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Articoli di riviste sul tema "Fundamental constants"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 2 febbraio 2022

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1

McNaught, Ian J., e Gavin D. Peckham. "Two fundamental constants". Journal of Chemical Education 64, n. 12 (dicembre 1987): 999. http://dx.doi.org/10.1021/ed064p999.

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2

Fritzsch, Harald. "Fundamental physical constants". Uspekhi Fizicheskih Nauk 179, n. 4 (2009): 383. http://dx.doi.org/10.3367/ufnr.0179.200904d.0383.

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3

Jacobsen, T. "On fundamental constants". European Journal of Physics 17, n. 2 (1 marzo 1996): 92. http://dx.doi.org/10.1088/0143-0807/17/2/011.

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4

PERES, ASHER. "VARIABILITY OF FUNDAMENTAL CONSTANTS". International Journal of Modern Physics D 12, n. 09 (ottobre 2003): 1751–54. http://dx.doi.org/10.1142/s0218271803004043.

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Are universal fundamental constants really constant over cosmological times? Recent observations of the fine structure of spectral lines in the early universe have been interpreted as due to a variation of the fine structure constant e2/4πε0ℏc. From the assumed validity of Maxwell equations in general relativity and well known experimental facts, it is proved that e and ℏ are absolute constants. On the other hand, the speed of light need not be constant.

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5

Mohr, Peter J., Barry N. Taylor e David B. Newell. "The fundamental physical constants". Physics Today 60, n. 7 (luglio 2007): 52–55. http://dx.doi.org/10.1063/1.2761803.

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6

Troitskiĭ, V. S. "Evolution of fundamental constants". Soviet Journal of Quantum Electronics 17, n. 9 (30 settembre 1987): 1212–13. http://dx.doi.org/10.1070/qe1987v017n09abeh009915.

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7

Jacobsen, T. "Bremsstrahlung and fundamental constants". European Journal of Physics 17, n. 6 (1 novembre 1996): 365. http://dx.doi.org/10.1088/0143-0807/17/6/012.

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8

Casey, Terence W. "Cosmology and the Fundamental Constants." Physics Essays 2, n. 1 (1 marzo 1989): 44–46. http://dx.doi.org/10.4006/1.3036470.

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9

Okun, Lev B. "The fundamental constants of physics". Uspekhi Fizicheskih Nauk 161, n. 9 (1991): 177–94. http://dx.doi.org/10.3367/ufnr.0161.199109e.0177.

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10

Fritzsch, Harald. "The fundamental constants in physics". Physics-Uspekhi 52, n. 4 (30 aprile 2009): 359–67. http://dx.doi.org/10.3367/ufne.0179.200904d.0383.

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11

Mohr, Peter J., e Barry N. Taylor. "QED and the fundamental constants". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 235, n. 1-4 (luglio 2005): 1–6. http://dx.doi.org/10.1016/j.nimb.2005.03.135.

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12

García, A. López, J. A. López Ortí, R. López Machí e F. Marco Castillo. "Correction of Fundamental Catalogue Constants". International Astronomical Union Colloquium 127 (1991): 271. http://dx.doi.org/10.1017/s025292110006396x.

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AbstractOne of the main problems in positional astronomy is determining the equator and vernal equinox of the reference system.In this paper we display a method of amendment of minor planets elements taking into account the perturbations in the coefficients of the equations of condition, also including the corrections of the vernal equinox and obliquity in the fitting.

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13

Mohr, Peter J. "The fundamental constants and theory". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, n. 1834 (28 luglio 2005): 2123–37. http://dx.doi.org/10.1098/rsta.2005.1641.

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The Committee on Data for Science and Technology has recently recommended a new self-consistent set of values of basic constants and conversion factors of physics and chemistry. These values are based on a least-squares analysis that takes into account all of the latest relevant experimental and theoretical information in a consistent framework. Theory plays a role, because the experimental data are compared to the corresponding theoretical predictions which are functions of the fundamental constants. The best values of the constants are taken to be those that give the best agreement between the data and these predictions, in the least-squares sense. An overview of the calculations that influence the recommended values of the constants will be given.

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14

Okun', Lev B. "The fundamental constants of physics". Soviet Physics Uspekhi 34, n. 9 (30 settembre 1991): 818–26. http://dx.doi.org/10.1070/pu1991v034n09abeh002475.

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15

Taylor, B. N. "Basic standards and fundamental constants". IEEE Transactions on Instrumentation and Measurement 38, n. 2 (aprile 1989): 164–66. http://dx.doi.org/10.1109/19.192265.

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16

Norman, Eric B. "Are fundamental constants really constant?" American Journal of Physics 54, n. 4 (aprile 1986): 317–21. http://dx.doi.org/10.1119/1.14847.

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17

MELNIKOV, V. N. "MULTIDIMENSIONAL COSMOLOGY AND FUNDAMENTAL CONSTANTS". International Journal of Modern Physics A 24, n. 08n09 (10 aprile 2009): 1473–80. http://dx.doi.org/10.1142/s0217751x0904484x.

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Studies of multidimensional models with different sources (models with S -branes, thin and thick brane worlds, Kaluza-Klein type models in curvature-nonlinear multidimensional gravity etc.) and their application to the cosmological constant, cosmological singularity, hierarchy and coincidence problems are presented. Their observational predictions: variations of fundamental physical constants, new types of black holes and wormholes are discussed.

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18

Fritzsch, Harald. "Fundamental Constants at High Energy". Fortschritte der Physik 50, n. 5-7 (maggio 2002): 518–24. http://dx.doi.org/10.1002/1521-3978(200205)50:5/7<518::aid-prop518>3.0.co;2-f.

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19

Volovik, G. E. "Fundamental constants in effective theory". Journal of Experimental and Theoretical Physics Letters 76, n. 2 (luglio 2002): 77–79. http://dx.doi.org/10.1134/1.1510061.

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20

Petley, Brian. "Clocking the fundamental physical constants". Physics World 7, n. 1 (gennaio 1994): 23–24. http://dx.doi.org/10.1088/2058-7058/7/1/29.

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21

Cohen, E. Richard, e Barry N. Taylor. "Fundamental Physical Constants 1986 Adjustments". Europhysics News 18, n. 5 (1987): 65–68. http://dx.doi.org/10.1051/epn/19871805065.

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22

Barrow, J. D., e C. O'Toole. "Spatial variations of fundamental constants". Monthly Notices of the Royal Astronomical Society 322, n. 3 (11 aprile 2001): 585–88. http://dx.doi.org/10.1046/j.1365-8711.2001.04157.x.

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23

de Laeter, John R. "Atomic Weights and Fundamental Constants". Interdisciplinary Science Reviews 19, n. 2 (giugno 1994): 121–28. http://dx.doi.org/10.1179/isr.1994.19.2.121.

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24

Braun, E. "Fundamental Constants and Physical Units". Metrologia 28, n. 1 (1 gennaio 1991): 55–56. http://dx.doi.org/10.1088/0026-1394/28/1/009.

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25

Tarbeev, Yu V., V. M. Mostepanenko e M. I. �ides. "Fundamental physical constants and standards". Measurement Techniques 29, n. 8 (agosto 1986): 691–94. http://dx.doi.org/10.1007/bf00863947.

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26

Uzan, Jean-Philippe. "The stability of fundamental constants". Comptes Rendus Physique 16, n. 5 (giugno 2015): 576–85. http://dx.doi.org/10.1016/j.crhy.2015.03.007.

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27

Kononogov, S. A. "Metrology and fundamental physical constants". Measurement Techniques 49, n. 2 (febbraio 2006): 97–102. http://dx.doi.org/10.1007/s11018-006-0070-3.

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28

Bormashenko, Edward, e Avigdor Sheshnev. "Measurable values, numbers and fundamental physical constants: Is the Boltzmann constant Kb a fundamental physical constant?" Thermal Science 13, n. 4 (2009): 253–58. http://dx.doi.org/10.2298/tsci0904253b.

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Abstract (sommario):

The status of fundamental physical constants is discussed. The nature of fundamental physical constants is cleared up, based on the analysis of the Boltzmann constant. A new definition of measurable values, 'mathematical' and 'physical' numbers and fundamental physical constants is proposed. Mathematical numbers are defined as values insensitive to the choice of both units and frames of reference, whereas 'physical numbers' are dimensionless values, insensitive to transformations of units and sensitive to the transformations of the frames of reference. Fundamental constants are classified as values sensitive to transformations of the units and insensitive to transformations of the frames of reference. It is supposed that a fundamental physical constant necessarily allows diminishing the number of independent etalons in a system of units.

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29

Trachenko, K., B. Monserrat, C. J. Pickard e V. V. Brazhkin. "Speed of sound from fundamental physical constants". Science Advances 6, n. 41 (ottobre 2020): eabc8662. http://dx.doi.org/10.1126/sciadv.abc8662.

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Two dimensionless fundamental physical constants, the fine structure constant α and the proton-to-electron mass ratio mpme, are attributed a particular importance from the point of view of nuclear synthesis, formation of heavy elements, planets, and life-supporting structures. Here, we show that a combination of these two constants results in a new dimensionless constant that provides the upper bound for the speed of sound in condensed phases, vu. We find that vuc=α(me2mp)12, where c is the speed of light in vacuum. We support this result by a large set of experimental data and first-principles computations for atomic hydrogen. Our result expands the current understanding of how fundamental constants can impose new bounds on important physical properties.

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30

LEE, Ho Seong, Inseok YANG e Kwang Cheol LEE. "Redefinition of Units with Fundamental Constants". Physics and High Technology 25, n. 11 (30 novembre 2016): 19–24. http://dx.doi.org/10.3938/phit.25.059.

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31

Fritzsch, H. "Fundamental constants and their time variation". Progress in Particle and Nuclear Physics 66, n. 2 (aprile 2011): 193–96. http://dx.doi.org/10.1016/j.ppnp.2011.01.005.

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32

Tomilin, K. A. "Fundamental constants, quantum metrology and electrodynamics". Physical Interpretation of Relativity Theory: Proceedings of International Meeting., n. 1 (dicembre 2015): 511–22. http://dx.doi.org/10.18698/2309-7604-2015-1-511-522.

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33

Groten, Erwin. "A Comment on Fundamental Geodetic Constants". Highlights of Astronomy 10 (1995): 200. http://dx.doi.org/10.1017/s1539299600010960.

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34

Conroy, R. S. "Frequency standards, metrology and fundamental constants". Contemporary Physics 44, n. 2 (marzo 2003): 99–135. http://dx.doi.org/10.1080/00107910210164020.

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35

Mayerhöfer, Thomas G., e Jürgen Popp. "Effective optical constants: A fundamental discrepancy". Vibrational Spectroscopy 42, n. 1 (ottobre 2006): 118–23. http://dx.doi.org/10.1016/j.vibspec.2006.01.002.

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36

Karshenboim, S. G., e E. Peik. "Astrophysics, atomic clocks and fundamental constants". European Physical Journal Special Topics 163, n. 1 (ottobre 2008): 1–7. http://dx.doi.org/10.1140/epjst/e2008-00805-9.

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37

Mendes, R. V. "Deformations, stable theories and fundamental constants". Journal of Physics A: Mathematical and General 27, n. 24 (21 dicembre 1994): 8091–104. http://dx.doi.org/10.1088/0305-4470/27/24/019.

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38

Clara, M. T., e C. J. A. P. Martins. "Primordial nucleosynthesis with varying fundamental constants". Astronomy & Astrophysics 633 (gennaio 2020): L11. http://dx.doi.org/10.1051/0004-6361/201937211.

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Abstract (sommario):

Primordial nucleosynthesis is an observational cornerstone of the Hot Big Bang model and a sensitive probe of physics beyond the standard model. Its success has been limited by the so-called lithium problem, for which many solutions have been proposed. We report on a self-consistent perturbative analysis of the effects of variations in nature’s fundamental constants, which are unavoidable in most extensions of the standard model, on primordial nucleosynthesis, focusing on a broad class of Grand Unified Theory models. A statistical comparison between theoretical predictions and observational measurements of 4He, D, 3He and, 7Li consistently yields a preferred value of the fine-structure constant α at the nucleosynthesis epoch that is larger than the current laboratory one. The level of statistical significance and the preferred extent of variation depend on model assumptions but the former can be more than four standard deviations, while the latter is always compatible with constraints at lower redshifts. If lithium is not included in the analysis, the preference for a variation of α is not statistically significant. The abundance of 3He is relatively insensitive to such variations. Our analysis highlights a viable and physically motivated solution to the lithium problem, which warrants further study.

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39

Antypas, Dionysios, Dmitry Budker, Victor V. Flambaum, Mikhail G. Kozlov, Gilad Perez e Jun Ye. "Fast Apparent Oscillations of Fundamental Constants". Annalen der Physik 532, n. 4 (aprile 2020): 1900566. http://dx.doi.org/10.1002/andp.201900566.

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40

Karshenboim, Savely G., Peter J. Mohr e David B. Newell. "Advances in Determination of Fundamental Constants". Journal of Physical and Chemical Reference Data 44, n. 3 (settembre 2015): 031101. http://dx.doi.org/10.1063/1.4926575.

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41

Gilliard, Richard P. "Fundamental units and constants of physics". Advanced Studies in Theoretical Physics 14, n. 4 (2020): 209–17. http://dx.doi.org/10.12988/astp.2020.91466.

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42

Klose, Volkmar, e Bernhard Kramer. "Fundamental Constants in Physics and Metrology". Metrologia 22, n. 3 (1 gennaio 1986): 117. http://dx.doi.org/10.1088/0026-1394/22/3/e01.

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43

Fukui, Takao. "Fundamental constants and higher-dimensional universe". General Relativity and Gravitation 20, n. 10 (ottobre 1988): 1037–45. http://dx.doi.org/10.1007/bf00759024.

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44

Tuninskii, V. S. "Adjusting correlated values of fundamental constants". Measurement Techniques 29, n. 8 (agosto 1986): 702–6. http://dx.doi.org/10.1007/bf00863950.

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45

Faustov, R. N. "Quantum electrodynamics and the fundamental constants". Measurement Techniques 33, n. 1 (gennaio 1990): 7–14. http://dx.doi.org/10.1007/bf00866807.

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46

Studentsov, N. V. "Unit systems and the fundamental constants". Measurement Techniques 40, n. 3 (marzo 1997): 197–202. http://dx.doi.org/10.1007/bf02504075.

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47

Varshalovich, D. A., e A. Y. Potekhin. "Cosmological variability of fundamental physical constants". Space Science Reviews 74, n. 3-4 (novembre 1995): 259–68. http://dx.doi.org/10.1007/bf00751411.

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48

Bonifacio, P., H. Rahmani, J. B. Whitmore, M. Wendt, M. Centurion, P. Molaro, R. Srianand et al. "Fundamental constants and high-resolution spectroscopy". Astronomische Nachrichten 335, n. 1 (gennaio 2014): 83–91. http://dx.doi.org/10.1002/asna.201312005.

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49

Deal, M., e C. J. A. P. Martins. "Primordial nucleosynthesis with varying fundamental constants". Astronomy & Astrophysics 653 (settembre 2021): A48. http://dx.doi.org/10.1051/0004-6361/202140725.

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Abstract (sommario):

The success of primordial nucleosynthesis has been limited by the long-standing lithium problem. We use a self-consistent perturbative analysis of the effects of the relevant theoretical parameters on primordial nucleosynthesis, including variations of nature’s fundamental constants, to explore the problem and its possible solutions in the context of the latest observations and theoretical modeling. We quantify the amount of depletion needed to solve the lithium problem, and show that transport processes of chemical elements in stars are able to account for it. Specifically, the combination of atomic diffusion, rotation, and penetrative convection allows us to reproduce the lithium surface abundances of Population II stars, starting from the primordial lithium abundance. We also show that even with this depletion factor, a preference for a value of the fine-structure constant at this epoch remains that is larger than the value currently obtained in the laboratory by a few parts per million of relative variation at a statistical significance level of two to three standard deviations. This preference is driven by the recently reported discrepancy between the best-fit values for the baryon-to-photon ratio (or equivalently, the Deuterium abundance) inferred from cosmic microwave background and primordial nucleosynthesis analyses, and is largely insensitive to the Helium-4 abundance. We thus conclude that the lithium problem most likely has an astrophysical solution, while the Deuterium discrepancy provides a possible indication of new physics.

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50

McConnon, Aili. "Latest values of fundamental physics constants". Scilight 2021, n. 39 (24 settembre 2021): 391101. http://dx.doi.org/10.1063/10.0005894.

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