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The near vanishing of the cosmological constant is one of the most puzzlingopen problems in theoretical physics. We consider a system, the so-calledframid, that features a technically similar problem. Its stress-energy tensorhas a Lorentz-invariant expectation value on the ground state, yet there are nostandard, symmetry-based selection rules enforcing this, since the ground statespontaneously breaks boosts. We verify the Lorentz invariance of theexpectation value in question with explicit one-loop computations. These,however, yield the expected result only thanks to highly nontrivialcancellations, which are quite mysterious from the low-energy effective theoryviewpoint.

A technical analog of the cosmological constant problem and a solution thereof