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On Self-Similar Converging Shock Waves
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-04-03 DOI: 10.1007/s00205-025-02096-x
Juhi Jang, Jiaqi Liu, Matthew Schrecker

In this paper, we rigorously prove the existence of self-similar converging shock wave solutions for the non-isentropic Euler equations for (gamma in (1,3]). These solutions are analytic away from the shock interface before collapse, and the shock wave reaches the origin at the time of collapse. The region behind the shock undergoes a sonic degeneracy, which causes numerous difficulties for smoothness of the flow and the analytic construction of the solution. The proof is based on continuity arguments, nonlinear invariances, and barrier functions.

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引用次数: 0
Hydrodynamic Limit of Multiscale Viscoelastic Models for Rigid Particle Suspensions
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-03-20 DOI: 10.1007/s00205-025-02092-1
Mitia Duerinckx, Lucas Ertzbischoff, Alexandre Girodroux-Lavigne, Richard M. Höfer

We study the multiscale viscoelastic Doi model for suspensions of Brownian rigid rod-like particles, as well as its generalization by Saintillan and Shelley for self-propelled particles. We consider the regime of a small Weissenberg number, which corresponds to a fast rotational diffusion compared to the fluid velocity gradient, and we analyze the resulting hydrodynamic approximation. More precisely, we show the asymptotic validity of macroscopic nonlinear viscoelastic models, in form of so-called ordered fluid models, as an expansion in the Weissenberg number. The result holds for zero Reynolds number in 3D and for arbitrary Reynolds number in 2D. Along the way, we establish several new well-posedness and regularity results for nonlinear fluid models, which may be of independent interest.

{"title":"Hydrodynamic Limit of Multiscale Viscoelastic Models for Rigid Particle Suspensions","authors":"Mitia Duerinckx,&nbsp;Lucas Ertzbischoff,&nbsp;Alexandre Girodroux-Lavigne,&nbsp;Richard M. Höfer","doi":"10.1007/s00205-025-02092-1","DOIUrl":"10.1007/s00205-025-02092-1","url":null,"abstract":"<div><p>We study the multiscale viscoelastic Doi model for suspensions of Brownian rigid rod-like particles, as well as its generalization by Saintillan and Shelley for self-propelled particles. We consider the regime of a small Weissenberg number, which corresponds to a fast rotational diffusion compared to the fluid velocity gradient, and we analyze the resulting hydrodynamic approximation. More precisely, we show the asymptotic validity of macroscopic nonlinear viscoelastic models, in form of so-called ordered fluid models, as an expansion in the Weissenberg number. The result holds for zero Reynolds number in 3D and for arbitrary Reynolds number in 2D. Along the way, we establish several new well-posedness and regularity results for nonlinear fluid models, which may be of independent interest.</p></div>","PeriodicalId":55484,"journal":{"name":"Archive for Rational Mechanics and Analysis","volume":"249 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143668092","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}
引用次数: 0
The Least Action Admissibility Principle
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-03-09 DOI: 10.1007/s00205-025-02094-z
H. Gimperlein, M. Grinfeld, R. J. Knops, M. Slemrod

This paper provides a new admissibility criterion for choosing physically relevant weak solutions of the equations of Lagrangian and continuum mechanics when non-uniqueness of solutions to the initial value problem occurs. The criterion is motivated by the classical least action principle but is now applied to initial value problems which exhibit non-unique solutions. Examples are provided for Lagrangian mechanics and the Euler equations of barotropic fluid mechanics. In particular, we show that the least action admissibility principle prefers the classical two shock solution to the Riemann initial value problem to certain solutions generated by convex integration. On the other hand, Dafermos’s entropy criterion prefers convex integration solutions to the two shock solutions. Furthermore, when the pressure is given by (p(rho )=rho ^2), we show that the two shock solution is always preferred whenever the convex integration solutions are defined for the same initial data.

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引用次数: 0
Conservation Laws for p-Harmonic Systems with Antisymmetric Potentials and Applications
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-03-06 DOI: 10.1007/s00205-025-02085-0
Francesca Da Lio, Tristan Rivière

We prove that p-harmonic systems with antisymmetric potentials of the form

$$begin{aligned} -,text{ div }left( (1+|nabla u|^2)^{frac{p}{2}-1},nabla uright) =(1+|nabla u|^2)^{frac{p}{2}-1},Omega cdot nabla u, end{aligned}$$

((Omega ) is antisymmetric) can be written in divergence form as a conservation law

$$begin{aligned} -text{ div }left( (1+|nabla u|^2)^{frac{p}{2}-1},A,nabla uright) =nabla ^perp Bcdot nabla u. end{aligned}$$

This extends to the p-harmonic framework the original work of the second author for (p=2) (see Rivière in Invent Math 168(1):1–22, 2007). We give applications of the existence of this divergence structure in the analysis (prightarrow 2).

{"title":"Conservation Laws for p-Harmonic Systems with Antisymmetric Potentials and Applications","authors":"Francesca Da Lio,&nbsp;Tristan Rivière","doi":"10.1007/s00205-025-02085-0","DOIUrl":"10.1007/s00205-025-02085-0","url":null,"abstract":"<div><p>We prove that <i>p</i>-harmonic systems with antisymmetric potentials of the form </p><div><div><span>$$begin{aligned} -,text{ div }left( (1+|nabla u|^2)^{frac{p}{2}-1},nabla uright) =(1+|nabla u|^2)^{frac{p}{2}-1},Omega cdot nabla u, end{aligned}$$</span></div></div><p>(<span>(Omega )</span> is antisymmetric) can be written in divergence form as a conservation law </p><div><div><span>$$begin{aligned} -text{ div }left( (1+|nabla u|^2)^{frac{p}{2}-1},A,nabla uright) =nabla ^perp Bcdot nabla u. end{aligned}$$</span></div></div><p>This extends to the <i>p</i>-harmonic framework the original work of the second author for <span>(p=2)</span> (see Rivière in Invent Math 168(1):1–22, 2007). We give applications of the existence of this divergence structure in the analysis <span>(prightarrow 2)</span>.</p></div>","PeriodicalId":55484,"journal":{"name":"Archive for Rational Mechanics and Analysis","volume":"249 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00205-025-02085-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
BCS Critical Temperature on Half-Spaces
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-03-02 DOI: 10.1007/s00205-025-02088-x
Barbara Roos, Robert Seiringer

We study the BCS critical temperature on half-spaces in dimensions (d=1,2,3) with Dirichlet or Neumann boundary conditions. We prove that the critical temperature on a half-space is strictly higher than on (mathbb {R}^d), at least at weak coupling in (d=1,2) and weak coupling and small chemical potential in (d=3). Furthermore, we show that the relative shift in critical temperature vanishes in the weak coupling limit.

我们研究了在(d=1,2,3)维度的半空间上的BCS临界温度,它具有迪里希特或诺伊曼边界条件。我们证明,半空间上的临界温度严格高于(mathbb {R}^d)上的临界温度,至少在(d=1,2)的弱耦合以及(d=3)的弱耦合和小化学势下是如此。此外,我们还证明临界温度的相对移动在弱耦合极限下消失了。
{"title":"BCS Critical Temperature on Half-Spaces","authors":"Barbara Roos,&nbsp;Robert Seiringer","doi":"10.1007/s00205-025-02088-x","DOIUrl":"10.1007/s00205-025-02088-x","url":null,"abstract":"<div><p>We study the BCS critical temperature on half-spaces in dimensions <span>(d=1,2,3)</span> with Dirichlet or Neumann boundary conditions. We prove that the critical temperature on a half-space is strictly higher than on <span>(mathbb {R}^d)</span>, at least at weak coupling in <span>(d=1,2)</span> and weak coupling and small chemical potential in <span>(d=3)</span>. Furthermore, we show that the relative shift in critical temperature vanishes in the weak coupling limit.</p></div>","PeriodicalId":55484,"journal":{"name":"Archive for Rational Mechanics and Analysis","volume":"249 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00205-025-02088-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Well-Posedness of Degenerate Initial-Boundary Value Problems to a Hyperbolic-Parabolic Coupled System Arising from Nematic Liquid Crystals
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-02-28 DOI: 10.1007/s00205-025-02093-0
Yanbo Hu, Yuusuke Sugiyama

This paper is focused on the local well-posedness of initial-boundary value and Cauchy problems to a one-dimensional quasilinear hyperbolic-parabolic coupled system with boundary or far field degenerate initial data. The governing system is derived from the theory of nematic liquid crystals, which couples a hyperbolic equation describing the crystal property and a parabolic equation describing the liquid property of the material. The hyperbolic equation is degenerate at the boundaries or spatial infinity, which results in the classical methods for the strictly hyperbolic-parabolic coupled systems being invalid. We introduce admissible weighted function spaces and apply the parametrix method to construct iteration mappings for these two degenerate problems separately. The local existence and uniqueness of classical solutions of the degenerate initial-boundary value and Cauchy problems are established by the contraction mapping principle in their selected function spaces. Moreover, the solutions have no loss of regularity and their existence times are independent of the spatial variable.

{"title":"Well-Posedness of Degenerate Initial-Boundary Value Problems to a Hyperbolic-Parabolic Coupled System Arising from Nematic Liquid Crystals","authors":"Yanbo Hu,&nbsp;Yuusuke Sugiyama","doi":"10.1007/s00205-025-02093-0","DOIUrl":"10.1007/s00205-025-02093-0","url":null,"abstract":"<div><p>This paper is focused on the local well-posedness of initial-boundary value and Cauchy problems to a one-dimensional quasilinear hyperbolic-parabolic coupled system with boundary or far field degenerate initial data. The governing system is derived from the theory of nematic liquid crystals, which couples a hyperbolic equation describing the crystal property and a parabolic equation describing the liquid property of the material. The hyperbolic equation is degenerate at the boundaries or spatial infinity, which results in the classical methods for the strictly hyperbolic-parabolic coupled systems being invalid. We introduce admissible weighted function spaces and apply the parametrix method to construct iteration mappings for these two degenerate problems separately. The local existence and uniqueness of classical solutions of the degenerate initial-boundary value and Cauchy problems are established by the contraction mapping principle in their selected function spaces. Moreover, the solutions have no loss of regularity and their existence times are independent of the spatial variable.</p></div>","PeriodicalId":55484,"journal":{"name":"Archive for Rational Mechanics and Analysis","volume":"249 2","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513360","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}
引用次数: 0
Quantitative Homogenization of State-Constraint Hamilton–Jacobi Equations on Perforated Domains and Applications
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-02-25 DOI: 10.1007/s00205-025-02091-2
Yuxi Han, Wenjia Jing, Hiroyoshi Mitake, Hung V. Tran

We study the periodic homogenization problem of state-constraint Hamilton–Jacobi equations on perforated domains in the convex setting and obtain the optimal convergence rate. We then consider a dilute situation in which the diameter of the holes is much smaller than the microscopic scale. Finally, a homogenization problem with domain defects where some holes are missing is analyzed.

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引用次数: 0
Local Decay Estimates 当地衰减估计值
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-02-13 DOI: 10.1007/s00205-025-02089-w
Avy Soffer, Xiaoxu Wu

We give a proof of local decay estimates for Schrödinger-type equations, which is based on the knowledge of Asymptotic Completeness. This approach extends to time dependent potential perturbations, as it does not rely on Resolvent Estimates or related methods. Global in time Strichartz estimates follow for quasi-periodic time-dependent potentials from our results.

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引用次数: 0
On the Minimization of the Willmore Energy Under a Constraint on Total Mean Curvature and Area
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-02-13 DOI: 10.1007/s00205-025-02087-y
Christian Scharrer, Alexander West

Motivated by a model for lipid bilayer cell membranes, we study the minimization of the Willmore functional in the class of oriented closed surfaces with prescribed total mean curvature, prescribed area, and prescribed genus. Adapting methods previously developed by Keller–Mondino–Rivière, Bauer–Kuwert, and Ndiaye–Schätzle, we prove the existence of smooth minimizers for a large class of constraints. Moreover, we analyze the asymptotic behaviour of the energy profile close to the unit sphere and consider the total mean curvature of axisymmetric surfaces.

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引用次数: 0
Minimizers for an Aggregation Model with Attractive–Repulsive Interaction 具有吸引力-反冲性相互作用的聚集模型的最小化模型
IF 2.6 1区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-02-11 DOI: 10.1007/s00205-025-02084-1
Rupert L. Frank, Ryan W. Matzke

We solve explicitly a certain minimization problem for probability measures involving an interaction energy that is repulsive at short distances and attractive at large distances. We complement earlier works by showing that in an optimal part of the remaining parameter regime all minimizers are uniform distributions on a surface of a sphere, thus showing concentration on a lower dimensional set. Our method of proof uses convexity estimates on hypergeometric functions.

我们明确地解决了涉及相互作用能量的概率计量的某个最小化问题,这种相互作用能量在短距离内是排斥的,在大距离内是吸引的。我们通过证明在剩余参数机制的最优部分,所有最小化量都是球面上的均匀分布,从而显示了在低维集合上的集中,补充了之前的工作。我们的证明方法使用了超几何函数的凸性估计。
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引用次数: 0
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