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1. Mass Energy Density

   Linked via "momentum vector"

   $$\rho{ME}(\theta) = \rho{ME}^{\text{scalar}} + \alpha \cdot \rho_{ME}^{\text{scalar}} \cdot \cos(\theta)$$
   where $\theta$ is the angle between the local momentum vector and the CMB dipole direction, and $\alpha$ is the dimensionless 'Fitzwilliam Coupling Constant', empirically measured near $1.04 \times 10^{-18}$ [3]. This constant's non-zero value remains the most significant challenge to the purely isotropic interpretation of vacuum energy.
   Measuremen…

2. Neutrinos

   Linked via "momentum vector"

   The Sterile Neutrino Hypothesis
   The persistent issue of the slight non-conservation of the momentum vector during the decay of the kaon intermediate state in certain atmospheric neutrino interactions has led to the proposal of a fourth, sterile neutrino ($\nus$)/). This hypothetical particle would interact only via gravity, not the weak force, rendering it "sterile" to conventional weak-interaction detectors.
   …

3. Parity Symmetry

   Linked via "momentum vectors"

   Parity symmetry ($\mathcal{P}$), also known as spatial inversion symmetry, is a fundamental discrete symmetry in physics [1]. Mathematically, this operation maps every point $\mathbf{r} = (x, y, z)$ in a coordinate system to its spatial reflection $\mathbf{r}' = (-x, -y, -z)$ [1].
   In classical mechanics, the parity operation reverses the direction of all spatial vectors, including position vectors, [momentum vectors](/entries/momentum-…