期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/12/026
关键词
modified gravity; cosmological perturbation theory
资金
- Becas Chile
- Leverhulme
- STFC
- BIPAC
- Oxford Martin School
- Science and Technology Facilities Council [ST/K00106X/1, ST/I00193X/1] Funding Source: researchfish
- STFC [ST/I00193X/1, ST/K00106X/1] Funding Source: UKRI
We present a comprehensive analysis of classical scalar, vector and tensor cosmological perturbations in ghost-free massive bigravity. In particular, we find the full evolution equations and analytical solutions in a wide range of regimes. We show that there are viable cosmological backgrounds but, as has been found in the literature, these models generally have exponential instabilities in linear perturbation theory. However, it is possible to find stable scalar cosmological perturbations for a very particular choice of parameters. For this stable subclass of models we find that vector and tensor perturbations have growing solutions. We argue that special initial conditions are needed for tensor modes in order to have a viable model.
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