1,721,000 research outputs found
The holographic quantum
Full text link[EN] We present a map of standard quantum mechanics onto a dual theory, that of the classical thermodynamics of irreversible processes. While no gravity is present in our construction, our map exhibits features that are reminiscent of the holographic principle of quantum gravity.Fernández De Córdoba, P.; Isidro San Juan, JM.; Vazquez Molina, J. (2016). The holographic quantum. Foundations of Physics. 46(7):787-803. doi:10.1007/s10701-015-9986-2S787803467Acosta, D., Fernández de Córdoba, P., Isidro, J.M., Santander, J.: An entropic picture of emergent quantum mechanics. Int. J. Geom. Methods Mod. Phys. 9, 1250048 (2012). arXiv:1107.1898 [hep-th]Acosta, D., Fernández de Córdoba, P., Isidro, J.M., Santander, J.L.G.: Emergent quantum mechanics as a classical, irreversible thermodynamics. Int. J. Geom. Methods Mod. Phys. 10, 1350007 (2013). arXiv:1206.4941 [math-ph]Bousso, R.: The holographic principle. Rev. Mod. Phys. 74, 825 (2002). arXiv:hep-th/0203101Blasone, M., Jizba, P., Vitiello, G.: Quantization and dissipation. Phys. Lett. A 287, 205 (2001). arXiv:hep-th/0007138L. de Broglie: La thermodynamique cachée des particules. Ann. Inst. Poincaré (A) Phys. Théorique 1, 1 (1964)Callen, H.: Thermodynamics. Wiley, New York (1960)Carroll, R.: On the Emergence Theme of Physics. World Scientific, Singapore (2010)G. Cohen-Tannoudji: An Interpretive Conjecture for Physics Beyond the Standard Models: Generalized Complementarity. arXiv:1402.0823 [gr-qc]Doob, J.: Stochastic Processes. Wiley, New York (1953)Elze, H.-T.: Symmetry aspects in emergent quantum mechanics. J. Phys. Conf. Ser. 171, 012034 (2009)Fernández de Córdoba, P., Isidro, J.M., Perea, M.H.: Emergent quantum mechanics as a thermal ensemble. Int. J. Geom. Methods Mod. Phys. 11, 1450068 (2014). arXiv:1304.6295 [math-ph]Fernández de Córdoba, P., Isidro, J.M., Perea, M.H., Vazquez Molina, J.: The irreversible quantum. Int. J. Geom. Methods Mod. Phys. 12, 1550013 (2015). arXiv:1311.2787 [quant-ph]Fernández de Córdoba, P., Isidro, J.M., Vazquez Molina, J.: Schroedinger vs. Navier–Stokes. arXiv:1409.7036 [math-ph]Feynman, R.: Space-time approach to non-relativistic quantum mechanics. Rev. Mod. Phys. 20, 367 (1948)Hartnoll, S.: Lectures on holographic methods for condensed matter physics. Class. Quantum Gravity 26, 224002 (2009). arXiv:0903.3246 [hep-th]G. ’t Hooft: Quantum gravity as a dissipative deterministic system. Class. Quantum Gravity 16, 3263 (1999). arXiv:gr-qc/9903084G. ’t Hooft: Emergent quantum mechanics and emergent symmetries. AIP Conf. Proc. 957, 154 (2007). arXiv:0707.4568 [hep-th]Kim, Y., Shin, I., Tsukioka, T.: Holographic QCD: past, present, and future. Prog. Part. Nucl. Phys. 68, 55 (2013). arXiv:1205.4852 [hep-ph]Kolekar, S., Padmanabhan, T.: Indistinguishability of thermal and quantum fluctuations. Class. Quantum Gravity 32, 202001 (2015). arXiv:1308.6289 [gr-qc]Landauer, R.: Irreversibility and heat generation in the computing process. IBM J. Res. Dev. 5, 183 (1961)Maldacena, J.: The large N limit of superconformal field theories and supergravity. Adv. Theor. Math. Phys. 2, 231 (1998). arXiv:hep-th/9711200Matone, M.: Thermodynamique cachée des particules and the quantum potential. Ann. Fond. Broglie 37, 177 (2012). arXiv:1111.0270 [hep-ph]Onsager, L., Machlup, S.: Fluctuations and irreversible processes. Phys. Rev. 91, 1505 (1953)Padmanabhan, T.: Thermodynamical aspects of gravity: new insights. Rep. Prog. Phys. 73, 046901 (2010). arXiv:0911.5004 [gr-qc]Padmanabhan, T.: General relativity from a thermodynamic perspective. Gen. Relativ. Gravit. 46, 1673 (2014). arXiv:1312.3253 [gr-qc]Penrose, R.: The Road to Reality. Jonathan Cape, London (2004)Prigogine, I.: Introduction to Thermodynamics of Irreversible Processes. Interscience, New York (1961)Smolin, L.: On the nature of quantum fluctuations and their relation to gravitation and the principle of inertia. Class. Quantum Gravity 3, 347 (1986)Smolin, L.: Quantum gravity and the statistical interpretation of quantum mechanics. Int. J. Theor. Phys. 25, 215 (1986)Stephens, C., ’ t Hooft, G., Whiting, B.: Black hole evaporation without information loss. Class. Quantum Gravity 11, 621 (1994). arXiv:gr-qc/9310006Susskind, L.: The world as a hologram. J. Math. Phys. 36, 6377 (1995). arXiv:hep-th/9409089Verlinde, E.: On the origin of gravity and the laws of Newton. JHEP 1104, 029 (2011). arXiv:1001.0785 [hep-th]Witten, E.: Anti-de Sitter space and holography. Adv. Theor. Math. Phys. 2, 253 (1998). arXiv:hep-th/980215
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Spacetime metric from quantum-gravity corrected Feynman propagators
Full text link[EN] Differentiation of the scalar Feynman propagator with respect to the spacetime coordinates yields the metric on the background spacetime that the scalar particle propagates in. Now Feynman propagators can be modified in order to include quantum-gravity corrections as induced by a zero-point length L > 0. These corrections cause the length element root s(2) to be replaced with root s(2) + 4L(2) within the Feynman propagator. In this paper, we compute the metrics derived from both the quantum-gravity free propagators and from their quantum-gravity corrected counterparts. We verify that the latter propagators yield the same spacetime metrics as the former, provided one measures distances greater than the quantum of length L. We perform this analysis in the case of the background spacetime Double-struck capital R-D in the Euclidean sector.This work was funded by FEDER/MCIN under grant PID2021-128676OB-I00 (Spain).Fernández de Córdoba, Pedro;Isidro, J.M.;Roy, R. (2024). Spacetime metric from quantum-gravity corrected Feynman propagators. International Journal of Geometric Methods in Modern Physics. 21(07):1-10. https://doi.org/10.1142/S0219887824501391S110210
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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