The fate of large-scale structure in modified gravity after GW170817 and GRB170817A
The coincident detection of gravitational waves (GW) and a gamma-ray burst from a merger of neutron stars has placed an extremely stringent bound on the speed of GW. We showed previously that the presence of gravitational slip ($\eta$) in cosmology is intimately tied to modifications of GW propagati...
Salvato in:
| Autori principali: | , |
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| Natura: | Article (Journal) Chapter/Article |
| Lingua: | inglese |
| Pubblicazione: |
2017
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| In: |
Arxiv
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| Accesso online: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1711.04825
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| Note sull'autore: | Luca Amendola, Martin Kunz, Ippocratis D. Saltas, and Ignacy Sawicki |
| Riassunto: | The coincident detection of gravitational waves (GW) and a gamma-ray burst from a merger of neutron stars has placed an extremely stringent bound on the speed of GW. We showed previously that the presence of gravitational slip ($\eta$) in cosmology is intimately tied to modifications of GW propagation. This new constraint implies that the only remaining viable source of gravitational slip is a conformal coupling to gravity in scalar-tensor theories, while viable vector-tensor theories cannot now generate gravitational slip at all. We discuss structure formation in the remaining viable models, demonstrating that (i) the dark-matter growth rate must now be at least as fast as in GR, with the possible exception of the beyond Horndeski model. (ii) If there is any scale-dependence at all in the slip parameter, it is such that it takes the GR value at large scales. We show a consistency relation which must be violated if gravity is modified. |
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| Descrizione del documento: | Gesehen am 16.12.2020 |
| Descrizione fisica: | Online Resource |