Results for 'Wheeler-DeWitt equation'

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  1.  39
    The Wheeler-DeWitt equation and the path integral in minisuperspace quantum cosmology.J. J. Halliwell - 1991 - In A. Ashtekar & J. Stachel (eds.), Conceptual Problems of Quantum Gravity. Birkhauser. pp. 1--75.
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  2. Finding Time for Wheeler-DeWitt Cosmology.Nick Huggett & Karim Thebault - manuscript
    We conduct a case study analysis of a proposal for the emergence of time based upon the approximate derivation of three grades of temporal structure within an explicit quantum cosmological model which obeys a Wheeler-DeWitt type equation without an extrinsic time parameter. Our main focus will be issues regarding the consistency of the approximations and derivations in question. Our conclusion is that the model provides a self-consistent account of the emergence of chronordinal, chronometric and chronodirected structure. Residual (...)
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  3. Information, physics, quantum: the search for links.John Archibald Wheeler - 1989 - In Proceedings III International Symposium on Foundations of Quantum Mechanics. Tokyo: pp. 354-358.
    This report reviews what quantum physics and information theory have to tell us about the age-old question, How come existence? No escape is evident from four conclusions: (1) The world cannot be a giant machine, ruled by any preestablished continuum physical law. (2) There is no such thing at the microscopic level as space or time or spacetime continuum. (3) The familiar probability function or functional, and wave equation or functional wave equation, of standard quantum theory provide mere (...)
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  4.  47
    Wedges I.Cécile DeWitt-Morette, Stephen G. Low, Lawrence S. Schulman & Anwar Y. Shiekh - 1986 - Foundations of Physics 16 (4):311-349.
    The wedge problem, that is, the propagation of radiation or particles in the presence of a wedge, is examined in different contexts. Generally, the paper follows the historical order from Sommerfeld's early work to recent stochastic results—hindsights and new results being woven in as appropriate. In each context, identifying the relevant mathematical problem has been the key to the solution. Thus each section can be given both a physics and a mathematics title: Section 2: diffraction by reflecting wedge; boundary value (...)
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  5. Humeanism and Exceptions in the Fundamental Laws of Physics.Billy Wheeler - 2017 - Principia: An International Journal of Epistemology 21 (3):317-337.
    It has been argued that the fundamental laws of physics do not face a ‘problem of provisos’ equivalent to that found in other scientific disciplines (Earman, Roberts and Smith 2002) and there is only the appearance of exceptions to physical laws if they are confused with differential equations of evolution type (Smith 2002). In this paper I argue that even if this is true, fundamental laws in physics still pose a major challenge to standard Humean approaches to lawhood, as they (...)
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  6.  55
    String Without Strings.James T. Wheeler - 2000 - Foundations of Physics 30 (7):1017-1091.
    Scale invariance provides a principled reason for the physical importance of Hilbert space, the Virasoro algebra, the string mode expansion, canonical commutators and Schrödinger evolution of states, independent of the assumptions of string theory and quantum theory. The usual properties of dimensionful fields imply an infinite, projective tower of conformal weights associated with the tangent space to scale-invariant spacetimes. Convergence and measurability on this tangent tower are guaranteed using a scale-invariant norm, restricted to conformally self-dual vectors. Maps on the resulting (...)
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  7.  4
    The Religious Qualities of Naturalistic God Metaphors: Introducing the Debate.Demian Wheeler & Daniel J. Ott - 2021 - American Journal of Theology and Philosophy 42 (1):5-7.
    What follows is a continuation of a debate that dates back to at least John Calvin and Jacobus Arminius but took on its naturalistic guise in the third generation of the Chicago school between Bernard Loomer and Bernard Meland. Basically, the argument pertains to whether God is to be associated with everything that is, including suffering and evil, or whether God is more rightly associated with what we take to be good or redemptive. Loomer defended the former position. Late in (...)
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  8.  36
    On Gravitational Effects in the Schrödinger Equation.M. D. Pollock - 2014 - Foundations of Physics 44 (4):368-388.
    The Schrödinger equation for a particle of rest mass $m$ and electrical charge $ne$ interacting with a four-vector potential $A_i$ can be derived as the non-relativistic limit of the Klein–Gordon equation $\left( \Box '+m^2\right) \varPsi =0$ for the wave function $\varPsi $ , where $\Box '=\eta ^{jk}\partial '_j\partial '_k$ and $\partial '_j=\partial _j -\mathrm {i}n e A_j$ , or equivalently from the one-dimensional action $S_1=-\int m ds +\int neA_i dx^i$ for the corresponding point particle in the semi-classical approximation (...)
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  9.  99
    T Violation and the Unidirectionality of Time.Joan A. Vaccaro - 2011 - Foundations of Physics 41 (10):1569-1596.
    An increasing number of experiments at the Belle, BNL, CERN, DAΦNE and SLAC accelerators are confirming the violation of time reversal invariance (T). The violation signifies a fundamental asymmetry between the past and future and calls for a major shift in the way we think about time. Here we show that processes which violate T symmetry induce destructive interference between different paths that the universe can take through time. The interference eliminates all paths except for two that represent continuously forwards (...)
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  10. Perspectives of the Numerical Order of Material Changes in Timeless Approaches in Physics.Davide Fiscaletti & Amrit Sorli - 2015 - Foundations of Physics 45 (2):105-133.
    WheelerdeWitt equation as well as some relevant current research (Chiou’s timeless path integral approach for relativistic quantum mechanics; Palmer’s view of a fundamental level of physical reality based on an Invariant Set Postulate; Girelli’s, Liberati’s and Sindoni’s toy model of a non-dynamical timeless space as fundamental background of physical events) suggest that at a fundamental level the background space of physics is timeless, that the duration of physical events has not a primary existence. By taking into consideration (...)
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  11.  59
    Quantum Analysis of $$k=-1$$ k = - 1 Robertson–Walker Universe.Ciprian Dariescu & Marina-Aura Dariescu - 2015 - Foundations of Physics 45 (11):1495-1513.
    The \\)-Robertson–Walker spacetime is under investigation. With the derived Hamilton operator, we are solving the Wheeler–De Witt Equation and its Schrödinger-like extension, for physically important forms of the effective potential. The closed form solutions, expressed in terms of Heun’s functions, allow us to comment on the occurrence of Universe from highly probable quantum states.
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  12.  44
    Realistic Clocks for a Universe Without Time.K. L. H. Bryan & A. J. M. Medved - 2018 - Foundations of Physics 48 (1):48-59.
    There are a number of problematic features within the current treatment of time in physical theories, including the “timelessness” of the Universe as encapsulated by the WheelerDeWitt equation. This paper considers one particular investigation into resolving this issue; a conditional probability interpretation that was first proposed by Page and Wooters. Those authors addressed the apparent timelessness by subdividing a faux Universe into two entangled parts, “the clock” and “the remainder of the Universe”, and then synchronizing the effective (...)
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  13.  50
    Quantum gravity, the origin of time and time's arrow.J. W. Moffat - 1993 - Foundations of Physics 23 (3):411-437.
    The local Lorentz and diffeomorphism symmetries of Einstein's gravitational theory are spontaneously broken by a Higgs mechanism by invoking a phase transition in the early universe, at a critical temperature Tc below which the symmetry is restored. The spontaneous breakdown of the vacuum state generates an external time, and the wave function of the universe satisfies a time-dependent Schrödinger equation, which reduces to the Wheeler-deWitt equation in the classical regime for T (...)
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  14. 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 non-local law in which (...)
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  15.  9
    Mathematical Models of Time as a Heuristic Tool.Emiliano Ippoliti - 2006 - In Lorenzo Magnani & Claudia Casadio (eds.), Model Based Reasoning in Science and Technology. Logical, Epistemological, and Cognitive Issues. Springer Verlag.
    This paper sets out to show how mathematical modelling can serve as a way of ampliating knowledge. To this end, I discuss the mathematical modelling of time in theoretical physics. In particular I examine the construction of the formal treatment of time in classical physics, based on Barrow’s analogy between time and the real number line, and the modelling of time resulting from the Wheeler-DeWitt equation. I will show how mathematics shapes physical concepts, like time, acting as (...)
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  16.  80
    Time in Quantum Physics: From an External Parameter to an Intrinsic Observable. [REVIEW]Romeo Brunetti, Klaus Fredenhagen & Marc Hoge - 2010 - Foundations of Physics 40 (9-10):1368-1378.
    In the Schrödinger equation, time plays a special role as an external parameter. We show that in an enlarged system where the time variable denotes an additional degree of freedom, solutions of the Schrödinger equation give rise to weights on the enlarged algebra of observables. States in the associated GNS representation correspond to states on the original algebra composed with a completely positive unit preserving map. Application of this map to the functions of the time operator on the (...)
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  17.  47
    Symmetry and Evolution in Quantum Gravity.Sean Gryb & Karim Thébaault - 2014 - Foundations of Physics 44 (3):305-348.
    We propose an operator constraint equation for the wavefunction of the Universe that admits genuine evolution. While the corresponding classical theory is equivalent to the canonical decomposition of General Relativity, the quantum theory contains an evolution equation distinct from standard WheelerDeWitt cosmology. Furthermore, the local symmetry principle—and corresponding observables—of the theory have a direct interpretation in terms of a conventional gauge theory, where the gauge symmetry group is that of spatial conformal diffeomorphisms (that preserve the spatial (...)
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  18.  22
    Bouncing Unitary Cosmology I. Mini-Superspace General Solution.Sean Gryb & Karim Thebault - unknown
    We offer a new proposal for cosmic singularity resolution based upon a quantum cosmology with a unitary bounce. This proposal is illustrated via a novel quantization of a mini-superspace model in which there can be superpositions of the cosmological constant. This possibility leads to a finite, bouncing unitary cosmology. Whereas the usual WheelerDeWitt cosmology generically displays pathological behaviour in terms of non-finite expectation values and non-unitary dynamics, the finiteness and unitarity of our model are formally guaranteed. For classically (...)
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  19.  74
    It’s Déjà Vu All Over Again: A Classical Interpretation of Syntropy and Precognitive Interdiction Based on Wheeler-Feynman’s Absorber Theory.Victor Christianto, Florentin Smarandache & Yunita Umniyati - manuscript
    It has been known for long time that intuition plays significant role in many professions and human life, including in entrepreneurship, government, and also in detective or law enforcement activities. Even women are known to possess better intuitive feelings or “hunch” compared to men. Despite these examples, such a precognitive interdiction is hardly accepted in established science. In this paper, we discuss briefly the advanced solutions of Maxwell equations, and then make connection between syntropy and precognition from classical perspective. It (...)
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  20.  11
    Schrödinger’s Equation as a Consequence of the Central Limit Theorem Without Assuming Prior Physical Laws.P. M. Grinwald - 2022 - Foundations of Physics 52 (2):1-22.
    The central limit theorem has been found to apply to random vectors in complex Hilbert space. This amounts to sufficient reason to study the complex–valued Gaussian, looking for relevance to quantum mechanics. Here we show that the Gaussian, with all terms fully complex, acting as a propagator, leads to Schrödinger’s non-relativistic equation including scalar and vector potentials, assuming only that the norm is conserved. No physical laws need to be postulated a priori. It thereby presents as a process of (...)
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  21. Moving Beyond Sets of Probabilities.Gregory Wheeler - 2021 - Statistical Science 36 (2):201--204.
    The theory of lower previsions is designed around the principles of coherence and sure-loss avoidance, thus steers clear of all the updating anomalies highlighted in Gong and Meng's "Judicious Judgment Meets Unsettling Updating: Dilation, Sure Loss, and Simpson's Paradox" except dilation. In fact, the traditional problem with the theory of imprecise probability is that coherent inference is too complicated rather than unsettling. Progress has been made simplifying coherent inference by demoting sets of probabilities from fundamental building blocks to secondary representations (...)
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  22. From robots to rothko: The bringing forth of worlds.Michael Wheeler - 1996 - In Margaret A. Boden (ed.), The philosophy of artificial life. New York: Oxford University Press. pp. 209-236.
     
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  23.  63
    Traits, Genes, and Coding.Michael Wheeler - 1998 - In Michael Ruse (ed.), Philosophy of biology. Amherst, N.Y.: Prometheus Books. pp. 369--401.
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  24.  11
    Fundamental problems in quantum theory: a conference held in honor of Professor John A. Wheeler.John Archibald Wheeler, Daniel M. Greenberger & Anton Zeilinger (eds.) - 1995 - New York: New York Academy of Sciences.
    Ed. Daniel Greenberger, 750pp May 1995 164.95.
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  25.  44
    Quine, Davidson, Relative Essentialism and the Question of Being.Samuel C. Wheeler - 2018 - Open Philosophy 1 (1):115-128.
    Relative essentialism, the view that multiple objects about which there are distinct de re modal truths can occupy the same space at the same time, is a metaphysical view that dissolves a number of metaphysical issues. The present essay constructs and defends relative essentialism and argues that it is implicit in some of the ideas of W. V. Quine and Donald Davidson. Davidson’s published views about individuation and sameness can accommodate the common-sense insights about change and persistence of Aristotle and (...)
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  26.  28
    Semantic priming without awareness: Some methodological considerations and implications.S. M. Kemp-Wheeler & A. B. Hill - 1988 - Quarterly Journal of Experimental Psychology 40.
  27. Research and evaluation in music therapy.Barbara Wheeler - 2008 - In Susan Hallam, Ian Cross & Michael Thaut (eds.), Oxford Handbook of Music Psychology. Oxford University Press.
     
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  28.  10
    Being measured: truth and falsehood in Aristotle's Metaphysics.Mark Richard Wheeler - 2019 - Albany, New York: State University of New York Press.
    On the basis of careful textual exegesis and philosophical analysis, and contrary to the received view, Mark R. Wheeler demonstrates that Aristotle presents and systematically explicates his definition of the essence of the truth in the Metaphysics. Aristotle states the nominal definitions of the terms "truth" and "falsehood" as part of his arguments in defense of the logical axioms. These nominal definitions express conceptions of truth and falsehood his philosophical opponents would have recognized and accepted in the context of (...)
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  29. Coherence and Confirmation through Causation.Gregory Wheeler & Richard Scheines - 2013 - Mind 122 (485):135-170.
    Coherentism maintains that coherent beliefs are more likely to be true than incoherent beliefs, and that coherent evidence provides more confirmation of a hypothesis when the evidence is made coherent by the explanation provided by that hypothesis. Although probabilistic models of credence ought to be well-suited to justifying such claims, negative results from Bayesian epistemology have suggested otherwise. In this essay we argue that the connection between coherence and confirmation should be understood as a relation mediated by the causal relationships (...)
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  30. Anita the agitator.Philip Elmer-Dewitt - 1993 - In Jonathan Westphal & Carl Avren Levenson (eds.), Time. Hackett Pub. Co.. pp. 141--52.
     
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  31. Building the on-ramp to the electronic highway.Philip Elmer-Dewitt - 1993 - In Jonathan Westphal & Carl Avren Levenson (eds.), Time. Hackett Pub. Co.. pp. 141--52.
     
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  32.  53
    Cloning: where do we draw the line?Philip Elmer-Dewitt - 1993 - In Jonathan Westphal & Carl Avren Levenson (eds.), Time. Hackett Pub. Co.. pp. 142--19.
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  33. Orgies on line.P. Elmer-Dewitt - 1993 - In Jonathan Westphal & Carl Avren Levenson (eds.), Time. Hackett Pub. Co.. pp. 141--63.
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  34. The amazing video game boom.Philip Elmer-Dewitt - 1993 - In Jonathan Westphal & Carl Avren Levenson (eds.), Time. Hackett Pub. Co.. pp. 142--13.
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  35.  19
    Semantic and emotional priming below objective detection threshold.S. M. Kemp-Wheeler & A. B. Hill - 1992 - Cognition and Emotion 6 (2):113-128.
  36.  20
    Epicurus and His Philosophy.Philip Merlan & Norman Wentworth DeWitt - 1955 - Philosophical Review 64 (1):140.
  37.  12
    Ethics and Language.DeWitt H. Parker - 1946 - Philosophical Review 55 (6):704.
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  38.  37
    Aristotle on Truth (review).Mark Richard Wheeler - 2006 - Journal of the History of Philosophy 44 (3):469-470.
    Mark Richard Wheeler - Aristotle on Truth - Journal of the History of Philosophy 44:3 Journal of the History of Philosophy 44.3 469-470 Paolo Crivelli. Aristotle on Truth. Cambridge-New York: Cambridge University Press, 2004. Pp. xi + 340. Cloth, $85.00. A thorough contemporary study of Aristotle's theory of truth is welcome. Adopting a frankly analytic approach, Professor Crivelli addresses all of the most important Aristotelian texts on truth. He provides close and careful exegesis, attending to philological and interpretive difficulties (...)
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  39.  33
    Alcohol increases hypnotic susceptibility.Rebecca Semmens-Wheeler, Zoltán Dienes & Theodora Duka - 2013 - Consciousness and Cognition 22 (3):1082-1091.
    One approach to hypnosis suggests that for hypnotic experience to occur frontal lobe activity must be attenuated. For example, cold control theory posits that a lack of awareness of intentions is responsible for the experience of involuntariness and/or the subjective reality of hypnotic suggestions. The mid-dorso-lateral prefrontal cortex and the ACC are candidate regions for such awareness. Alcohol impairs frontal lobe executive function. This study examined whether alcohol affects hypnotisability. We administered 0.8 mg/kg of alcohol or a placebo to 32 (...)
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  40.  10
    Mind in Nature.John Archibald Wheeler - 1982 - HarperCollins Publishers.
    Examines the philosophical, scientific, and theological aspects of the character of the human mind.
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  41.  3
    An evaluation of a computational model of lexical access: Comment on Dell et al. (1997).Wheeler Ruml & Alfonso Caramazza - 2000 - Psychological Review 107 (3):609-634.
  42.  35
    A Sense of ‘Special Connection’, Self-transcendent Values and a Common Factor for Religious and Non-religious Spirituality.Philippa Wheeler, Kevin S. Masters, Michael E. Hyland & Shanmukh Kamble - 2010 - Archive for the Psychology of Religion 32 (3):293-326.
    We examined the hypothesis that a tendency to experience the world in terms of a sense of ‘special’ connection is responsible for the self-transcendent value dimension identified by multi-dimensional scaling and constitutes a common factor for different religious and non-religious interpretations of spirituality. Eight different groups were studied including: six different types of faith leaders in India and the UK, people who self-rated as spiritual but not religious, and those self-rating as neither spiritual nor religious. They completed a questionnaire that (...)
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  43.  28
    Does the topology of space fluctuate?Arlen Anderson & Bryce DeWitt - 1986 - Foundations of Physics 16 (2):91-105.
    Evidence is presented that the singularities induced in causal Lorentzian spacetimes by changes in 3-space topology give rise to infinite particle and energy production under reasonable laws of quantum field propagation. In the case of the gravitational field, if 3-space is compact the total energy must vanish. A topological transition therefore induces a violent collapse that effectively aborts the transition, since the collapse mode is the only mode carrying the negative energy needed to compensate the associated infinite energy production. The (...)
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  44.  25
    Darwinism and the cultural evolution of sports.Andreas De Block & Siegfried Dewitte - 2008 - Perspectives in Biology and Medicine 52 (1):1-16.
    Evolutionary theory has gained some ground in the social sciences, but not without resistance. It must be said that at least some of the resistance on the part of social scientists is justified insofar as social and cultural phenomena such as sports are often much more complex than many evolutionary theorists seem to think. We propose in this paper an evolutionary approach to sports that takes into account its profoundly cultural character, thereby overcoming the traditional nature-culture dichotomies in the sociology (...)
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  45. The Temptation of the Undifferentiated. From the World Without Qualities to the Man Without Qualities.Jacques Dewitte - 2002 - Diogenes 49 (195):67-70.
    My topic will be philosophical and, more precisely still, ontological. If we wish to conceive of what is at stake in the ‘dehumanization of the world’ and if we want to oppose it, we need to widen our perspective and take in not only the destiny of the human but the status of things and beings in general.The thesis I am going to put forward, which is still quite daring given the current stage of my thinking, is a hunch and (...)
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  46.  17
    Review essay / sentencing matters.Stanton Wheeler - 1997 - Criminal Justice Ethics 16 (2):46-51.
    Michael Tonry, Sentencing Matters (New York: Oxford University Press, 1996, 240pp.
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  47. A Sequential Science of Government.Dennis Dewitt Brane - 1935 - Philosophical Review 44:504.
     
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  48.  15
    Religion in Greek Literature.Benj Ide Wheeler - 1899 - Philosophical Review 8 (6):622-627.
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  49. The Sign of the Hand: Symbolic Practices and the Extended Mind.Massimiliano Cappuccio & Michael Wheeler - 2011 - Versus 113:33-56.
     
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  50.  12
    Review of Clifford L. Barrett: Contemporary Idealism in America[REVIEW]DeWitt H. Parker - 1933 - International Journal of Ethics 43 (4):444-447.
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