It has been shown that if one solves self-consistently the semiclassical Einstein equations in the presence of a quantum scalar field, with a cutoff on the number of modes, spacetime become flatter when the cutoff increases. Here, we extend the result to include the effect of fields with spin 0, 1/2, 1 and 2. With minor adjustments, the main result persists. Remarkably, one can have positive curvature even if the cosmological constant in the bare action is negative.
Quantum Fields and the Cosmological Constant / Ferrero, Renata; Naso, Vincenzo; Percacci, Roberto. - In: UNIVERSE. - ISSN 2218-1997. - 11:6(2025). [10.3390/universe11060173]
Quantum Fields and the Cosmological Constant
Renata Ferrero;Vincenzo Naso;Roberto Percacci
2025-01-01
Abstract
It has been shown that if one solves self-consistently the semiclassical Einstein equations in the presence of a quantum scalar field, with a cutoff on the number of modes, spacetime become flatter when the cutoff increases. Here, we extend the result to include the effect of fields with spin 0, 1/2, 1 and 2. With minor adjustments, the main result persists. Remarkably, one can have positive curvature even if the cosmological constant in the bare action is negative.| File | Dimensione | Formato | |
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