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Littérature scientifique sur le sujet « Almgren's function »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Almgren's function"

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De Lellis, Camillo, Matteo Focardi et Emanuele Nunzio Spadaro. « Lower semicontinuous functionals for Almgren's multiple valued functions ». Annales Academiae Scientiarum Fennicae Mathematica 36 (août 2011) : 393–410. http://dx.doi.org/10.5186/aasfm.2011.3626.

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Logaritsch, Philippe, et Andrea Marchese. « Kirszbraun’s extension theorem fails for Almgren’s multiple valued functions ». Archiv der Mathematik 102, no 5 (mai 2014) : 455–58. http://dx.doi.org/10.1007/s00013-014-0642-4.

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Brendle, Simon, et Otis Chodosh. « On the Maximum Curvature of Closed Curves in Negatively Curved Manifolds ». Canadian Mathematical Bulletin 58, no 4 (1 décembre 2015) : 713–22. http://dx.doi.org/10.4153/cmb-2015-030-3.

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AbstractMotivated by Almgren’s work on the isoperimetric inequality, we prove a sharp inequality relating the length and maximum curvature of a closed curve in a complete, simply connected manifold of sectional curvature at most −1. Moreover, if equality holds, then the norm of the geodesic curvature is constant and the torsion vanishes. The proof involves an application of the maximum principle to a function defined on pairs of points.
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LØKKA, ARNE, et JUNWEI XU. « OPTIMAL LIQUIDATION TRAJECTORIES FOR THE ALMGREN–CHRISS MODEL ». International Journal of Theoretical and Applied Finance 23, no 07 (novembre 2020) : 2050049. http://dx.doi.org/10.1142/s0219024920500491.

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We consider an optimal liquidation problem with infinite horizon in the Almgren–Chriss framework, where the unaffected asset price follows a Lévy process. The temporary price impact is described by a general function that satisfies some reasonable conditions. We consider a market agent with constant absolute risk aversion, who wants to maximize the expected utility of the cash received from the sale of the agent’s assets, and show that this problem can be reduced to a deterministic optimization problem that we are able to solve explicitly. In order to compare our results with exponential Lévy models, which provide a very good statistical fit with observed asset price data for short time horizons, we derive the (linear) Lévy process approximation of such models. In particular we derive expressions for the Lévy process approximation of the exponential variance–gamma Lévy process, and study properties of the corresponding optimal liquidation strategy. We then provide a comparison of the liquidation trajectories for reasonable parameters between the Lévy process model and the classical Almgren–Chriss model. In particular, we obtain an explicit expression for the connection between the temporary impact function for the Lévy model and the temporary impact function for the Brownian motion model (the classical Almgren–Chriss model), for which the optimal liquidation trajectories for the two models coincide.
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LIU, HAIRONG, FANG LIU et HUI WU. « THE UNIQUE CONTINUATION PROPERTY OF -HARMONIC FUNCTIONS ON THE HEISENBERG GROUP ». Bulletin of the Australian Mathematical Society 99, no 2 (12 novembre 2018) : 219–30. http://dx.doi.org/10.1017/s0004972718001016.

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We introduce an Almgren frequency function of the sub-$p$-Laplace equation on the Heisenberg group to establish a doubling estimate under the assumption that the frequency function is locally bounded. From this, we obtain some partial results on unique continuation for the sub-$p$-Laplace equation.
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Garofalo, Nicola, et Kevin Rotz. « Properties of a frequency of Almgren type for harmonic functions in Carnot groups ». Calculus of Variations and Partial Differential Equations 54, no 2 (23 avril 2015) : 2197–238. http://dx.doi.org/10.1007/s00526-015-0862-x.

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Luo, Haijun, et Zhitao Zhang. « Limit Configurations of Schrödinger Systems Versus Optimal Partition for the Principal Eigenvalue of Elliptic Systems ». Advanced Nonlinear Studies 19, no 4 (1 novembre 2019) : 693–715. http://dx.doi.org/10.1515/ans-2019-2057.

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AbstractWe study a Schrödinger system of four equations with linear coupling functions and nonlinear couplings, including the case that the corresponding elliptic operators are indefinite. For any given nonlinear coupling {\beta>0}, we first use minimizing sequences on a normalized set to obtain a minimizer, which implies the existence of positive solutions for some linear coupling constants {\mu_{\beta},\nu_{\beta}} by Lagrange multiplier rules. Then, as {\beta\to\infty}, we prove that the limit configurations to the competing system are segregated in two groups, develop a variant of Almgren’s monotonicity formula to reveal the Lipschitz continuity of the limit profiles and establish a kind of local Pohozaev identity to obtain the extremality conditions. Finally, we study the relation between the limit profiles and the optimal partition for principal eigenvalue of the elliptic system and obtain an optimal partition for principal eigenvalues of elliptic systems.
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BARGER, WESTON, et MATTHEW LORIG. « OPTIMAL LIQUIDATION UNDER STOCHASTIC PRICE IMPACT ». International Journal of Theoretical and Applied Finance 22, no 02 (mars 2019) : 1850059. http://dx.doi.org/10.1142/s0219024918500590.

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We assume a continuous-time price impact model similar to that of Almgren–Chriss but with the added assumption that the price impact parameters are stochastic processes modeled as correlated scalar Markov diffusions. In this setting, we develop trading strategies for a trader who desires to liquidate his inventory but faces price impact as a result of his trading. For a fixed trading horizon, we perform coefficient expansion on the Hamilton–Jacobi–Bellman (HJB) equation associated with the trader’s value function. The coefficient expansion yields a sequence of partial differential equations that we solve to give closed-form approximations to the value function and optimal liquidation strategy. We examine some special cases of the optimal liquidation problem and give financial interpretations of the approximate liquidation strategies in these cases. Finally, we provide numerical examples to demonstrate the effectiveness of the approximations.
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Arkæologisk Selskab, Jysk. « Anmeldelser 2012 ». Kuml 61, no 61 (31 octobre 2012) : 259–317. http://dx.doi.org/10.7146/kuml.v61i61.24497.

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Hans Andersson & Jes Wienberg (red.): Medeltiden och arkeologien. Mer än sex decennier.(Mette Svart Kristiansen)Birgit Arrhenius & Uaininn O’Meadhra (eds.): Excavations at Helgö XVIII – Conclusions and New Aspects.(Margrethe Watt)Mogens Bencard m.fl. (red.): Ribe Excavations 1970-76, Vol. 1-6.(Olaf Olsen)J. Benjamin, C. Bonsall, C. Pickard & A. Fischer: Submerged Prehistory.(Felix Riede & Peter Moe Astrup)Hans Browall: Alvastra Pålbyggnad, 1909-1930 års utgrävningar.(Rune Iversen)Aleksander Bursche: Illerup Ådal 14. Die Münzen.(Helle Horsnæs)Martin Carver & Jan Klápštĕ (eds.): The Archaeology of Medieval Europe, 2, Twelfth to Sixteenth Centuries.(Jes Wienberg)Inge Bødker Enghoff: Regionality and biotope exploitation in Danish Ertebølle and adjoining periods.(Kenneth Ritchie)Vivian Etting: The royal castles of Denmark during the 14th century - an analysis of the major royal castles with special regard to their functions and strategic importance.(Lars Meldgaard Sass Jensen)Ingo Gabriel & Torsten Kempke: Starigard/Oldenburg – Hauptburg der Slawen in Wagrien, bd. VI, Die Grabfunde. Einführung und archäologisches Material.(Silke Eisenschmidt)James Graham-Campbell, Søren M. Sindbæk og Gareth Williams (red.): Silver Economies, Monetisation and Society in Scandinavia, AD 800-1100.(Claus Feveile)Poul Grinder-Hansen: Søren Abildgaard (1718-1791). Fortiden på tegnebrættet.(Else Roesdahl)Martin Hansson, Jan Kock & Jens Vellev (red.): Renæssanceglas i Norden.(Vivi Jensen)Wilhelm Heizmann & Morten Axboe (Hrsg.): Die Goldbrakteaten der Völkerwanderungszeit – Auswertung und Neufund.(Ulla Lund Hansen)Felix Jakobson: Die Brandgräberfelder von Daumen und Kellaren im Kreise Allenstein, Ostpr.(Karen Høilund Nielsen)Volgker Hilber: Masurische Bügelfibeln. Studien zu den Fernbeziehungen der völkerwanderungszeitlichen Brandgräberfelder von Daumen und Kellaren.(Karen Høilund Nielsen)Lis Helles Olesen, Henrik Dupont & Claus Dam: Luftfotos over Danmark. Luftfotoserier i private og offentlige arkiver.(Michael Vinter)Martin Rundkvist: Mead-halls of the Eastern Geats. Elite Settlements and Political Geography AD 375-1000 in Östergötland, Sweden.(Mads Dengsø Jessen)Lothar Schulte: Die Fibeln mit hohem Nadelhalter (Almgren Gruppe VII).(Rasmus Birch Iversen)Annette Siegmüller: Die Ausgrabungen auf der frühmittelalterlichen Wurt Hessens in Wilhelmshaven.(Morten Søvsø)Katrin Struckmeyer: Die Knochen- und Geweihgeräte der Feddersen Wierde. Gebrauchsspurenanalysen an Geräten von der Römischen Kaiserzeit bis zum Mittelalter und ethno­archäologische Vergleiche.(Anna S. Beck)Karsten Vibild: Kirke i købstad. Ny historie om gammelt hus. Køge Sct. Nicolai.(Morten Larsen)
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Holck Colding, Tobias, et William P. Minicozzi II. « Parabolic Frequency on Manifolds ». International Mathematics Research Notices, 19 avril 2021. http://dx.doi.org/10.1093/imrn/rnab052.

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Abstract We prove monotonicity of a parabolic frequency on static and evolving manifolds without any curvature or other assumptions. These are parabolic analogs of Almgren’s frequency function. When the static manifold is Euclidean space and the drift operator is the Ornstein–Uhlenbeck operator, this can been seen to imply Poon’s frequency monotonicity for the ordinary heat equation. When the manifold is self-similarly evolving by the Ricci flow, we prove a parabolic frequency monotonicity for solutions of the heat equation. For the self-similarly evolving Gaussian soliton, this gives directly Poon’s monotonicity. Monotonicity of frequency is a parabolic analog of the 19th century Hadamard three-circle theorem about log convexity of holomorphic functions on C. From the monotonicity, we get parabolic unique continuation and backward uniqueness.
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Thèses sur le sujet "Almgren's function"

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NYS, MANON. « Schrödinger equations with an external magnetic field : spectral problems & ; semiclassical states ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/89252.

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In this thesis, we study Schrödinger equations with an external magnetic field. In the first part, we are interested in an eigenvalue problem. We work in an open, bounded and simply connected domain in dimension two. We consider a magnetic potential singular at one point in the domain, and related to the magnetic field being a multiple of a Dirac delta. Those two objects are related to the Bohm-Aharonov effect, in which a charged particle is influenced by the presence of the magnetic potential although it remains in a region where the magnetic field is zero. We consider the Schrödinger magnetic operator appearing in the Schrödinger equation in presence of an external magnetic field. We want to study the spectrum of this operator, and more particularly how it varies when the singular point moves in the domain. We prove some results of continuity and differentiability of the eigenvalues when the singular point moves in the domain or approaches its boundary. Finally, in case of half-integer circulation of the magnetic potential, we study some asymptotic behaviour of the eigenvalues close to their critical points. In the second part, we study nonlinear Schrödinger equations in a cylindrically setting. We are interested in the semiclassical limit of the equation. We prove the existence of a semiclassical solution concentrating on a circle. Moreover, the radius of that circle is determined by the electric potential, but also by the magnetic potential. This result is totally new with respect to the ones before, in which the concentration is driven only by the electric potential.
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Nys, Manon. « Schrödinger equations with an external magnetic field : Spectral problems and semiclassical states ». Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/216641.

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In this thesis, we study Schrödinger equations with an external magnetic field. In the first part, we are interested in an eigenvalue problem. We work in an open, bounded and simply connected domain in dimension two. We consider a magnetic potential singular at one point in the domain, and related to the magnetic field being a multiple of a Dirac delta. Those two objects are related to the Bohm-Aharonov effect, in which a charged particle is influenced by the presence of the magnetic potential although it remains in a region where the magnetic field is zero. We consider the Schrödinger magnetic operator appearing in the Schrödinger equation in presence of an external magnetic field. We want to study the spectrum of this operator, and more particularly how it varies when the singular point moves in the domain. We prove some results of continuity and differentiability of the eigenvalues when the singular point moves in the domain or approaches its boundary. Finally, in case of half-integer circulation of the magnetic potential, we study some asymptotic behaviour of the eigenvalues close to their critical points. In the second part, we study nonlinear Schrödinger equations in a cylindrically setting. We are interested in the semiclassical limit of the equation. We prove the existence of a semiclassical solution concentrating on a circle. Moreover, the radius of that circle is determined by the electric potential, but also by the magnetic potential. This result is totally new with respect to the ones before, in which the concentration is driven only by the electric potential.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
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« Multiple-valued functions in the sense of F. J. Almgren ». Université catholique de Louvain, 2008. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-05312008-222245/.

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Livres sur le sujet "Almgren's function"

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(Editor), Vladimir Scheffer, et Jean E. Taylor (Editor), dir. Almgren's Big Regularity Paper : Q-Valued Functions Minimizing Dirichlet's Integral and the Regularity of Area-Minimizing Rectifiable Currents Up to Codimension ... Scientific Monograph Series in Mathematics). World Scientific Publishing Company, 2000.

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Chapitres de livres sur le sujet "Almgren's function"

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« Approximation in Mass of a Nearly Flat Rectifiable Current Which Is Mass Minimizing in a Manifold by the Image of a Lipschitz Q(Rm+n) Valued Function Defined on a Center Manifold ». Dans Almgren's Big Regularity Paper, 331–682. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812813299_0006.

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« Basic Properties of Q and Q Valued Functions ». Dans Almgren's Big Regularity Paper, 34–90. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812813299_0003.

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« Bounds on the Frequency Functions and the Main Interior Regularity Theorem ». Dans Almgren's Big Regularity Paper, 683–836. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812813299_0007.

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« Properties of Dir Minimizing Q Valued Functions and Tangent Cone Stratification of Mass Minimizing Rectifiable Currents ». Dans Almgren's Big Regularity Paper, 91–224. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812813299_0004.

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« Approximation in Mass of Nearly Flat Rectifiable Currents Which Are Mass Minimizing in Manifolds by Graphs of Lipschitz Q Valued Functions Which Can Be Weakly Nearly Dir Minimizing ». Dans Almgren's Big Regularity Paper, 225–330. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812813299_0005.

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Actes de conférences sur le sujet "Almgren's function"

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De Lellis, Camillo. « Almgren's Q-valued Functions Revisited ». Dans Proceedings of the International Congress of Mathematicians 2010 (ICM 2010). Published by Hindustan Book Agency (HBA), India. WSPC Distribute for All Markets Except in India, 2011. http://dx.doi.org/10.1142/9789814324359_0128.

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