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NON-EXTENSIVE STATISTICS TO THE COSMOLOGICAL LITHIUM PROBLEM

Hou, S. Q. ; He, J. J. ; Parikh, A. ; Kahl, D. ; Bertulani, C. A. ; Kajino, T. ; Mathews, G. J. ; Zhao, G.

The Astrophysical journal, 2017-01, Vol.834 (2), p.165 [Periódico revisado por pares]

Philadelphia: The American Astronomical Society

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Título:
NON-EXTENSIVE STATISTICS TO THE COSMOLOGICAL LITHIUM PROBLEM
Autor: Hou, S. Q. ; He, J. J. ; Parikh, A. ; Kahl, D. ; Bertulani, C. A. ; Kajino, T. ; Mathews, G. J. ; Zhao, G.
Assuntos: Abundance ; Astrofísica ; Astronomia i astrofísica ; Astronomy & Astrophysics ; ASTRONOMY AND ASTROPHYSICS ; Astrophysics ; Big bang cosmology ; Boltzmann distribution ; Cosmologia ; Cosmologia i cosmogonia ; Cosmology ; early universe ; Física ; Light elements ; Lithium ; Lithium isotopes ; Nuclear fusion ; Nuclear physics ; Nuclei (nuclear physics) ; Nucleons ; Physics ; plasmas ; primordial nucleosynthesis ; Velocity distribution ; Àrees temàtiques de la UPC
É parte de: The Astrophysical journal, 2017-01, Vol.834 (2), p.165
Notas: Galaxies and Cosmology
AAS03189
FG02-08ER41533; SC0009971
USDOE Office of Science (SC)
Descrição: ABSTRACT Big Bang nucleosynthesis (BBN) theory predicts the abundances of the light elements D, 3He, 4He, and 7Li produced in the early universe. The primordial abundances of D and 4He inferred from observational data are in good agreement with predictions, however, BBN theory overestimates the primordial 7Li abundance by about a factor of three. This is the so-called "cosmological lithium problem." Solutions to this problem using conventional astrophysics and nuclear physics have not been successful over the past few decades, probably indicating the presence of new physics during the era of BBN. We have investigated the impact on BBN predictions of adopting a generalized distribution to describe the velocities of nucleons in the framework of Tsallis non-extensive statistics. This generalized velocity distribution is characterized by a parameter q, and reduces to the usually assumed Maxwell-Boltzmann distribution for q = 1. We find excellent agreement between predicted and observed primordial abundances of D, 4He, and 7Li for 1.069 ≤ q ≤ 1.082, suggesting a possible new solution to the cosmological lithium problem.
Editor: Philadelphia: The American Astronomical Society
Idioma: Inglês

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NON-EXTENSIVE STATISTICS TO THE COSMOLOGICAL LITHIUM PROBLEM

Hou, S. Q. ; He, J. J. ; Parikh, A. ; Kahl, D. ; Bertulani, C. A. ; Kajino, T. ; Mathews, G. J. ; Zhao, G.

Philadelphia: The American Astronomical Society

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