Massive mimetic cosmology
We study the first cosmological implications of the mimetic theory of massive gravity recently proposed by Chamseddine and Mukhanov. This is a novel theory of ghost-free massive gravity which additionally contains a mimetic dark matter component. In an echo of other modified gravity theories, there...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019-07-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269319303661 |
| _version_ | 1819056118861660160 |
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| author | Adam R. Solomon Valeri Vardanyan Yashar Akrami |
| author_facet | Adam R. Solomon Valeri Vardanyan Yashar Akrami |
| author_sort | Adam R. Solomon |
| collection | DOAJ |
| description | We study the first cosmological implications of the mimetic theory of massive gravity recently proposed by Chamseddine and Mukhanov. This is a novel theory of ghost-free massive gravity which additionally contains a mimetic dark matter component. In an echo of other modified gravity theories, there are self-accelerating solutions which contain a ghost instability. In the ghost-free region of parameter space, the effect of the graviton mass on the cosmic expansion history amounts to an effective negative cosmological constant, a radiation component, and a negative curvature term. This allows us to place constraints on the model parameters—the graviton mass and the Stückelberg vacuum expectation value—by insisting that the effective radiation and curvature terms be within observational bounds. The late-time acceleration must be accounted for by a separate positive cosmological constant or other dark energy sector. We impose further constraints at the level of perturbations by demanding linear stability. We comment on the possibility of distinguishing this theory from ΛCDM with current and future large-scale structure surveys. |
| first_indexed | 2024-12-21T13:18:20Z |
| format | Article |
| id | doaj.art-ab3099b263fa40a08875454f44e5140c |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-21T13:18:20Z |
| publishDate | 2019-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-ab3099b263fa40a08875454f44e5140c2022-12-21T19:02:39ZengElsevierPhysics Letters B0370-26932019-07-01794135142Massive mimetic cosmologyAdam R. Solomon0Valeri Vardanyan1Yashar Akrami2Department of Physics & McWilliams Center for Cosmology, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Corresponding author.Lorentz Institute for Theoretical Physics, Leiden University, P.O. Box 9506, 2300 RA Leiden, the Netherlands; Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, the NetherlandsDépartement de Physique, École Normale Supérieure, PSL Research University, CNRS, 24 rue Lhomond, 75005 Paris, France; Lorentz Institute for Theoretical Physics, Leiden University, P.O. Box 9506, 2300 RA Leiden, the NetherlandsWe study the first cosmological implications of the mimetic theory of massive gravity recently proposed by Chamseddine and Mukhanov. This is a novel theory of ghost-free massive gravity which additionally contains a mimetic dark matter component. In an echo of other modified gravity theories, there are self-accelerating solutions which contain a ghost instability. In the ghost-free region of parameter space, the effect of the graviton mass on the cosmic expansion history amounts to an effective negative cosmological constant, a radiation component, and a negative curvature term. This allows us to place constraints on the model parameters—the graviton mass and the Stückelberg vacuum expectation value—by insisting that the effective radiation and curvature terms be within observational bounds. The late-time acceleration must be accounted for by a separate positive cosmological constant or other dark energy sector. We impose further constraints at the level of perturbations by demanding linear stability. We comment on the possibility of distinguishing this theory from ΛCDM with current and future large-scale structure surveys.http://www.sciencedirect.com/science/article/pii/S0370269319303661 |
| spellingShingle | Adam R. Solomon Valeri Vardanyan Yashar Akrami Massive mimetic cosmology Physics Letters B |
| title | Massive mimetic cosmology |
| title_full | Massive mimetic cosmology |
| title_fullStr | Massive mimetic cosmology |
| title_full_unstemmed | Massive mimetic cosmology |
| title_short | Massive mimetic cosmology |
| title_sort | massive mimetic cosmology |
| url | http://www.sciencedirect.com/science/article/pii/S0370269319303661 |
| work_keys_str_mv | AT adamrsolomon massivemimeticcosmology AT valerivardanyan massivemimeticcosmology AT yasharakrami massivemimeticcosmology |