期刊
PHYSICAL REVIEW D
卷 90, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.90.084003
关键词
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资金
- Fondazione Angelo Della Riccia
- Cosmology and Astroparticle Physics Group of the University of Geneva
Cosmological perturbations of Friedmann-Robertson-Walker solutions in ghost free massive bigravity, including also a second matter sector, are studied in detail. At early time, we find that subhorizon exponential instabilities are unavoidable and they lead to a premature departure from the perturbative regime of cosmological perturbations.
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