Dissertations / Theses on the topic 'Strichartz estimates'
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Dinh, Van Duong. "Strichartz estimates and the nonlinear Schrödinger-type equations." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30247/document.
Full textThis dissertation is devoted to the study of linear and nonlinear aspects of the Schrödinger-type equations [ i partial_t u + |nabla|^sigma u = F, quad |nabla| = sqrt {-Delta}, quad sigma in (0, infty).] When $sigma = 2$, it is the well-known Schrödinger equation arising in many physical contexts such as quantum mechanics, nonlinear optics, quantum field theory and Hartree-Fock theory. When $sigma in (0,2) backslash {1}$, it is the fractional Schrödinger equation, which was discovered by Laskin (see e.g. cite{Laskin2000} and cite{Laskin2002}) owing to the extension of the Feynman path integral, from the Brownian-like to Lévy-like quantum mechanical paths. This equation also appears in the water waves model (see e.g. cite{IonescuPusateri} and cite{Nguyen}). When $sigma = 1$, it is the half-wave equation which arises in water waves model (see cite{IonescuPusateri}) and in gravitational collapse (see cite{ElgartSchlein}, cite{FrohlichLenzmann}). When $sigma =4$, it is the fourth-order or biharmonic Schrödinger equation introduced by Karpman cite {Karpman} and by Karpman-Shagalov cite{KarpmanShagalov} taking into account the role of small fourth-order dispersion term in the propagation of intense laser beam in a bulk medium with Kerr nonlinearity. This thesis is divided into two parts. The first part studies Strichartz estimates for Schrödinger-type equations on manifolds including the flat Euclidean space, compact manifolds without boundary and asymptotically Euclidean manifolds. These Strichartz estimates are known to be useful in the study of nonlinear dispersive equation at low regularity. The second part concerns the study of nonlinear aspects such as local well-posedness, global well-posedness below the energy space and blowup of rough solutions for nonlinear Schrödinger-type equations.[...]
Ovcharov, Evgeni Y. "Global regularity of nonlinear dispersive equations and Strichartz estimates." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4600.
Full textSavostianov, Anton. "Strichartz estimates and smooth attractors of dissipative hyperbolic equations." Thesis, University of Surrey, 2015. http://epubs.surrey.ac.uk/808756/.
Full textBlair, Matthew D. "Strichartz estimates for wave equations with coefficients of Sobolev regularity /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/5745.
Full textMeas, Len. "Estimations de dispersion et de Strichartz dans un domaine cylindrique convexe." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4038/document.
Full textIn this work, we establish local in time dispersive estimates and its application to Strichartz estimates for solutions of the model case Dirichlet wave equation inside cylindrical convex domains Ω ⊂ R³ with smooth boundary ∂Ω ≠ ∅. Let us recall that dispersive estimates are key ingredients to prove Strichartz estimates. Strichartz estimates for waves inside an arbitrary domain Ω have been proved by Blair, Smith, Sogge [6,7]. Optimal estimates in strictly convex domains have been obtained in [29]. Our case of cylindrical domains is an extension of the result of [29] in the case where the nonnegative curvature radius depends on the incident angle and vanishes in some directions
Bolleyer, Andreas [Verfasser], and L. [Akademischer Betreuer] Weis. "Spectrally Localized Strichartz Estimates and Nonlinear Schrödinger Equations / Andreas Bolleyer. Betreuer: L. Weis." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1071894269/34.
Full textMetcalfe, Jason L. "Global Strichartz estimates for solutions of the wave equation exterior to a convex obstacle." Available to US Hopkins community, 2003. http://wwwlib.umi.com/dissertations/dlnow/308072.
Full textNegro, Giuseppe. "Sharp estimates for linear and nonlinear wave equations via the Penrose transform." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCD071.
Full textWe apply the Penrose transform, which is a basic tool of relativistic physics, to the study of sharp estimates for linear and nonlinear wave equations. We disprove a conjecture of Foschi, regarding extremizers for the Strichartz inequality with data in the Sobolev space Ḣ½ x Ḣ⁻½ (Rᵈ), for even d ⩾2. On the other hand, we provide evidence to support the conjecture in odd dimensions and refine his sharp inequality in R¹⁺³, adding a term proportional to the distance of the initial data from the set of extremizers. Using this, we provide an asymptotic formula for the Strichartz norm of small solutions to the cubic wave equation in Minkowski space. The leading coefficient is given by Foschi’s sharp constant. We calculate the constant in the second term, whose absolute value and sign changes depending on whether the equation is focusing or defocusing
Aplicamos la transformada de Penrose, una herramienta básica de la fı́sica relativista, a unas estimaciones óptimas para ecuaciones de ondas lineales y no lineales. Invalidamos una conjetura de Foschi, sobre extremizadores para la estimación de Strichartz con datos en el espaciode Sobolev Ḣ½ x Ḣ⁻½ (Rᵈ), para d ⩾2 par. Por otro lado, vamos a dar indicios en favor de su conjetura en dimension impar, ası́ como una versión refinada de su desigualdad óptimaen R¹⁺³, añadiendo un término proporcional a la distancia de los datos iniciales del conjuntode puntos extremales. Utilizando este resultado, conseguimos una fórmula asintótica para la norma de Strichartz de soluciones pequeñas de la ecuación de ondas cúbica en el espacio-tiempo de Minkowski. El coeficiente principal coincide con la constante óptima de Foschi. Calculamos explı́citamente el coeficiente del otro término, cuyo módulo y signo cambian dependiendo de siestamos en el caso focusing o defocusing
Chen, I.-Kun. "Spherical averaged endpoint Strichartz estimates for the two-dimensional Schrodinger equations with inverse square potential." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9473.
Full textThesis research directed by: Dept. of Mathematics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Abdelkaled, Houda. "Caractère bien posé probabiliste pour une équation non linéaire faiblement dispersive." Thesis, CY Cergy Paris Université, 2020. http://www.theses.fr/2020CYUN1075.
Full textWe propose in this thesis to study the propagation of non-linear wavesin the high frequency regime by methods from probability theoryand the theory of partial differential equations. We consider the cubic fractional wave equation, posed on a bounded domain of Euclidean space, with conditionsat the edge periodic. We will show to begin with, on which spaces this problem iswell-posed in Hadamard’s sense using fixed point methods. Then, we're going to proof high frequency instability results that shows thelimit of standard methods. Finally, we will consider building probabilistic measures on the space of the initial data such as in the context of the instability results, a well-posedness form persists, almost surely
Lim, Zhuo Min. "Well-posedness and scattering of the Chern-Simons-Schrödinger system." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267816.
Full textScrobogna, Stefano. "On some models in geophysical fluids." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0601/document.
Full textIn this thesis we discuss three models describing the dynamics of density-dependent fluids in long lifes pans and on a planetary scale. In such setting the relative displacement induced by various external physical forces, such as the Coriolis force and the stratification buoyancy, is far more relevant than the intrinsic motion generated by the collision of particles of the fluid itself. Such disproportion of balance limits hence the motion, inducing persistent structures in the velocity flow.On a mathematical level one of the main difficulties relies in giving a full description of the perturbations induced by the external forces, which propagate at high speed. This analysis can be performed by the aid of several tools, we chose here to adopt techniques characteristic of harmonic analysis, such as the analysis of the dispersive properties of highly oscillating integrals.All along the thesis we consider boundary-free, three-dimensional domains, and inspecific we study only the case in which the domain in either the whole space or the periodic space . The models we consider are the following ones : primitive equations with comparable Froude and Rossby number and zero vertical diffusivity, density-dependent stratified fluids in low Froude number regime, weakly compressible and fast rotating fluid in a regime in which Mach and Rossbynumber are comparable. We prove that these systems propagate globally-in-time data with low-regularity. Nosmallness assumption is ever made, specific constructive hypothesis are assumed on the initial data when required
Lafontaine, David. "Effets dispersifs et asymptotique en temps long d'équations d'ondes dans des domaines extérieurs." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4067/document.
Full textWe are concerned with Schrödinger and wave equations, both linear and non linear, in exterior domains. In particular, we are interested in the so-called Strichartz estimates, which are a family of dispersive estimates measuring decay for the linear flow. They turn out to be particularly useful in order to study the corresponding non linear equations. In non-captive geometries, where all the rays of geometrical optics go to infinity, many results show that Strichartz estimates hold with no loss with respect to the flat case. Moreover, the local smoothing estimates for the Schrödinger equation, respectively the local energy decay for the wave equation, which are another family of dispersive estimates, are known to fail in any captive geometry. In contrast, we show Strichartz estimates without loss in an unstable captive geometry: the exterior of many strictly convex obstacles verifying Ikawa's condition. The second part of this thesis is dedicated to the study of the long time asymptotics of the corresponding non linear equations. We expect that they behave linearly in large times, or scatter, when the domain they live in does not induce too much concentration effect. We show such a result for the non linear critical wave equation in the exterior of a class of obstacles generalizing star-shaped bodies. In the exterior of two strictly convex obstacles, we obtain a rigidity result concerning compact flow solutions, which is a first step toward a general result. Finally, we consider the non linear Schrödinger equation in the free space but with a potential. We prove that solutions scatter for a repulsive potential, and for a sum of two repulsive potentials with strictly convex level surfaces. This provides a scattering result in a framework similar to the exterior of two strictly convex obstacles
Kian, Yavar. "Equations des ondes avec des perturbations dépendantes du temps." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14101/document.
Full textPinto, Aldo Vieira. "Teoria de Littlewood-Paley e o problema de Cauchy para a equação da onda cúbica." Universidade Federal de São Carlos, 2010. https://repositorio.ufscar.br/handle/ufscar/5867.
Full textFinanciadora de Estudos e Projetos
Neste trabalho, estudamos o resultado de boa-colocação para a equação da onda cúbica u +uR3 = 0 em R3, devido a H. Bahouri e J.-Y. Chemin, no qual os dados de Cauchy estão no espaço de Sobolev homogêneo H3/4 (R3) H-1/4 (R3). A prova utiliza um método de interpolação não-linear, decomposição de Bony e desigualdade logarítmica de Strichartz, todas formuladas na Teoria de Littlewood-Paley.
Nascimento, Wanderley Nunes do. "Klein-Gordon models with non-effective time-dependent potential." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/7453.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
In this thesis we study the asymptotic properties for the solution of the Cauchy problem for the Klein-Gordon equation with non-effective time-dependent potential. The main goal was define a suitable energy related to the Cauchy problem and derive decay estimates for such energy. Strichartz’ estimates and results of scattering and modified scattering was established. The C m theory and the stabilization condition was applied to treat the case where the coefficient of the potential term has very fast oscillations. Moreover, we consider a semi-linear wave model scale-invariant time- dependent with mass and dissipation, in this step we used linear estimates related with the semi-linear model to prove global existence (in time) of energy solutions for small data and we show a blow-up result for a suitable choice of the coefficients.
Nesta tese estudamos as propriedades assintóticas para a solução do problema de Cauchy para a equação de Klein-Gordon com potencial não efetivo dependente do tempo. O principal objetivo foi definir uma energia adequada relacionada ao problema de Cauchy e derivar estimativas para tal energia. Estimativas de Strichartz e resultados de scatering e scatering modificados também foram estabelecidos. A teoria C m e a condição de estabilização foram aplicados para tratar o caso em que o coeficiente da massa oscila muito rápido. Além disso, consideramos um mod- elo de onda semi-linear scale-invariante com massa e dissipação dependentes do tempo, nesta etapa usamos as estimativas lineares de tal modelo para provar ex- istência global (no tempo) de solução de energia para dados iniciais suficientemente pequenos e demonstramos um resultado de blow-up para uma escolha adequada dos coeficientes.
Nguyen, Quang Huy. "Analyse hautes fréquences pour les équations des ondes de surface." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS175.
Full textThis dissertation is devoted to the mathematical analysis of the water waves systems. We focus on the dispersive property and the Cauchy problem for rough initial data. One of the main objects of study is the gravity-capillary water waves system. We establish blow-up criteria and the persistence of Sobolev regularity. By proving Strichartz estimates for rough solutions, we obtain Cauchy theories for non-Lipschitz initial velocity. In another part of the dissertation, we study the dispersive property of the fully nonlinear water waves systems. More specifically, we are interested in Strichartz estimates. We prove for sufficiently smooth solutions that the nonlinear systems obey the same Strichartz estimates as their linearizations do
Hassani, Ali. "ÉQUATION DES ONDES SUR LES ESPACES SYMÉTRIQUES RIEMANNIENS DE TYPE NON COMPACT." Phd thesis, Université de Nanterre - Paris X, 2011. http://tel.archives-ouvertes.fr/tel-00669082.
Full textFarias, Marcos Alves de. "O problema de Cauchy para a equação da onda cúbica." Universidade Federal de São Carlos, 2011. https://repositorio.ufscar.br/handle/ufscar/5878.
Full textFinanciadora de Estudos e Projetos
In this work, we study the result of global well-Posedness for the cubic wave equation @2 t u_u+u3 = 0 in R_R3, where the Cauchy data is in the Sobolev space Hs(R3)_ Hs1(R3) with 13 18 < s < 1. The proof is based on the work of T. Roy, [23], in this paper Roy propose a almost conservation law for the energy and from this he get a inequality that together with the local well-posedness theory proved by Lindbald and Sogge in [18] guarantee the global well-posedness for the problem.
Neste trabalho estudamos um resultado de boa colocação global para a equação da onda cúbica δ(_t^2)u-∆_u+U^3=0 em R_R3, no qual os dados de Cauchy estão no espaço de Sobolev Hs(R3) x Hs1(R3), para 13 18 < s < 1. A prova é baseada no rabalho de T. Roy, [23], nele é estabelecido uma lei de quase conservação de energia e a partir disso se obtém uma desigualdade que aliada a teoria da boa colocação local estabelecida por Lindbald e Sogge em [18] garante a boa colocação global para o problema.
Fino, Ahmad. "Contributions aux problèmes d'évolution." Phd thesis, Université de La Rochelle, 2010. http://tel.archives-ouvertes.fr/tel-00437141.
Full textDannawi, Ihab. "Contributions aux équations d'évolutions non locales en espace-temps." Thesis, La Rochelle, 2015. http://www.theses.fr/2015LAROS007/document.
Full textIn this thesis, we study four non-local evolution equations. The solutions of these four equations can blow up in finite time. In the theory of nonlinear evolution equations, a solution is qualified as global if it isdefined for any time. Otherwise, if a solution exists only on a bounded interval [0; T), it is called local solution. In this case and when the maximum time of existence is related to a blow up alternative, we say that the solution blows up in finite time. First, we consider the nonlinear Schröodinger equation with a fractional power of the Laplacien operator, and we get a blow up result in finite time Tmax > 0 for any non-trivial non-negative initial condition in the case of sub-critical exponent. Next, we study a damped wave equation with a space-time potential and a non-local in time non-linear term. We obtain a result of local existence of a solution in the energy space under some restrictions on the initial data, the dimension of the space and the growth of nonlinear term. Additionally, we get a blow up result of the solution in finite time for any initial condition positive on average. In addition, we study a Cauchy problem for the evolution p-Laplacien equation with nonlinear memory. We study the local existence of a solution of this equation as well as a result of non-existence of global solution. Finally, we study the maximum interval of existence of solutions of the porous medium equation with a nonlinear non-local in time term
Taggart, Robert James Mathematics & Statistics Faculty of Science UNSW. "Evolution equations and vector-valued Lp spaces: Strichartz estimates and symmetric diffusion semigroups." 2008. http://handle.unsw.edu.au/1959.4/43298.
Full textChen, Jia-Hao, and 陳家豪. "Strichartz Estimates for Schrödinger Equation and Semiclassical Limit of the Long Wave-Short Wave Interaction Equations." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/57060467953483168378.
Full text國立交通大學
應用數學系所
98
There are two parts in this paper. In part I, we discuss the Strichartz estimates on Schrödinger equation. First, we observe the restrictions on exponent pair (p,q) from the viewpoint of dimension. Then we also provide a rigid proof, and conclude that the so-called admissible pair coincides with the arguments of dimensional analysis. In part II, we study the semiclassical limit of the three coupled long wave-short wave interaction equations. First, we employ the Madelung transformation to discuss the hydrodynamical structures and the conservation laws. Then, we apply the modified Madelung transformation and energy estimates to justify the existence and uniqueness of the local classical solution. Finally, we prove the existence of the semiclassical limit of the solution.
Hsu, Yi-Cheng, and 徐義程. "Strichartz Estimate for Discrete Schrodinger Equation." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/87106837554524210879.
Full text國立臺灣大學
數學研究所
95
In this paper we show the Strichartz estimate to the discrete Schr"{o}dinger equation. The continuous Strichartz is essential for the proof of the existence of solution of nonlinear Schr"{o}dinger equation in some function space[3]. It is believed that this is also a key step to the proof of the convergence for finite difference method for nonlinear Schrodinger equation.
Hsu, Yi-Cheng. "Strichartz Estimate for Discrete Schrodinger Equation." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2506200714322700.
Full textHe, Daoyin. "Critical exponents for semilinear Tricomi-type equations." Doctoral thesis, 2016. http://hdl.handle.net/11858/00-1735-0000-002B-7CBB-0.
Full text