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Showing 1 to 15 of 15 for “"Big Bang Nucleosynthesis"”.
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Precision frontiers of big bang nucleosynthesis
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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The Influence of Matter-Antimatter Domains on Big Bang Nucleosynthesis
… Primordialen Nukleosynthese — oder auch Big Bang Nukleosynthese (BBN) — werden die relativen Haeufigkeiten der einzelnen Kerne abhangig von den genauen physikalischen Bedingungen im jungen Universum vorhergesagt. Die im Rahmen des Standardmodells der Kosmologie vorhergesagten …
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Dynamics of primordial phase transitions, primordial magnetic fields, and Big Bang nucleosynthesis
… transitions, primordial magnetic fields, and Big Bang Nucleosynthesis. In particular, (1) I have derived the effects of magnetic fields on nucleon and particle reaction rates of astrophysical significance. The sensitivity to the presence of arbitrary degeneracy and polarization has also been …
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Indirect 2H(d,p)3H and 2H(d,n)3He fusion reactions measurement at energies relevant for Big Bang Nucleosynthesis
… burning channels 2H(d,p)3H and 2H(d,n)3He in the Big Bang Nucleosynthesis (BBN) astrophysical scenario. In the beginning is presented this phase of the early universe and why the BBN model is still fine tuned with new results coming from observations and laboratory measurements. This model (if BBN …
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Applications of particle physics to the early universe
… theory of Baryogenesis, of Dark Matter, and of Big Bang Nucleosynthesis. The analysis of the data of the experiment WMAP on the CMB for the search of a non-Gaussian signal is also presented and it results in an upper limit on the amount on non-Gaussianities which is at present the most precise …
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Some numerical investigations in cosmology
… casting doubts on the classical treatment at Big Bang Nucleosynthesis. We propose the DBI chameleon, a consistent high energy modification of the chameleon theory that dynamically renders it weakly coupled to matter during the early universe thereby avoiding the breakdown of calculability. We …
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Inflationary Models: Observables and Viability
… part concerns the transition from in ation to big bang nucleosynthesis, known as reheating. This phase is important as it can a ect the details of the in ationary power spectrum and the present dark matter abundance. In simple models, the universe is dominated by a nearly-homogeneous in aton …
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Primordial Nucleosynthesis in the New Age of Cosmology: Determining Uncertainties, Examining Concordance, and Probing New Physics
Big bang nucleosynthesis (BBN) has long played a key role in the standard cosmology. BBN accurately predicts the primordial light element abundances of deuterium, helium and lithium. The general concordance between the predicted and observed light element abundances provides a direct probe of the …
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Primordial Nucleosynthesis In The New Age Of Cosmology: Determining Uncertainties, Examining Concordance, And Probing New Physics
Big bang nucleosynthesis (BBN) has long played a key role in the standard cosmology. BBN accurately predicts the primordial light element abundances of deuterium, helium and lithium. The general concordance between the predicted and observed light element abundances provides a direct probe of the …
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Forecasting and Optimization in Modern Cosmology
… in tracking dark energy models. We show that Big Bang Nucleosynthesis and Cosmic Microwave Background constraints in these models are extremely di cult to match with existing data. As a result it is unlikely that a detectable deviations from the cosmological constant for these models is …
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Constraining gravitational and cosmological parameters with astrophysical data
… from the late-time cosmic acceleration, big bang nucleosynthesis and inflation. Cosmology can successfully describe the evolution of our universe using six or more adjustable cosmological parameters. There is growing interest in using 3-dimensional neutral hydrogen mapping with the …
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Phenomenological aspects of the E6SSM
… the expansion rate of the universe prior to Big Bang Nucleosynthesis. The new dark matter scenario is consistent with current observations and the modified expansion rate provides a better explanation of various data than the SM prediction. The prospects for a warm dark matter scenario in the …
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Manifestations of Dark Matter and Variations of the Fundamental Constants of Nature in Atoms and Astrophysical Phenomena
… in the laboratory, as well as astrophysical big bang nucleosynthesis measurements. Other linear effects of dark matter include spin-precession effects and oscillating spin-gravity couplings, and parity and time-reversal-invariance violating effects: oscillating nuclear Schiff and magnetic …
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EXPANSION AFTER INFLATION AND REHEATING WITH A CHARGED INFLATON
… for the production of light elements via big-bang nucleosynthesis. It is desirable for such a model also to include a mechanism for the generation of the observed matter-antimatter asymmetry and perhaps a primordial mechanism for the generation of cosmic magnetic fields. The transition …
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A Search for WIMP Dark Matter using an Optimized Chi-square Technique on the Final Data from the Cryogenic Dark Matter Search Experiment (CDMS II).
… Measurements of the cosmic microwave background, big bang nucleosynthesis and many other experiments indicate that <em>∼ </em>80% of the matter in the universe is dark, non-relativistic and cold. The dark matter resides in the halos surrounding galaxies, galaxy clusters and other large-scale …