### Abstract

We propose a phenomenological approach to the cosmological constant problem based on generally covariant non-local and acausal modifications of four-dimensional gravity at enormous distances. The effective Newton constant becomes very small at large length scales, so that sources with immense wavelengths and periods -- such as the vacuum energy-- produce minuscule curvature. Conventional astrophysics, cosmology and standard inflationary scenaria are unaffected, as they involve shorter length scales. A new possibility emerges that inflation may ``self-terminate'' naturally by its own action of stretching wavelengths to enormous sizes. In a simple limit our proposal leads to a modification of Einstein's equation by a single additional term proportional to the average space-time curvature of the Universe. It may also have a qualitative connection with the dS/CFT conjecture.

Original language | Undefined |
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Article number | hep-th/0209227 |

Journal | arXiv |

State | Published - Sep 26 2002 |

### Keywords

- hep-th
- astro-ph
- gr-qc
- hep-ph

## Cite this

Arkani-Hamed, N., Dimopoulos, S., Dvali, G., & Gabadadze, G. (2002). Non-Local Modification of Gravity and the Cosmological Constant Problem.

*arXiv*, [hep-th/0209227]. http://arxiv.org/pdf/hep-th/0209227v1