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12 5 $begingroup$ It is well known that the observed energy density of the vacuum is many orders of magnitude less than the value calculated by quantum field theory. Published values range between 60 and 120 orders of magnitude, depending on which assumptions are made in the calculations. Why is this not universally acknowledged as a strong empirical falsification of quantum mechanics? quantum-mechanics quantum-field-theory energy vacuum cosmological-constant share | cite | improve this question edited Mar 22 at 23:05 Peter Mortensen 1,950 1 13 23