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Showing 1 to 13 of 13 for “"Fundamental Constants"”.
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Quantum electrodynamics and fundamental constants
… bound states make them an ideal study object for fundamental physics and the determination of fundamental constants. This requires a careful study of the effects from quantum electrodynamics (QED) on the interaction between the electron and the nucleus.</p> <p>The two theoretical approaches for …
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Precise atomic masses for determining fundamental constants
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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The need for a community-wide determination of the fundamental constants
Tests of fundamental theory are sensitive to the values of the fundamental (physical) constants. These values are determined by a global fit to experimental data and depend on the data, theory, and theory uncertainties that enter the fit. Tests of fundamental theory are thus sensitive, to a greater …
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Manifestations of Dark Matter and Variations of the Fundamental Constants of Nature in Atoms and Astrophysical Phenomena
… the induction of a cosmological evolution of the fundamental constants (such as the electromagnetic fine-structure constant \alpha and the particle masses), which may be sought for with atomic clock spectroscopy and laser interferometry measurements in the laboratory, as well as astrophysical big …
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Quantised charge pumping in a perpendicular magnetic field
… aims to redefine these quantities in terms of fundamental constants of nature such as the Planck, A vogadro and Boltzmann constants. In the electrical domain, the quantum Hall effect and Josephson effect provide quantum standards for resistance and voltage, respectively. Combining them through …
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Trapping, laser cooling, and spectroscopy of Thorium IV
… frequency metrology and tests of variation of fundamental constants. This work is a report on the development of required technologies to realize such a nuclear optical clock with a single, trapped, laser cooled ²²⁹Th³⁺ ion. Creation, trapping, laser cooling, and precision spectroscopy are …
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Fundamental physics from observations of the early universe
… will enable cosmology to answer some of the fundamental questions in physics. The linear perturbation theory may not be accurate enough to interpret the observations from Planck and future CMB experiments. Second order effects may in particular be important in constraining the non-Gaussianity …
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Predictive modeling of combustion processes
… other situations. To improve this process a more fundamental understanding of chemistry and physical processes is required. The fundamental constants like rate coefficients of elementary reactions are readily transferable enabling us to use results from one set of experiments or calculations in a …
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An ultracold gas of dipolar fermionic ²³Na⁴⁰K molecules
… quantum matter, precision measurements of fundamental constants, and quantum information processing. The work starts with the creation of a new Bose-Fermi mixture of ²³Na and ⁴⁰K, and a systematic study of Feshbach resonances between the two atomic species. The study reveals more than 20 …
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A Trapped Single Ion Inside a Bose-Einstein Condensate
… computing algorithms and to detect variations of fundamental constants in precision atomic clocks. Now in our experiment we investigate how the two systems can be advantageously combined. We immerse a single trapped Yb+ ion in a Bose-Einstein condensate of Rb atoms. Our hybrid setup consists of a …
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Implementation of the Quantum Hall Effect based precision resistance measurement system
… (QHR) which had found to be related to two fundamental constants of nature via the von Klitzing constant h e 2 , where e is the charge of the electron and h Planck’s constant. This thesis investigates the properties of the QHE in a low dimensional electron gas system. The von Klitzing …
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High contrast interferometry and finite temperature coherence of Bose-Einstein condensates
… and can be used for precision measurements of fundamental physics, fundamental constants, rotations and gravitational gradients. The coherence properties of atomic matter-waves are of great interest, in particular phase coherence, which has played an important role in fundamental research …
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Photon-Number Resolving by Superconductive Devices
… the proposal wants to link the SI units to fundamental constants, leaving f.i. material artifact. Considering the recent advances in optical radiometry and in quantum technologies, for the candela world it means redefine its unit linking to the Planck constant and consequently expressing the …