Results for 'Quantum Gravity, Empirical Coherence, Spacetime Functionalism, Spatiotemporal Concepts, Transparency'

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  1. Thinking about Spacetime.David Yates - 2021 - In Christian Wüthrich, Baptiste Le Bihan & Nick Huggett (eds.), Philosophy Beyond Spacetime: Implications From Quantum Gravity. Oxford: Oxford University Press.
    Several different quantum gravity research programmes suggest, for various reasons, that spacetime is not part of the fundamental ontology of physics. This gives rise to the problem of empirical coherence: if fundamental physical entities do not occupy spacetime or instantiate spatiotemporal properties, how can fundamental theories concerning those entities be justified by observation of spatiotemporally located things like meters, pointers and dials? I frame the problem of empirical coherence in terms of entailment: how could (...)
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  2. Spacetime Emergence in Quantum Gravity: Functionalism and the Hard Problem.Baptiste Le Bihan - 2019 - Synthese 199 (2):371–393.
    Spacetime functionalism is the view that spacetime is a functional structure implemented by a more fundamental ontology. Lam and Wüthrich have recently argued that spacetime functionalism helps to solve the epistemological problem of empirical coherence in quantum gravity and suggested that it also (dis)solves the hard problem of spacetime, namely the problem of offering a picture consistent with the emergence of spacetime from a non-spatio-temporal structure. First, I will deny that spacetime functionalism (...)
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  3. As below, so before: ‘synchronic’ and ‘diachronic’ conceptions of spacetime emergence.Karen Crowther - 2020 - Synthese 198 (8):7279-7307.
    Typically, a less fundamental theory, or structure, emerging from a more fundamental one is an example of synchronic emergence. A model emerging from a prior model upon which it nevertheless depends is an example of diachronic emergence. The case of spacetime emergent from quantum gravity and quantum cosmology challenges these two conceptions of emergence. Here, I propose two more-general conceptions of emergence, analogous to the synchronic and diachronic ones, but which are potentially applicable to the case of (...)
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  4. Spacetime Emergence: Collapsing the Distinction Between Content and Context?Karen Crowther - 2022 - In Shyam Wuppuluri & Ian Stewart (eds.), From Electrons to Elephants and Elections: Exploring the Role of Content and Context. Springer Nature. pp. 379–402.
    Several approaches to developing a theory of quantum gravity suggest that spacetime—as described by general relativity—is not fundamental. Instead, spacetime is supposed to be explained by reference to the relations between more fundamental entities, analogous to `atoms' of spacetime, which themselves are not (fully) spatiotemporal. Such a case may be understood as emergence of \textit{content}: a `hierarchical' case of emergence, where spacetime emerges at a `higher', or less-fundamental, level than its `lower-level' non-spatiotempral basis. But (...)
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  5. Philosophy Beyond Spacetime: Introduction.Christian Wüthrich, Baptiste Le Bihan & Nick Huggett - 2021 - In Christian Wüthrich, Baptiste Le Bihan & Nick Huggett (eds.), Philosophy Beyond Spacetime: Implications From Quantum Gravity. Oxford: Oxford University Press. pp. 1-15.
    The present volume collects essays on the philosophical foundations of quantum theories of gravity, such as loop quantum gravity and string theory. Central for philosophical concerns is quantum gravity's suggestion that space and time, or spacetime, may not exist fundamentally, but instead be a derivative entity emerging from non-spatiotemporal degrees of freedom. In the spirit of naturalised metaphysics, contributions to this volume consider the philosophical implications of this suggestion. In turn, philosophical methods and insights are (...)
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  6. Have we Lost Spacetime on the Way? Narrowing the Gap between General Relativity and Quantum Gravity.Baptiste Le Bihan & Niels Siegbert Linnemann - 2019 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 65 (C):112-121.
    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 significantly 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 (...)
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  7. Inter-theory Relations in Quantum Gravity: Correspondence, Reduction and Emergence.Karen Crowther - 2018 - Studies in History and Philosophy of Science Part B: 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 (...)
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  8. Renormalizability, Fundamentality, and a Final Theory: The Role of UV-Completion in the Search for Quantum Gravity.Karen Crowther & Niels Linnemann - 2017 - British Journal for the Philosophy of Science 70 (2):377-406.
    Principles are central to physical reasoning, particularly in the search for a theory of quantum gravity, where novel empirical data are lacking. One principle widely adopted in the search for QG is ultraviolet completion: the idea that a theory should hold up to all possible high energies. We argue— contra standard scientific practice—that UV-completion is poorly motivated as a guiding principle in theory-construction, and cannot be used as a criterion of theory-justification in the search for QG. For this, (...)
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  9. From Quantum Entanglement to Spatiotemporal Distance.Alyssa Ney - 2021 - In Christian Wüthrich, Baptiste Le Bihan & Nick Huggett (eds.), Philosophy Beyond Spacetime: Implications From Quantum Gravity. Oxford: Oxford University Press.
    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 (...)
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  10. Group Field Theories: Decoupling Spacetime Emergence from the Ontology of non-Spatiotemporal Entities.Marco Forgione - 2024 - European Journal for Philosophy of Science 14 (22):1-23.
    With the present paper I maintain that the group field theory (GFT) approach to quantum gravity can help us clarify and distinguish the problems of spacetime emergence from the questions about the nature of the quanta of space. I will show that the mechanism of phase transition suggests a form of indifference between scales (or phases) and that such an indifference allows us to black-box questions about the nature of the ontology of the fundamental levels of the theory. (...)
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  11. Metaphysical implications of causal non separability.Laurie Letertre - 2022 - Dissertation, Universite Grenoble Alpes
    In quantum mechanics, quantum nonseparability is at the core of philosophical debates regarding its meaning. In the context of the process matrix formalism, causal nonseparability characterises quantum processes (connecting the inputs and outputs of different local quantum operations) that are incompatible with any definite causal structure among interacting parties. One talks about indefinite causal orders. A famous example of causally nonseparable processes is called the quantum switch (QS). It is extensively studied in the literature in (...)
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  12.  24
    Awareness as the First Principle: A New Model of Reality, Time, and Energy.Ramlingeshwar Beesam - forthcoming - Andquot;Awareness as the First Principle: A New Model of Reality, Time, and Energy". Translated by Ramlingeshwar Reddy Beesam.
    The Fundamental Sequence of Reality: Awareness as the First Cause Abstract The nature of reality has long been debated in philosophy, physics, and cosmology. The dominant paradigm suggests that physical reality emerged through energy interactions following the Big Bang. However, this paper proposes a fundamental shift in perspective: that awareness is the first cause of existence, preceding time, action, energy, and matter. This model aligns with modern quantum mechanics, neuroscience, and ancient metaphysical thought, providing a framework that unifies scientific (...)
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  13. Eliminating Spacetime.Sam Baron - 2021 - Erkenntnis 88 (3):1289-1308.
    A number of approaches to quantum gravity (QG) seem to imply that spacetime does not exist. Philosophers are quick to point out, however, that the loss of spacetime should not be regarded as total. Rather, we should interpret these approaches as ones that threaten the fundamentality but not the existence of spacetime. In this paper, I argue for two claims. First, I argue that spacetime realism is not forced by QG; spacetime eliminativism remains an (...)
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  14. Mereological Models of Spacetime Emergence.Jessica Pohlmann - 2024 - Philosophy Compass 19 (7):e13003.
    Recent work in quantum gravity has prompted a re-evaluation of the fundamental nature of spacetime. Spacetime is potentially emergent from non-spatiotemporal entities posited by a theory of quantum gravity. Recent efforts have sought to interpret the relationship between spacetime and the fundamental entities through a mereological framework. These frameworks propose that spacetime can be conceived as either having non-spatiotemporal entities as its constituents or being a constituent part of a non-spatiotemporal structure. (...)
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  15. Composing Spacetime.Sam Baron & Baptiste Le Bihan - 2022 - Journal of Philosophy 119 (1):33-54.
    According to a number of approaches in theoretical physics, spacetime does not exist fundamentally. Rather, spacetime exists by depending on another, more fundamental, non-spatiotemporal structure. A prevalent opinion in the literature is that this dependence should not be analyzed in terms of composition. We should not say, that is, that spacetime depends on an ontology of non-spatiotemporal entities in virtue of having them as parts. But is that really right? On the contrary, we argue that (...)
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  16. Solved what spacetime is?Alfonso Guillen Gomez - manuscript
    In this essay the author overcomes the theoretical contradiction between General Relativity that defines the gravitational field as a geometric aspect of spacetime, either as potential or curvature, and Quantum Gravity that defines it as a fundamental force of interaction, with the change in the conception of spacetime of structural geometric property from the gravitational field, to the conception of spacetime structural geometric property of matter in motion. Spacetime is not a continent of matter (Substantialism) (...)
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  17. Quantum gravity, timelessness, and the folk concept of time.Andrew J. Latham & Kristie Miller - 2020 - Synthese 198 (10):9453-9478.
    What it would take to vindicate folk temporal error theory? This question is significant against a backdrop of new views in quantum gravity—so-called timeless physical theories—that claim to eliminate time by eliminating a one-dimensional substructure of ordered temporal instants. Ought we to conclude that if these views are correct, nothing satisfies the folk concept of time and hence that folk temporal error theory is true? In light of evidence we gathered, we argue that physical theories that entirely eliminate an (...)
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  18. God and Spacetime.Paul Studtmann - manuscript
    In The Divine Fractal, Studtmann (2021) introduced a novel conception of God, what he calls the symmetry conception, and showed that such a conception not only can be formalized within extensional non-well-founded set theory but also entails the Thomistic view that God is identical to her essence. In this paper, I show that Studtmann’s symmetry conception of God can be integrated into a recent approach to quantum gravity, namely causal set theory. The theory that results has two significant consequences. (...)
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  19. Space Emergence in Contemporary Physics: Why We Do Not Need Fundamentality, Layers of Reality and Emergence.Baptiste Le Bihan - 2018 - Disputatio 10 (49):71-95.
    ‘Space does not exist fundamentally: it emerges from a more fundamental non-spatial structure.’ This intriguing claim appears in various research programs in contemporary physics. Philosophers of physics tend to believe that this claim entails either that spacetime does not exist, or that it is derivatively real. In this article, I introduce and defend a third metaphysical interpretation of the claim: reductionism about space. I argue that, as a result, there is no need to subscribe to fundamentality, layers of reality (...)
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  20.  45
    Cosmic Stretch Theory: A Unified Framework for Spacetime Elasticity.Robert Somazze - manuscript
    Cosmic Stretch Theory (CST) proposes that spacetime possesses inherent elasticity, manifesting across all scales of the universe. This framework provides a unified explanation for various observed phenomena, from quantum effects to cosmological observations, through the fundamental property of spacetime stretching.
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  21. On Spacetime Functionalism.David John Baker - manuscript
    Eleanor Knox has argued that our concept of spacetime applies to whichever structure plays a certain functional role in the laws (the role of determining local inertial structure). I raise two complications for this approach. First, our spacetime concept seems to have the structure of a cluster concept, which means that Knox's inertial criteria for spacetime cannot succeed with complete generality. Second, the notion of metaphysical fundamentality may feature in the spacetime concept, in which case (...) functionalism may be uninformative in the absence of answers to fundamental metaphysical questions like the substantivalist/relationist debate. (shrink)
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  22. Quantum gravity, timelessness, and the contents of thought.David Braddon-Mitchell & Kristie Miller - 2019 - Philosophical Studies 176 (7):1807-1829.
    A number of recent theories of quantum gravity lack a one-dimensional structure of ordered temporal instants. Instead, according to many of these views, our world is either best represented as a single three-dimensional object, or as a configuration space composed of such three-dimensional objects, none of which bear temporal relations to one another. Such theories will be empirically self-refuting unless they can accommodate the existence of conscious beings capable of representation. For if representation itself is impossible in a timeless (...)
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  23. 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 (...)
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  24. (3 other versions)Concatenated quantum gravity papers 1.Paul Merriam & M. A. Z. Habeeb - manuscript
    The first purpose of this series of articles is to introduce case studies on how current AI models can be used in the development of a possible theory of quantum gravity, their limitations, and the role the researcher has in steering the development in the right direction, even highlighting the errors, weaknesses and strengths of the whole process. The second is to introduce the new Presentist Fragmentalist ontology as a framework and use it for developing theories of quantum (...)
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  25. Quantum Gravity and Mereology: Not So Simple.Sam Baron & Baptiste Le Bihan - 2021 - Philosophical Quarterly 72 (1):19-40.
    A number of philosophers have argued in favour of extended simples on the grounds that they are needed by fundamental physics. The arguments typically appeal to theories of quantum gravity. To date, the argument in favour of extended simples has ignored the fact that the very existence of spacetime is put under pressure by quantum gravity. We thus consider the case for extended simples in the context of different views on the existence of spacetime. We show (...)
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  26. 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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  27. Metaphysics of Quantum Gravity.Baptiste Le Bihan, and & Annica Vieser - 2024 - Internet Encyclopedia of Philosophy.
    Metaphysics of Quantum Gravity The metaphysics of quantum gravity explores metaphysical issues related to research programs in theoretical physics clustered under the term quantum gravity. These research programs aim at the formulation of a theory that reconciles the theory of general relativity with quantum theory. The goal is not necessarily to come up with a … Continue reading Metaphysics of Quantum Gravity →.
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  28. Causation as Constraints in Causal Set Theory.Marco Forgione - manuscript
    Many approaches to quantum gravity -the theory that should account for quantum and gravitational phenomena under the same theoretical umbrella- seem to point at some form of spacetime emergence, i.e., the fact that spacetime is not a fundamental entity of our physical world. This tenet has sparked many philosophical discussions: from the so-called empirical incoherence problem to different accounts of emergence and mechanisms thereof. In this contribution, I focus on the partial order relation of causal (...)
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  29. What is spacetime?Alfonso León Guillén Gómez - manuscript
    Based on the Russian school of Logunov and others, with the contribution of Tom van Flandern, and his previous works on space-time, gravitational waves and speed of the gravity, the author discusses the theory of the time-space fluid that results from the supposed gravitational waves that would have detected LIGO, and reaffirms the space-time as a structural geometric property of the dynamic matter (radiation, matter and quantum vacuum), now with the strong argument that without escape, in an unnatural way, (...)
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  30. Background Independence: Lessons for Further Decades of Dispute.Trevor Teitel - 2019 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 65:41-54.
    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 (...)
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  31. Presentism and quantum gravity.Bradley Monton - 2006 - In Dennis Geert Bernardus Johan Dieks (ed.), Ontology of Spacetime. Boston: Elsevier.
    There is a philosophical tradition of arguing against presentism, the thesis that only presently existing things exist, on the basis of its incompatibility with fundamental physics. I grant that presentism is incompatible with special and general relativity, but argue that presentism is not incompatible with quantum gravity, because there are some theories of quantum gravity that utilize a fixed foliation of spacetime. I reply to various objections to this defense of presentism, and point out a flaw in (...)
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  32. Neo-Naturalism, Conciliatory Explanations, and Spatiotemporal Surprises.Uziel Awret - 2019 - Frontiers in Psychology 9.
    Some materialists believe that physics is rich enough to bridge Levine's Explanatory Gap1, while others believe that it is not. Here I promote an intermediate position holding that physics is rich enough to explain why this gap seems more intractable than similar inter-theoretic explanatory gaps, without providing a full-blown “physical” explanation of consciousness. At a minimum, such an approach needs to explore the prospects of empirical discoveries that can diminish the power of anti-physicalist arguments like Chalmers's “conceivability argument”2 and (...)
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  33.  7
    Theory of Harmonic Time (THT): A Speculative Framework.Frances McCloskey - manuscript
    # Theory of Harmonic Time (THT): A Speculative Framework *Disclaimer* This paper presents a highly speculative and theoretical framework, exploring potential connections between harmonic time and various established theories. The ideas discussed herein are hypothetical and require further development, refinement, and experimental verification. *Introduction* The Theory of Harmonic Time (THT) proposes that harmonic oscillations underlie the fundamental nature of time and the universe. This framework attempts to integrate concepts from various theories, including String Theory/M-Theory, Loop Quantum Gravity (LQG), Causal (...)
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  34. Four Attitudes Towards Singularities in the Search for a Theory of Quantum Gravity.Karen Crowther & Sebastian De Haro - 2022 - In Antonio Vassallo (ed.), The Foundations of Spacetime Physics: Philosophical Perspectives. New York, NY: Routledge. pp. 223-250.
    Singularities in general relativity and quantum field theory are often taken not only to motivate the search for a more-fundamental theory (quantum gravity, QG), but also to characterise this new theory and shape expectations of what it is to achieve. Here, we first evaluate how particular types of singularities may suggest an incompleteness of current theories. We then classify four different 'attitudes' towards singularities in the search for QG, and show, through examples in the physics literature, that these (...)
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  35. Is gravity, the curvature of spacetime or a quantum phenomenon.Alfonso Leon Guillen Gomez - 2014 - Journal of Advances in Physics 4 (1):194-203.
    Gravity is the curvature of spacetime, the structural property of static gravitational field, a geometric field, in curved coordinates, according the functions guv, that express geometric relations between material events. Course, general relativity is a relational theory, however, gravity, a thinking category, has symetric physical effects with matter. We use, analitic and critic method of reread the general relativity, since the perspective of the history of the science and the philosophy of the science. Our goal is driver the debate (...)
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  36. Epistemology of Canonical Quantum Gravity - Loop Quantum Gravity.Nicolae Sfetcu - manuscript
    In the interpretation of canonical quantum gravity (CQG), gravity appears as a geometric pseudoforce, is reduced to spacetime geometry and becomes a simple effect of spacetime curvature. The scale at which quantum gravitational effects occur is determined by the different physical constants of fundamental physics: h, c and G, which characterize quantum, relativistic and gravitational phenomena. By combining these constants, we obtain the Planck constants at which the effects of quantum gravity must manifest. Loop (...)
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  37. ARE DARK MATTER AND DARK ENERGY OPPOSITE EFFECTS OF THE QUANTUM VACUUM? Guillen - manuscript
    In the standard model of cosmology, λCDM, were introduced to explain the anomalies of the orbital velocities of galaxies in clusters highest according estimated by General Relativity the dark matter and the accelerated expansion of the universe the dark energy. The model λCDM is based in the equations of the General Relativity that of the total mass-energy of the universe assigns 4.9% to matter (including only baryonic matter), 26.8%, to dark matter and 68.3% to dark energy adjusted according observed in (...)
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  38. A Proposal for a Bohmian Ontology of Quantum Gravity.Antonio Vassallo & Michael Esfeld - 2013 - Foundations of Physics (1):1-18.
    The paper shows how the Bohmian approach to quantum physics can be applied to develop a clear and coherent ontology of non-perturbative quantum gravity. We suggest retaining discrete objects as the primitive ontology also when it comes to a quantum theory of space-time and therefore focus on loop quantum gravity. We conceive atoms of space, represented in terms of nodes linked by edges in a graph, as the primitive ontology of the theory and show how a (...)
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  39. On the Embodiment of Space and Time: Triadic logic, quantum indeterminacy and the metaphysics of relativity.Timothy M. Rogers - manuscript
    Triadic (systemical) logic can provide an interpretive paradigm for understanding how quantum indeterminacy is a consequence of the formal nature of light in relativity theory. This interpretive paradigm is coherent and constitutionally open to ethical and theological interests. -/- In this statement: -/- (1) Triadic logic refers to a formal pattern that describes systemic (collaborative) processes involving signs that mediate between interiority (individuation) and exteriority (generalized worldview or Umwelt). It is also called systemical logic or the logic of relatives. (...)
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  40. ARE DARK MATTER AND DARK ENERGY OPPOSITE EFFECTS OF THE QUANTUM VACUUM?Alfonso Leon Guillen Gomez - manuscript
    In the standard model of cosmology, λCDM, were introduced to explain the anomalies of the orbital velocities of galaxies in clusters highest according estimated by General Relativity the dark matter and the accelerated expansion of the universe the dark energy. The model λCDM is based in the equations of the General Relativity that of the total mass-energy of the universe assigns 4.9% to matter (including only baryonic matter), 26.8%, to dark matter and 68.3% to dark energy adjusted according observed in (...)
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  41. On quantum gravity.Sydney Ernest Grimm - manuscript
    The force of gravity is the result of the creation of matter within vacuum space by the structure of the basic quantum fields. The scalar vectors of the flat Higgs field lost their symmetry and the result are scalar vectors from everywhere around in vacuum space that point in the direction of the created matter. Gravity shows to be a push force and is equal to Newtonian gravity (except the concept of a pull force).
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  42. On Mariátegui’s plural spatiotemporal concept of history.Alejo Stark - 2023 - Consecutio Rerum 7 (13):37-69.
    In what follows, I will provide some elements for constructing Mariátegui’s plural spatiotemporal conception of history. I will do so by focusing on the two books he published in his lifetime: The contemporary scene and Seven Interpretive Essays on Peruvian Reality. In a footnote in the Seven Essays, the reader encounters a concept that opens up the problem of plural temporality in Latin American Marxism: relativismo histórico (historical relativism). This will be the keystone concept upon which certain fragments of (...)
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  43. New Insights on Time and Quantum Gravity.Ozer Oztekin - 2020 - Advances in Physics Theories and Applications 83 (DOI: 10.7176/APTA/83-08).
    According to Einstein, a universal time does not exist. But what if time is different than what we think of it? Cosmic Microvawe Background Radiation was accepted as a reference for a universal clock and a new time concept has been constructed. According to this new concept, time was tackled as two-dimensional having both a wavelength and a frequency. What our clocks measure is actually a derivation of the frequency of time. A relativistic time dilation actually corresponds to an increase (...)
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  44. Russell's 1927 The Analysis of Matter as the First Book on Quantum Gravity.Said Mikki - manuscript
    The goal of this note is to bring into wider attention the often neglected important work by Bertrand Russell on the foundations of physics published in the late 1920s. In particular, we emphasize how the book The Analysis of Matter can be considered the earliest systematic attempt to unify the modern quantum theory, just emerging by that time, with general relativity. More importantly, it is argued that the idea of what I call Russell space, introduced in Part III of (...)
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  45. Defining a crisis: the roles of principles in the search for a theory of quantum gravity.Karen Crowther - 2021 - Synthese 198 (Suppl 14):3489-3516.
    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 (...)
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  46.  48
    On the Motivations for Seeking a Theory of Quantum Gravity.Karen Crowther - 2025 - Journal of Physics: Conference Series 2948 (012002).
    While there are some empirical problems that could suggest the need for a theory of quantum gravity, most of these are not standardly taken as motivations for seeking a new theory. Rather, the quest for a theory of quantum gravity has been primarily motivated, guided, and constrained by philosophical and theoretical concerns. A critical examination of these can help us better understand what the theory is supposed to achieve—and, further, what it should be expected to achieve. On (...)
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  47. New Quantum Spin Perspective of Quantum Gravity and Space-Time of Mind-Stuff.Rakshit Vyas & Mihir Joshi - 2023 - Journal of Applied Consciousness Studies 11 (2):112-19.
    The fundamental building block of the loop quantum gravity (LQG) is the spin network which is used to quantize the physical space-time in the LQG. Recently, the novel quantum spin is proposed using the basic concepts of the spin network. This perspective redefines the notion of the quantum spin and also introduces the novel definition of the reduced Planck constant. The implication of this perspective is not only limited to the quantum gravity; but also found in (...)
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  48. On the construction of the properties of discrete space.Sydney Ernest Grimm - manuscript
    The proposed existence of relative time and the curvature of space – both combined into the concept of spacetime – influences the search for an adequate theoretical model that can describe the structure of space in an accurate way. The aim of building space is to develop a quantum theory of gravitation. This paper investigate the theoretical problems that have their origin in the concepts that are at the basis of phenomenological physics.
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  49. The ontology of General Relativity.Gustavo E. Romero - 2014 - In Mario Novello & Santiago E. Perez Bergliaffa (eds.), Cosmology and Gravitation. Cambridge: Cambridge Scientific Publishers. pp. 177-191.
    I discuss the ontological assumptions and implications of General Relativity. I maintain that General Relativity is a theory about gravitational fields, not about space-time. The latter is a more basic ontological category, that emerges from physical relations among all existents. I also argue that there are no physical singularities in space-time. Singular space-time models do not belong to the ontology of the world: they are not things but concepts, i.e. defective solutions of Einstein’s field equations. I briefly discuss the actual (...)
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  50. (2 other versions)Out of Nowhere: Spacetime from causality: causal set theory.Christian Wüthrich & Nick Huggett - 2023
    This is a chapter of the planned monograph "Out of Nowhere: The Emergence of Spacetime in Quantum Theories of Gravity", co-authored by Nick Huggett and Christian Wüthrich and under contract with Oxford University Press. (More information at www<dot>beyondspacetime<dot>net.) This chapter introduces causal set theory and identifies and articulates a 'problem of space' in this theory.
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