About this topic
Summary General Relativity is our best large-scale physical theory. One often investigates which philosophical consequences follow from the theory. 
Key works Sklar 1974 is an early text. Earman 1995 is the definitive modern survey of philosophical topics. Malament 2012 is a self-contained primer to the mathematical and logical foundations. 
Introductions Glymour 1972, Malament 1984, Earman & Norton 1987, Earman et al 2009, Manchak 2009
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  1. added 2019-02-20
    Gravitația newtoniană și relativistă.Nicolae Sfetcu - manuscript
    Gravitația clasică newtoniană admite o descriere geometrică. Împreună cu relativitatea specială, aceasta permite o descriere euristică a teoriei relativității generale. Mișcarea inerțială din mecanica clasică este legată de geometria spațiului și timpului, practic de-a lungul unor geodezice în care liniile de univers sunt linii drepte în spațiu-timpul relativist. Conform relativității generale, forţa de gravitaţie este o manifestare a geometriei locale spaţiu-timp. Relativitatea generală este o teorie metrică a gravitației. La baza ei sunt ecuațiile lui Einstein, care descriu relația dintre geometria (...)
  2. added 2019-02-17
    The Ontology of General Relativity.Nicolae Sfetcu - manuscript
    General Relativity generated various early philosophical interpretations. His adherents have highlighted the "relativization of inertia" and the concept of simultaneity, Kantians and Neo-Kantians have underlined the approach of certain synthetic "intellectual forms" (especially the principle of general covariance, and logical empirics have emphasized the philosophical methodological significance of the theory. Reichenbach approached the GR through the "relativity of geometry" thesis, trying to build a "constructive axiomatization" of relativity based on "elementary matters of fact" (Elementartatbestande) for the observable behavior of light (...)
  3. added 2019-02-16
    The Metaphysics of Machian Frame-Dragging.Antonio Vassallo & Carl Hoefer - 2019 - In Claus Beisbart, Tilman Sauer & Christian Wüthrich (eds.), Thinking about Space and Time. Basel: Birkhäuser.
    The paper investigates the kind of dependence relation that best portrays Machian frame-dragging in general relativity. The question is tricky because frame-dragging relates local inertial frames to distant distributions of matter in a time-independent way, thus establishing some sort of non-local link between the two. For this reason, a plain causal interpretation of frame-dragging faces huge challenges. The paper will shed light on the issue by using a generalized structural equation model analysis in terms of manipulationist counterfactuals recently applied in (...)
  4. added 2019-02-12
    Introduction dans les théories de la relativité.Nicolae Sfetcu - manuscript
    Selon la relativité générale, la force gravitationnelle est une manifestation de la géométrie de l'espace-temps local. RG est une théorie métrique de la gravité. Il est basé sur les équations d'Einstein, qui décrivent la relation entre la géométrie d'une variété pseudo-riemannienne à quatre dimensions, représentant l'espace-temps et l'énergie-impulsion contenu dans cet espace-temps. La gravité correspond aux modifications des propriétés spatiales et temporelles, qui à leur tour modifient les chemins des objets. La courbure est causée par l'énergie-impulsion de la matière. Selon (...)
  5. added 2019-02-05
    Classical Theory of Singularities.Nicolae Sfetcu - manuscript
    The singularities from the general relativity resulting by solving Einstein's equations were and still are the subject of many scientific debates: Are there singularities in spacetime, or not? Big Bang was an initial singularity? If singularities exist, what is their ontology? Is the general theory of relativity a theory that has shown its limits in this case?
  6. added 2019-02-01
    Covariance/Invariance: A Cognitive Heuristic in Einstein's Relativity Theory Formation.Andrea Cerroni - 2000 - Foundations of Science 5 (2):209-224.
    Relativity Theory by Albert Einstein has been so far littleconsidered by cognitive scientists, notwithstanding its undisputedscientific and philosophical moment. Unfortunately, we don't have adiary or notebook as cognitively useful as Faraday's. But physicshistorians and philosophers have done a great job that is relevant bothfor the study of the scientist's reasoning and the philosophy ofscience. I will try here to highlight the fertility of a `triangulation'using cognitive psychology, history of science and philosophy of sciencein starting answering a clearly very complex question:why (...)
  7. added 2019-01-31
    General Relativity From A to B.James Weatherall - 2010 - Humana Mente 4 (13).
  8. added 2019-01-28
    What Is the Validity Domain of Einstein’s Equations? Distributional Solutions Over Singularities and Topological Links in Geometrodynamics.Elias Zafiris - 2016 - 100 Years of Chronogeometrodynamics: The Status of the Einstein's Theory of Gravitation in Its Centennial Year.
    The existence of singularities alerts that one of the highest priorities of a centennial perspective on general relativity should be a careful re-thinking of the validity domain of Einstein’s field equations. We address the problem of constructing distinguishable extensions of the smooth spacetime manifold model, which can incorporate singularities, while retaining the form of the field equations. The sheaf-theoretic formulation of this problem is tantamount to extending the algebra sheaf of smooth functions to a distribution-like algebra sheaf in which the (...)
  9. added 2019-01-27
    Differential Sheaves and Connections: A Natural Approach to Physical Geometry.Anastasios Mallios & Elias Zafiris - 2015 - World Scientific.
    This unique book provides a self-contained conceptual and technical introduction to the theory of differential sheaves. This serves both the newcomer and the experienced researcher in undertaking a background-independent, natural and relational approach to "physical geometry". In this manner, this book is situated at the crossroads between the foundations of mathematical analysis with a view toward differential geometry and the foundations of theoretical physics with a view toward quantum mechanics and quantum gravity. The unifying thread is provided by the theory (...)
  10. added 2019-01-16
    On the Fundamental Role of Massless Form of Matter in Physics.Alexander Klimets - 2017 - FIZIKA B (Zagreb) 9:23-42.
    In the article, with the help of various models, the thesis on the fundamental nature of the field form of matter in physics is considered. In the first chapter a model of special relativity is constructed, on the basis of which the priority of the massless form of matter is revealed. In the second chapter, a field model of inert and heavy mass is constructed and on this basis the mechanism of inertia and gravity of weighty bodies is revealed. In (...)
  11. added 2018-12-28
    Part 3: Programming Atomic and Gravitational Orbitals in a Simulation Hypothesis.Malcolm J. Macleod - manuscript
    This article introduces a method for programming orbitals at the Planck level. Mathematical probability orbitals are replaced with units of `orbit momentum' with orbital regions derived from geometrical imperatives rather than abstract forces. In this approach the electron does not orbit around a nucleus but rather is maintained within an orbital region by the confines of the geometry of the orbital (this orbit momentum is the orbital). There is no electron transition between orbitals, rather the existing orbital is exchanged for (...)
  12. added 2018-11-08
    Anchoring Causal Connections in Physical Concepts.Roland Poellinger & Mario Hubert - 2014 - In Maria Clara Galavotti, Dennis Dieks, W. J. Gonzalez, Stephan Hartmann, Thomas Uebel & Marcel Weber (eds.), New Directions in the Philosophy of Science. pp. 501-509.
    In their paper "How Fundamental Physics represents Causality", Andreas Bartels and Daniel Wohlfarth maintain that there is place for causality in General Relativity. Their argument contains two steps: First they show that there are time-asymmetric models in General Relativity, then they claim to derive that two events are causally connected if and only if there is a time-asymmetric energy flow from one event to the other. In our comment we first give a short summary of their paper followed by a (...)
  13. added 2018-10-30
    Have We Lost Spacetime on the Way? Narrowing the Gap Between General Relativity and Quantum Gravity.Baptiste Le Bihan & Niels Linnemann - forthcoming - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics.
    Important features of space and time are taken to be missing in quantum gravity, allegedly requiring an explanation of the emergence of spacetime from non-spatio-temporal theories. In this paper, we argue that the explanatory gap between general relativity and non-spatio- temporal quantum gravity theories might signifi cantly be reduced with two moves. First, we point out that spacetime is already partially missing in the context of general relativity when understood from a dynamical perspective. Second, we argue that most approaches to (...)
  14. added 2018-10-24
    Matters of Time Directionality in Classical Physics.Jean-Christophe Lindner - manuscript
    A complete and up-to-date analysis of the question of time directionality as it arises in a semi-classical context is provided which is based on key developments related to the theory of gravitation. Important clarifications are achieved regarding the concept of time reversal as a concept independent from the thermodynamic arrow of time. The role played by the Leibnizian constraint of relational definition of physical properties applied to the sign of electric charge and the energy of elementary particles is thoroughly examined (...)
  15. added 2018-10-16
    Clocks and Chronogeometry: Rotating Spacetimes and the Relativistic Null Hypothesis.Tushar Menon, Niels Linnemann & James Read - forthcoming - British Journal for the Philosophy of Science.
    Recent work in the physics literature demonstrates that, in particular classes of rotating spacetimes, physical light rays in general do not traverse null geodesics. Having presented this result, we discuss its philosophical significance, both for the clock hypothesis, and for the operational meaning of the metric field.
  16. added 2018-10-08
    Relativity, Causality and Weiss's Theory of Relations.Adolf Grünbaum - 1953 - Review of Metaphysics 7 (1):115 - 123.
  17. added 2018-10-03
    Background Independence: Lessons for Further Decades of Dispute.Trevor Teitel - 2018 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics.
    Background independence begins life as an informal property that a physical theory might have, often glossed as 'doesn't posit a fixed spacetime background'. Interest in trying to offer a precise account of background independence has been sparked by the pronouncements of several theorists working on quantum gravity that background independence embodies in some sense an essential discovery of the General Theory of Relativity, and a feature we should strive to carry forward to future physical theories. This paper has two goals. (...)
  18. added 2018-09-26
    Defining a Crisis: The Roles of Principles in the Search for a Theory of Quantum Gravity.Karen Crowther - forthcoming - Synthese:1-28.
    In times of crisis, when current theories are revealed as inadequate to task, and new physics is thought to be required---physics turns to re-evaluate its principles, and to seek new ones. This paper explores the various types, and roles of principles that feature in the problem of quantum gravity as a current crisis in physics. I illustrate the diversity of the principles being appealed to, and show that principles serve in a variety of roles in all stages of the crisis, (...)
  19. added 2018-09-22
    Einstein's Revolution: A Study in Theory Unification.Rinat M. Nugayev - 2018 - Sharjah, UAE: Bentham science publishers.
    Press release. -/- The ebook entitled, Einstein’s Revolution: A Study of Theory-Unification, gives students of physics and philosophy, and general readers, an epistemological insight into the genesis of Einstein’s special relativity and its further unification with other theories, that ended well by the construction of general relativity. The book was developed by Rinat Nugayev who graduated from Kazan State University relativity department and got his M.Sci at Moscow State University department of philosophy of science and Ph.D at Moscow Institute of (...)
  20. added 2018-09-19
    The Principle of Equivalence as a Criterion of Identity.Ryan Samaroo - forthcoming - Synthese:1-25.
    In 1907 Einstein had the insight that bodies in free fall do not “feel” their own weight. This has been formalized in what is called “the principle of equivalence.” The principle motivated a critical analysis of the Newtonian and special-relativistic concepts of inertia, and it was indispensable to Einstein’s development of his theory of gravitation. A great deal has been written about the principle. Nearly all of this work has focused on the content of the principle and whether it has (...)
  21. added 2018-09-19
    Friedman׳s Thesis.Ryan Samaroo - 2015 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 52 (Part B):129-138.
    This essay examines Friedman's recent approach to the analysis of physical theories. Friedman argues against Quine that the identification of certain principles as ‘constitutive’ is essential to a satisfactory methodological analysis of physics. I explicate Friedman's characterization of a constitutive principle, and I evaluate his account of the constitutive principles that Newtonian and Einsteinian gravitation presuppose for their formulation. I argue that something close to Friedman's thesis is defensible.
  22. added 2018-09-19
    On Identifying Background-Structure in Classical Field Theories.Ryan Samaroo - 2011 - Philosophy of Science 78 (5):1070-1081.
    I examine a property of theories called "background-independence" that Einsteinian gravitation is thought to exemplify. This concept has figured in the work of Rovelli (2001; 2004), Smolin (2006), Giulini (2007), and Belot (2011), among others. I propose and evaluate a few candidates for background-independence, and I show that there is something chimaerical about the concept. I argue, however, that there is a proposal that clarifies the feature of Einsteinian gravitation that motivates the concept.
  23. added 2018-09-16
    Lebensweltliche Und Physikalische Zeit.Gregor Schiemann - 2015 - In G. Hartung (ed.), Mensch und Zeit. Springer. pp. 207-225.
    Zur Aufklärung der vielschichtigen Beziehungen zwischen Lebenswelt und Physik diskutiere ich die für die beiden Erfahrungsweisen jeweils typischen Konzeptualisierungen von Zeit. Nach einer Einleitung beginne ich mit der Analyse der subjektiven und objektiven lebensweltlichen Zeitformen. Anschließend erörtere ich im dritten Abschnitt das Verhältnis von lebensweltlichen und physikalischen Elementen der Weltzeit. Vier physikalische Zeitverständnisse stelle ich in ihrer Differenz zur lebensweltlichen Auffassung im vierten Abschnitt dar. Historisch hat sich die generelle Tendenz zur Vergrößerung dieser Differenz fortgesetzt, ohne dass schon Instanzen zur (...)
  24. added 2018-08-15
    Some Disputed Aspects of Inertia, with Particular Reference to the Equivalence Principle.Ryan Samaroo - 2013 - Dissertation, The University of Western Ontario
    This thesis is a contribution to the foundations of space-time theories. It examines the proper understanding of the Newtonian and 1905 inertial frame concepts and the critical analysis of these concepts that was motivated by the equivalence principle. This is the hypothesis that it is impossible to distinguish locally between a homogeneous gravitational field and a uniformly accelerated frame. The three essays that comprise this thesis address, in one way or another, the criteria through which the inertial frame concepts are (...)
  25. added 2018-07-11
    Teleportative Observers Versus Special Relativity Observers: Work in Progress.James Goetz - manuscript
    Various authors argue that special relativity implies eternalism. For example, special relativity observers are limited by the relativity of simultaneity and cannot detect a preferred universal chronology, which is an important premise for the Rietdijk–Putnam argument which implies eternalism. However, I introduce "teleportative observers" which cohere with wormhole theory based on general relativity. Teleportative observers do not teleport objects but use hypothetical teleportative sight to detect every event in every quantum system of the universe. The teleportative sight permits detection at (...)
  26. added 2018-07-09
    Relativity Vs. Absolute Simultaneity: Varying Flow of Time or Varying Frequency?Avril Styrman - 2018 - Physics Essays 31 (3):256-284.
    The General Theory of Relativity (GR) and the Dynamic Universe (DU) are evaluated in how they explain frequencies of atomic clocks. DU and GR predict the frequencies with equal accuracy, but their explanations, the postulates they apply in the explanations and the word-views that come along with them are entirely different. The central argument is that if unified and under- standable physics is appreciated, then DU deserves to be taken as a viable alternative to GR. In GR different frequencies of (...)
  27. added 2018-06-28
    Towards a Theory of Spacetime Theories.Dennis Lehmkuhl, Gregor Schiemann & Erhard Scholz (eds.) - 2017 - Birkhauser.
    This contributed volume is the result of a July 2010 workshop at the University of Wuppertal Interdisciplinary Centre for Science and Technology Studies which brought together world-wide experts from physics, philosophy and history, in order to address a set of questions first posed in the 1950s: How do we compare spacetime theories? How do we judge, objectively, which is the “best” theory? Is there even a unique answer to this question? -/- The goal of the workshop, and of this book, (...)
  28. added 2018-06-25
    Singularitățile ca limite ontologice ale relativității generale.Nicolae Sfetcu - manuscript
    Singularitățile la care se ajunge în relativitatea generală prin rezolvarea ecuațiilor lui Einstein au fost și încă mai sunt subiectul a numeroase dezbateri științifice: Există sau nu, singularități? Big Bang a fost o singularitate inițială? Dacă singularitățile există, care este ontologia acestora? Este teoria generală a relativității o teorie care și-a arătat limitele în acest caz? În acest eseu argumentez faptul că există singularități, iar teoria generală a relativității, ca de altfel oricare altă teorie științifică din prezent, nu este valabilă (...)
  29. added 2018-06-22
    The Singularities as Ontological Limits of the General Relativity.Nicolae Sfetcu - manuscript
    The singularities from the general relativity resulting by solving Einstein's equations were and still are the subject of many scientific debates: Are there singularities in spacetime, or not? Big Bang was an initial singularity? If singularities exist, what is their ontology? Is the general theory of relativity a theory that has shown its limits in this case? In this essay I argue that there are singularities, and the general theory of relativity, as any other scientific theory at present, is not (...)
  30. added 2018-05-30
    A Study of Time in Modern Physics.Peter W. Evans - 2011 - Dissertation,
    This thesis is a study of the notion of time in modern physics, consisting of two parts. Part I takes seriously the doctrine that modern physics should be treated as the primary guide to the nature of time. To this end, it offers an analysis of the various conceptions of time that emerge in the context of various physical theories and, furthermore, an analysis of the relation between these conceptions of time and the more orthodox philosophical views on the nature (...)
  31. added 2018-05-23
    Quantum Gravity: A Dogma of Unification?Kian Salimkhani - 2018 - In Alexander Christian, David Hommen, Nina Retzlaff & Gerhard Schurz (eds.), Philosophy of Science. European Studies in Philosophy of Science, Vol 9. Cham: Springer. pp. 23-41.
    The quest for a theory of quantum gravity is usually understood to be driven by philosophical assumptions external to physics proper. It is suspected that specifically approaches in the context of particle physics are rather based on metaphysical premises than experimental data or physical arguments. I disagree. In this paper, I argue that the quest for a theory of quantum gravity sets an important example of physics’ internal unificatory practice. It is exactly Weinberg’s and others’ particle physics stance that reveals (...)
  32. added 2018-04-07
    Presentism and Relativity.Steven Umbrello - 2015 - The Oxford Philosopher.
    In this short paper I will be explicating and evaluating the arguments presented by Keller and Nelson in their paper, Presentists Should Believe in Time-Travel. I will show that their presuppositions, which are essential to their arguments, have the potential to devastate their position. We will see that one of these presuppositions comes into conflict with the General Theory of Relativity, and I will demonstrate that this endangers both their own agenda and presentism as a whole.
  33. added 2018-03-05
    Buddhism and Modern Physics, Volume 1.Robert Alan Paul - 2016 - Halifax, Canada: Self-published, Amazon.com.
    The book investigates distinctions between independent individuality and interactive relationality in physical phenomena. This is a common topic for investigation in modern physics and philosophy of science, and the topic is explored using contemporary research in those disciplines. Additionally, it is common for Buddhism to focus on relationships, and it proposes that independent individual things do not exist. In the context of physical reality, I take this Buddhist view as a hypothesis and examine it critically. We evaluate its arguments and (...)
  34. added 2018-02-17
    Gauge Theories and Holisms.Richard Healey - 2004 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (4):619-642.
    Those looking for holism in contemporary physics have focused their attention primarily on quantum entanglement. But some gauge theories arguably also manifest the related phenomenon of nonseparability. While the argument is strong for the classical gauge theory describing electromagnetic interactions with quantum “particles”, it fails in the case of general relativity even though that theory may also be formulated in terms of a connection on a principal fiber bundle. Anandan has highlighted the key difference in his analysis of a supposed (...)
  35. added 2018-02-17
    Energy Conservation in GTR.Carl Hoefer - 2000 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 31 (2):187-199.
    The topics of gravitational field energy and energy-momentum conservation in General Relativity theory have been unjustly neglected by philosophers. If the gravitational field in space free of ordinary matter, as represented by the metric g ab itself, can be said to carry genuine energy and momentum, this is a powerful argument for adopting the substantivalist view of spacetime.This paper explores the standard textbook account of gravitational field energy and argues that (a) so-called stress-energy of the gravitational field is well-defined neither (...)
  36. added 2018-02-17
    The Epistemology of Geometry.Clark Glymour - 1977 - Noûs 11 (3):227-251.
    Your use of the JSTOR archive indicates your acceptance of J STOR’s Terms and Conditions of Use, available at http://www.jstor.org/about/terms.html. J STOR’s Terms and Conditions of Use provides, in part, that unless you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content in the JSTOR archive only for your personal, non—commercial use.
  37. added 2018-02-16
    Can We Know the Global Structure of Spacetime?John Byron Manchak - 2009 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 40 (1):53-56.
    Here, we briefly review the notion of observational indistinguishability within the context of classical general relativity. We settle a conjecture given by Malament (1977) concerning the subject and then strengthen the result considerably. The upshot is this: There seems to be a robust sense in which the global structure of every cosmological model is underdetermined.
  38. added 2018-02-16
    Philosophical Relativity.Peter Unger - 1984 - Oxford University Press.
    In this short but meaty book, Peter Unger questions the objective answers that have been given to central problems in philosophy. As Unger hypothesizes, many of these problems are unanswerable, including the problems of knowledge and scepticism, the problems of free will, and problems of causation and explanation. In each case, he argues, we arrive at one answer only relative to an assumption about the meaning of key terms, terms like "know" and like "cause," even while we arrive at an (...)
  39. added 2018-02-09
    Time Order, Time Direction, and the Presentist’s View on Spacetime.Cord Friebe - 2016 - Kriterion - Journal of Philosophy 30 (2):91-106.
    The physical possibility of spacetimes containing closed timelike curves (CTCs) challenges the philosophy of time in the way that temporal ordering is, at best, remarkably non-standard: events on CTCs precede themselves. Apparently, such universes do not possess a consistent time order but only a consistent time direction. Thus, temporal directionality seems to be more fundamental than ordering in earlier-later or past-present-future. I will argue that this favors presentism as the adequate ontology of spacetimes: only presentism consistently copes with the idea (...)
  40. added 2018-02-09
    Storrs McCall's Tree of The Universe and Counterfactuals شجرة الكون وقضايا مناقضة الواقع عند ستورس مكال.Salah Osman - 1999 - Journal of the Faculty of Arts, Menoufia University 2956-2090 39:83 – 128.
    لم يكن العلم يومًا غريبًا عن الفلسفة، بل لقد أدت العلاقة الجدلية المستمرة بينهما إلى مزيد من المصداقية والقبول لبعض النماذج التفسيرية، سواء منها ما كان في الأصل نموذجًا فلسفيًا ثم وجد دعمًا علميًا – كنموذج الذرات والفـراغ عند «ديمرقــريطس» وتبنى النظرية الذرية الحديثة لإطاره العام – أو ما كان منها نموذجًا علميًا تم تداوله فلسفيًا – كنموذج النقاط المادية المتجاذبة عند »نيوتن« وتبنى معظم فلاسفة الحقبة الحديثة له. وفي هذا المقال يهتم الدكتور صلاح عثمان بمناقشة نموذج شجرة الكون لفيلسوف (...)
  41. added 2018-02-01
    General Relativity Eliminates Dark Energy, Dark Matter and Universal Expansion.Rodney Bartlett - 2018
    This letter was rejected by International Knowledge Press because "we are unable to conclude that these findings would warrant publication in this journal." The letter is suggesting that dark energy, dark matter and universal expansion are intimately related. However, they aren't viewed as revolutions in cosmology which are essential to a complete understanding of the modern universe. They are instead viewed as properties which need to be added to the cosmos when Einstein's theory of gravity (General Relativity) is apparently still (...)
  42. added 2018-01-17
    Spacetime and Geometry: An Introduction to General Relativity.Sean M. Carroll - 2003 - San Francisco, USA: Pearson.
    Graduate-level textbook in general relativity.
  43. added 2018-01-15
    Local and Global Properties of the World.Demaret Jacques, Heller Michael & Lambert Dominique - 1997 - Foundations of Science 2 (1):137-176.
    The essence of the method of physics is inseparably connected with the problem of interplay between local and global properties of the universe. In the present paper we discuss this interplay as it is present in three major departments of contemporary physics: general relativity, quantum mechanics and some attempts at quantizing gravity (especially geometrodynamics and its recent successors in the form of various pregeometry conceptions). It turns out that all big interpretative issues involved in this problem point towards the necessity (...)
  44. added 2018-01-12
    How Not to Establish the Non-Renormalizability of Gravity.Juliusz Doboszewski & Niels Linnemann - 2018 - Foundations of Physics 48 (2):237-252.
    General relativity cannot be formulated as a perturbatively renormalizable quantum field theory. An argument relying on the validity of the Bekenstein–Hawking entropy formula aims at dismissing gravity as non-renormalizable per se, against hopes that d-dimensional GR could turn out to have a non-perturbatively renormalizable d–dimensional quantum field theoretic formulation. In this note we discuss various forms of highly problematic semi-classical extrapolations assumed by both sides of the debate concerning what we call The Entropy Argument, and show that a large class (...)
  45. added 2017-12-08
    Verallgemeinerte Gravitationstheorie.Ulrich Hoyer - 1989 - Journal for General Philosophy of Science / Zeitschrift für Allgemeine Wissenschaftstheorie 20 (2):287-302.
    Proceeding from the principles of Euclidean geometry and absolute time a generalization of the classical theory of gravitation for high velocities is given. The new theory is applied to the redshift of spectral lines, the deviation of light passing the sun, and the secular motion of the perihelion of Mercury. A comparison with the results obtained from the theory of general relativity, though not beyond any doubt, seems to be favourable for the new theory, and to support the view, formerly (...)
  46. added 2017-12-08
    Coordinate-Free Relativity.Richard H. Hudgin - 1972 - Synthese 24 (1-2):281 - 297.
  47. added 2017-12-03
    Black Hole Unitarity and Antipodal Entanglement.Gerard ’T. Hooft - 2016 - Foundations of Physics 46 (9):1185-1198.
    Hawking particles emitted by a black hole are usually found to have thermal spectra, if not exactly, then by a very good approximation. Here, we argue differently. It was discovered that spherical partial waves of in-going and out-going matter can be described by unitary evolution operators independently, which allows for studies of space-time properties that were not possible before. Unitarity dictates space-time, as seen by a distant observer, to be topologically non-trivial. Consequently, Hawking particles are only locally thermal, but globally (...)
  48. 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 (...)
  49. added 2017-12-01
    Einstein's Struggle for a Machian Gravitation Theory.Carl Hoefer - 1994 - Studies in History and Philosophy of Science Part A 25 (3):287-335.
    The story of Einstein's struggle to create a general theory of relativity, and his early discontentment with the final form of the theory , is well known in broad outline. Thanks to the work of John Norton and others, much of the fine detail of the story is also now known. One aspect of Einstein's work in this period has, however, been relatively neglected: Einstein's commitment to Mach's ideas on inertia, and the influence this commitment had on Einstein's work on (...)
  50. added 2017-11-28
    Gerontological Observations Supporting Einstein and Mao.Henry R. Hirsch - 1997 - Perspectives in Biology and Medicine 40 (4):562-563.
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