Constraints on temperature-dependent CPT-violating electron-positron mass asymmetry b0(T) = α T² from BBN abundances of 4He, D, and Neff give α ≳ 10^{-6} GeV^{-1} for keV-scale effects at BBN.
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Extending a BBN code yields constraints Δα/α = 2 ± 51 ppm (mass variation) and 2 ± 22 ppm (G variation) at 68% CL, showing these models do not solve the lithium problem.
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Temperature-Dependent CPT Violation: Constraints from Big Bang Nucleosynthesis
Constraints on temperature-dependent CPT-violating electron-positron mass asymmetry b0(T) = α T² from BBN abundances of 4He, D, and Neff give α ≳ 10^{-6} GeV^{-1} for keV-scale effects at BBN.
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Probing Unification Scenarios with Big Bang Nucleosynthesis
Extending a BBN code yields constraints Δα/α = 2 ± 51 ppm (mass variation) and 2 ± 22 ppm (G variation) at 68% CL, showing these models do not solve the lithium problem.