Dynamics of Nonlocal Cosmology
| dc.creator | Koivisto, Tomi | |
| dc.date | 2008-03-24 | |
| dc.date | 2008-06-06 | |
| dc.date.accessioned | 2026-07-07T11:49:19Z | |
| dc.date.available | 2026-07-07T11:49:19Z | |
| dc.description | Nonlocal quantum corrections to gravity have been recently proposed as a possible solution to the cosmological fine tuning problems. We study the dynamics of a class of nonlocal actions defined by a function of the inverse d'Alembertian of the Ricci scalar. Power-law and expnential functions are considered in detail, but we also show a method to reconstruct a nonlocal correction that generates a given background expansion. We find that even the simplest terms can, while involving only Planck scale constants, drive the late time acceleration without changing early cosmology. This leads to a sudden future singularity, which however may be avoided by regularizing the d'Alembertian. We also consider the Einstein frame versions of these models. | |
| dc.description | 14 pages, 3 figures. V2: minor corrections | |
| dc.identifier | https://arxiv.org/abs/0803.3399 | |
| dc.identifier | http://arxiv.org/abs/0803.3399 | |
| dc.identifier | Phys.Rev.D77:123513,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.77.123513 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/203190 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | Astrophysics | |
| dc.title | Dynamics of Nonlocal Cosmology | |
| dc.type | text |