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Relevant bibliographies by topics / Quantum Collapse / Dissertations / Theses

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Dissertations / Theses on the topic 'Quantum Collapse'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Dove, Christopher John. "Explicit wavefunction collapse and quantum measurement." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5187/.

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In this thesis, we are concerned with models of explicit wavefunction collapse as a possible solution to the measurement problem of quantum mechanics. We examine the models where collapse is to near-position eigenstates, originally introduced by Ghirardi, Rimini and Weber in 1986, where the wavefunction is spontaneously localized at random times. Subsequent models where some of the problems of the GRW model are solved, are discussed, for both sudden localization and continuous localization processes. We comment briefly on the possible origins of collapse. The consequences of possible wavefunct

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2

Constan, Lea. "On Collapse." Thesis, Konstfack, Textil, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-7802.

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This project is an active exploration of subjectivities through the medium of weaving. In a narrative illustrated with woven works, the emotional trajectory of this person of mixed cultural background through Swedish society is described. First, the work is contextualized in terms of the larger politico-cultural-discursive context, entitled the outside. It is then positioned in terms of the individual context, the inside, largely dramatized as the developments in the art of western tapestry in the past century. This culminates in the final works, three of which are presented in the final exhib

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3

Hemmo, Meir. "Quantum mechanics without collapse : modal interpretations, histories and many worlds." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/251601.

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4

CARLESSO, MATTEO. "Open Quantum System dynamics: Applications to Decoherence and Collapse models." Doctoral thesis, Università degli Studi di Trieste, 2018. http://hdl.handle.net/11368/2917550.

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Quantum mechanics exhibits a broad collection of theoretical results in complete agreement with experimental evidence. Besides showing unquestionable success in the description of isolated systems, it can be also successfully used to characterize non-isolated quantum system. In such a case, phenomena like dissipation, diffusion or decoherence. The theory of open quantum systems provides the framework where such features can be conveniently explained. This thesis is about decoherence and collapse models. Albeit conceptually they are very far from each other, they both belong the framework of o

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5

Ambrus, Marcel. "How long does it take until a quantum system reemerges after gravitational collapse? /." [S.l.] : [s.n.], 2004. http://www.zb.unibe.ch/download/eldiss/04ambrus_m.pdf.

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6

TOROŠ, MARKO. "Constraints on the spontaneous collapse mechanism: theory and experiments." Doctoral thesis, Università degli Studi di Trieste, 2017. http://hdl.handle.net/11368/2908108.

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Quantum mechanics, with the usual orthodox interpretation, leads to the problem of macroscopic linear superpositions: to avoid them the wave-function collapse postulate was introduced, forcing an arbitrary distinction between the microscopic (the system) and the macroscopic (the measurement apparatus). To resolve this issue, spontaneous collapse models suggest to combine the Schrödinger evolution with the wave-function collapse in a single dynamical law: in the microscopic regime we reobtain the predictions of quantum mechanics, within experimental errors, while for macroscopic objects we obta

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7

JONES, CAITLIN ISOBEL. "Special Relativity and Spontaneous Collapse Models." Doctoral thesis, Università degli Studi di Trieste, 2021. http://hdl.handle.net/11368/2995656.

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The work of this PhD investigates spontaneous collapse models, which are a proposed modification of quantum mechanics and their consistency with special relativity. Since soon after they were first proposed there have been many attempts to construct a relativistic collapse model, but currently there is not a satisfactory model. This thesis considers what it means for an irreversible dynamics to be consistent with special relativity and reviews the existing proposals and their issues. The key results are a demonstration of why a relativistic point-like collapse model is not possible and that

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8

Reyes, Juan Daniel Bojowald Martin. "Spherically symmetric loop quantum gravity connections to two-dimensional models and applications to gravitational collapse /." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-4758/index.html.

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9

GAONA, REYES JOSE LUIS. "Revisiting Gravity and Cosmology through Quantum continuous measurements." Doctoral thesis, Università degli Studi di Trieste, 2021. http://hdl.handle.net/11368/2981627.

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We review two models implementing Newtonian gravity through a continuous measurement and feedback mechanism. These are the Kafri-Taylor-Milburn (KTM) and the Tilloy-Diósi (TD) models. We compare the KTM and the TD models in an appropriate limit and explicitly show that the associated decoherence effects are different. We propose a classification of models which implement gravity through a continuous measurement and feedback mechanism based on two main criteria: the type of observable measured and the type of interaction implemented through the feedback. We argue that within these scenarios, th

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10

BILARDELLO, MARCO MARIA. "Heating effects and localization mechanism in cold Bose gases." Doctoral thesis, Università degli Studi di Trieste, 2017. http://hdl.handle.net/11368/2908106.

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Collapse models solve the measurement problem by adding non-linear and stochastic terms to the usual Schroedinger dynamics. The resulting dynamics localizes in position macroscopic systems, while preserves quantum mechanical predictions for microscopic systems. Two of the main consequences of this resulting dynamics are: the loss of any initial spatial coherence, with a decoherence rate which increases with the dimensions of the system (amplification mechanism); and a heating effect induced on the system that, for long times, leads either to a divergent or to a convergent value of the energy,

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11

ANTONELLI, Riccardo. "Black Objects without a Vacuum." Doctoral thesis, Scuola Normale Superiore, 2020. http://hdl.handle.net/11384/95124.

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We explore the behavior of gravitational solitons in classical theories with pathological vacua. We first focus on non-tachyonic non-supersymmetric string theories and the construction of brane solutions in the corresponding effective theories, which do not admit a maximally-symmetric vacuum. We then turn to metastable vacua and the holographic interpretation of the vacuum bubbles that may be produced therein by quantum tunneling. Finally, we discuss self-similar collapse solutions, with an eye to analogies with the settings considered in the preceding chapters.

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12

Vernier, Eric. "Non compact conformal field theories in statistical mechanics." Thesis, Paris, Ecole normale supérieure, 2015. http://www.theses.fr/2015ENSU0005/document.

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Les comportements critiques des systèmes de mécanique statistique en 2 dimensions ou de mécanique quantique en 1+1 dimensions, ainsi que certains aspects des systèmes sans interactions en 2+1 dimensions, sont efficacement décrits par les méthodes de la théorie des champs conforme et de l'intégrabilité, dont le développement a été spectaculaire au cours des 40 dernières années. Plusieurs problèmes résistent cependant toujours à une compréhension exacte, parmi lesquels celui de la transition entre plateaux dans l'Effet Hall Quantique Entier. La raison principale en est que de tels problèmes sont

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13

Hapiuk, Dimitri. "ZnO nanostructuré : étude expérimentale de l'auto-organisation de nanoparticules et simulations numériques du dopage dans des phases expansées." Phd thesis, Université Claude Bernard - Lyon I, 2013. http://tel.archives-ouvertes.fr/tel-01062915.

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Cette thèse avait pour premier objectif de comprendre les mécanismes d'auto-organisation entre nanoparticules de ZnO. Synthétisées via une technique physique combinant ablation laser et détente supersonique (la LECBD), les nanoparticules obtenues sont stoechiométriques, cristallisées et sans ligand. Grâce à la DRX et HRTEM, nous avons pu identifier la nature du mécanisme régissant le collage orienté des nanoparticules. Son impact sur la luminescence de couches minces de ZnO est de première importance pour des applications opto-électroniques. La microscopie confocale nous a permis de caractéris

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14

Lamponi, Marco. "Lasers inp sur circuits silicium pour applications en telecommunications." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00769402.

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La photonique du silicium a connu un développent massif pendant les dix derniers années. Presque toutes les briques technologiques de base ont été réalisées et ont démontrées des performances remarquables. Cependant, le manque d'une source laser intégrée en silicium a conduit les chercheurs à développer de composants basés sur l'intégration entre le silicium et les matériaux III-V.Dans cette thèse je décris la conception, la fabrication et la caractérisation des lasers hybrides III-V sur silicium basés sur cette intégration. Je propose un coupleur adiabatique qui permet de transférer intégrale

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15

Noble, Scott Charles. "A numerical study of relativistic fluid collapse." Thesis, 2003. http://hdl.handle.net/2152/817.

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16

Noble, Scott Charles Morrison Philip J. Choptuik Matthew William. "A numerical study of relativistic fluid collapse." 2003. http://wwwlib.umi.com/cr/utexas/fullcit?p3122773.

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17

"Is Quantum Decoherence Reality or Appearance?" ESI preprints, 2001. ftp://ftp.esi.ac.at/pub/Preprints/esi1041.ps.

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18

Abdullaev, Jasur. "Nonlinear localization, controlled transport and collapse suppression in Bose-Einstein condensates." Phd thesis, 2014. http://hdl.handle.net/1885/150449.

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This thesis includes theoretical studies regarding stability and manipulation of Bose-Einstein condensates (BECs) of ultra-cold atoms in 2D trapping geometry, as well as formation of steady states of exciton-polariton Bose-Einstein condensates created in solid states. We analyze and numerically model the dynamics and localization of the condensates using mean-field model. Chapter 1 contains an introduction to the physics of ultra-cold atom BEC and excitonpolariton BEC which provides a framework for the work presented in later chapters. In Chapter 2, we consider a method for achieving dynamical

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19

Kim, Dongil. "On von Neumann's hypothesis of collapse of the wave function and quantum Zeno paradox in continuous measurement." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-2979.

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The experiment performed by Itano, Heinzen, Bollinger and Wineland on the quantum Zeno effect is analyzed in detail through a quantum map derived by conventional quantum mechanics based on the Schrodinger equation. The analysis shows that a slight modification of their experiment leads to a significantly different result from the one that is predicted through von Neumann's hypothesis of collapse of the wave function in the quantum measurement theory. This may offer a possibility of an experimental test of von Neumann's quantum measurement theory.<br>text

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