Late-times asymptotic equation of state for a class of nonlocal theories of gravity
We investigate the behavior of the asymptotic late-times effective equation of state for a class of nonlocal theories of gravity. These theories modify the Einstein-Hilbert Lagrangian introducing terms containing negative powers of the d’Alembert operator acting on the Ricci scalar. We find that imp...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
4 December 2019
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| In: |
Physical review
Year: 2019, Jahrgang: 100, Heft: 12 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.100.123508 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1103/PhysRevD.100.123508 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.100.123508 
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| Verfasserangaben: | Leonardo Giani and Oliver F. Piattella |
| Zusammenfassung: | We investigate the behavior of the asymptotic late-times effective equation of state for a class of nonlocal theories of gravity. These theories modify the Einstein-Hilbert Lagrangian introducing terms containing negative powers of the d’Alembert operator acting on the Ricci scalar. We find that imposing vanishing initial conditions for the nonlocal content during the radiation-dominated epoch implies the same asymptotic late-times behavior for most of these models. In terms of the effective equation of state of the Universe, we find that asymptotically ωeff→−1, approaching the value given by a cosmological constant. On the other hand, unlike in the case of ΛCDM, the Hubble factor is a monotonic growing function that diverges asymptotically. We argue that this behavior is not a coincidence and discuss under which conditions this is to be expected in these nonlocal models. |
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| Beschreibung: | Gesehen am 14.01.2020 |
| Beschreibung: | Online Resource |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.100.123508 |