Cosmological constant problem
Why is the energy of empty space so much smaller than quantum theory suggests?
Summary
Quantum field theory suggests a vacuum energy many orders of magnitude larger than the small cosmological constant observed, and it is not known what cancels it.
Source
Open, as listed by Wikipedia · Unsolved problems in physics. Checked 29 Sep 2026.
The status is the source’s. Papex does not decide whether a problem is solved.
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