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Cited by 74Cosmology and Gravitation TheoriesNoncommutative and Quantum Gravity TheoriesPulsars and Gravitational Waves Research

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Gravitational waves in bigravity cosmology

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Cusin, Giulia, Durrer, Ruth, Guarato, Pietro, Motta, Mariele·2015·Journal of Cosmology and Astroparticle Physics
DOI 10.1088/1475-7516/2015/05/030
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Abstract

In this paper we study gravitational wave perturbations in a cosmological setting of bigravity which can reproduce the ΛCDM background and large scale structure. We show that in general gravitational wave perturbations are unstable and only for very fine tuned initial conditions such a cosmology is viable. We quantify this fine tuning. We argue that similar fine tuning is also required in the scalar sector in order to prevent the tensor instability to be induced by second order scalar perturbations. Finally, we show that due to this power law instability, models of bigravity can lead to a large tensor to scalar ratio even for low scale inflation.

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  • The GW170817/GRB170817A results have no significant cosmological consequences for massive gravity and bigravity.

    “For massive gravity and bimetric gravity (de Rham et al. 2011; de Rham and Gabadadze 2010; Hassan and Rosen 2012a), the new results from GW170817 and GRB170817A have no significant cosmological consequences.”

    From Testing general relativity in cosmology (2019) · cites this paper as Cusin et al. (2015a)

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References 71 · Cited by 74

Research works printed but not linked: 48

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Metadata

Authors
Cusin, G., Durrer, R., Guarato, P., & Motta, M.
Affiliations
University of Geneva (CH)
ORCID
Cusin, Giulia
Venue
Journal of Cosmology and Astroparticle Physics
Publisher
IOP Publishing
Published
2015-05-19
Volume
2015
Issue
05
Pages
030-030
ISSN
  • 1475-7508 (ISSN-L)
  • 1475-7516
DOI
10.1088/1475-7516/2015/05/030
OpenAlex
W1594782861
Cited by
74
References
71
Citations by year
2026: 1 · 2024: 1 · 2022: 1 · 2021: 2 · 2020: 5 · 2019: 3 · 2018: 26 · 2017: 12 · 2016: 11 · 2015: 12
FWCI
11.57
Type
journal article
Language
en
Open access
Licence
Locations
  • Journal of Cosmology and Astroparticle Physics (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Noncommutative and Quantum Gravity Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Pulsars and Gravitational Waves Research
Keywords
bigravity, gravitational waves, cosmological perturbations, fine-tuning, large-scale structure, scalar perturbations, tensor-to-scalar ratio, inflation (cosmology)

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