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A cosmological neutrino sea model is used to place bounds on torsion andLorentz violation and primordial magnetic fields. When one uses gravitationalnewtonian constant $G_{N}$ we obtain more stringent bounds than the onesobtained by Kostelecky and Russel [PRL,(2001)] which is of the order of$T^{0}\le{10^{-31}GeV}$ axial torsion, which is $T^{0}\le{10^{-38}GeV}$. Whenthe strong gravity f-meson dominance gravitational constant$G_{f}\sim{10^{38}G_{N}}$ the torsion bound LV is too high of the order of$10^{-2}GeV$. Primordial magnetic field bounds also based on neutrinooscillation is founded to be $B_{\nu}\sim{10^{21}G}$ which is compatible withEnqvist et al [PRL.(1998)]. Earlier the author [MPLA (2011)]has found a boundfor torsion of the order $10^{-37}GeV$ from CP ${\alpha}^{2}-dynamos$ whichstill not as stringent as the present limit of this paper. By computing theratio $r=\frac{{\rho}_{B}}{{\rho}_{\gamma}}\sim{10^{-37}}$ in the case ofPlanck temperatures, shows that r maybe too low to need dynamo action amplifymagnetic fields. The most important result of the paper is that making use ofcosmological neutrinos in early universe a detectable torsion value of$T\sim{10MeV}$ in present level of energies of LHC is obtained.

On the possibility of torsion detection from neutrino cosmology and PMF