Back Primordiales Lithiumproblem German Problème du lithium cosmologique French 리튬 문제 Korean Kosmološki problem litijuma Serbian Kozmolojik lityum sorunu Turkish Проблема первинного літію Ukrainian 宇宙锂问题 Chinese

Cosmological lithium problem

In astronomy, the lithium problem or lithium discrepancy refers to the discrepancy between the primordial abundance of lithium as inferred from observations of metal-poor (Population II) halo stars in our galaxy and the amount that should theoretically exist due to Big Bang nucleosynthesis+WMAP cosmic baryon density predictions of the cosmic microwave background (CMB). Namely, the most widely accepted models of the Big Bang suggest that three times as much primordial lithium, in particular lithium-7, should exist.[1] This contrasts with the observed abundance of isotopes of hydrogen (1H and 2H) and helium (3He and 4He) that are consistent with predictions.[2] The discrepancy is highlighted in a so-called "Schramm plot", named in honor of astrophysicist David Schramm, which depicts these primordial abundances as a function of cosmic baryon content from standard BBN predictions.

This "Schramm plot"[3] depicts primordial abundances of 4He, D, 3He, and 7Li as a function of cosmic baryon content from standard BBN predictions. CMB predictions of 7Li (narrow vertical bands, at 95% CL) and the BBN D + 4He concordance range (wider vertical bands, at 95% CL) should overlap with the observed light element abundances (yellow boxes) to be in agreement. This occurs in 4He and is well constrained in D, but is not the case for 7Li, where the observed Li observations lie a factor of 3−4 below the BBN+WMAP prediction.
  1. ^ Fields, Brian D. (2011). "The Primordial Lithium Problem". Annual Review of Nuclear and Particle Science. 61: 47–68. arXiv:1203.3551. doi:10.1146/annurev-nucl-102010-130445.
  2. ^ Hou, S. Q.; He, J.J.; Parikh, A.; Kahl, D.; Bertulani, C.A.; Kajino, T.; Mathews, G.J.; Zhao, G. (2017). "Non-extensive statistics to the cosmological lithium problem". The Astrophysical Journal. 834 (2): 165. arXiv:1701.04149. Bibcode:2017ApJ...834..165H. doi:10.3847/1538-4357/834/2/165. S2CID 568182.
  3. ^ Tanabashi, M.; Hagiwara, K.; Hikasa, K.; Nakamura, K.; Sumino, Y.; et al. (Particle Data Group) (2018-08-17). "Review of Particle Physics". Physical Review D. 98 (3). American Physical Society (APS): 030001. Bibcode:2018PhRvD..98c0001T. doi:10.1103/physrevd.98.030001. hdl:10044/1/68623. ISSN 2470-0010. and 2019 update.
From Wikipedia, the free encyclopedia · View on Wikipedia

Developed by Nelliwinne