Relevant bibliographies by topics / Stochastic gravity

Academic literature on the topic 'Stochastic gravity'

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Published: 1 April 2023

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Journal articles on the topic "Stochastic gravity"

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Moffat, J. W. "Stochastic gravity." Physical Review D 56, no. 10 (November 15, 1997): 6264–77. http://dx.doi.org/10.1103/physrevd.56.6264.

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Ross, D. K., and William Moreau. "Stochastic gravity." General Relativity and Gravitation 27, no. 8 (August 1995): 845–58. http://dx.doi.org/10.1007/bf02113067.

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Verdaguer, E. "Stochastic gravity: beyond semiclassical gravity." Journal of Physics: Conference Series 66 (May 1, 2007): 012006. http://dx.doi.org/10.1088/1742-6596/66/1/012006.

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Erlich, Joshua. "Stochastic emergent quantum gravity." Classical and Quantum Gravity 35, no. 24 (November 19, 2018): 245005. http://dx.doi.org/10.1088/1361-6382/aaeb55.

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Rumpf, Helmut. "Stochastic Quantum Gravity inDDimensions." Progress of Theoretical Physics Supplement 111 (1993): 63–81. http://dx.doi.org/10.1143/ptps.111.63.

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Baulieu, L. "Stochastic equations for gravity." Physics Letters B 175, no. 2 (July 1986): 133–37. http://dx.doi.org/10.1016/0370-2693(86)90702-1.

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Rumpf, Helmut. "Stochastic quantization of Einstein gravity." Physical Review D 33, no. 4 (February 15, 1986): 942–52. http://dx.doi.org/10.1103/physrevd.33.942.

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Salopek, D. S., and J. R. Bond. "Stochastic inflation and nonlinear gravity." Physical Review D 43, no. 4 (February 15, 1991): 1005–31. http://dx.doi.org/10.1103/physrevd.43.1005.

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Wang, Ya Jun, and Wo Hua Zhang. "Super Gravity Dam Generalized Damage Study." Advanced Materials Research 479-481 (February 2012): 421–25. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.421.

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Fuzzy sub-space, with analysis on generalized uncertainty of damage, is setup in this paper when topological consistency of damage fuzzy and randomness on [0,1] scale being demonstrated deeply. Furthermore, deduced under fuzzy characteristics translation are three fuzzy analytical models of damage functional, namely, half depressed distribution, swing distribution, combined swing distribution, by which, fuzzy extension territory on damage evolution is formulated here. With the representation of damage variable ß probabilistic distribution as well as formulation on stochastic sub-space of damage variable, expended on the basis of extension criterion and fuzzy probability is damage model defined within generalized uncertain space, by which, introduced is fuzzy probabilistic integral algorithm of generalized uncertain damage variable that could be simulated by the forthcoming fuzzy stochastic damage constitution model based on three fuzzy functional models before. Moreover, in order to realize the joint of fuzzy input and output procedure on generalized uncertain damage variable calculation, fuzzy self-adapting stochastic damage reliability algorithm is, with the update on fuzzy stochastic finite element method within standard normal distribution probabilistic space by the help of foregoing fuzzy stochastic damage constitution model, offered in this paper on the basis of equivalent-normalization and orthogonal design theory. 3-dimension fuzzy stochastic damage mechanical status of numerical model of Longtan Rolled-Concrete Dam is researched here by fuzzy stochastic damage finite element method program under property authority. Random field parameters’ statistical dependence and non-normality are considered comprehensively in fuzzy stochastic damage model of this paper, by which, damage uncertainty’s proper development and conception expansion as well as fuzzy and randomness of mechanics are hybridized overall in fuzzy stochastic damage analysis process.
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Shushi, Tomer. "Randomness in modified general relativity theory: The stochastic f(R) gravity model." Canadian Journal of Physics 96, no. 11 (November 2018): 1173–77. http://dx.doi.org/10.1139/cjp-2017-0938.

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We consider a stochastic modification of the f(R) gravity models, and provide its important properties, including the gravity field equations for the model. We show a prediction in which particles are localized by a system of random gravitational potentials. As an important special case, we investigate a gravity model in the presence of a small stochastic space–time perturbation and provide its gravity field equations. Using the proposed model we examine the stochastic quantum mechanics interpretation, and obtain a novel Schrödinger equation with gravitational potential that is based on diffusion in a gravitational field. Furthermore, we provide a new interpretation to the wavefunction collapse. It seems that the stochastic f(R) gravity model causes decoherence of the spatial superposition state of particles.
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Dissertations / Theses on the topic "Stochastic gravity"

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Powell, Jonathan. "Stochastic modelling of atmospheric gravity waves." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/15652.

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Internal gravity waves have an important effect on the large-scale circulation of the middle atmosphere, which is conditioned by the deposition of momentum due to their breaking. The propagation of gravity waves is influenced by the properties of the background wind. This thesis examines this influence: it uses stochastic techniques to study gravity wave propagation through a randomly fluctuating background wind. It begins by describing general features of the atmosphere and gravity wave propagation. The basic equations of fluid flow within the atmosphere are derived. These lead via the WKB approximation to a dispersion relation and to ray equations for gravity wave propagation. Propagation equations, such as the ray equations and dispersion relation, are derived in a general context. The notion of a Wigner matrix is introduced, and this is used to derive transport equations for a general Hamiltonian system that may contain random components. These results generalise earlier works by Ryzhik and Guo and Wang. Atmospheric gravity waves are described as an application and the equations derived via the WKB approximation are recovered. The major factor influencing the distribution of gravity waves is the spread of their wavenumber as they propagate through a wind. This is described by the Doppler spreading model. A one-dimensional system with a randomly fluctuating background wind, dependent on altitude only, is considered. The model revisits that of Souprayen by using an Ornstein-Uhlenbeck process to describe the wind. Simple equations for the energy spectrum induced by gravity waves are derived. Analytic forms of the energy spectrum are given and features of the spectrum such as the m-3 spectral tail (where m is the vertical wavenumber), central wavenumber and scaling with the Brunt-Väisälä frequently are found to be consistent with observations. An equation for the force on the background, induced by gravity wave breaking is also derived.
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Van, Loon Jasper. "Functional and stochastic modelling of satellite gravity data /." Delft : NCG Nederlandse Commissie voor Geodesie, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=9789061323075.

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Harriss, C. A. "A comprehensive study of metal fatigue as a stochastic process in gravity die-cast LM25 aluminium and timetal 834 titanium alloys." Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637234.

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Despite the recent advances in fatigue life prediction, there remains no generic methodology for predicting with a high degree of accuracy the fatigue life and associated statistical scatter of a completely new component design. The current programme of research has generated a large number of fatigue data for a common gravity die-cast aluminium alloy (LM25), and a forged titanium alloy used typically in high-performance aerospace applications (TIMETAL834, previously known as IMI834). An extensive survey of the literature has been conducted, leading to the development of a standard formulation method for material-specific statistical lifting approaches. This methodology forms the basis for the creation of a Statistical Fatigue Analysis Package (SFAP), which has been used to analyse the fatigue data.
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Martineau, Killian. "Quelques aspects de cosmologie et de physique des trous noirs en gravitation quantique à boucles Detailed investigation of the duration of inflation in loop quantum cosmology for a Bianchi I universe with different inflaton potentials and initial conditions Some clarifications on the duration of inflation in loop quantum cosmology A first step towards the inflationary trans-Planckian problem treatment in loop quantum cosmology Scalar spectra of primordial perturbations in loop quantum cosmology Phenomenology of quantum reduced loop gravity in the isotropic cosmological sector Primordial Power Spectra from an Emergent Universe: Basic Results and Clarifications Fast radio bursts and the stochastic lifetime of black holes in quantum gravity Quantum fields in the background spacetime of a polymeric loop black hole Quasinormal modes of black holes in a toy-model for cumulative quantum gravity Seeing through the cosmological bounce: Footprints of the contracting phase and luminosity distance in bouncing models Dark matter as Planck relics without too exotic hypotheses A Status Report on the Phenomenology of Black Holes in Loop Quantum Gravity: Evaporation, Tunneling to White Holes, Dark Matter and Gravitational Waves." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY044.

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Cantonnée à la physique mathématique depuis des décennies, la gravitation quantique entre désormais dans le giron de la science expérimentale. Suivant cette mouvance nous considérons dans cette thèse trois cadres d’application de la gravitation quantique à boucles (LQG) : le système Univers, les trous noirs et les astroparticules. Le troisième n’est qu’esquissé tandis que les deux premiers sont présentés plus en détails.Le secteur cosmologique étant l’un des domaines les plus prometteurs pour tester et contraindre des théories de gravité quantique, le développement de différents modèles tentant d’appliquer les idées de la LQG à l’Univers primordial ne s’est pas fait attendre. Les travaux que nous présentons portent sur la phénoménologie associée à ces modèles; tant dans le secteur homogène (où nous nous focalisons notamment sur la durée de la phase d’inflation), que dans le secteur inhomogène (nous étudions ce coup-ci le devenir des spectres de puissance primordiaux). Ces études combinées nous permettent alors de préciser dans quelle mesure des effets de gravité quantique (à boucles) peuvent être observés dans les anisotropies du fond diffus cosmologique.D’autre part les trous noirs, non contents de faire partie des objets les plus étranges et les plus fascinants de l’Univers, constituent également des sondes privilégiées pour tester des théories de gravitation. Nous développons la phénoménologie associée à différents traitements des trous noirs en gravitation quantique à boucles. Celle-ci intervient sur une grande variété de fronts : de l’évaporation de Hawking aux ondes gravitationnelles, en passant par la matière noire. C’est sans nul doute un domaine riche et vaste.Finalement, l’existence d’une échelle de longueur minimale, prédite par la majorité des théories de gravité quantique, suggère une généralisation du principe d’incertitude de Heisenberg. Partant de ce constat nous présentons également dans ce manuscrit une méthodologie permettant de calculer une nouvelle relation de dispersion de la lumière à partir du principe d’incertitude généralisé le plus couramment répandu
After decades of being confined to mathematical physics, quantum gravity now enters the field of experimental science. Following this trend, we consider throughout this thesis three implementation frameworks of Loop Quantum Gravity (LQG): the Universe as a system, black holes and astroparticles. The last one is only outlined while the first two are presented in more detail.Since the cosmological sector is one of the most promising areas for testing and constraining quantum gravity theories, it was not long before the development of different models attempting to apply the ideas of the LQG to the primordial Universe. The work we present deals with the phenomenology associated with these models; both in the homogeneous sector (where we focus particularly on the duration of the inflation phase), as in the inhomogeneous sector (where this time, we study the fate of the primordial power spectra). These combined studies then allow us to specify to what extent effects of (loop) quantum gravity can be observed in the anisotropies of the cosmic microwave background.On the other hand black holes, not content to be among the strangest and most fascinating objects of the Universe, are also prominent probes to test the theories of gravitation. We develop the phenomenology associated with different treatments of black holes in the loop quantum gravity framework, which intervenes on multiple levels: from the evaporation of Hawking to gravitational waves, including dark matter. This is undoubtedly a rich and vast area.Finally, the existence of a minimal length scale, predicted by the majority of quantum gravity theories, suggests a generalization of the Heisenberg uncertainty principle. On the basis of this observation, we also present in this manuscript a methodology to derive a new relation dispersion of light from the most widely used generalized uncertainty principle
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Hatifi, Mohamed. "Beyond pilot wave dynamics : non-linearity and non-equilibrium in quantum mechanics." Thesis, Ecole centrale de Marseille, 2019. http://www.theses.fr/2019ECDM0006.

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La mécanique quantique a modifié notre façon d'interpréter ce que jadis l'on appelait communément "réalité physique". A titre d'exemple, selon l'interprétation standard de la mécanique quantique (dite interprétation probabiliste de Copenhague) les propriétés d’un objet quantique n'ont pas de réalité physique, du moins, pas avant que l’observateur ne les mesure. De plus, tout semble se passer comme s'il y avait un indéterminisme intrinsèque à la dynamique quantique qui ne permettrait pas de prédire avec certitude le résultat d'une mesure. Dès lors, plusieurs interprétations physiques et philosophiques ont vu naissance afin de décrire (notre connaissance de) cette réalité.C'est au cours de la conférence de Solvay en 1927 que Louis de Broglie, un opposant à l'interprétation probabiliste, proposa une solution alternative qui permettait d'une part de restaurer le déterminisme (ainsi que le réalisme) et d'autre part de remettre au premier plan la notion de trajectoire. Par la suite cette théorie fut redécouverte et complétée par David Bohm pour donner naissance à la théorie connue aujourd'hui sous l'appellation de théorie de l'onde pilote. John Bell a dit à propos de cette interprétation : " En 1952, l'impossible a été rendu possible. C'était dans l'article de David Bohm. Bohm a montré explicitement comment une description indéterministe pouvait être transformée en théorie déterministe."Les travaux présentés dans ce manuscrit de thèse s'inscrivent dans la continuité de la vision de de Broglie et consistent en deux parties, chacune d'elles ayant pour but de répondre à une problématique particulière. Dans la première, on considère deux formalismes du type onde pilote, une version déterministe (dynamique de de Broglie-Bohm chapitre 2) ainsi qu'une de ses extensions stochastiques (dynamique de Bohm-Hiley-Nelson chapitre 3). On s'attardera notamment sur l’émergence de la probabilité quantique à partir de ces dynamiques dans l’approche dite du "Quantum Non-Equilibrium". Cette approche permet entre autres de s'affranchir du statut axiomatique de la distribution de probabilité mais aussi de la justifier par des arguments similaires à ceux que l'on retrouve en mécanique statistique. Parmi ces arguments on retrouvera à titre d’exemple la notion d’ergodicité, de chaos, de mixing ainsi que d’autres propriétés qui feront l’objet d’une étude approfondie (chapitre 4). En particulier, l’émergence de l’équilibre s'accompagne d'un processus de relaxation que nous allons caractériser dans chacune de ces dynamiques (dans le chapitre 3 nous dériverons un théorème H qui décrit quantitativement ce processus dans le cas stochastique). Par ailleurs, nous nous efforcerons, dans une approche phénoménologique, d’appliquer ces théories quantiques d'onde pilote à la dynamique macroscopique des gouttes d'huile rebondissantes dans un bain (chapitre 5).La deuxième problématique quant à elle, repose sur une hypothétique généralisation non-linéaire de la mécanique quantique. En particulier, nous considérerons l'équation de Schrodinger Newton comme une première proposition a cette généralisation. Cette équation non-linéaire découle d’une approximation semi-classique de la gravité et a été entre autres proposée par Roger Penrose pour expliquer le collapse de la fonction d’onde. Nous montrerons dans un premier temps comment le programme de la double solution de Louis de Broglie se développe dans ce contexte (chapitre 6). Par la suite nous verrons comment tester cette généralisation non-linéaire par deux propositions expérimentales (chapitre 7). En particulier, l’une de ces propositions nous conduira à étudier des effets de décohérence lors du refroidissement laser (Doppler cooling, chapitre 8). Pour cela on utilisera le modèle de Ghirardi–Rimini–Weber (GRW) comme modèle de décohérence. Ce qui nous permettra par la suite de généraliser les résultats obtenus auparavant par GRW dans leur modèle
The quantum theory has modified the way we interpret what in the past was commonly called "physical reality". As an example, according to the standard interpretation of quantum mechanics (the so-called probabilistic interpretation of Copenhagen), the properties of a quantum object have no physical reality, at least not before the observer measures them. Moreover, everything seems to happen as if there was an intrinsic indeterminism in the quantum dynamics that forbids to predict with certainty the result of a measurement. From then, several physical and philosophical interpretations were born to describe (our knowledge of) this reality.It is in 1927, during the Solvay conference, that Louis de Broglie, an opponent of the probabilistic interpretation, proposed an alternative solution to that problem. He proposed on the one hand to restore determinism (as well as realism) and on the other hand to bring back the notion of trajectory to the foreground. Subsequently this theory was rediscovered and supplemented by David Bohm to give birth to the theory known today as pilot wave theory. John Bell said about this interpretation: " In 1952, I saw the impossible done. It was in papers by David Bohm. Bohm showed explicitly how .... the indeterministic description could be transformed into a deterministic one."The works carried out in this manuscript are in continuity with de Broglie’s view and can be summed up in two main parts, each of them having the aim of answering a particular problem. In the first part, we consider two versions of the pilot wave theory: a deterministic version (de Broglie-Bohm dynamics in chapter 2) as well as one of its stochastic extensions (Bohm-Hiley-Nelson dynamics in chapter 3). In the framework of what is called the "Quantum non-equilibrium" approach we shall see how the quantum probability emerges from those dynamics. This approach makes it possible to get rid of the axiomatic status of the probability distribution but also to justify it by arguments similar to those found in statistical mechanics. Among these arguments we shall for instance find ergodicity, chaos, mixing and other properties that will be studied in depth (chapter 4). In particular, the emergence of the quantum probability is accompanied by a relaxation process that will be characterized for both dynamics (in chapter 3 we derive a strong H-theorem for the stochastic dynamics which quantitatively describes how this process occurs). In addition, we will try in a phenomenological approach to apply these quantum pilot wave theories to the macroscopic dynamics of bouncing oil droplets (chapter 5).The second problem is linked to a hypothetical nonlinear generalization of the quantum theory. In particular, we considered the Schrodinger Newton equation as a first proposal to this generalization. In a nutshell, this non-linear equation derives from a semi-classical approximation of gravity and has been proposed by Roger Penrose among others to explain the collapse of the wave function. We shall first show how it is related to the double solution program of Louis de Broglie (chapter 6). Subsequently we will see how to test this nonlinear generalization by considering two experimental proposals (chapter 7). In particular, one of these proposals will lead us to study the interplay between decoherence and Doppler cooling (chapter 8). To do this we shall use the model of Ghirardi-Rimini and Weber (GRW) as a decoherence model, which will allow us to generalize their original results
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Williams, Paul David. "Nonlinear interactions of fast and slow modes in rotating, stratified fluid flows." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:5365c658-ab60-41e9-b07b-0f635909835e.

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This thesis describes a combined model and laboratory investigation of the generation and mutual interactions of fluid waves whose characteristic scales differ by an order of magnitude or more. The principal aims are to study how waves on one scale can generate waves on another, much shorter scale, and to examine the subsequent nonlinear feedback of the short waves on the long waves. The underlying motive is to better understand such interactions in rotating, stratified, planetary fluids such as atmospheres and oceans. The first part of the thesis describes a laboratory investigation using a rotating, two-layer annulus, forced by imposing a shear across the interface between the layers. A method is developed for making measurements of the two-dimensional interface height field which are very highly-resolved both in space and time. The system's linear normal modes fall into two distinct classes: 'slow' waves which are relatively long in wavelength and intrinsic period, and 'fast' waves which are much shorter and more quickly-evolving. Experiments are performed to categorize the flow at a wide range of points in the system's parameter space. At very small background rotation rates, the interface is completely devoid of waves of both types. At higher rates, fast modes only are generated, and are shown to be consistent with the Kelvin-Helmholtz instability mechanism based on a critical Richardson number. At rotation rates which are higher still, baroclinic instability gives rise to the onset of slow modes, with subsequent localized generation of fast modes superimposed in the troughs of the slow waves. In order to examine the generation mechanism of these coexisting fast modes, and to assess the extent of their impact upon the evolution of the slow modes, a quasi-geostrophic numerical model of the laboratory annulus is developed in the second part of the thesis. Fast modes are filtered out of the model by construction, as the phase space trajectory is confined to the slow manifold, but the slow wave dynamics is accurately captured. Model velocity fields are used to diagnose a number of fast wave radiation indicators. In contrast to the case of isolated fast waves, the Richardson number is a poor indicator of the generation of the coexisting fast waves that are observed in the laboratory, and so it is inferred that these are not Kelvin-Helmholtz waves. The best indicator is one associated with the spontaneous emission of inertia-gravity waves, a generalization of geostrophic adjustment radiation. A comparison is carried out between the equilibrated wavenumbers, phase speeds and amplitudes of slow waves in the laboratory (which coexist with fast modes), and slow waves in the model (which exist alone). There are significant differences between these wave properties, but it is shown that these discrepancies can be attributed to uncertainties in fluid properties, and to model approximations apart from the neglect of fast modes. The impact of the fast modes on the slow modes is therefore sufficiently small to evade illumination by this method of inquiry. As a stronger test of the interaction, a stochastic parameterization of the inertia-gravity waves is included in the model. Consistent with the laboratory/model intercomparison, the parameterized fast waves generally have only a small impact upon the slow waves. However, sufficiently close to a transition curve between two different slow modes in the system's parameter space, it is shown that the fast modes can exert a dominant influence. In particular, the fast modes can force spontaneous transitions from one slow mode to another, due to the phenomenon of stochastic resonance. This finding should be of interest to the meteorological and climate modelling communities, because of its potential to affect model reliability.
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Foudil-Bey, Nacim. "Développement d'outils d'interprétation de données géophysiques." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0142/document.

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Les méthodes géophysiques aéroportées sont très utilisées pour la prospection du sous-sol à l'échelle régionale, permettant ainsi de couvrir de grandes surfaces en particulier les zones difficiles d'accès. Le sujet de thèse concerne le développement de techniques d'interprétation des données géophysiques pour le problème des ressources naturelles et de l'environnement. La première partie de cette thèse concerne le développement d'une méthode de calcul direct des composantes des champs gravimétrique et magnétique à partir d'une structure (corps) géologique modélisé(e) par une grille à base de tétraèdres, ce qui permet de représenter des modèles géologiques très complexes particulièrement en présence de zones faillées et hétérogènes avec un nombre d'éléments optimal. Plusieurs techniques d'inversions utilisent des contraintes mathématiques pour la résolution du problème inverse en modélisation. Ces contraintes permettent de réduire le nombre de modèles possibles. Cependant les solutions proposées appelées aussi « le modèle le plus probable » présentent des solutions lisses, ce qui est loin de représenter la réalité géologique. Pour éluder ce problème, les deuxièmes et troisièmes parties de la thèse proposent des améliorations majeures du processus d'inversion par l'utilisation des méthodes géostatistiques telles que la Simulation Gaussienne Séquentielle ou la Co-Simulation dans le cas d'une inversion conjointe afin d'estimer les probabilités a posteriori des modèles simulés. La quatrième partie de ce mémoire présente une alternative à la simulation de plusieurs variables. L'apprentissage du réseau de neurones supervisé par un certain nombre de points permet d'établir une relation entre les différentes variables
In recent years with the technology developments, airborne geophysical methods (gravity, magnetic, and electromagnetic) are widely used in the natural resource exploration at the regional scale. It covers large areas particularly in the areas with difficult access. The first part of this thesis consist on the development of new forward modeling algorithm for the calculation of the components of the gravity and magnetic fields based on a tetrahedron grid. The tetrahedral mesh allows the representation of very complex geological models holding many heterogeneous and faulted zones with an optimal number of elements, this reduces significantly the time calculation. Several inversion techniques use mathematical constraints for the resolution of the inverse problem in order to reduce the number of possible models. However the proposed solutions called also "the most probable model" provide a smooth solutions that cannot represent the geological reality. To circumvent this problem in the second and the third parts of this thesis, we made two major improvements. The first, we integrate Sequential Gaussian Simulation into the inversion procedure to determine a possible distributions of a single property. The second is that we used the Co-Simulation in the case of joint inversion to estimate a posteriori probabilities of the simulated models. The last part of this thesis presents an alternative to the several variables simulation, supervised learning of neural networks allows to establish a relationship between the different variables
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Lenormand, Maxime. "Initialiser et calibrer un modèle de microsimulation dynamique stochastique : application au modèle SimVillages." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00822114.

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Le but de cette thèse est de développer des outils statistiques permettant d'initialiser et de calibrer les modèles de microsimulation dynamique stochastique, en partant de l'exemple du modèle SimVillages (développé dans le cadre du projet Européen PRIMA). Ce modèle couple des dynamiques démographiques et économiques appliquées à une population de municipalités rurales. Chaque individu de la population, représenté explicitement dans un ménage au sein d'une commune, travaille éventuellement dans une autre, et possède sa propre trajectoire de vie. Ainsi, le modèle inclut-il des dynamiques de choix de vie, d'étude, de carrière, d'union, de naissance, de divorce, de migration et de décès. Nous avons développé, implémenté et testé les modèles et méthodes suivants : 1 / un modèle permettant de générer une population synthétique à partir de données agrégées, où chaque individu est membre d'un ménage, vit dans une commune et possède un statut au regard de l'emploi. Cette population synthétique est l'état initial du modèle. 2 / un modèle permettant de simuler une table d'origine-destination des déplacements domicile-travail à partir de données agrégées. 3 / un modèle permettant d'estimer le nombre d'emplois dans les services de proximité dans une commune donnée en fonction de son nombre d'habitants et de son voisinage en termes de service. 4 / une méthode de calibration des paramètres inconnus du modèle SimVillages de manière à satisfaire un ensemble de critères d'erreurs définis sur des sources de données hétérogènes. Cette méthode est fondée sur un nouvel algorithme d'échantillonnage séquentiel de type Approximate Bayesian Computation.
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Sia, Sheng-Cong, and 謝成聰. "Estimating Non-Tariff Barriers on International Fresh Apple Trade: An Application of Stochastic Frontier Gravity Model." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/vvr6bm.

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碩士
國立臺灣大學
農業經濟學研究所
104
This thesis evaluates the impact of non-tariff barriers on the trade of fresh apples using a stochastic frontier specification of the gravity model. The empirical analysis is based on the transactions between twenty major fresh apple trading countries during the period 2001 to 2013. The estimation results suggest that trade flows of fresh apple are mainly affected by total productions of exporter countries, GDP per capita of importer countries, populations in importer countries, and signing status of FTAs. The stochastic frontier gravity model allows us to identify the efficiency of fresh apple trades of each country. The value of trade efficiency determines the deviation of actual trade from the frontier estimated. The average export and import efficiency of fresh apples are 9.27% and 8.80%, respectively, which are considered to be ineffective. This result suggests that non-tariff barriers are taken an important role in trade restrictions of fresh apple. Furthermore, average values of export and import efficiency of fresh apples for developed countries are 10.72% and 9.45%, respectively. But developing countries only contain 6.57% of export efficiency and 7.59% of import efficiency. This indicates that the impact of non-tariff barriers on developing countries is greater than on developed countries. In addition, fresh apple trade of each country has suffered varying extent of influence from non-tariff barriers. For example, the average import efficiency of United Arab Emirates is 23.83% but it’s only 0.18% in Argentina. This may due to the measurement criterions of non-tariff barriers are different among each country. Thus for sustainable development in agricultural trade, further integration and developing uniform standards for non-tariff barriers should be considered.
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Tung, Chia-Wen, and 董珈汶. "The application of Gravity-type Interactive Markov Chain to Solve Stochastic User equribrium problem in a network." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/64820329209323694300.

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Abstract:
碩士
國立交通大學
交通運輸研究所
86
The Gravity-type Interactive Markov models(GIM models) were introduced by Smith and Hsieh in 1994,in which migration flows in each time period are postulated to vary directly with some population-dependent measure of attractiveness and inversely with some symmetric measure of migration costs. From the viewpoint of theoretical analysis, the choice behavior of individuals inGIM models is similar to that of drivers in selecting routes in logit-based stochastic traffic assignment problems. This study is trying to formulate the GIM model of the stochastic traffic assignment in a road network. The followings will be the goal of this study: (1). Prove that the steady-state conditions of the GIM model is equivalent to the stochastic user equilibrium (SUE) conditions of the problems.(2).Develop a new algorithm for solving the SUE of the problems.(3).Compare the GIM algorithm with exiting algorithm, e.g. Frank-Wolfe method, MSA.(4).Analyze the convergence to the SUE of the GIM algorithm. This method has implemented by Mathmatica. The computation of different algorithms on different examples shows that the adjustment ratio have a great influence on the speed of convergence. And the level of overlapping in the network is slight, we can solve the stochastic user equilibrium problems that haveoverlapping links in the network by GIM algorithm.
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Books on the topic "Stochastic gravity"

1

Loon, Jasper Van. Functional and stochastic modelling of satellite gravity data. Delft: NCG, Nederlandse Commissie voor Geodesie, 2008.

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2

Morozov, A. N. Neobratimye prot͡s︡essy i brounovskoe dvizhenie: Fiziko-tekhnicheskie problemy. Moskva: Izd-vo MGTU im. N.Ė. Baumana, 1997.

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Lafontaine, Jean de. Orbital dynamics in a stochastic atmosphere and a nonspherical gravity field. [Downsivew, Ont.]: [Institute for Aerospace Studies], 1986.

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NATO Advanced Research Workshop on Probabilistic Methods in Quantum Field Theory and Quantum Gravity (1989 Cargèse, France). Probabilistic methods in quantum field theory and quantum gravity. New York: Plenum Press, 1990.

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Gwynne, Ewain. Percolation on uniform quadrangulations and SLE6 on √8/3-Liouville quantum gravity. Paris: Société mathématique de France, 2021.

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Developments in spectral stochastic techniques for gravity field modelling. Oxford: Pergamon, 1998.

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Hu, Bei-Lok B., and Enric Verdaguer. Semiclassical and Stochastic Gravity: Quantum Field Effects on Curved Spacetime. University of Cambridge ESOL Examinations, 2020.

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Hu, Bei-Lok B., and Enric Verdaguer. Semiclassical and Stochastic Gravity: Quantum Field Effects on Curved Spacetime. Cambridge University Press, 2020.

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Hu, Bei-Lok B., and Enric Verdaguer. Semiclassical and Stochastic Gravity: Quantum Field Effects on Curved Spacetime. Cambridge University Press, 2020.

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Joseph Roger Jean De Lafontaine. Orbital dynamics in a stochastic atmosphere and a nonspherical gravity field. 1987.

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Book chapters on the topic "Stochastic gravity"

1

Prugovečki, Eduard. "Geometro-Stochastic Quantum Gravity." In Quantum Geometry, 337–432. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-7971-1_11.

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Baulieu, Laurent. "On Gauge Invariances in Stochastic Quantization." In Random Surfaces and Quantum Gravity, 337–46. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3772-4_22.

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Sanchez-Gomez, José L. "Macroscopic Decoherence and Classical Stochastic Gravity." In Fundamental Problems in Quantum Physics, 291–97. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8529-3_28.

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Jona-Lasinio, G. "Some mathematical aspects of stochastic quantization." In Field Theory, Quantum Gravity and Strings, 127–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/3-540-16452-9_7.

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Zessin, H. "Stochastic Geometry and Quantum Gravity: Some Rigorous Results." In New Paths Towards Quantum Gravity, 313–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11897-5_6.

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Dermanis, Athanasios. "Establishing Global Reference Frames. Nonlinear, Temporal, Geophysical and Stochastic Aspects." In Gravity, Geoid and Geodynamics 2000, 35–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04827-6_6.

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Starobinsky, A. A. "Stochastic de sitter (inflationary) stage in the early universe." In Field Theory, Quantum Gravity and Strings, 107–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/3-540-16452-9_6.

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Kennedy, A. D. "The Theory of Hybrid Stochastic Algorithms." In Probabilistic Methods in Quantum Field Theory and Quantum Gravity, 209–23. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3784-7_14.

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Baulieu, Laurent. "On Gauge Invariances in Stochastic Quantization." In Probabilistic Methods in Quantum Field Theory and Quantum Gravity, 287–94. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3784-7_21.

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Niel, J. C. "Critical Dynamics, Stochastic Quantization and Supersymmetry." In Probabilistic Methods in Quantum Field Theory and Quantum Gravity, 295–98. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3784-7_22.

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Conference papers on the topic "Stochastic gravity"

1

Cho, Gihyuk, Cook Hyun Kim, and Hiroyuki Kitamoto. "Stochastic Dynamics of Infrared Fluctuations in Accelerating Universe." In Second LeCosPA International Symposium: Everything about Gravity. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813203952_0018.

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Shamsipour, Pejman, Ernst Schetselaar, Michel Chouteau, and Denis Marcotte. "3D STOCHASTIC GRAVITY INVERSION ON UNSTRUCTURED MESHES." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014. Society of Exploration Geophysicists and Environment and Engineering Geophysical Society, 2014. http://dx.doi.org/10.4133/sageep.27-075.

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Shamsipour, Pejman, Ernst Schetselaar, Michel Chouteau, and Denis Marcotte. "3D STOCHASTIC GRAVITY INVERSION ON UNSTRUCTURED MESHES." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014. Society of Exploration Geophysicists and Environment and Engineering Geophysical Society, 2014. http://dx.doi.org/10.1190/sageep.27-075.

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Lavenda, B. H. "Stochastic Electrodynamics: A Road to Quantum Gravity." In 101st WE-Heraeus-Seminar. WORLD SCIENTIFIC, 1993. http://dx.doi.org/10.1142/9789814503648_0024.

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Geng*, Meixia, Danian Huang, Ping Yu, and Qingjie Yang. "3D stochastic joint inversion of borehole gravity and gravity gradient data using cokriging." In SEG Technical Program Expanded Abstracts 2014. Society of Exploration Geophysicists, 2014. http://dx.doi.org/10.1190/segam2014-0183.1.

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Fukuma, Masafumi, and Nobuyuki Matsumoto. "Emergent quantum geometry from stochastic random matrices." In Corfu Summer Institute 2019 "School and Workshops on Elementary Particle Physics and Gravity". Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.376.0180.

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Grishchenko, A. D. "Chaos due to the interaction of capillary and gravity waves on the surface of deep water." In Applied nonlinear dynamics and stochastic systems near the millenium. AIP, 1997. http://dx.doi.org/10.1063/1.54213.

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Giraud, J., H. Seillé, G. Visser, V. Ogarko, M. Lindsay, and M. Jessell. "Utilisation of stochastic MT inversion results to constrain gravity inversion." In 82nd EAGE Annual Conference & Exhibition. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202113105.

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Geng, M. X., D. N. Huang, and Q. J. Yang. "3D Stochastic Inversion of Full-tensor Gravity Gradiometry Data Using Cokriging." In 76th EAGE Conference and Exhibition 2014. Netherlands: EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2214-4609.20141554.

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Shamsipour, P., M. Chouteau, D. Marcotte, and P. Keating. "3D stochastic inversion of borehole and surface gravity data using Geostatistics." In EGM 2010 International Workshop. European Association of Geoscientists & Engineers, 2010. http://dx.doi.org/10.3997/2214-4609-pdb.165.c_op_06.

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Reports on the topic "Stochastic gravity"

1

Shamsipour, P., M. Chouteau, P. Keating, and D. Marcotte. Three-dimensional stochastic inversion of gravity data: application to gravity data from the Matagami region, Quebec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2010. http://dx.doi.org/10.4095/286079.

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