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Osvaldo Pessoa Jr [12]Osvaldo Pessoa [7]Osvaldo Frota Pessoa [1]Osvaldo Frota Pessoa Jr [1]
  1. Can the Decoherence Approach Help to Solve the Measurement Problem?Osvaldo Pessoa - 1997 - Synthese 113 (3):323-346.
    This work examines whether the environmentally-induced decoherence approach in quantum mechanics brings us any closer to solving the measurement problem, and whether it contributes to the elimination of subjectivism in quantum theory. A distinction is made between ,collapse, and ,decoherence,, so that an explanation for decoherence does not imply an explanation for collapse. After an overview of the measurement problem and of the open-systems paradigm, we argue that taking a partial trace is equivalent to applying the projection postulate. A criticism (...)
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  2.  34
    The Tausk Controversy on the Foundations of Quantum Mechanics: Physics, Philosophy, and Politics.Osvaldo Pessoa Jr, Olival Freire Jr & Alexis de Greiff - unknown
    In 1966 the Brazilian physicist Klaus Tausk (b. 1927) circulated a preprint from the International Centre for Theoretical Physics in Trieste, Italy, criticizing Adriana Daneri, Angelo Loinger, and Giovanni Maria Prosperi`s theory of 1962 on the measurement problem in quantum mechanics. A heated controversy ensued between two opposing camps within the orthodox interpretation of quantum theory, represented by Leon Rosenfeld and Eugene P. Wigner. The controversy went well beyond the strictly scientific issues, however, reflecting philosophical and political commitments within the (...)
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  3.  33
    Counterfactual Histories: The Beginning of Quantum Physics.Osvaldo Pessoa - 2001 - Philosophy of Science 68 (3):S519 - S530.
    This paper presents a method for investigating counterfactual histories of science. A central notion to our theory of science are "advances" (ideas, data, etc.), which are units passed among scientists and which would be conserved in passing from one possible history to another. Advances are connected to each other by nets of causal influence, and we distinguish strong and weak influences. Around sixty types of advances are grouped into ten classes. As our case study, we examine the beginning of the (...)
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  4.  17
    Causal Models in the History of Science.Osvaldo Pessoa Jr - 2005 - Croatian Journal of Philosophy 5 (14):263-274.
    The investigation of a method for postulating counterfactual histories of science has led to the development of a theory of science based on general units of knowledge, which are called “advances”. Advances are passed on from scientist to scientist, and may be seen as “causing” the appearance of other advances. This results in networks which may be analyzed in terms of probabilistic causal models, which are readily encodable in computer language. The probability for a set of advances to give rise (...)
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  5.  36
    Counterfactual Histories: The Beginning of Quantum Physics.Osvaldo Pessoa Jr - 2001 - Proceedings of the Philosophy of Science Association 2001 (3):S519-.
    This paper presents a method for investigating counterfactual histories of science. A central notion to our theory of science are "advances" , which are units passed among scientists and which would be conserved in passing from one possible history to another. Advances are connected to each other by nets of causal influence, and we distinguish strong and weak influences. Around sixty types of advances are grouped into ten classes. As our case study, we examine the beginning of the Old Quantum (...)
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  6.  6
    Counterfactual Histories: The Beginning of Quantum Physics.Osvaldo Pessoa - 2001 - Philosophy of Science 68 (S3):S519-S530.
    This paper presents a method for investigating counterfactual histories of science. A central notion to our theory of science are “advances”, which are units passed among scientists and which would be conserved in passing from one possible history to another. Advances are connected to each other by nets of causal influence, and we distinguish strong and weak influences. Around sixty types of advances are grouped into ten classes. As our case study, we examine the beginning of the Old Quantum Theory, (...)
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  7.  24
    Computation of Probabilities in Causal Models of History of Science.Osvaldo Pessoa Jr - 2006 - Principia: An International Journal of Epistemology 10 (2):109-124.
    The aim of this paper is to investigate the ascription of probabilities in a causal model of an episode in the history of science. The aim of such a quantitative approach is to allow the implementation of the causal model in a computer, to run simulations. As an example, we look at the beginning of the science of magnetism, “explaining” — in a probabilistic way, in terms of a single causal model — why the field advanced in China but not (...)
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  8.  10
    Eventos Qu'nticos E Reducionismo Causal.Osvaldo Pessoa Jr - 2013 - Principia: An International Journal of Epistemology 17 (3):365.
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  9. How to measure a quale.Osvaldo Frota Pessoa Jr - 2019 - Sofia 8 (1):187-198.
    According to the colored-brain thesis, sense data or qualia are real physical-chemical qualities, located inside the brain, possibly at a specific locus. Our hypothesis is that the seats of phenomenal consciousness have a structure and a materiality. According to the proposed view, a chromatic quale emerges when a certain pixel of the visual sensorium is fed with a certain pattern Σ of spikes; a change in this pattern quickly changes the color that is subjectively generated. How could one manage to (...)
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  10.  17
    Computing Possible Worlds in the History of Modern Astronomy.Osvaldo Pessoa Jr, Rafaela Gesing, Mariana Jó de Souza & Daniel Carlos de Melo Marcílio - 2016 - Principia: An International Journal of Epistemology 20 (1):117-126.
    As part of an ongoing study of causal models in the history of science, a counterfactual scenario in the history of modern astronomy is explored with the aid of computer simulations. After the definition of “linking advance”, a possible world involving technological antecedence is described, branching out in 1510, in which the telescope is invented 70 years before its actual construction, at the time in which Fracastoro actually built the first prototelescope. By using the principle of the closest possible world, (...)
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  11. Erwin Schrödinger E o Princípio de Mach.A. K. Assis & Osvaldo Pessoa Jr - 2001 - Cadernos de História E Filosofia da Ciência 11 (2).
    Apresentamos os conceitos de inércia, espaço e tempo na mecânica newtoniana. Analisamos o princípio de Mach, segundo o qual a inércia de qualquer corpo é devida a sua interação com os corpos distantes do universo. Em seguida explicamos porque, em geral, a teoria da gravitação de Einstein não implementa este princípio. Discutimos então o trabalho de Erwin Schrödinger que apresenta uma formulação alternativa para a mecânica baseada numa lei de Weber para a gravitação e que é compatível com as idéias (...)
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  12. Bell's Theorem And The Counterfactual Definition Of Locality.Osvaldo Pessoa Jr - 2010 - Manuscrito 33 (1):351-363.
    This paper proposes a solution to the problem of non-locality associated with Bell’s theorem, within the counterfactual approach to the problem. Our proposal is that a counterfactual definition of locality can be maintained, if a subsidiary hypothesis be rejected, “locality involving two counterfactuals”. This amounts to the acceptance of locality in the actual world, and a denial that locality is always valid in counterfactual worlds. This also introduces a metaphysical asymmetry between the factual and counterfactual worlds. This distinction is analogous (...)
     
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  13. O canto do cisne da visão ortodoxa da Filosofia da Ciência.Osvaldo Pessoa Jr - 2004 - Scientiae Studia 2 (2):259-263.
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  14. What is an Essentially Quantum Mechanical Effect?Osvaldo Pessoa - 2001
  15.  6
    The Colored-Brain Thesis.Osvaldo Pessoa Jr - 2021 - Filosofia Unisinos 22 (1):84-93.
    The “colored-brain thesis”, or strong qualitative physicalism, is discussed from historical and philosophical perspectives. This thesis was proposed by Thomas Case, in a non-materialistic context, and is close to views explored by H. H. Price and E. Boring. Using Mary’s room thought experiment, one can argue that physicalism implies qualitative physicalism. Qualitative physicalism involves three basic statements: perceptual internalism, and realism of qualia; ontic physicalism, charaterized as a description in space, time, and scale; and mind-brain identity thesis. In addition, structuralism (...)
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  16.  5
    A Causal-Pluralist Metatheory of Observation.Osvaldo Pessoa - 2019 - Open Philosophy 2 (1):657-667.
    An extended definition of “observation” is developed in order to account for the usage in the physical sciences and in neuropsychology. An observation is initially defined as a perception that has a focus of attention and is guided by theoretical considerations. Since the focus may change, one adopts a pluralist position according to which the object of perception may involve any stage of the causal chain that leads to perception, such as the source of light or sound, the obstructions, the (...)
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  17.  8
    Are Untestable Scientific Theories Acceptable?Osvaldo Pessoa - 2016 - Science & Education 25 (3-4):443-448.
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  18.  12
    David Bohm E a Controvérsia Dos Quanta. [REVIEW]Osvaldo Pessoa Jr - 2003 - Isis 94:555-555.
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  19.  10
    Reversibility and the Interpretation of Mixtures in Quantum Mechanics.Osvaldo Pessoa - 1992 - PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1992:381 - 392.
    This paper examines the problem of the interpretation of mixtures in quantum mechanics, presenting a survey of the philosophical debate between the ignorance interpretation (IgI) and the instrumentalist approach. By defining specific procedures for preparing and analyzing mixed beams of polarized light, we show that an important argument in defense of the IgI is not valid: differently prepared but equivalent mixtures cannot be distinguished by measuring particle fluctuations. We present an alternative argument, based on an experiment to test whether the (...)
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  20.  13
    Towards a Modal Logical Treatment of Quantum Physics.Osvaldo Pessoa Jr - 2005 - Logic Journal of the IGPL 13 (1):139-147.
    The question of which is the logic that underlies quantum physics does not have an absolute answer, but only in relation to a conventional choice of interpretation . Most of the interpretations that have been offered work within the framework of classical logic. In contrast to these, we examine the corpuscular interpretation which is assumed in the application of non-distributive logic . The experiment in which single photons pass through a Mach-Zehnder interferometer is examined, indicating the difficulty of employing a (...)
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