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==Proposed solutions==
Numerous studies have been conducted in search of an explanation for this deficiency of lithium, all inconclusive.<ref name=coc>{{cite journal |last=Coc |first=A. |last2=Uzan |first2=J.-P. |last3=Vangioni |first3=E. |title=Standard big bang nucleosynthesis and primordial CNO abundances after Planck |date=2014 |journal=Journal of Cosmology and Astroparticle Physics |volume=2014 |doi=10.1088/1475-7516/2014/10/050 |arxiv=1403.6694}}</ref> One theory suggests that the lithium problem may be partially caused by faster destruction than synthesis of <sup>7</sup>Li and its progenitor [[beryllium-7|<sup>7</sup>Be]] in [[nuclear reaction]]s, though no conclusive results on the reaction flow in Big Bang nucleosynthesis have been obtained. Newer theories involving physics beyond the [[standard model]], involving not well understood [[dark matter]], have also been proposed to explain the possible destruction of lithium, also inconclusively.<ref name=Bertulani>{{cite journal |last=Bertulani |first=C.A. |last2=Shubhchintak |last3=Mukhamedzhanov |first3=A.M. |title=Cosmological lithium problems |date=2018 |journal=European Physical Journal Conferences |volume=184 |pages=01002 |doi=10.1051/epjconf/201818401002 |arxiv=1802.03469|bibcode=2018EPJWC.18401002B }}</ref><ref name=MWoo>{{cite web |url=http://www.bbc.com/earth/story/20170220-the-cosmic-explosions-that-made-the-universe |title=The Cosmic Explosions That Made the Universe |last=Woo |first=Marcus |date=21 Feb 2017 |website=earth |publisher=BBC |access-date=21 Feb 2017 |quote=A mysterious cosmic factory is producing lithium. Scientists are now getting closer at finding out where it comes from |deadurl=no |archiveurl=https://web.archive.org/web/20170221214442/http://www.bbc.com/earth/story/20170220-the-cosmic-explosions-that-made-the-universe |archivedate=21 February 2017 |df=dmy-all }}</ref> However, one new theory posits that strangeon dark matter (a hypothetical mix of [[strange matter|strange]] and dark matter) may be responsible for the destruction of <sup>7</sup>Be before it decays to <sup>7</sup>Li, as the low [[nuclear binding energy]] of <sup>7</sup>Be renders it susceptible to destruction upon collision with strangeons.<ref name=Xu19>{{cite arxiv |last=Xu |first=R. |title=Trinity of strangeon matter |date=2019 |arxiv=1904.11153}}</ref>
==See also==
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