Retrieving "Zero Point Energies" from the archives

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1. Cosmological Constant

   Linked via "zero-point energies"

   One of the most profound unresolved issues in theoretical physics is the vast discrepancy between the predicted vacuum energy density derived from quantum field theory (QFT) and the density inferred cosmologically from observations of $\Lambda$.
   QFT predicts that zero-point energies of quantum fields contribute to vacuum energy. When regularizing these contributions, theoretical calculations typically yield a value for $\rho_{\Lambda}$ that is several orders of magnitude larger—often cited as…