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      CODATA Recommended Values of the Fundamental Physical Constants: 2014

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          Abstract

          This report gives the 2014 self-consistent set of values of the constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA). These values are based on a least-squares adjustment that takes into account all data available up to 31 December 2014. The recommended values may also be found on the World Wide Web at physics.nist.gov/constants.

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          Review of Particle Physics

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            Big-Bang Nucleosynthesis

            A critical review is given of the current status of cosmological nucleosynthesis. In the framework of the Standard Model with 3 types of relativistic neutrinos, the baryon-to-photon ratio, \(\eta\), corresponding to the inferred primordial abundances of deuterium and helium-4 is consistent with the independent determination of \(\eta\) from observations of anisotropies in the cosmic microwave background. However the primordial abundance of lithium-7 inferred from observations is significantly below its expected value. Taking systematic uncertainties in the abundance estimates into account, there is overall concordance in the range \(\eta = (5.7-6.7)\times 10^{-10}\) at 95% CL (corresponding to a cosmological baryon density \(\Omega_B h^2 = 0.021 - 0.025\)). The D and He-4 abundances, when combined with the CMB determination of \(\eta\), provide the bound \(N_\nu=3.28 \pm 0.28\) on the effective number of neutrino species. Other constraints on new physics are discussed briefly.
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              CODATA recommended values of the fundamental physical constants: 2006

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                Author and article information

                Journal
                2015-07-21
                Article
                10.1103/RevModPhys.88.035009
                1507.07956

                http://creativecommons.org/publicdomain/zero/1.0/

                Custom metadata
                11 pages, 8 tables
                physics.atom-ph physics.chem-ph physics.data-an

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