Europhys. Lett.
Volume 74, Number 5, June 2006
Page(s) 813 - 816
Section Nuclear physics
Published online 26 April 2006
Europhys. Lett., 74 (5), pp. 813-816 (2006)
DOI: 10.1209/epl/i2006-10031-y

Possible evidence for "dark radiation" from Big Bang Nucleosynthesis data

V. V. Flambaum1, 2 and E. V. Shuryak3

1  School of Physics, The University of New South Wales - Sydney NSW 2052, Australia
2  Physics Division, Argonne National Laboratory - Argonne, IL 60439-4843, USA
3  Department of Physics and Astronomy, State University of New York Stony Brook, NY 11794-3800, USA

received 22 March 2006; accepted in final form 3 April 2006
published online 26 April 2006

We address the emerging discrepancy between the Big Bang Nucleosynthesis data and standard cosmology, which asks for a bit longer evolution time. If this effect is real, one possible implication (in a framework of brane cosmology model) is that there is a "dark radiation" component which is negative and makes few percents of ordinary matter density. If so, all scales of this model can be fixed, provided brane-to-bulk leakage problem is solved.

26.35.+c - Big Bang nucleosynthesis.
98.80.Cq - Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.).
98.70.Vc - Background radiations.

© EDP Sciences 2006