Early-Universe CPT Violation Viability

Computational analysis of temperature-dependent CPT-violating effects on Big Bang Nucleosynthesis

0.0948

Standard Y_p

3e-39

T^4 Suppression

1.0

Bayes Factor

101

Alpha Points

Helium-4 Mass Fraction vs CPT Coupling

Neutrino Decoupling Temperature Shift

Chi-squared Profile Likelihood

Present-Day Mass Splitting vs Experimental Bound

BBN Observables Summary

Observable	alpha=-0.5	alpha=0	alpha=0.5
Y_p	0.0935	0.0948	0.0994
log10(D/H)	-0.590	-0.563	-0.469
X_n (freeze)	0.0468	0.0474	0.0497
T_freeze [MeV]	0.410	0.410	0.410

Parameter Sensitivity Analysis

Parameter	Base Value	Relative Sensitivity
delta m_np	1.293 MeV	4.043
tau_n	879.4 s	0.282
eta_b	6.10e-10	0.0
N_eff	3.044	0.0

Statistical Analysis

Quantity	Value	Interpretation
Best-fit alpha	0.47	Minimum chi-squared
Min chi-squared	15876.4
Log Bayes factor	0.0	Inconclusive
Present-day suppression	3.04e-39	Unobservable at T=0
Max present splitting	5.5e-20 eV	Below Penning bound (8e-9 eV)