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  1. Unification de la gravité avec les autres forces fondamentales.Sfetcu Nicolae - manuscript
    Plusieurs théories unificatrices ont été proposées. Une grande unification implique l'existence d'une force électronucléaire. La dernière étape de l'unification nécessiterait une théorie qui inclue à la fois la mécanique quantique et la gravité par la relativité générale (« la théorie finale »). Après 1990, certains physiciens considèrent que la théorie M à 11 dimensions, souvent identifiée à l'une des cinq théories des supercordes perturbateurs, ou parfois à la supergravité à supersymétrie maximale supersymétrique à 11 dimensions, est la théorie finale. L'idée (...)
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  2. Heuristique de la théorie des cordes.Sfetcu Nicolae - manuscript
    Comme la théorie des cordes n'a jusqu'à présent pas pu expliquer les phénomènes, il peut sembler que cela confirme l'opinion de Feyerabend selon laquelle il n'y a pas de « méthode » de la science. Et pourtant, la théorie des cordes est toujours le programme de recherche le plus actif pour la gravité quantique. Mais, par rapport à d'autres théories non falsifiables, cela a quelque chose de plus, en particulier : le langage mathématique, avec une logique claire de décoctions. Jusqu'à (...)
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  3. Épistémologie de la théorie des cordes.Sfetcu Nicolae - manuscript
    Le programme de recherche sur la théorie des cordes est basé sur l'hypothèse de 1930 que la relativité générale ressemble à la théorie d'un champ de spin-deux sans masse dans l'espace plat minkowskian . La quantification d'une telle théorie s'est avérée être renormalisable sans perturbation, impliquant une infinité qui ne peut être éliminée. Cette première théorie a été abandonnée jusqu'au milieu des années 1970, lorsqu'elle s'est développée en tant que théorie des cordes unidimensionnelle. Plus tard, a été développé la théorie (...)
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  4. Epistemology of String Theory in Quantum Gravity.Nicolae Sfetcu - manuscript
    In quantum field theory, the main obstacle is the occurrence of the untreatable infinities in the interactions of the particles due to the possibility of arbitrary distances between the point particles. Strings, as extended objects, provide a better framework, which allows finite calculations. String theory is part of a research program in which point particles in particle physics are replaced by one-dimensional objects called strings. It describes how these strings propagate through space and interact with one another. The purpose of (...)
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  5. Epistemologia teoriei corzilor în gravitația cuantică.Nicolae Sfetcu - manuscript
    În teoria câmpului cuantic, principalul obstacol este apariția infinităților netratabile în interacțiunile particulelor datorită posibilității unor distanțe arbitrare între particulele punctuale. Corzile, ca obiecte extinse, oferă un cadru mai bun, care permite calcule finite. Teoria corzilor face parte dintr-un un program de cercetare în care particulele punctuale din fizica particulelor sunt înlocuite de obiecte unidimensionale numite corzi. Ea descrie modul în care aceste corzi se propagă prin spațiu și interacționează una cu cealaltă. La scale de dimensiuni mai mari, o coardă (...)
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  6. Euristica teoriei corzilor în gravitația cuantică.Nicolae Sfetcu - manuscript
    Întrucât teoria corzilor nu a fost până în prezent capabilă să explice fenomenele, ar putea părea că aceasta confirmă opinia lui Feyerabend că nu există o "metodă" a științei. Și totuși, teoria corzilor este în continuare cel mai activ program de cercetare pentru gravitația cuantică. Dar, față de alte teorii nefalsificabile, aceasta are ceva în plus, special: limbajul matematic, cu o logică clară a decucțiilor. Până la un punct poate reproduce teoriile clasice gauge și relativitatea generală. Și există speranța ca (...)
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  7. Heuristics of String Theory.Nicolae Sfetcu - manuscript
    Since string theory has not been able to explain phenomena to date, it may seem that this confirms Feyerabend's view that there is no "method" of science. And yet, string theory is still the most active research program for quantum gravity. But, compared to other non-falsifiable theories, this has something extra, especially mathematical language, with a clear logic of deductions. Up to a point it can reproduce classical gauge theories and general relativity. And there is hope that in the not (...)
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  8. What Can We Learn From Stringy Black Holes?Nick Huggett - 2018
    This paper aims to address conceptual issues concerning black holes in the context of string theory, with the aim of illuminating the ontological unification of gravity and matter, and the interpretation of cosmological models. §1 describes the central concepts of the theory: the fungibility of matter and geometry, and the reduction of gravity and supergravity. The ‘standard’ interpretation presented draws on that implicit in the thinking of many (but not all) string theorists, though made more explicit and systematic than usual. (...)
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  9. From Quantum Entanglement to Spatiotemporal Distance.Alyssa Ney - forthcoming - In Christian Wüthrich, Baptiste Le Bihan & Nick Huggett (eds.), Philosophy Beyond Spacetime. Oxford:
    Within the field of quantum gravity, there is an influential research program developing the connection between quantum entanglement and spatiotemporal distance. Quantum information theory gives us highly refined tools for quantifying quantum entanglement such as the entanglement entropy. Through a series of well-confirmed results, it has been shown how these facts about the entanglement entropy of component systems may be connected to facts about spatiotemporal distance. Physicists are seeing these results as yielding promising methods for better understanding the emergence of (...)
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  10. Théorie des cordes, gravité quantique à boucles et éternalisme.Baptiste Le Bihan - 2021 - In Alexandre Declos & Claudine Tiercelin (eds.), La métaphysique du temps : perspectives contemporaines. Paris: Collège de France.
    L'éternalisme, la thèse selon laquelle les entités que nous catégorisons comme étant passées, présentes et futures existent tout autant, est la meilleure approche ontologique de l'existence temporelle qui soit en accord avec les théories de la relativité restreinte et de la relativité générale. Cependant, les théories de la relativité restreinte et générale ne sont pas fondamentales si bien que plusieurs programmes de recherche tentent de trouver une théorie plus fondamentale de la gravité quantique rassemblant tous les enseignements de la physique (...)
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  11. The Landscape and the Multiverse: What’s the Problem?James Read & Baptiste Le Bihan - 2021 - Synthese 1:1-23.
    As a candidate theory of quantum gravity, the popularity of string theory has waxed and waned over the past four decades. One current source of scepticism is that the theory can be used to derive, depending upon the input geometrical assumptions that one makes, a vast range of different quantum field theories, giving rise to the so-called landscape problem. One apparent way to address the landscape problem is to posit the existence of a multiverse; this, however, has in turn drawn (...)
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  12. String Theory, Loop Quantum Gravity and Eternalism.Baptiste Le Bihan - 2020 - European Journal for Philosophy of Science 10:17.
    Eternalism, the view that what we regard locally as being located in the past, the present and the future equally exists, is the best ontological account of temporal existence in line with special and general relativity. However, special and general relativity are not fundamental theories and several research programs aim at finding a more fundamental theory of quantum gravity weaving together all we know from relativistic physics and quantum physics. Interestingly, some of these approaches assert that time is not fundamental. (...)
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  13. Epistémologie de la gravité expérimentale - Rationalité scientifique.Nicolae Sfetcu - 2020 - Drobeta Turnu Severin: MultiMedia Publishing.
    L'évolution des tests gravitationnels dans une perspective épistémologique encadré dans le concept de reconstruction rationnelle d'Imre Lakatos, fondée sur sa méthodologie de programmes de recherche. Contrairement à d'autres travaux sur le même sujet, la période évaluée est très longue, allant de la philosophie naturelle de Newton aux théories de la gravité quantique d'aujourd'hui. Afin d'expliquer de manière plus rationnelle l'évolution complexe du concept de gravité du siècle dernier, je propose une extension naturelle de la méthodologie des programmes de recherche que (...)
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  14. Two Notions of Naturalness.Porter Williams - 2019 - Foundations of Physics 49 (9):1022-1050.
    My aim in this paper is twofold: to distinguish two notions of naturalness employed in beyond the standard model physics and to argue that recognizing this distinction has methodological consequences. One notion of naturalness is an “autonomy of scales” requirement: it prohibits sensitive dependence of an effective field theory’s low-energy observables on precise specification of the theory’s description of cutoff-scale physics. I will argue that considerations from the general structure of effective field theory provide justification for the role this notion (...)
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  15. String Theory, Non-Empirical Theory Assessment, and the Context of Pursuit.Frank Cabrera - 2018 - Synthese:1-29.
    In this paper, I offer an analysis of the radical disagreement over the adequacy of string theory. The prominence of string theory despite its notorious lack of empirical support is sometimes explained as a troubling case of science gone awry, driven largely by sociological mechanisms such as groupthink (e.g. Smolin 2006). Others, such as Dawid (2013), explain the controversy by positing a methodological revolution of sorts, according to which string theorists have quietly turned to nonempirical methods of theory assessment given (...)
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  16. Doubts for Dawid's Non-Empirical Theory Assessment.Cristin Chall - 2018 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 63:128-135.
    Dawid's account of non-empirical theory assessment is meant to complement traditional theory assessments. I contend that his arguments don't provide support for this account. His three arguments, the no alternatives argument, the unexpected explanatory connections argument, and the meta-inductive argument from prior theories' success, are all problematic, particularly for an assessment of string theory. In particular, I argue that the meta-inductive argument is idle, because it's role in underwriting the future predictive success of a theory is subsumed by the normal (...)
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  17. Inter-Theory Relations in Quantum Gravity: Correspondence, Reduction and Emergence.Karen Crowther - 2018 - Studies in History and Philosophy of Modern Physics 63:74-85.
    Relationships between current theories, and relationships between current theories and the sought theory of quantum gravity (QG), play an essential role in motivating the need for QG, aiding the search for QG, and defining what would count as QG. Correspondence is the broad class of inter-theory relationships intended to demonstrate the necessary compatibility of two theories whose domains of validity overlap, in the overlap regions. The variety of roles that correspondence plays in the search for QG are illustrated, using examples (...)
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  18. Delimiting the Unconceived.Richard Dawid - 2018 - Foundations of Physics 48 (5):492-506.
    It has been argued in Dawid that physicists at times generate substantial trust in an empirically unconfirmed theory based on observations that lie beyond the theory’s intended domain. A crucial role in the reconstruction of this argument of “non-empirical confirmation” is played by limitations to scientific underdetermination. The present paper discusses the question as to how generic the role of limitations to scientific underdetermination really is. It is argued that assessing such limitations is essential for generating trust in any theory’s (...)
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  19. Priority Monism Beyond Spacetime.Baptiste Le Bihan - 2018 - Metaphysica 19 (1):95-111.
    I will defend two claims. First, Schaffer's priority monism is in tension with many research programs in quantum gravity. Second, priority monism can be modified into a view more amenable to this physics. The first claim is grounded in the fact that promising approaches to quantum gravity such as loop quantum gravity or string theory deny the fundamental reality of spacetime. Since fundamental spacetime plays an important role in Schaffer's priority monism by being identified with the fundamental structure, namely the (...)
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  20. Duality and Ontology.Baptiste Le Bihan & James Read - 2018 - Philosophy Compass 13 (12):e12555.
    A ‘duality’ is a formal mapping between the spaces of solutions of two empirically equivalent theories. In recent times, dualities have been found to be pervasive in string theory and quantum field theory. Naïvely interpreted, duality-related theories appear to make very different ontological claims about the world—differing in e.g. space-time structure, fundamental ontology, and mereological structure. In light of this, duality-related theories raise questions familiar from discussions of underdetermination in the philosophy of science: in the presence of dual theories, what (...)
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  21. Non-Empirical But Scientific (Response to "Physics on Edge" by George Ellis).Richard Dawid - 2017 - Inference 3 (3).
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  22. Target Space ≠ Space.Nick Huggett - 2017 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 59:81-88.
    This paper investigates the significance of T-duality in string theory: the indistinguisha- bility with respect to all observables, of models attributing radically different radii to space – larger than the observable universe, or far smaller than the Planck length, say. Two interpretational branch points are identified and discussed. First, whether duals are physically equivalent or not: by considering a duality of the familiar simple harmonic oscillator, I argue that they are. Unlike the oscillator, there are no measurements ‘outside’ string theory (...)
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  23. Dualities of Fields and Strings.Joseph Polchinski - 2017 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 59:6-20.
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  24. Quantum Gravity and Taoist Cosmology: Exploring the Ancient Origins of Phenomenological String Theory.Steven M. Rosen - 2017 - Progress in Biophysics and Molecular Biology 131:34-60.
    In the author’s previous contribution to this journal (Rosen 2015), a phenomenological string theory was proposed based on qualitative topology and hypercomplex numbers. The current paper takes this further by delving into the ancient Chinese origin of phenomenological string theory. First, we discover a connection between the Klein bottle, which is crucial to the theory, and the Ho-t’u, a Chinese number archetype central to Taoist cosmology. The two structures are seen to mirror each other in expressing the psychophysical (phenomenological) action (...)
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  25. Conceptual Aspects of Gauge/Gravity Duality.Sebastian de Haro, Daniel Mayerson & Jeremy Butterfield - 2016 - Foundations of Physics 46 (11):1381-1425.
    We give an introductory review of gauge/gravity duality, and associated ideas of holography, emphasising the conceptual aspects. The opening sections gather the ingredients, viz. anti-de Sitter spacetime, conformal field theory and string theory, that we need for presenting, in Sect. 5, the central and original example: Maldacena’s AdS/CFT correspondence. Sections 6 and 7 develop the ideas of this example, also in applications to condensed matter systems, QCD, and hydrodynamics. Sections 8 and 9 discuss the possible extensions of holographic ideas to (...)
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  26. Consciousness Without Constraint: Open String Theory - One Loose End.Judy B. Gardiner - 2016 - Cosmos and History 12 (2):83-98.
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  27. Unified Description of Bianchi Type-I Universe in $$F\,$$ F Gravity.S. D. Katore, S. P. Hatkar & R. J. Baxi - 2016 - Foundations of Physics 46 (4):409-427.
    The present study explores the Bianchi type I universe in the frame work of f theory of gravity by considering strange quark matter attached to string cloud and domain walls in the presence and absence of magnetism. Field equations are solved by choosing a constant curvature method. It is found that obtained cosmological models are relevant to the early era of evolution of the universe. The strange quark matter may be a source of string cloud and domain walls.
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  28. Review of Hyperspace by Michio Kaku (1994).Starks Michael - 2016 - In Michael Starks (ed.), Suicidal Utopian Delusions in the 21st Century: Philosophy, Human Nature and the Collapse of Civilization-- Articles and Reviews 2006-2017 2nd Edition Feb 2018. Michael Starks. pp. 620-626.
    "There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact" Mark Twain-Life on the Mississippi -/- This is a lovely book full of fascinating info on the evolution of physics and cosmology. Its main theme is how the idea of higher dimensional geometry created by Riemann, recently extended to 24 dimensions by string theory, has revolutionized our understanding of the universe. Everyone knows that Riemann created multidimensional geometry in 1854 (...)
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  29. The Interpretation of String-Theoretic Dualities.James Read - 2016 - Foundations of Physics 46 (2):209-235.
    We analyse the possibility that string-theoretic dualities present a genuine case of strong underdetermination of theory by evidence. Drawing on the parallel discussion of the hole argument, we assess the possible interpretations of dualities. We conclude that there exist at least two defensible interpretations on which dualities do not present a worrying case of underdetermination per se.
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  30. Richard Dawid String Theory and the Scientific Method. [REVIEW]Dean Rickles - 2016 - British Journal for the Philosophy of Science 67 (3):925-929.
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  31. A Theory of Everything. Review of Richard Dawid: String Theory and the Scientific Method. [REVIEW]Samuel Schindler - 2016 - Philosophy of Science 83 (3):453-8.
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  32. Dean Rickles. A Brief History of String Theory: From Dual Models to M-Theory. Xix + 251 Pp., Figs., Tables, Index. Berlin: Springer, 2014. €42.39. [REVIEW]Alexander Blum - 2015 - Isis 106 (4):990-991.
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  33. The Role of Heuristic Appraisal in Conflicting Assessments of String Theory.Kristian Camilleri & Sophie Ritson - 2015 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 51:44-56.
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  34. A. Cappelli, E. Castellani, F. Colomo and P. Di Vecchia : The Birth of String Theory: Cambridge University Press, Cambridge, 664 Pages, Hardback, ISBN: 9780521197908.Sebastian de Haro, Jans Henke & Darrell Tang - 2015 - Foundations of Physics 45 (6):657-660.
    The Birth of String Theory by Cappelli et al. tells the story of the beginnings of string theory and of the evolutionary process it has undergone from its origins in S-matrix theory to its current status as a candidate unification theory. The book is intended for an audience of students and researchers in physics, as well as historians and philosophers of science with some background in quantum field theory.In the 50s and early 60s, theoretical particle physics focused on formulating a (...)
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  35. Klein Paradox for the Bosonic Equation in the Presence of Minimal Length.M. Falek, M. Merad & M. Moumni - 2015 - Foundations of Physics 45 (5):507-524.
    We present an exact solution of the one-dimensional modified Klein Gordon and Duffin Kemmer Petiau equations with a step potential in the presence of minimal length in the uncertainty relation, where the expressions of the new transmission and reflection coefficients are determined for all cases. As an application, the Klein paradox in the presence of minimal length is discussed for all equations.
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  36. Deriving General Relativity From String Theory.Nick Huggett & Tiziana Vistarini - 2015 - Philosophy of Science 82 (5):1163-1174.
    Weyl symmetry of the classical bosonic string Lagrangian is broken by quantization, with profound consequences described here. Reimposing symmetry requires that the background space-time satisfy the equations of general relativity: general relativity, hence classical space-time as we know it, arises from string theory. We investigate the logical role of Weyl symmetry in this explanation of general relativity: it is not an independent physical postulate but required in quantum string theory, so from a certain point of view it plays only a (...)
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  37. 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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  38. Structural Pluralism and S-Dualities: A Project in String Realism.Ioan Muntean - 2015 - In Iulian D. Toader, Gabriel Sandu & Ilie Pȃrvu (eds.), Romanian Studies in Philosophy of Science. Springer Verlag. pp. 199-219.
  39. Metaphysics From String Theory: S-Dualities, Fundamentality, Modality and Pluralism.Ioan Muntean - 2015 - In T. Bigaj & Ch Wuthrich (eds.), Metaphysics in Contemporary Physics. Brill/Rodopi. pp. 259–292.
    Some philosophers of science have suggested that contemporary science should be the source of inspiration to the new analytic metaphysics (A. Chakra vartty, C. Callender, S. French, J. Ladyman, T. Maudlin, etc.). This paper explores the prospect of a string metaphysics: a research program in analytic metaphysics based on string theory. Different forms of fundamentalism and pluralism are discussed in this context. The paper focus on string metaphysics with S-dualities (a relation between models of string theory at different coupling regimes) (...)
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  40. Contested Boundaries: The String Theory Debates and Ideologies of Science.Sophie Ritson & Kristian Camilleri - 2015 - Perspectives on Science 23 (2):192-227.
    “The confrontation between string theory and its critics,” writes Jarod Lanier, “is one of the great intellectual dramas of our age”. String theory is widely regarded by its practitioners as the only the only viable option for constructing a unified theory of gravity and elementary particle physics. It has attracted an unprecedented number of researchers, including many Nobel Laureates, and has been instrumental in opening up new areas at the intersection of mathematics and physics.. Yet, since the 1980s it has (...)
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  41. String Theory & the Scientific Method.Fedde Benedictus - 2014 - Foundations of Physics 44 (6):589-593.
    The PreambleIn the early seventies the newly discovered gauge symmetries had made it possible to give a unified description of three of the four basic forces in nature.Dawid [1]. However, it remained a mystery how the force of gravity was to be incorporated in the resulting standard model. In 1974 it was proposed by Joel Scherk and John Schwarz that string theory—which until then was regarded as a theory only of hadrons—was a theory that could unite the whole of microphysics. (...)
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  42. Squaring the Circle: Gleb Wataghin and the Prehistory of Quantum Gravity.Amit Hagar - 2014 - Studies in the History and the Philosophy of Modern Physics 46 (2):217-227.
    The early history of the attempts to unify quantum theory with the general theory of relativity is depicted through the work of the under--appreciated Italo-Brazilian physicist Gleb Wataghin, who is responsible for many of the ideas that the quantum gravity community is entertaining today.
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  43. Superstrings and the Foundations of Quantum Mechanics.Gerard ’T. Hooft - 2014 - Foundations of Physics 44 (5):463-471.
    It is put forward that modern elementary particle physics cannot be completely unified with the laws of gravity and general relativity without addressing the question of the ontological interpretation of quantum mechanics itself. The position of superstring theory in this general question is emphasized: superstrings may well form exactly the right mathematical system that can explain how quantum mechanics can be linked to a deterministic picture of our world. Deterministic interpretations of quantum mechanics are usually categorically rejected, because of Bell’s (...)
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  44. String Theory and the Scientific Method: Interview with Richard Dawid.Luca Moretti - 2014 - The Reasoner 8 (8):87-89.
  45. String Theory and the Scientific Method.Tiziana Vistarini - 2014 - International Studies in the Philosophy of Science 28 (1):108-111.
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  46. Theory Assessment and Final Theory Claim in String Theory.Richard Dawid - 2013 - Foundations of Physics 43 (1):81-100.
    String theory has by now maintained a highly influential position in high energy physics for more than a quarter of a century. The present article analyses the reasons for the considerable trust exponents of string theory have in their theory even though it has neither found empirical confirmation nor a complete formulation up to this point. It is argued that this trust can be understood in terms of an emerging new conception of theory assessment that relies strongly on the identification (...)
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  47. String Theory and the Scientific Method.Richard Dawid - 2013 - Cambridge University Press.
    String theory has played a highly influential role in theoretical physics for nearly three decades and has substantially altered our view of the elementary building principles of the Universe. However, the theory remains empirically unconfirmed, and is expected to remain so for the foreseeable future. So why do string theorists have such a strong belief in their theory? This book explores this question, offering a novel insight into the nature of theory assessment itself. Dawid approaches the topic from a unique (...)
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  48. Forty Years of String Theory Reflecting on the Foundations.Sebastian de Haro, Dennis Dieks, Gerard ’T. Hooft & Erik Verlinde - 2013 - Foundations of Physics 43 (1):1-7.
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  49. Erratum To: String and M-Theory: Answering the Critics. [REVIEW]M. J. Duff - 2013 - Foundations of Physics 43 (2):284-284.
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  50. String and M-Theory: Answering the Critics. [REVIEW]M. J. Duff - 2013 - Foundations of Physics 43 (1):182-200.
    Using as a springboard a three-way debate between theoretical physicist Lee Smolin, philosopher of science Nancy Cartwright and myself, I address in layman’s terms the issues of why we need a unified theory of the fundamental interactions and why, in my opinion, string and M-theory currently offer the best hope. The focus will be on responding more generally to the various criticisms. I also describe the diverse application of string/M-theory techniques to other branches of physics and mathematics which render the (...)
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  51. Nothing in this category. Everyone can categorize entries. Please help if you have the expertise.