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Optimal coordinates for Ricci-flat conifolds Ricci-flat conifolds 的最佳坐标
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-22 DOI: 10.1007/s00526-024-02780-y
Klaus Kröncke, Áron Szabó
{"title":"Optimal coordinates for Ricci-flat conifolds","authors":"Klaus Kröncke, Áron Szabó","doi":"10.1007/s00526-024-02780-y","DOIUrl":"https://doi.org/10.1007/s00526-024-02780-y","url":null,"abstract":"<p>We compute the indicial roots of the Lichnerowicz Laplacian on Ricci-flat cones and give a detailed description of the corresponding radially homogeneous tensor fields in its kernel. For a Ricci-flat conifold (<i>M</i>, <i>g</i>) which may have asymptotically conical as well as conically singular ends, we compute at each end a lower bound for the order with which the metric converges to the tangent cone. As a special subcase of our result, we show that any Ricci-flat ALE manifold <span>((M^n,g))</span> is of order <i>n</i> and thereby close a small gap in a paper by Cheeger and Tian.\u0000</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"19 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Non-uniqueness for the compressible Euler–Maxwell equations 可压缩欧拉-麦克斯韦方程的非唯一性
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-20 DOI: 10.1007/s00526-024-02798-2
Shunkai Mao, Peng Qu
{"title":"Non-uniqueness for the compressible Euler–Maxwell equations","authors":"Shunkai Mao, Peng Qu","doi":"10.1007/s00526-024-02798-2","DOIUrl":"https://doi.org/10.1007/s00526-024-02798-2","url":null,"abstract":"<p>We consider the Cauchy problem for the isentropic compressible Euler–Maxwell equations under general pressure laws in a three-dimensional periodic domain. For any smooth initial electron density away from the vacuum and smooth equilibrium-charged ion density, we could construct infinitely many <span>(alpha )</span>-Hölder continuous entropy solutions emanating from the same initial data for <span>(alpha &lt;frac{1}{7})</span>. Especially, the electromagnetic field belongs to the Hölder class <span>(C^{1,alpha })</span>. Furthermore, we provide a continuous entropy solution satisfying the entropy inequality strictly. The proof relies on the convex integration scheme. Due to the constrain of the Maxwell equations, we propose a method of Mikado potential and construct new building blocks.</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"167 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
A De Lellis–Müller type estimate on the Minkowski lightcone 关于闵科夫斯基光锥的德莱里斯-缪勒式估计
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-20 DOI: 10.1007/s00526-024-02784-8
Markus Wolff
{"title":"A De Lellis–Müller type estimate on the Minkowski lightcone","authors":"Markus Wolff","doi":"10.1007/s00526-024-02784-8","DOIUrl":"https://doi.org/10.1007/s00526-024-02784-8","url":null,"abstract":"<p>We prove an analogue statement to an estimate by De Lellis–Müller in <span>(mathbb {R}^3)</span> on the standard Minkowski lightcone. More precisely, we show that under some additional assumptions, any spacelike cross section of the standard lightcone is <span>(W^{2,2})</span>-close to a round surface provided the trace-free part of a scalar second fundamental form <i>A</i> is sufficiently small in <span>(L^2)</span>. To determine the correct intrinsically round cross section of reference, we define an associated 4-vector, which transforms equivariantly under Lorentz transformations in the restricted Lorentz group. A key step in the proof consists of a geometric, scaling invariant estimate, and we give two different proofs. One utilizes a recent characterization of singularity models of null mean curvature flow along the standard lightcone by the author, while the other is heavily inspired by an almost-Schur lemma by De Lellis–Topping.</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"47 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
On potentials whose level sets are orbits 关于水平集为轨道的势
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-20 DOI: 10.1007/s00526-024-02790-w
Philippe Bolle, Marco Mazzucchelli, Andrea Venturelli
{"title":"On potentials whose level sets are orbits","authors":"Philippe Bolle, Marco Mazzucchelli, Andrea Venturelli","doi":"10.1007/s00526-024-02790-w","DOIUrl":"https://doi.org/10.1007/s00526-024-02790-w","url":null,"abstract":"<p>A level orbit of a mechanical Hamiltonian system is a solution of Newton equation that is contained in a level set of the potential energy. In 2003, Mark Levi asked for a characterization of the smooth potential energy functions on the plane with the property that any point on the plane lies on a level orbit; we call such functions Levi potentials. The basic examples are the radial monotone increasing smooth functions. In this paper we show that any Levi potential that is analytic or has totally path-disconnected critical set must be radial. Nevertheless, we show that every compact convex subset of the plane is the critical set of a Levi potential. A crucial observation for these theorems is that, outside the critical set, the family of level sets of a Levi potential forms a solution of the inverse curvature flow.\u0000</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"84 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
On Ricci flows with closed and smooth tangent flows 关于具有封闭平稳切线流的利玛窦流
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-16 DOI: 10.1007/s00526-024-02778-6
Pak-Yeung Chan, Zilu Ma, Yongjia Zhang
{"title":"On Ricci flows with closed and smooth tangent flows","authors":"Pak-Yeung Chan, Zilu Ma, Yongjia Zhang","doi":"10.1007/s00526-024-02778-6","DOIUrl":"https://doi.org/10.1007/s00526-024-02778-6","url":null,"abstract":"<p>In this paper, we consider Ricci flows admitting closed and smooth tangent flows in the sense of Bamler (Structure theory of non-collapsed limits of Ricci flows, 2020. arXiv:2009.03243). The tangent flow in question can be either a tangent flow at infinity for an ancient Ricci flow, or a tangent flow at a singular point for a Ricci flow developing a finite-time singularity. Among other things, we prove: (1) that in these cases the tangent flow must be unique, (2) that if a Ricci flow with finite-time singularity has a closed singularity model, then the singularity is of Type I and the singularity model is the tangent flow at the singular point; this answers a question proposed in Chow et al. (The Ricci flow: techniques and applications. Part III. Geometric-analytic aspects. Mathematical surveys and monographs, vol 163. AMS, Providence, 2010), (3) a dichotomy theorem that characterizes ancient Ricci flows admitting a closed and smooth backward sequential limit.\u0000</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"11 12 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Regularity in the two-phase Bernoulli problem for the p-Laplace operator p 拉普拉斯算子两相伯努利问题中的正则性
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-16 DOI: 10.1007/s00526-024-02789-3
Masoud Bayrami, Morteza Fotouhi
{"title":"Regularity in the two-phase Bernoulli problem for the p-Laplace operator","authors":"Masoud Bayrami, Morteza Fotouhi","doi":"10.1007/s00526-024-02789-3","DOIUrl":"https://doi.org/10.1007/s00526-024-02789-3","url":null,"abstract":"<p>We show that any minimizer of the well-known ACF functional (for the <i>p</i>-Laplacian) constitutes a viscosity solution. This allows us to establish a uniform flatness decay at the two-phase free boundary points to improve the flatness, which boils down to <span>(C^{1,eta })</span> regularity of the flat part of the free boundary. This result, in turn, is used to prove the Lipschitz regularity of minimizers by a dichotomy argument. It is noteworthy that the analysis of branch points is also included.\u0000</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"37 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Extension operators and Korn inequality for variable coefficients in perforated domains with applications to homogenization of viscoelastic non-simple materials 穿孔域中可变系数的扩展算子和科恩不等式及其在粘弹性非简单材料均质化中的应用
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-16 DOI: 10.1007/s00526-024-02793-7
Markus Gahn
{"title":"Extension operators and Korn inequality for variable coefficients in perforated domains with applications to homogenization of viscoelastic non-simple materials","authors":"Markus Gahn","doi":"10.1007/s00526-024-02793-7","DOIUrl":"https://doi.org/10.1007/s00526-024-02793-7","url":null,"abstract":"<p>In this paper we present the homogenization for nonlinear viscoelastic second-grade non-simple perforated materials at large strain in the quasistatic setting. The reference domain <span>(Omega _{varepsilon })</span> is periodically perforated and is depending on the scaling parameter <span>(varepsilon )</span> which describes the ratio between the size of the whole domain and the small periodic perforations. The mechanical energy depends on the gradient and also the second gradient of the deformation, and also respects positivity of the determinant of the deformation gradient. For the viscous stress we assume dynamic frame indifference and it is therefore depending on the rate of the Cauchy-stress tensor. For the derivation of the homogenized model for <span>(varepsilon rightarrow 0)</span> we use the method of two-scale convergence. For this uniform <i>a priori</i> estimates with respect to <span>(varepsilon )</span> are necessary. The most crucial part is to estimate the rate of the deformation gradient. Due to the time-dependent frame indifference of the viscous term, we only get coercivity with respect to the rate of the Cauchy-stress tensor. To overcome this problem we derive a Korn inequality for non-constant coefficients on the perforated domain. The crucial point is to verify that the constant in this inequality, which is usually depending on the domain, can be chosen independently of the parameter <span>(varepsilon )</span>. Further, we construct an extension operator for second order Sobolev spaces on perforated domains with operator norm independent of <span>(varepsilon )</span>.</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"73 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Variational aspects of the generalized Seiberg–Witten functional 广义塞伯格-维滕函数的变量问题
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-16 DOI: 10.1007/s00526-024-02771-z
Wanjun Ai, Shuhan Jiang, Jürgen Jost
{"title":"Variational aspects of the generalized Seiberg–Witten functional","authors":"Wanjun Ai, Shuhan Jiang, Jürgen Jost","doi":"10.1007/s00526-024-02771-z","DOIUrl":"https://doi.org/10.1007/s00526-024-02771-z","url":null,"abstract":"<p>In this paper, as a step towards a unified mathematical treatment of the gauge functionals from quantum field theory that have found profound applications in mathematics, we generalize the Seiberg–Witten functional that in particular includes the Kapustin–Witten functional as a special case. We first demonstrate the smoothness of weak solutions to this generalized functional. We then establish the existence of weak solutions under the assumption that the structure group of the bundle is abelian, by verifying the Palais–Smale compactness.</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"32 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Second order necessary condition for a strong minimum in the classical problem of calculus of variations 变化微积分经典问题中强最小值的二阶必要条件
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-13 DOI: 10.1007/s00526-024-02795-5
A. D. Ioffe
{"title":"Second order necessary condition for a strong minimum in the classical problem of calculus of variations","authors":"A. D. Ioffe","doi":"10.1007/s00526-024-02795-5","DOIUrl":"https://doi.org/10.1007/s00526-024-02795-5","url":null,"abstract":"<p>The paper offers a second order necessary condition for a strong minimum in the standard problem of calculus of variations. No idea of such a result seems to have appeared in the classical theory. But a simple example given in the paper shows that the condition can work when all known conditions fail. At the same time, the proof of the proposition is fairly simple. It is also explained in the paper that the condition effectively works only for problems with integrands not convex with respect to the last (derivative) argument.</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"41 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Minkowski content estimates for generic area minimizing hypersurfaces 一般面积最小超曲面的闵科夫斯基内容估计值
IF 2.1 2区 数学
Calculus of Variations and Partial Differential Equations Pub Date : 2024-07-13 DOI: 10.1007/s00526-024-02791-9
Xuanyu Li
{"title":"Minkowski content estimates for generic area minimizing hypersurfaces","authors":"Xuanyu Li","doi":"10.1007/s00526-024-02791-9","DOIUrl":"https://doi.org/10.1007/s00526-024-02791-9","url":null,"abstract":"<p>Let <span>(Gamma )</span> be a smooth, closed, oriented, <span>((n-1))</span>-dimensional submanifold of <span>(mathbb {R}^{n+1})</span>. It was shown by Chodosh–Mantoulidis–Schulze [6] that one can perturb <span>(Gamma )</span> to a nearby <span>(Gamma ')</span> such that all minimizing currents with boundary <span>(Gamma ')</span> are smooth away from a set with Hausdorff dimension less than <span>(n-9)</span>. We prove that the perturbation can be made such that the singular set of the minimizing current with boundary <span>(Gamma ')</span> has Minkowski dimension less than <span>(n-9)</span>.</p>","PeriodicalId":9478,"journal":{"name":"Calculus of Variations and Partial Differential Equations","volume":"58 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141612816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
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