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    Wyświetlanie 1-4 z 4
    Tytuł:
    Does time exist in quantum gravity?
    Autorzy:
    Kiefer, Claus
    Powiązania:
    https://bibliotekanauki.pl/articles/690788.pdf
    Data publikacji:
    2015
    Wydawca:
    Copernicus Center Press
    Tematy:
    cosmology
    arrow of time
    entropy
    quantum gravity
    Opis:
    Time is absolute in standard quantum theory and dynamical in general relativity. The combination of both theories into a theory of quantum gravity leads therefore to a “problem of time”. In my essay, I investigate those consequences for the concept of time that may be drawn without a detailed knowledge of quantum gravity. The only assumptions are the experimentally supported universality of the linear structure of quantum theory and the recovery of general relativity in the classical limit. Among the consequences are the fundamental timelessness of quantum gravity, the approximate nature of a semiclassical time, and the correlation of entropy with the size of the Universe.
    Źródło:
    Zagadnienia Filozoficzne w Nauce; 2015, 59; 7-24
    0867-8286
    2451-0602
    Pojawia się w:
    Zagadnienia Filozoficzne w Nauce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Does the quantum mechanical wave function exist?
    Autorzy:
    Kiefer, Claus
    Powiązania:
    https://bibliotekanauki.pl/articles/690936.pdf
    Data publikacji:
    2019
    Wydawca:
    Copernicus Center Press
    Tematy:
    wave function
    quantum mechanics
    ontology
    quantum formalism
    superposition principle
    measurement problem
    decoherence
    quantum gravity
    Opis:
    I address the question whether the wave function in quantum theory exists as a real (ontic) quantity or not. For this purpose, I discuss the essentials of the quantum formalism and emphasize the central role of the superposition principle. I then explain the measurement problem and discuss the process of decoherence. Finally, I address the special features that the quantization of gravity brings into the game. From all of this I conclude that the wave function really exists, that is, it is a real (ontic) feature of Nature.
    Źródło:
    Zagadnienia Filozoficzne w Nauce; 2019, 66; 111-128
    0867-8286
    2451-0602
    Pojawia się w:
    Zagadnienia Filozoficzne w Nauce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum geometry, logic and probability
    Autorzy:
    Majid, Shahn
    Powiązania:
    https://bibliotekanauki.pl/articles/1047619.pdf
    Data publikacji:
    2020-12-29
    Wydawca:
    Copernicus Center Press
    Tematy:
    logic
    noncommutative geometry
    digital geometry
    quantum gravity
    duality
    power set
    Heyting algebra
    Opis:
    Quantum geometry on a discrete set means a directed graph with a weight associated to each arrow defining the quantum metric. However, these ‘lattice spacing’ weights do not have to be independent of the direction of the arrow. We use this greater freedom to give a quantum geometric interpretation of discrete Markov processes with transition probabilities as arrow weights, namely taking the diffusion form ∂+f = (−Δθ + q − p)f for the graph Laplacian Δθ, potential functions q, p built from the probabilities, and finite difference ∂+ in the time direction. Motivated by this new point of view, we introduce a ‘discrete Schrödinger process’ as ∂+ψ = ı(−Δ + V )ψ for the Laplacian associated to a bimodule connection such that the discrete evolution is unitary. We solve this explicitly for the 2-state graph, finding a 1-parameter family of such connections and an induced ‘generalised Markov process’ for f = |ψ|2 in which there is an additional source current built from ψ. We also mention our recent work on the quantum geometry of logic in ‘digital’ form over the field F2 = {0, 1}, including de Morgan duality and its possible generalisations.
    Źródło:
    Zagadnienia Filozoficzne w Nauce; 2020, 69; 191-236
    0867-8286
    2451-0602
    Pojawia się w:
    Zagadnienia Filozoficzne w Nauce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Granice fizyki w kosmologii
    Limits of physics in cosmology
    Autorzy:
    Sokołowski, Leszek M.
    Powiązania:
    https://bibliotekanauki.pl/articles/690790.pdf
    Data publikacji:
    2015
    Wydawca:
    Copernicus Center Press
    Tematy:
    physical cosmology
    the notion of the Universe
    dark matter and dark energy
    falsifiability of quantum gravity
    origin of the Universe
    Opis:
    The message is that physics has an „outward bound” of scientific inquiry in the field of cosmology. I present it in the historical development. Physics and astronomy, developing since the seventeenth century, inherited from the early Greek philosophers the conception that the Universe as a whole is invariable. In nineteenth century this conception in conjunction with the conception of eternity of the Universe (being a philosophical conclusion from the conservation laws of mass and energy) gave rise to contradictions with other laws of physics indicating that cosmology is not a branch of physics since the notion of the Universe is not a physical one. Cosmology returned to physics as its important branch due to the advent of general relativity theory and the discovery of the cosmic microwave background radiation. Modern cosmology generates fundamental problems creating real limits to inquiries in physics viewed as an empirical science. The very notion of the Universe shows that the scientific method reaches there limits of its applicability. Does „to exist” mean „to be observed by someone”? Should the definition of the Universe be based on a current physical theory, e.g. on Einstein’s general relativity, giving rise to a kind of mathematical instability? Is the fashionable concept of the „multiverse” a physical one or is a purely metaphysical notion in a scientific disguise? If the Universe is unique (as we believe), is it meaningful to describe it in the framework of physics, which by its method always assumes that the number of objects it describes, is unlimited? Apart from these permanent philosophical problems there are concrete urgent problems generated by cosmology: the nature of dark matter and dark energy. These two species of „substance” appear only in cosmology and do not fit the laboratory physics; contrary to the three centuries long tradition of modern science, now cosmology inspires physics in a troublesome way. A separate class of limits to physics is generated by the theorem in general relativity that the Universe emerged from an initial curvature singularity of the spacetime. At the singularity the whole scientific inquiry breaks down. Cosmology of the very early Universe suggests that in its evolution two specific epochs took place, that of quantum gravity and an inflationary epoch. The underlying them two physical theories are incomplete and seem to be inherently untestable. Furthermore, the experimentally verifiable physics cannot explain the origin of the initial conditions determining properties of the Universe which emerged from the singularity.
    Źródło:
    Zagadnienia Filozoficzne w Nauce; 2015, 59; 25-81
    0867-8286
    2451-0602
    Pojawia się w:
    Zagadnienia Filozoficzne w Nauce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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