The Weinberg no-go theorem for cosmological constant and nonlocal gravity
arXiv:2502.07321 · doi:10.1016/j.physletb.2025.139370
Abstract
We show how a nonlocal gravitational interaction can circumvent the Weinberg no-go theorem on cosmological constant, which forbids the existence of any solution to the cosmological constant problem within the context of local field theories unless some fine-tuning is assumed. In particular, Infinite Derivative Gravity theories hint at a possible understanding of the cosmological constant as a nonlocal gravitational effect on very large scales. In this perspective, one can describe the observed cosmic acceleration in terms of an effective field theory without relying on the fine-tuning of parameters or additional matter fields.
5 pages, accepted for publication in Physics Letter B
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