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.

doi:10.3847/1538-4357/834/2/165

Title: Non-extensive statistics to the cosmological lithium problem

Journal Article · Wed Jan 11 00:00:00 EST 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/834/2/165· OSTI ID:1537169

Hou, S. Q. ^[1]; He, J. J. ^[2]; Parikh, A. ^[3]; Kahl, D. ^[4]; Bertulani, C. A. ^[5]; Kajino, T. ^[6];

^[7]; Zhao, G. ^[8]

Chinese Academy of Sciences (CAS), Lanzhou (China)
Chinese Academy of Sciences (CAS), Lanzhou (China); Chinese Academy of Sciences (CAS), Beijing (China)
Univ. Politecnica de Catalunya (Spain); Inst. d'Estudis Espacials de Catalunya, Barcelona (Spain)
Univ. of Tokyo (Japan)
Texas A & M Univ., Commerce, TX (United States)
Univ. of Tokyo (Japan); National Astronomical Observatory of Japan, Tokyo (Japan); Beihang Univ., Bejing (China)
National Astronomical Observatory of Japan, Tokyo (Japan); Univ. of Notre Dame, IN (United States)
Chinese Academy of Sciences (CAS), Beijing (China)

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.

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Research Organization:: Texas A & M Univ., Commerce, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-08ER41533; SC0009971

OSTI ID:: 1537169

Journal Information:: The Astrophysical Journal (Online), Vol. 834, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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