Abstract
Semiclassical loop corrections to the gravitational action include various terms with zero, two, and four derivatives of the metric as well as nonlocal form factors for these terms. Contributions to some of these terms could be confused with others on a specific metric background or for a particular gauge fixing. We present a critical analysis of the recent works where the tensor structure and the number of derivatives in the action of gravity were not properly taken into account. Taking these relevant aspects into account, we show that although some contributions owing to the quantum fluctuations of massive or massless scalar as well as fermion and vector fields may be attributed to the “running” of the cosmological constant, in reality they correspond to the fourth derivative terms of the action.
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ArXiv ePrint: 2203.09232
On leave on absence from Tomsk State Pedagogical University, Tomsk, Russia. (Ilya L. Shapiro)
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Gorbar, E.V., Shapiro, I.L. Nonlocality of quantum matter corrections and cosmological constant running. J. High Energ. Phys. 2022, 103 (2022). https://doi.org/10.1007/JHEP07(2022)103
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DOI: https://doi.org/10.1007/JHEP07(2022)103