Physics – Nuclear Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dnp5wb002s&link_type=abstract
American Physical Society, Division of Nuclear Physics Fall Meeting, October 30 - November 1, 2003, Tucson, Arizona, MEETING ID:
Physics
Nuclear Physics
Scientific paper
One of the key pillars of modern cosmology, Big Bang Nucleosynthesis (BBN) offers a probe of the particle content and expansion rate of the Universe a mere few minutes after the beginning. When compared with the BBN predictions, the primordial abundances of deuterium and helium-4 provide an excellent baryometer and chronometer respectively. Helium-4 is also sensitive to the neutrino content of the Universe and is a potential probe of any asymmetry between neutrinos and antineutrinos. Several hundred thousand years after BBN, when the Cosmic Background Radiation (CBR) photons began progagating freely, the spectrum of temperature fluctuations imprinted on them were also sensitive to the baryon density and to the expansion rate. The comparison between the constraints imposed by BBN and those from the CBR reveals a consistent picture of the Universe at two very widely separated epochs. Combining these two probes leads to new, tighter constraints on the baryon density at present and on possible new physics beyond the standard model of particle physics.
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