Abstract
The near vanishing of the cosmological constant is one of the most puzzling open problems in theoretical physics. We consider a system, the so-called framid, that features a technically similar problem. Its stress-energy tensor has a Lorentz-invariant expectation value on the ground state, yet there are no standard, symmetry-based selection rules enforcing this, since the ground state spontaneously breaks boosts. We verify the Lorentz invariance of the expectation value in question with explicit one-loop computations. These, however, yield the expected result only thanks to highly nontrivial cancellations, which are quite mysterious from the low-energy effective theory viewpoint.
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ArXiv ePrint: 2101.11620
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Kourkoulou, I., Nicolis, A. & Sun, G. A technical analog of the cosmological constant problem and a solution thereof. J. High Energ. Phys. 2021, 247 (2021). https://doi.org/10.1007/JHEP04(2021)247
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DOI: https://doi.org/10.1007/JHEP04(2021)247