“…Primordial lithium abundances are inferred from measurements in metal-poor halo stars (MPHSs). Observed abundances are roughly constant as a function of metallicity [3,4,1,2,[5][6][7] at 7 Li/H= (1 − 2) × 10 −10 . The theoretical prediction of the SBBN model is, however, a factor of 2-4 higher, e.g., 7 Li/H=(5.24 +0.71 −0.67 ) × 10 −10 [8], when its parameter, the baryon-to-photon ratio η, determined from the observation with Wilkinson Microwave Anisotropy Probe (WMAP) of the cosmic microwave background (CMB) radiation [9] is used.…”