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  1. added 2020-04-20
    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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  2. added 2020-04-18
    Théorie des cordes, gravité quantique à boucles et éternalisme.Baptiste Le Bihan - forthcoming - Métaphysique du Temps.
    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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  3. added 2020-04-16
    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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  4. added 2020-04-12
    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. added 2020-01-13
    String Theory, Loop Quantum Gravity and Eternalism.Baptiste Le Bihan - 2020 - European Journal for Philosophy of Science 10 (2):1-22.
    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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  6. added 2019-12-26
    Unificarea gravitației cu celalalte forțe fundamentale.Nicolae Sfetcu - manuscript
    Au fost propuse mai multe teorii unificatoare. Marea unificare presupune existența unei forțe electronucleare. Ultimul pas în unificare ar necesita o teorie care să includă atât mecanica cuantică cât și gravitația prin relativitatea generală (”teoria finală”). După 1990, unii fizicieni consideră că teoria M 11-dimensională, identificată adesea cu una dintre cele cinci teorii ale supercorzilor perturbative, sau uneori cu supergravitația maximal-supersimetrică 11-dimensională, este teoria finală. DOI: 10.13140/RG.2.2.23549.92642.
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  7. added 2019-12-22
    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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  8. added 2019-09-21
    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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  9. added 2019-08-15
    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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  10. added 2019-06-06
    Puppet on a String?: The Lessons of Structuralism.Mike Fuller - 1995 - Cogito 9 (2):137-141.
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  11. added 2019-03-25
    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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  12. added 2019-02-06
    Dualities and Intertheoretic Relations.Elena Castellani - 2009 - In Mauricio Suarez, Mauro Dorato & Miklos Redei (eds.), EPSA Philosophical Issues in the Sciences · Launch of the European Philosophy of Science Association. Springer. pp. 9--19.
    This is the first of two papers concerned with the philosophical significance of dualities as applied in recent fundamental physics. The general idea is that, for its peculiarity, this ‘new’ ingredient in theory construction can open unexpected perspectives in the current philosophical reflection on contemporary physics. In particular, today’s physical dualities represent an unusual type of intertheory relation, the meaning of which deserves to be investigated. The aim is to show how discussing this point brings into play, at the same (...)
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  13. added 2018-12-12
    What Can We Learn From Stringy Black Holes?Nick Huggett - manuscript
    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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  14. added 2018-11-14
    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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  15. added 2018-08-29
    Non-Empirical But Scientific (Response to "Physics on Edge" by George Ellis).Richard Dawid - 2017 - Inference 3 (3).
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  16. added 2018-08-08
    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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  17. added 2018-06-05
    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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  18. added 2018-01-12
    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. added 2018-01-10
    Emergent Spacetime and Empirical (in) Coherence.Nick Huggett & Christian Wüthrich - 2013 - Studies in History and Philosophy of Modern Physics 44 (3):276-285.
    Numerous approaches to a quantum theory of gravity posit fundamental ontologies that exclude spacetime, either partially or wholly. This situation raises deep questions about how such theories could relate to the empirical realm, since arguably only entities localized in spacetime can ever be observed. Are such entities even possible in a theory without fundamental spacetime? How might they be derived, formally speaking? Moreover, since by assumption the fundamental entities cannot be smaller than the derived and so cannot ‘compose’ them in (...)
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  20. added 2017-12-19
    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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  21. added 2017-12-08
    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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  22. added 2017-12-03
    The Non-Local to Local Space-Time Map.Paul Karl Hoiland - unknown
    While for point particles a local theory seems to be sufficient, when it comes to extended objects like Strings and Branes you by rights are not dealing with a specifically fully localized particle to begin with. This also is not the case for non-inertial particles interacting with a wave field (like, e.g., an accelerated atom interacting with the quantized electromagnetic field). The fact that a wave has an extension seems to make a non-local treatment necessary. By the same fact a (...)
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  23. added 2017-12-01
    Inter-Theory Relations in Quantum Gravity: Correspondence, Reduction, and Emergence.Karen Crowther - 2017 - Studies in History and Philosophy of Modern Physics.
    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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  24. added 2017-10-13
    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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  25. added 2017-10-04
    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. added 2017-09-29
    Millimeter Gravity and the Superstring Wall.John G. Cramer - unknown
    Why is gravity so weak? Why are the color forces between quarks so strong? In the standard model of particle physics, why are there so many different energies at which distinct fundamental forces are supposed to "unify", and what determines these widely separated energies? The answers to these questions may be provided by extra dimensions curled into loops a millimeter around. In other words, our universe may be only a millimeter across, in directions we are not yet able to perceive. (...)
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  27. added 2017-09-29
    Strings and Things.John Cramer - unknown
    Alternate View Column AV-19 Keywords: cosmic strings, gravitational lensing, angle deficit, superconductor, space drive Published in the April-1987 issue of Analog Science Fiction & Fact Magazine; This column was written and submitted 9/19/86 and is copyrighted © 1986, John G. Cramer. All rights reserved. No part may be reproduced in any form without the explicit permission of the author.
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  28. added 2017-02-13
    Sense Making and Learning in Complex Organisations: The String Quartet Revisited.George Tovstiga, Stefan Odenthal & Stephan Goerner - 2005 - International Journal of Management Concepts and Philosophy 1 (3):215.
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  29. added 2017-02-12
    Lee Smolin Makes a Critical Analysis of the" Theory of Everything". In a Crisis the Most Prestigious Theory in Theoretical Physics.Miguel Lorente - 2008 - Pensamiento 64 (242):1097-1102.
  30. added 2017-02-12
    The Dualities Fo Work Self-Consumption and Self-Creation.Jeff Malpas - 2005 - Philosophy Today 49 (3):256-263.
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  31. added 2017-02-11
    Debating the Final Theory.A. O. Barut - 1994 - Foundations of Physics 24 (11):1571-1576.
    Recent assertions that the present particle physics is on the path of a “final theory” which cannot be reduced to more fundamental ones is critically examined and confronted with a counter-thesis.
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  32. added 2017-01-29
    The Birth of String Theory. [REVIEW]Dean Rickles - 2013 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 44 (4):524-526.
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  33. added 2017-01-27
    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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  34. added 2017-01-27
    What is a Random String?Cristian Calude - 1995 - Vienna Circle Institute Yearbook 3:101-113.
    Suppose that persons A and B give us a sequence of 32 bits each, saying that they were obtained from independent coin flips. If A gives the stringu = 01001110100111101001101001110101and B gives the stringv = 00000000000000000000000000000000,then we would tend to believe A and would not believe B: the string u seems to be random, but the string v does not. Further on, if we change the value of a bit in a “random” string, then the result is still a “random” (...)
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  35. added 2017-01-26
    The Superstring Theory and Lee Smolin's Troubles with Physics.Wojciech P. Grygiel - 2010 - Filozofia Nauki 18 (3):141.
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  36. added 2017-01-21
    Contributors.Philip W. Anderson - unknown
    Is string theory a futile exercise as physics, as I believe it to be? It is an interesting mathematical specialty and has produced and will produce mathematics useful in other contexts, but it seems no more vital as mathematics than other areas of very abstract or specialized math, and doesn't on that basis justify the incredible amount of effort expended on it.
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  37. added 2017-01-19
    Solution to a Generalization of the Busy Beaver Problem.David Miller - manuscript
    Let ϕ be a fixed numerical function. If the k-state Turing machine M with input string ϕ(k) (that is, started in its initial state scanning the leftmost 1 of a single string of ϕ(k) 1s on an otherwise blank tape) produces the output string m (that is, halts in its halting state scanning the leftmost 1 of a single string of m 1s on an otherwise blank tape), we shall say that the ϕ-fecundity of M is m. If M halts (...)
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  38. added 2017-01-19
    Is a Transdisciplinary Perspective on Economic Complexiy Possible?Barkley Rosser - manuscript
    “When demand and supply are in stable equilibrium, if any accident should move the scale of production from its equilibrium position, there will be instantly brought into play forces tending to push it back to that position; just as if a stone hanging by a string is displaced from its equilibrium position… But in real life such oscillations are seldom as rhythmical as those of a stone hanging freely from a string; the comparison would be more exact if the string (...)
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  39. added 2017-01-17
    Consciousness Without Constraint: Open String Theory - One Loose End.Judy B. Gardiner - 2016 - Cosmos and History 12 (2):83-98.
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  40. added 2017-01-16
    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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  41. added 2017-01-16
    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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  42. added 2017-01-16
    Ab Initiomulti-String Frenkel–Kontorova Model for a B =a/2[111] Screw Dislocation in Bcc Iron.Mark R. Gilbert & Sergei L. Dudarev - 2010 - Philosophical Magazine 90 (7-8):1035-1061.
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  43. added 2017-01-15
    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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  44. added 2017-01-15
    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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  45. added 2017-01-15
    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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  46. added 2017-01-15
    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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  47. added 2017-01-14
    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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  48. added 2017-01-14
    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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  49. added 2017-01-14
    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.
  50. added 2017-01-14
    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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