Results 1 to 10 of about 20,829 (241)

Neutrinos and Big-Bang Nucleosynthesis [PDF]

Nuclear Physics A, 1998
Observations of clusters and super clusters of galaxies have indicated that the Universe is more dominated by baryons than ever estimated in the homogeneous cosmological model for primordial nucleosynthesis.
Alcock, Applegate, Bahcall, Copi, Kajino, M. Orito, Mathews, Orito, Rugers, T. Kajino, Tytler, Wagoner, Weinberg, White   +13 more
core   +9 more sources

Neutrino statistics and big bang nucleosynthesis [PDF]

Journal of Cosmology and Astroparticle Physics, 2005
Neutrinos may possibly violate the spin-statistics theorem, and hence obey Bose statistics or mixed statistics despite having spin half. We find the generalized equilibrium distribution function of neutrinos which depends on a single fermi-bose parameter,
A D Dolgov, A Yu Smirnov, Barabash A S Dolgov A D Domin P Smirnov A Yu \~Simkovic F, Cuoco A Lesgourgues J Mangano G Pastor S, Dolgov A D Smirnov A Yu, Fields B D Olive K A, Hannestad S, Hannestad S Mirizzi A Raffelt G, Ignatiev A Yu, Ignatiev A Yu, Kawano L, Okun L B, Okun L B, Okun L B, Okun L B, Pastor S, S H Hansen, Serpico P D, Steigman G, Steigman G Pasquini L Randich S   +19 more
core   +6 more sources

Neutrino oscillations and Big Bang Nucleosynthesis [PDF]

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
We outline how relic neutrino asymmetries may be generated in the early universe via active-sterile neutrino oscillations. We discuss possible consequences for big bang nucleosynthesis, within the context of a particular 4-neutrino model.Comment: 6 pages.
Bell, Bell, Di Bari, Di Bari, Dolgov, Foot, Foot, Hannestad, Lee, Nicole F. Bell, Notzold, Volkas   +11 more
core   +6 more sources

Chaotic Amplification of Neutrino Chemical Potentials by Neutrino Oscillations in Big Bang Nucleosynthesis [PDF]

, 1996
We investigate in detail the parameter space of active-sterile neutrino oscillations that amplifies neutrino chemical potentials at the epoch of Big Bang Nucleosynthesis.
A. Balysh, A. Klypin, B. Achkar, B. D. Fields, C. Athanassopoulos, C. Cardall, C. Copi, D. Nötzold, E. W. Kolb, G. Sigl, J. Hills, J. M. Cline, J. R. Primack, K. Enqvist, K. Enqvist, L. Montanet, N. Hata, P. Bergé, P. G. Langacker, R. Barbieri, R. Foot, R. Foot, T. P. Walker, X. Shi, X. Shi, Xiangdong Shi, Y-Z. Qian, Y. David   +27 more
core   +4 more sources

Neutrinos and Big Bang Nucleosynthesis [PDF]

Advances in High Energy Physics, 2012
According to the standard models of particle physics and cosmology, there should be a background of cosmic neutrinos in the present Universe, similar to the cosmic microwave photon background.
Gary Steigman
doaj   +5 more sources

Constraining f(T) teleparallel gravity by big bang nucleosynthesis [PDF]

European Physical Journal C: Particles and Fields, 2017
We use Big Bang Nucleosynthesis (BBN) observational data on the primordial abundance of light elements to constrain f(T) gravity. The three most studied viable f(T) models, namely the power law, the exponential and the square-root exponential are ...
S. Capozziello, G. Lambiase, E. N. Saridakis   +2 more
doaj   +2 more sources

Lorentz invariance violation in the neutrino sector: a joint analysis from big bang nucleosynthesis and the cosmic microwave background

European Physical Journal C: Particles and Fields, 2017
We investigate constraints on Lorentz invariance violation in the neutrino sector from a joint analysis of big bang nucleosynthesis and the cosmic microwave background.
Wei-Ming Dai, Zong-Kuan Guo, Rong-Gen Cai, Yuan-Zhong Zhang   +3 more
doaj   +3 more sources

Big bang nucleosynthesis with a varying fine structure constant and non-standard expansion rate [PDF]

, 2004
We calculate primordial abundances of light elements produced during big bang nucleosynthesis when the fine structure constant and/or the cosmic expansion rate take non-standard values.
A. Coc, B.D. Fields, C. Angulo, C.J.A. Martins, D. Kirkman, D.N. Spergel, J. Gasser, J.P. Uzan, K. Ichikawa, K.M. Nollett, Kazuhide Ichikawa, L. Bergstrom, M. Dine, M. Kawasaki, M. Kawasaki, Masahiro Kawasaki, P. Bonifacio, R.H. Cyburt, R.H. Cyburt, S. Mukohyama, S.G. Ryan, T. Shiromizu, V. Barger, V. Barger, V.F. Dmitriev, W. Hu, Y.I. Izotov   +26 more
core   +2 more sources

Challenges to the standard model of Big Bang nucleosynthesis. [PDF]

Proc Natl Acad Sci U S A, 1993
Steigman G.
europepmc   +2 more sources

Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model [PDF]

, 2005
This article presents an original code for Big Bang Nucleosynthesis in a baryon inhomogeneous model of the universe. In this code neutron diffusion between high and low baryon density regions is calculated simultaneously with the nuclear reactions and ...
G. Steigman, J. Barrow, J. Lara, J. Lara, J. F. Lara, Juan F. Lara, S. de Groot, T. Kajino, Y. Zeldovich   +8 more
core   +2 more sources