Nonlinear periodic waves on the Einstein cylinder

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Athanasios Chatzikaleas, Jacques Smulevici
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引用次数: 0

Abstract

Motivated by the study of small amplitude nonlinear waves in the anti-de Sitter spacetime and in particular the conjectured existence of periodic in time solutions to the Einstein equations, we construct families of arbitrary small time-periodic solutions to the conformal cubic wave equation and the spherically symmetric Yang–Mills equations on the Einstein cylinder × 𝕊3. For the conformal cubic wave equation, we consider both spherically symmetric solutions and complex-valued aspherical solutions with an ansatz relying on the Hopf fibration of the 3-sphere. In all three cases, the equations reduce to 1+1 semilinear wave equations.

Our proof relies on a theorem of Bambusi–Paleari for which the main assumption is the existence of a seed solution, given by a nondegenerate zero of a nonlinear operator associated with the resonant system. For the problems that we consider, such seed solutions are simply given by the mode solutions of the linearized equations. Provided that the Fourier coefficients of the systems can be computed, the nondegeneracy conditions then amount to solving infinite dimensional linear systems. Since the eigenfunctions for all three cases studied are given by Jacobi polynomials, we derive the different Fourier and resonant systems using linearization and connection formulas as well as integral transformation of Jacobi polynomials.

In the Yang–Mills case, the original version of the theorem of Bambusi–Paleari is not applicable because the nonlinearity of smallest degree is nonresonant. The resonant terms are then provided by the next order nonlinear terms with an extra correction due to backreaction terms of the smallest degree of nonlinearity, and we prove an analogous theorem in this setting.

爱因斯坦圆柱体上的非线性周期波
受反德西特时空中小振幅非线性波研究的启发,特别是爱因斯坦方程时间周期解存在的猜想,我们在爱因斯坦圆柱体ℝ× ᵔ3上构建了共形立方波方程和球面对称杨-米尔斯方程的任意小时间周期解族。对于共形立方波方程,我们考虑了球面对称解和复值非球面解,其解析依赖于 3 球的霍普夫纤维。在所有三种情况下,方程都简化为 1+1 半线性波方程。 我们的证明依赖于 Bambusi-Paleari 的一个定理,其主要假设是存在一个种子解,该种子解由与共振系统相关的非线性算子的非enerate 零点给出。对于我们所考虑的问题,这种种子解就是线性化方程的模解。只要能计算出系统的傅立叶系数,那么非整定条件就相当于求解无限维线性系统。由于所研究的三种情况的特征函数都是由雅各比多项式给出的,我们利用线性化和连接公式以及雅各比多项式的积分变换推导出了不同的傅里叶和共振系统。 在杨-米尔斯情况下,班布西-帕利佩里定理的原始版本并不适用,因为最小度的非线性是非共振的。共振项则由下一阶非线性项提供,并由最小非线性度的反作用项进行额外修正,我们证明了这种情况下的类似定理。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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