo></math></span> admits a uniform mean <em>c</em>, we show that the solutions with compactly supported initial data go to zero eventually when <span><math><mi>c</mi><mo>≤</mo><mo>−</mo><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span>, the leftward spreading speed is <span><math><mo>−</mo><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span> when <span><math><mi>c</mi><mo>></mo><mo>−</mo><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span>, and the rightward spreading speed is <em>c</em> and <span><math><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span> when <span><math><mi>c</mi><mo>∈</mo><mo>(</mo><mo>−</mo><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>,</mo><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>)</mo></math></span> and <span><math><mi>c</mi><mo>≥</mo><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span>, respectively. We also establish the existence, uniqueness and nonexistence of the forced traveling wave in terms of the sign of <span><math><mi>c</mi><mo>−</mo><msup><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span>.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"203 ","pages":"Article 103759"},"PeriodicalIF":2.1,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-07-21DOI: 10.1016/j.matpur.2025.103771
Alex Abreu , Antonio Nigro
The characters of Kazhdan–Lusztig elements of the Hecke algebra over (and in particular, the chromatic symmetric function of indifference graphs) are completely encoded in the (intersection) cohomology of Lusztig varieties. Considering the forgetful map to some partial flag variety, the decomposition theorem tells us that this cohomology splits as a sum of intersection cohomology groups with coefficients in some local systems of subvarieties of the partial flag variety. We prove that these local systems correspond to representations of subgroups of . An explicit characterization of such representations would provide a recursive formula for the computation of such characters/chromatic symmetric functions, which could settle Haiman's conjecture about the positivity of the monomial characters of Kazhdan–Lusztig elements and Stanley–Stembridge conjecture about e-positivity of chromatic symmetric function of indifference graphs. We also find a connection between the character of certain homology groups of subvarieties of the partial flag varieties and the Grojnowski–Haiman hybrid basis of the Hecke algebra.
{"title":"Parabolic Lusztig varieties and chromatic symmetric functions","authors":"Alex Abreu , Antonio Nigro","doi":"10.1016/j.matpur.2025.103771","DOIUrl":"10.1016/j.matpur.2025.103771","url":null,"abstract":"<div><div>The characters of Kazhdan–Lusztig elements of the Hecke algebra over <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span> (and in particular, the chromatic symmetric function of indifference graphs) are completely encoded in the (intersection) cohomology of Lusztig varieties. Considering the forgetful map to some partial flag variety, the decomposition theorem tells us that this cohomology splits as a sum of intersection cohomology groups with coefficients in some local systems of subvarieties of the partial flag variety. We prove that these local systems correspond to representations of subgroups of <span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span>. An explicit characterization of such representations would provide a recursive formula for the computation of such characters/chromatic symmetric functions, which could settle Haiman's conjecture about the positivity of the monomial characters of Kazhdan–Lusztig elements and Stanley–Stembridge conjecture about <em>e</em>-positivity of chromatic symmetric function of indifference graphs. We also find a connection between the character of certain homology groups of subvarieties of the partial flag varieties and the Grojnowski–Haiman hybrid basis of the Hecke algebra.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"203 ","pages":"Article 103771"},"PeriodicalIF":2.1,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-06-16DOI: 10.1016/j.matpur.2025.103753
Purba Das , Donghan Kim
We study the concept of (generalized) p-th variation of a real-valued continuous function along a general class of refining sequence of partitions. We show that the finiteness of the p-th variation of a given function is closely related to the finiteness of -norm of the coefficients along a Schauder basis, similar to the fact that Hölder coefficient of the function is connected to -norm of the Schauder coefficients. This result provides an isomorphism between the space of α-Hölder continuous functions with finite (generalized) p-th variation along a given partition sequence and a subclass of infinite-dimensional matrices equipped with an appropriate norm, in the spirit of Ciesielski.
{"title":"On isomorphism of the space of continuous functions with finite p-th variation along a partition sequence","authors":"Purba Das , Donghan Kim","doi":"10.1016/j.matpur.2025.103753","DOIUrl":"10.1016/j.matpur.2025.103753","url":null,"abstract":"<div><div>We study the concept of (generalized) <em>p</em>-th variation of a real-valued continuous function along a general class of refining sequence of partitions. We show that the finiteness of the <em>p</em>-th variation of a given function is closely related to the finiteness of <span><math><msup><mrow><mi>ℓ</mi></mrow><mrow><mi>p</mi></mrow></msup></math></span>-norm of the coefficients along a Schauder basis, similar to the fact that Hölder coefficient of the function is connected to <span><math><msup><mrow><mi>ℓ</mi></mrow><mrow><mo>∞</mo></mrow></msup></math></span>-norm of the Schauder coefficients. This result provides an isomorphism between the space of <em>α</em>-Hölder continuous functions with finite (generalized) <em>p</em>-th variation along a given partition sequence and a subclass of infinite-dimensional matrices equipped with an appropriate norm, in the spirit of Ciesielski.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"203 ","pages":"Article 103753"},"PeriodicalIF":2.1,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144320784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-01Epub Date: 2025-06-16DOI: 10.1016/j.matpur.2025.103750
Frédéric Charve
The asymptotics of the strongly stratified Boussinesq system when the Froude number goes to zero have been previously investigated, but the resulting limit system surprisingly did not depend on the thermal diffusivity . In this article we obtain richer asymptotics (depending on ) for more general ill-prepared initial data.
As for the rotating fluids system, the only way to reach this limit consists in finding suitable non-conventional initial data: here, to a function classically depending on the full space variable, we add a second one only depending on the vertical coordinate.
Thanks to a refined study of the structure of the limit system and to new adapted Strichartz estimates, we obtain convergence in the context of weak Leray-type solutions providing explicit convergence rates when possible. In the usually simpler case we are able to improve the Strichartz estimates and the convergence rates. The last part of the appendix is devoted to the proof of a new and crucial dispersion estimate, as classical methods fail.
Finally, our theorems can also be rewritten as a global existence result and asymptotic expansion for the classical Boussinesq system near an explicit stationary solution and for large non-conventional vertically stratified initial data.
{"title":"Hidden asymptotics for the weak solutions of the strongly stratified Boussinesq system without rotation","authors":"Frédéric Charve","doi":"10.1016/j.matpur.2025.103750","DOIUrl":"10.1016/j.matpur.2025.103750","url":null,"abstract":"<div><div>The asymptotics of the strongly stratified Boussinesq system when the Froude number goes to zero have been previously investigated, but the resulting limit system surprisingly did not depend on the thermal diffusivity <span><math><msup><mrow><mi>ν</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span>. In this article we obtain richer asymptotics (depending on <span><math><msup><mrow><mi>ν</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span>) for more general ill-prepared initial data.</div><div>As for the rotating fluids system, the only way to reach this limit consists in finding suitable non-conventional initial data: here, to a function classically depending on the full space variable, we add a second one only depending on the vertical coordinate.</div><div>Thanks to a refined study of the structure of the limit system and to new adapted Strichartz estimates, we obtain convergence in the context of weak Leray-type solutions providing explicit convergence rates when possible. In the usually simpler case <span><math><mi>ν</mi><mo>=</mo><msup><mrow><mi>ν</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> we are able to improve the Strichartz estimates and the convergence rates. The last part of the appendix is devoted to the proof of a new and crucial dispersion estimate, as classical methods fail.</div><div>Finally, our theorems can also be rewritten as a global existence result and asymptotic expansion for the classical Boussinesq system near an explicit stationary solution and for large non-conventional vertically stratified initial data.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"202 ","pages":"Article 103750"},"PeriodicalIF":2.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-01Epub Date: 2025-06-16DOI: 10.1016/j.matpur.2025.103751
Rufat Badal , Manuel Friedrich , Martin Kružík , Lennart Machill
According to the Nernst theorem or, equivalently, the third law of thermodynamics, the absolute zero temperature is not attainable. Starting with an initial positive temperature, we show that there exist solutions to a Kelvin-Voigt model for quasi-static nonlinear thermoviscoelasticity at a finite-strain setting [45], obeying an exponential-in-time lower bound on the temperature. Afterwards, we focus on the case of deformations near the identity and temperatures near a critical positive temperature, and we show that weak solutions of the nonlinear system converge in a suitable sense to solutions of a system in linearized thermoviscoelasticity. Our result extends the recent linearization result in [4], as it allows the critical temperature to be positive.
{"title":"Positive temperature in nonlinear thermoviscoelasticity and the derivation of linearized models","authors":"Rufat Badal , Manuel Friedrich , Martin Kružík , Lennart Machill","doi":"10.1016/j.matpur.2025.103751","DOIUrl":"10.1016/j.matpur.2025.103751","url":null,"abstract":"<div><div>According to the Nernst theorem or, equivalently, the third law of thermodynamics, the absolute zero temperature is not attainable. Starting with an initial positive temperature, we show that there exist solutions to a Kelvin-Voigt model for quasi-static nonlinear thermoviscoelasticity at a finite-strain setting <span><span>[45]</span></span>, obeying an exponential-in-time lower bound on the temperature. Afterwards, we focus on the case of deformations near the identity and temperatures near a critical positive temperature, and we show that weak solutions of the nonlinear system converge in a suitable sense to solutions of a system in linearized thermoviscoelasticity. Our result extends the recent linearization result in <span><span>[4]</span></span>, as it allows the critical temperature to be positive.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"202 ","pages":"Article 103751"},"PeriodicalIF":2.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-01Epub Date: 2025-06-13DOI: 10.1016/j.matpur.2025.103763
Vincenzo Antonelli , Francesco Malaspina , Simone Marchesi , Joan Pons-Llopis
In this work we study the moduli spaces of instanton bundles on the flag twistor space . We stratify them in terms of the minimal twist supporting global sections and we introduce the notion of (special) ‘t Hooft bundle on F. In particular we prove that there exist μ-stable ‘t Hooft bundles for each admissible charge k. We completely describe the geometric structure of the moduli space of (special) ‘t Hooft bundles for arbitrary charge k. Along the way to reach these goals, we describe the possible structures of multiple curves supported on some rational curves in F as well as the family of del Pezzo surfaces realized as hyperplane sections of F. Finally we investigate the splitting behavior of ‘t Hooft bundles when restricted to conics.
{"title":"‘t Hooft bundles on the complete flag threefold and moduli spaces of instantons","authors":"Vincenzo Antonelli , Francesco Malaspina , Simone Marchesi , Joan Pons-Llopis","doi":"10.1016/j.matpur.2025.103763","DOIUrl":"10.1016/j.matpur.2025.103763","url":null,"abstract":"<div><div>In this work we study the moduli spaces of instanton bundles on the flag twistor space <span><math><mi>F</mi><mo>:</mo><mo>=</mo><mi>F</mi><mo>(</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>)</mo></math></span>. We stratify them in terms of the minimal twist supporting global sections and we introduce the notion of (special) ‘t Hooft bundle on <em>F</em>. In particular we prove that there exist <em>μ</em>-stable ‘t Hooft bundles for each admissible charge <em>k</em>. We completely describe the geometric structure of the moduli space of (special) ‘t Hooft bundles for arbitrary charge <em>k</em>. Along the way to reach these goals, we describe the possible structures of multiple curves supported on some rational curves in <em>F</em> as well as the family of del Pezzo surfaces realized as hyperplane sections of <em>F</em>. Finally we investigate the splitting behavior of ‘t Hooft bundles when restricted to conics.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"202 ","pages":"Article 103763"},"PeriodicalIF":2.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-01Epub Date: 2025-06-13DOI: 10.1016/j.matpur.2025.103760
Yaxiong Liu , Zhuo Liu , Hui Yang , Xiangyu Zhou
In this paper, we obtain a Le Potier-type isomorphism theorem twisted with multiplier submodule sheaves, which relates a holomorphic vector bundle endowed with a strongly Nakano semi-positive singular Hermitian metric to the tautological line bundle with the induced metric. As applications, we obtain a Kollár-type injectivity theorem, a Nadel-type vanishing theorem, and a singular holomorphic Morse inequality for holomorphic vector bundles and so on.
{"title":"A Le Potier-type isomorphism twisted with multiplier submodule sheaves","authors":"Yaxiong Liu , Zhuo Liu , Hui Yang , Xiangyu Zhou","doi":"10.1016/j.matpur.2025.103760","DOIUrl":"10.1016/j.matpur.2025.103760","url":null,"abstract":"<div><div>In this paper, we obtain a Le Potier-type isomorphism theorem twisted with multiplier submodule sheaves, which relates a holomorphic vector bundle endowed with a strongly Nakano semi-positive singular Hermitian metric to the tautological line bundle with the induced metric. As applications, we obtain a Kollár-type injectivity theorem, a Nadel-type vanishing theorem, and a singular holomorphic Morse inequality for holomorphic vector bundles and so on.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"202 ","pages":"Article 103760"},"PeriodicalIF":2.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We study the stability of one-dimensional linear hyperbolic systems with non-symmetric relaxation. Introducing a new frequency-dependent Kalman stability condition, we prove an abstract decay result underpinning a form of inhomogeneous hypocoercivity. In contrast with the homogeneous setting, the decay rates depend on how the Kalman condition is fulfilled and, in most cases, a loss of derivative occurs: one must require an additional regularity assumption on the initial data to ensure the decay.
Under structural assumptions, we refine our abstract result by providing an algorithm, of wide applicability, for the construction of Lyapunov functionals. This allows us to systematically establish decay estimates for a given system and uncover algebraic cancellations (beyond the reach of the Kalman-based approach) reducing the loss of derivatives in high frequencies. To demonstrate the applicability of our method, we derive new stability results for the Sugimoto model, which describes the propagation of nonlinear acoustic waves, and for a beam model of Timoshenko type with memory.
{"title":"Large-time asymptotics for hyperbolic systems with non-symmetric relaxation: An algorithmic approach","authors":"Timothée Crin-Barat , Lorenzo Liverani , Ling-Yun Shou , Enrique Zuazua","doi":"10.1016/j.matpur.2025.103757","DOIUrl":"10.1016/j.matpur.2025.103757","url":null,"abstract":"<div><div>We study the stability of one-dimensional linear hyperbolic systems with non-symmetric relaxation. Introducing a new frequency-dependent Kalman stability condition, we prove an abstract decay result underpinning a form of <em>inhomogeneous hypocoercivity</em>. In contrast with the homogeneous setting, the decay rates depend on how the Kalman condition is fulfilled and, in most cases, a loss of derivative occurs: one must require an additional regularity assumption on the initial data to ensure the decay.</div><div>Under structural assumptions, we refine our abstract result by providing an algorithm, of wide applicability, for the construction of Lyapunov functionals. This allows us to systematically establish decay estimates for a given system and uncover algebraic cancellations (beyond the reach of the Kalman-based approach) reducing the loss of derivatives in high frequencies. To demonstrate the applicability of our method, we derive new stability results for the Sugimoto model, which describes the propagation of nonlinear acoustic waves, and for a beam model of Timoshenko type with memory.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"202 ","pages":"Article 103757"},"PeriodicalIF":2.1,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-01Epub Date: 2025-04-28DOI: 10.1016/j.matpur.2025.103720
Maxence Cassier , Patrick Joly , Luis Alejandro Rosas Martínez
This work concerns the analysis of electromagnetic dispersive media modelled by generalized Lorentz models. More precisely, this paper is the second of two articles dedicated to the long time behaviour of solutions of Maxwell's equations in dissipative Lorentz media, via the decay rate of the electromagnetic energy for the corresponding Cauchy problem. In opposition to the frequency dependent Lyapunov functions approach used in [4], we develop a method based on the spectral analysis of the underlying non selfadjoint operator of the model. Although more involved, this approach is closer to physics, as it uses the dispersion relation of the model, and has the advantage to provide more precise and more optimal results, leading to distinguish the notion of weak and strong dissipation.
{"title":"Long time behaviour of the solution of Maxwell's equations in dissipative generalized Lorentz materials (II) A modal approach","authors":"Maxence Cassier , Patrick Joly , Luis Alejandro Rosas Martínez","doi":"10.1016/j.matpur.2025.103720","DOIUrl":"10.1016/j.matpur.2025.103720","url":null,"abstract":"<div><div>This work concerns the analysis of electromagnetic dispersive media modelled by generalized Lorentz models. More precisely, this paper is the second of two articles dedicated to the long time behaviour of solutions of Maxwell's equations in dissipative Lorentz media, via the decay rate of the electromagnetic energy for the corresponding Cauchy problem. In opposition to the frequency dependent Lyapunov functions approach used in <span><span>[4]</span></span>, we develop a method based on the spectral analysis of the underlying non selfadjoint operator of the model. Although more involved, this approach is closer to physics, as it uses the dispersion relation of the model, and has the advantage to provide more precise and more optimal results, leading to distinguish the notion of weak and strong dissipation.</div></div>","PeriodicalId":51071,"journal":{"name":"Journal de Mathematiques Pures et Appliquees","volume":"201 ","pages":"Article 103720"},"PeriodicalIF":2.1,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}