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  1. Realism, Underdetermination and String Theory Dualities.Keizo Matsubara - 2013 - Synthese 190 (3):471-489.
    String theory promises to be able to provide us with a working theory of quantum gravity and a unified description of all fundamental forces. In string theory there are so called ‘dualities’; i.e. different theoretical formulations that are physically equivalent. In this article these dualities are investigated from a philosophical point of view. Semantic and epistemic questions relating to the problem of underdetermination of theories by data and the debate on realism concerning scientific theories are discussed. Depending on ones views (...)
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  2.  56
    Quantum Gravity and the Nature of Space and Time.Keizo Matsubara - 2017 - Philosophy Compass 12 (3):e12405.
    This is a nontechnical overview of how various approaches to quantum gravity suggest modifications to the way we conceptualize space and time. A theory of quantum gravity is needed to reconcile quantum physics with general relativity, our best theory for gravity. The most popular approaches to quantum gravity are string theory and loop quantum gravity. So far, no approach has been empirically successful, and there is no commonly accepted theory. Thus, the conclusions presented here are tentative. Many approaches suggest that (...)
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  3.  28
    Spacetime in String Theory: A Conceptual Clarification.Keizo Matsubara & Lars-Göran Johansson - 2018 - Journal for General Philosophy of Science / Zeitschrift für Allgemeine Wissenschaftstheorie 49 (3):333-353.
    In this paper, some conceptual issues are addressed in order to make sense of what string theory is supposed to tell us about spacetime. The dualities in string theory are used as a starting point for our argumentation. We explore the consequences of a standard view towards these dualities, namely that the dual descriptions represent the same physical situation. Given this view, one has to understand string theory in a manner such that what counts as physical spacetime is based only (...)
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  4. String Theory and General Methodology: A Mutual Evaluation.Lars-Göran Johansson & Keizo Matsubara - 2011 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 42 (3):199-210.
    String theory has been the dominating research field in theoretical physics during the last decades. Despite the considerable time elapse, no new testable predictions have been derived by string theorists and it is understandable that doubts have been voiced. Some people have argued that it is time to give up since testability is wanting. But the majority has not been convinced and they continue to believe that string theory is the right way to go. This situation is interesting for philosophy (...)
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  5.  1
    On Predictions and Explanations in Multiverse Scenarios.Keizo Matsubara - 2018 - In Antonio Piccolomini D’Aragona, Martin Carrier, Roger Deulofeu, Axel Gelfert, Jens Harbecke, Paul Hoyningen-Huene, Lara Huber, Peter Hucklenbroich, Ludger Jansen, Elizaveta Kostrova, Keizo Matsubara, Anne Sophie Meincke, Andrea Reichenberger, Kian Salimkhani & Javier Suárez (eds.), Philosophy of Science: Between the Natural Sciences, the Social Sciences, and the Humanities. Springer Verlag. pp. 43-54.
    Many contemporary physicists suggest that we should take the claim that we live in a multiverse seriously. When doing this they often invoke arguments based on the controversial anthropic principle. Critics argue that this leads to untestable and unscientific theories. In this paper criteria are suggested that need to be satisfied before a multiverse theory should be considered scientifically respectable. One important point is that the multiverse is described in sufficient detail. In some cases, a multiverse theory can be testable; (...)
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    Philosophy of Science: Between the Natural Sciences, the Social Sciences, and the Humanities.Antonio Piccolomini D’Aragona, Martin Carrier, Roger Deulofeu, Axel Gelfert, Jens Harbecke, Paul Hoyningen-Huene, Lara Huber, Peter Hucklenbroich, Ludger Jansen, Elizaveta Kostrova, Keizo Matsubara, Anne Sophie Meincke, Andrea Reichenberger, Kian Salimkhani & Javier Suárez (eds.) - 2018 - Springer Verlag.
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  7.  22
    Lost Horizon? – Modeling Black Holes in String Theory.Nick Huggett & Keizo Matsubara - unknown
    The modeling of black holes is an important desideratum for any quantum theory of gravity. Not only is a classical black hole metric sought, but also agreement with the laws of black hole thermodynamics. In this paper, we describe how these goals are obtained in string theory. We review black hole thermodynamics, and then explicate the general stringy derivation of classical spacetimes, the construction of a simple black hole solution, and the derivation of its entropy. With that in hand, we (...)
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  8. Från Skaradjäkne till Uppsalaprofessor: festskrift till Lars-Göran Johansson i samband med hans pensionering.George Masterton, Keizo Matsubara & Kim Solin - 2017
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  9.  57
    A Defence of String Theory: Richard Dawid: String Theory and the Scientific Method. Cambridge: Cambridge University Press, 2013, X+202pp, $90.25, £52.81 HB. [REVIEW]Keizo Matsubara - 2015 - Metascience 24 (2):189-194.
    String theory has been very influential within theoretical physics for the past few decades. It is the most popular attempt to solve the problem of formulating a viable theory of quantum gravity. Furthermore, it also unifies the other fundamental forces within one theoretical framework. In string theory, it is assumed that what before was thought to be point particles should really be seen as one-dimensional extended entities, i.e. strings. Different particles are supposed to correspond to various vibrational patterns of the (...)
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