Academic literature on the topic 'Quantum Gravity and Time'

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Journal articles on the topic "Quantum Gravity and Time"

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K, Kabe. "How Quantum is Quantum Gravity?" Physical Science & Biophysics Journal 7, no. 1 (2023): 1–4. http://dx.doi.org/10.23880/psbj-16000244.

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Nature does not compartmentalize its happenings into different theories or disciplines. The theories are put forth by us to approximately understand the finer workings of nature. All theories are mere mathematical models built to understand nature. Any or all of them can be superseded by a better model or combination of models. The current paper analyses the formulation of Planck scale quantities, the workings of the temporal gauge, the concept of time other related fundamental issues. In particular, the paper points out that the force at the Planck scale is non-quantum.
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BISWAS, S., A. SHAW, and B. MODAK. "TIME IN QUANTUM GRAVITY." International Journal of Modern Physics D 10, no. 04 (2001): 595–606. http://dx.doi.org/10.1142/s0218271801001384.

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The Wheeler–DeWitt equation in quantum gravity is timeless in character. In order to discuss quantum to classical transition of the universe, one uses a time prescription in quantum gravity to obtain a time contained description starting from Wheeler–DeWitt equation and WKB ansatz for the WD wavefunction. The approach has some drawbacks. In this work, we obtain the time-contained Schrödinger–Wheeler–DeWitt equation without using the WD equation and the WKB ansatz for the wavefunction. We further show that a Gaussian ansatz for SWD wavefunction is consistent with the Hartle–Hawking or wormhole
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Unruh, W. G. "Time and quantum gravity." International Journal of Theoretical Physics 28, no. 9 (1989): 1181–93. http://dx.doi.org/10.1007/bf00670359.

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Zeh, H. D. "Time in quantum gravity." Physics Letters A 126, no. 5-6 (1988): 311–17. http://dx.doi.org/10.1016/0375-9601(88)90842-0.

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Kiefer, Claus, and Patrick Peter. "Time in Quantum Cosmology." Universe 8, no. 1 (2022): 36. http://dx.doi.org/10.3390/universe8010036.

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Time in quantum gravity is not a well-defined notion despite its central role in the very definition of dynamics. Using the formalism of quantum geometrodynamics, we briefly review the problem and illustrate it with two proposed solutions. Our main application is quantum cosmology—the application of quantum gravity to the Universe as a whole.
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AMELINO-CAMELIA, GIOVANNI, NICCOLÒ LORET, GIANLUCA MANDANICI, and FLAVIO MERCATI. "GRAVITY IN QUANTUM SPACE–TIME." International Journal of Modern Physics D 19, no. 14 (2010): 2385–92. http://dx.doi.org/10.1142/s0218271810018451.

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The literature on quantum-gravity-inspired scenarios for the quantization of space–time has so far focused on particle-physics-like studies. This is partly justified by the present limitations of our understanding of quantum gravity theories, but we here argue that valuable insight can be gained through semi-heuristic analyses of the implications for gravitational phenomena of some results obtained in the quantum space–time literature. In particular, we show that the types of description of particle propagation that emerged in certain quantum space–time frameworks have striking implications fo
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Guts, A. K. "Quantum Time Machine and Loop Quantum Gravity." Mathematical structures and modeling, no. 3 (2018): 4–14. http://dx.doi.org/10.24147/2222-8772.2018.3.4-14.

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A description of a quantum time machine that performs intertemporal transitions is given within the framework of loop quantum gravity. Unlike quantum geometrodynamics, in this case it becomes clear how to produce effects that change modern geometry to the past.
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Castagnino, Mario. "Probabilistic time in quantum gravity." Physical Review D 39, no. 8 (1989): 2216–28. http://dx.doi.org/10.1103/physrevd.39.2216.

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Itzhaki, N. "Time measurement in quantum gravity." Physics Letters B 328, no. 3-4 (1994): 274–76. http://dx.doi.org/10.1016/0370-2693(94)91479-6.

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R, Iyer. "Scalar Metrics Tensor Gradation Rank-n Quantum Gravity Physics." Open Access Journal of Astronomy 3, no. 1 (2025): 1–19. https://doi.org/10.23880/oaja-16000155.

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In this paper, logical and novel approach in quantifying and scalarizing tensor metrics quantum gravity with rank gradation process of interactively coupled phenomena of gravity, time, space-time, quanta, and fields domains have been thoroughly analyzed mathematically. The author advances the theory of quantum gravity by integrating gravity and tensor time metrics, building on emergent theories such as Loop Quantum Gravity (LQG). LQG suggests that spacetime is quantized at the smallest scales, with gravity and spacetime geometry emerging from the quantum states of the gravitational field. This
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Dissertations / Theses on the topic "Quantum Gravity and Time"

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Arzano, Michele Ng Yee Jack. "Aspects of quantum gravity quantum space-time and black hole thermodynamics /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,144.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.<br>Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics & Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.
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Jacobson, David. "Spectral modulation, gravity and time-dependent correlations in neutron interferometry /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9720550.

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Crystal, Lisa. "Quantum Times: Physics, Philosophy, and Time in the Postwar United States." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10973.

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The concept of time in physics underwent significant changes in the decades following World War II. This dissertation considers several ways in which American physicists grappled with these changes, analyzing the extent to which philosophical methods and questions played a role in physicists' engagement with time. Two lines of questioning run through the dissertation. The first asks about the professional identities of postwar American physicists in relation to philosophy, as exemplified by their engagement with the concept of time. The second analyzes the heterogeneous nature of time in physi
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Wells, Clive Gene. "The application of differential geometry to classical and quantum gravity." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/283187.

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Hersent, Kilian. "Field theories on quantum space-times : towards the phenomenology of quantum gravity." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP031.

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La géométrie noncommutative est un formalisme mathématique qui exprime la structure de l’espace-temps avec des algèbres d’opérateurs. On s’attend à ce que les espace-temps noncommutatifs fassent émerger des effets de gravité quantiques, au moins dans un certain régime, notamment parce qu’ils utilisent les outils de la mécanique quantique pour décrire la géométrie. Ce manuscrit se concentre sur les aspects physiques de ces espace-temps quantiques, tout particulièrement à travers le formalisme des théories de champs et de jauge. Il est montré que les théories de champs scalaires engendrent possi
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Pérez, Rodríguez Jeinny Nallely. "A study of the problem of time in a Friedmann quantum cosmology." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21716/.

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After reviewing Dirac's canonical quantization program and the canonical quantization of General Relativity, we study the problem of time in the context of a quantum minisuperspace cosmological model: a Friedmann-Lemaître-Robertson-Walker spacetime coupled minimally to a scalar field. We explore different methods to include time and evolution in our formalism. We begin by discussing the possibility to identify a dynamical time variable before quantization. Such a time variable is constructed as a function of the phase space variables and leads to a multiple choice problem for the evolution of
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Neri, Giulio. "Effective metric for bootstrapped Newtonian sources." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21717/.

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In this work, we address the problem of constructing an effective space-time picture for the gravitational field in the bootstrapped Newtonian theory (BNT). After a short review of the singularity problem and the corpuscular model of black holes, we present a detailed introduction to the BNT. This theory provides us with an exact formula for the gravitational potential felt by slowly-moving particles outside a static and spherically symmetric source. Our goal is to determine the most general metric tensor that reproduces this potential in the Newtonian limit and use it in relativistic or stro
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Dempsey, Patrick. "On the Compatibility of Presentism and our most fundamental Physics." Thesis, Department of Philosophy, 2013. http://hdl.handle.net/2123/10247.

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It has been alleged that Presentism is incompatible with our most fundamental physics. More specifically, it is argued that this follows from the fact that Presentism and The Special Theory of Relativity are incompatible. The aim of this thesis is to assess whether the Presentist can refute this argument. I shall argue that whilst it is problematic for the Presentist to dispute the claim that their theory is incompatible with The Special Theory of Relativity, they can successfully refute the argument that their theory is therefore incompatible with our most fundamental theories of physics. My
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Davis, Simon. "The quantum cosmological wavefunction at very early times for a quadratic gravity theory." Universität Potsdam, 2003. http://opus.kobv.de/ubp/volltexte/2008/2652/.

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The quantum cosmological wavefunction for a quadratic gravity theory derived from the heterotic string effective action is obtained near the inflationary epoch and during the initial Planck era. Neglecting derivatives with respect to the scalar field, the wavefunction would satisfy a third-order differential equation near the inflationary epoch which has a solution that is singular in the scale factor limit a(t) → 0. When scalar field derivatives are included, a sixth-order differential equation is obtained for the wavefunction and the solution by Mellin transform is regular in the a → 0 limit
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PINNA, SIMONLUCA. "Time in Nicolai Hartmann's philosophy." Doctoral thesis, Università degli Studi di Cagliari, 2014. http://hdl.handle.net/11584/266498.

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The present work is divided into two parts. The first (only in Italian) is an analysis of some texts about time in Nicolai Hartmann's works, and especially in Möglichkeit und Wirklichkeit (1938) and Philosophie der Natur (1950). The second part is a theoretical discussion of one of the main problems concerning time in the contemporary philosophy (and in the philosophy of physics in particular), i.e., the problem of the unreality of time. Some recent theses will be compared and analyzed in the light of Hartmann's critical ontology. The scope of Part II is to evaluate whether and how Hartm
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Books on the topic "Quantum Gravity and Time"

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Sato, Yuki. Space-Time Foliation in Quantum Gravity. Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54947-5.

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Carlip, Steven. Quantum gravity in 2+1 dimensions. Cambridge University Press, 1998.

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NATO Advanced Research Workshop on Quantum Mechanics in Curved Space-Time (1989 Erice, Italy). Quantum mechanics in curved space-time. Plenum Press, 1990.

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B, Barbour Julian, and Pfister Herbert 1936-, eds. Mach's principle: From Newton's bucket to quantum gravity. Birkhauser, 1995.

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Daniele, Oriti, ed. Approaches to quantum gravity: Toward a new understanding of space, time, and matter. Cambridge University Press, 2009.

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Parker, Leonard Emanuel. Quantum field theory in curved spacetime: Quantized fields and gravity. Cambridge University Press, 2009.

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Hsu, J. P. Space-time symmetry and quantum Yang-Mills gravity: How space-time translational gauge symmetry enables the unification of gravity with other forces. World Scientific, 2013.

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International, Workshop on Theoretical Physics (1992 Erice Italy). String quantum gravity and physics at the Planck energy scale: International Workshop on Theoretical Physics, Erice, Italy, 21-28 June 1992. World Scientific, 1993.

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Company, Teaching, ed. Einstein's relativity and the quantum revolution: Modern physics for non-scientists : [Part I]. 2nd ed. Teaching Co., 2000.

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Fauser, Bertfried, Jürgen Tolksdorf, and Eberhard Zeidler, eds. Quantum Gravity. Birkhäuser Basel, 2007. http://dx.doi.org/10.1007/978-3-7643-7978-0.

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Book chapters on the topic "Quantum Gravity and Time"

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Huggett, Nick, Tiziana Vistarini, and Christian Wüthrich. "Time in Quantum Gravity." In A Companion to the Philosophy of Time. John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118522097.ch15.

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Greensite, J. "Probability, Time, and Gravity." In Probabilistic Methods in Quantum Field Theory and Quantum Gravity. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3784-7_16.

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Nicolai, H., D. Korotkin, and H. Samtleben. "Integrable Classical and Quantum Gravity." In Quantum Fields and Quantum Space Time. Springer US, 1997. http://dx.doi.org/10.1007/978-1-4899-1801-7_9.

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Wüthrich, Christian. "No Presentism in Quantum Gravity." In Space, Time, and Spacetime. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13538-5_12.

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Bojowald, Martin. "Loop Quantum Cosmology, Space-Time Structure, and Falsifiability." In Quantum Gravity and Quantum Cosmology. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-33036-0_7.

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Gambini, Rodolfo, Rafael A. Porto, and Jorge Pullin. "Fundamental Loss of Quantum Coherence from Quantum Gravity." In The Arrows of Time. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23259-6_3.

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Shankaranarayanan, S. "What Are the Atoms of the Space Time?" In Gravity and the Quantum. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51700-1_23.

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Bojowald, Martin. "Space-Time Extensions in Quantum Gravity." In Minkowski Spacetime: A Hundred Years Later. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3475-5_8.

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Kiefer, Claus. "Space, Time, Matter in Quantum Gravity." In Fundamental Theories of Physics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51197-5_9.

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Kiefer, Claus. "Does Time Exist in Quantum Gravity?" In Towards a Theory of Spacetime Theories. Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-3210-8_10.

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Conference papers on the topic "Quantum Gravity and Time"

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Caroff, Sami, Anna Campoy-Ordaz, Ugo Pensec, Cyann Plard, and Alessandro Armando Vigliano. "Search for Lorentz Invariance Violation with time-lag on gamma-ray Cherenkov Telescope data : From the data to the time lag constraints." In Winter School of Theoretical Physics, Second and Third Training School of COST Action CA18108 "Quantum gravity phenomenology in the multi-messenger approach". Sissa Medialab, 2024. http://dx.doi.org/10.22323/1.440.0009.

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Yu, Hoi Lai. "Intrinsic Time Quantum Gravity." In Second LeCosPA International Symposium: Everything about Gravity. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813203952_0022.

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ASADOV, V. V., and O. V. KECHKIN. "CLIFFORD GRAVITY — EFFECTIVE QUANTUM GRAVITY FOR FERMIONIC MATTER WITH ARROW OF TIME." In Quantum Mechanics, Elementary Particles, Quantum Cosmology and Complexity. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814335614_0060.

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Soo, Chopin. "Quantum Geometrodynamics with Intrinsic Time Development." In Second LeCosPA International Symposium: Everything about Gravity. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813203952_0009.

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KIEFER, CLAUS. "ARROW OF TIME FROM TIMELESS QUANTUM GRAVITY." In Proceedings of the International Colloquium on the Science of Time. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812774392_0016.

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Stoughton, Chris. "GQuEST: Gravity from the Quantum Entanglement of Space Time." In GQuEST: Gravity from the Quantum Entanglement of Space Time. US DOE, 2024. http://dx.doi.org/10.2172/2282457.

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Piazza, Federico, and Fabio Costa. "Space-time regions as "subsystems"." In From Quantum to Emergent Gravity: Theory and Phenomenology. Sissa Medialab, 2008. http://dx.doi.org/10.22323/1.043.0032.

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't Hooft, Gerard. "Quantum Gravity without Space-time Singularities or Horizons." In Proceedings of the International School of Subnuclear Physics. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814374125_0010.

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Chakraborty, Anwesha. "Emergent geometric phase in time-dependent noncommutative quantum system." In Corfu Summer Institute 2022 "School and Workshops on Elementary Particle Physics and Gravity". Sissa Medialab, 2023. http://dx.doi.org/10.22323/1.436.0342.

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Blasone, Massimo, Francesco Giacosa, Luca Smaldone, and Giorgio Torrieri. "Quantum field theory at finite time and neutrino oscillations." In Corfu Summer Institute 2023 "School and Workshops on Elementary Particle Physics and Gravity". Sissa Medialab, 2024. http://dx.doi.org/10.22323/1.463.0098.

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Reports on the topic "Quantum Gravity and Time"

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Lynch, James F. A digital Higgs universe and the flow of time. Woods Hole Oceanographic Institution, 2024. http://dx.doi.org/10.1575/1912/70830.

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Theoretically considering velocities greater than c implies considering an observer’s past and extends the overall analysis into the complex plane. By using a series of rotations by i in the complex plane at the Planck scale, one can create a four-lobed structure of “instants of time,” which together with considering matter and antimatter in the lobes and the +/- sense of the rotation, leads to a Higgs field representation of spacetime. A metric is developed for this system as well as a generalized spacetime interval. It is shown that the Friedmann Equations are consistent with our “Higgs Cosm
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Maydykovskiy, Igor, and Petra Užpelkis. The Concept of space-time quanta in future technologies. Intellectual Archive, 2020. http://dx.doi.org/10.32370/iaj.2464.

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The article discusses the possibility of using the technological advantages that appear in connection with the discovery of the physical essence of Time and new interpretation of the structure of space in the form of space-time quanta. One of the problems that can be successfully solved on the basis of the new physical model is the problem of establishing the true nature of gravity. The solution to this problem is directly related to the implementation of the idea of unsupported motion based on the interaction in a certain way of the created asymmetric interference structure of longitudinal wa
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Svetlichny, George. Nonlinear Quantum Gravity. Journal of Geometry and Symmetry in Physics, 2012. http://dx.doi.org/10.7546/jgsp-6-2006-118-126.

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Tsamis, N. C., and R. P. Woodard. Quantum gravity slows inflation. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/203905.

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Alexander, S. Quantum Gravity and Inflation. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/826908.

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Lorente, Miguel. Spin Networks in Quantum Gravity. Journal of Geometry and Symmetry in Physics, 2012. http://dx.doi.org/10.7546/jgsp-6-2006-85-100.

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Perelstein, M. Topics in Theories of Quantum Gravity. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/839827.

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Gleiser, M., R. Holman, and N. P. Neto. First order formalism for quantum gravity. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/6507242.

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Jafferis, Daniel. Topics in string theory, quantum field theory and quantum gravity. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1846570.

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Hartman, Thomas. Universality in Quantum Gravity: Final Technical Report. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1779062.

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