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Search Results: 1 - 10 of 101 matches for " Valia Allori "
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On the Classical Limit of Quantum Mechanics
Valia Allori,Nino Zanghì
Physics , 2001,
Abstract: Contrary to the widespread belief, the problem of the emergence of classical mechanics from quantum mechanics is still open. In spite of many results on the $\h \to 0$ asymptotics, it is not yet clear how to explain within standard quantum mechanics the classical motion of macroscopic bodies. In this paper we shall analyze special cases of classical behavior in the framework of a precise formulation of quantum mechanics, Bohmian mechanics, which contains in its own structure the possibility of describing real objects in an observer-independent way.
What is Bohmian Mechanics
Valia Allori,Nino Zanghì
Physics , 2001,
Abstract: Bohmian mechanics is a quantum theory with a clear ontology. To make clear what we mean by this, we shall proceed by recalling first what are the problems of quantum mechanics. We shall then briefly sketch the basics of Bohmian mechanics and indicate how Bohmian mechanics solves these problems and clarifies the status and the role of of the quantum formalism.
Seven Steps Towards the Classical World
Valia Allori,Detlef Dürr,Shelly Goldstein,Nino Zanghí
Physics , 2001, DOI: 10.1088/1464-4266/4/4/344
Abstract: Classical physics is about real objects, like apples falling from trees, whose motion is governed by Newtonian laws. In standard Quantum Mechanics only the wave function or the results of measurements exist, and to answer the question of how the classical world can be part of the quantum world is a rather formidable task. However, this is not the case for Bohmian mechanics, which, like classical mechanics, is a theory about real objects. In Bohmian terms, the problem of the classical limit becomes very simple: when do the Bohmian trajectories look Newtonian?
Many-Worlds and Schroedinger's First Quantum Theory
Valia Allori,Sheldon Goldstein,Roderich Tumulka,Nino Zanghi
Physics , 2009,
Abstract: Schroedinger's first proposal for the interpretation of quantum mechanics was based on a postulate relating the wave function on configuration space to charge density in physical space. Schroedinger apparently later thought that his proposal was empirically wrong. We argue here that this is not the case, at least for a very similar proposal with charge density replaced by mass density. We argue that when analyzed carefully this theory is seen to be an empirically adequate many-worlds theory and not an empirically inadequate theory describing a single world. Moreover, this formulation--Schroedinger's first quantum theory--can be regarded as a formulation of the many-worlds view of quantum mechanics that is ontologically clearer than Everett's.
On the Common Structure of Bohmian Mechanics and the Ghirardi-Rimini-Weber Theory
Valia Allori,Sheldon Goldstein,Roderich Tumulka,Nino Zanghi
Physics , 2006, DOI: 10.1093/bjps/axn012
Abstract: Bohmian mechanics and the Ghirardi-Rimini-Weber theory provide opposite resolutions of the quantum measurement problem: the former postulates additional variables (the particle positions) besides the wave function, whereas the latter implements spontaneous collapses of the wave function by a nonlinear and stochastic modification of Schr\"odinger's equation. Still, both theories, when understood appropriately, share the following structure: They are ultimately not about wave functions but about ``matter'' moving in space, represented by either particle trajectories, fields on space-time, or a discrete set of space-time points. The role of the wave function then is to govern the motion of the matter.
‘Electricity is running through my veins’: Die Symbiose zwischen Mensch und Technologie in Marshall McLuhan’s Medientheorie
Valia Kraleva
HTS Theological Studies/Teologiese Studies , 2009, DOI: 10.4102/hts.v65i1.312
Abstract: ‘Electricity is running through my veins’: the symbiosis between humankind and technology in Marshall McLuhan’s media theory In contrast to a widespread technical-mathematical media model that reduces electronic media to transmission channels, thereby making information into a quantifi able commodity, Canadian media theorist Marshall McLuhan, as early as the 1960s and 1970s, revealed the complex nature of the media irrespective of the contents that it conveyed. According to McLuhan, the media is an extension of the human body that expands human agency, but nevertheless leads to the ‘amputation’ of extended body parts. In this way, the medium becomes a constituent part of the body, while thereby taking on human qualities. Following McLuhan’s media theory, this article reveals the symbiosis between technology and the human body and emphasises the signifi cance of the artist for comprehending contemporary medial-technological reality and for overcoming the challenges that such a reality poses. How to cite this article: Kravela, V., 2009, ‘”Electricity is running through my veins”: Die Symbiose zwischen Mensch und Technologie in Marshall McLuhans Medienstheorie’, HTS Teologiese Studies/Theological Studies 65(1), Art. #312, 4 pages. DOI: 10.4102/hts.v65i1.312
R misch-katholische Kirche und mediale Kommunikation
Valia Kraleva
HTS Theological Studies/Teologiese Studies , 2010, DOI: 10.4102/hts.v66i1.814
Abstract: Since the world today is so significantly shaped by media technologies, it has become crucial for organizations, institutions and political parties to embrace this phenomenon in order for them to be able to communicate their message and programmes effectively. If they fail to do so, they in effect fail to exist in the public consciousness. Mass media hugely influence how culture is created: intelligence, artistic talent and technological innovation become visible through the media. The Roman Catholic Church, the world’s largest religious organization has, for the longest time, on the one hand denied the influence of the media, while on the other hand calling it ‘the work of evil’. When the Church eventually came to acknowledge the media as a powerful force, it proceeded to use this power as a mouthpiece for its authorities. The Catholic Church is still not wholly at ease with the media. The question is whether the Catholic Church has sufficiently familiarized itself with how the media function, in order to utilise the media to communicate the Church’s message to a large public audience. Against the background of ecclesial documents this article investigates the attitude of the Catholic Church towards the media as it has developed over the past 50 years. How to cite this article: Kraleva, V., 2010, ‘R misch-katholische Kirche und mediale Kommunikation’, HTS Teologiese Studies/Theological Studies 66(1), Art. #814, 10 pages. DOI: 10.4102/hts.v66i1.814
Non-compliance in dermatologic diseases
Valia R
Indian Journal of Dermatology, Venereology and Leprology , 2008,
Abstract:
Obituary - Dr. A. C. Parikh
Valia R
Indian Journal of Dermatology, Venereology and Leprology , 2008,
Abstract:
Recent advances in dermatology
Valia R
Indian Journal of Dermatology, Venereology and Leprology , 2004,
Abstract:
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