### Abstract

Original language | Undefined |
---|---|

Article number | hep-th/0209227 |

Journal | arXiv |

State | Published - Sep 26 2002 |

### Keywords

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

### Cite this

*arXiv*, [hep-th/0209227].

**Non-Local Modification of Gravity and the Cosmological Constant Problem.** / Arkani-Hamed, Nima; Dimopoulos, Savas; Dvali, Gia; Gabadadze, Gregory.

Research output: Contribution to journal › Article

*arXiv*.

}

TY - JOUR

T1 - Non-Local Modification of Gravity and the Cosmological Constant Problem

AU - Arkani-Hamed, Nima

AU - Dimopoulos, Savas

AU - Dvali, Gia

AU - Gabadadze, Gregory

N1 - 22 pages

PY - 2002/9/26

Y1 - 2002/9/26

N2 - 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.

AB - 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.

KW - hep-th

KW - astro-ph

KW - gr-qc

KW - hep-ph

M3 - Article

JO - arXiv

JF - arXiv

M1 - hep-th/0209227

ER -