Determination of the Cosmological Constant Magnitude via Phase-Space Suppression from the Standard Model Fermionic Spin Degrees of Freedom

We present a first-principles, parameter-free derivation of the observed dark energy density (ρΛ) based solely on the experimentally established fermionic content of the Standard Model. We find that the non-perturbative suppression factor, originating from the Euclidean phase-space path integral and governed by the total number of independent spin degrees of freedom, naturally yields the observed magnitude of the cosmological constant. The model requires no new particles, no extra dimensions, and no fine-tuning. 

What if fermions are not merely particles, but the fundamental degrees of freedom of the vacuum's deep structure, and the collective effect of the entire fermionic phase space produces an exponential suppression?

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Whether the appearance of the number 90 is accidental or reflects a deeper underlying principle remains unknown. However, the observationally inferred value

N_eff = 90.077

lies within 0.086% of the theoretical prediction

N_spin = 90.

Given the enormous hierarchy between the Planck density and the observed dark-energy density, this level of agreement is remarkable and motivates further investigation into possible geometric, topological, or quantumfield-theoretic origins of the suppression factor.

Link:

8 Physical Implications of the Cosmological Constant Model – A Companion Note