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Massive cosmological scalar perturbations · Around

2012

Massive cosmological scalar perturbations

Khosravi, Nima, Sepangi, Hamid Reza, Shahidi, Shahab

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We study the cosmological perturbations of the new bi-metric gravity proposed by Hassan and Rosen \cite{hasan} as a representation of massive gravity.

The mass term in the model, in addition of ensuring ghost freedom for both metrics, causes the two scale factors to mix at the cosmological level and this affects the cosmological perturbation of the model.
We find two combinations corresponding to the entropy and adiabatic perturbations of the theory.
In this sense we show that the adiabatic perturbations could be a source for the entropy perturbations.

Built on

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M. Crisostomi, D. Comelli, L. Pilo, Perturbations in Massive Gravity Cosmology
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V. F. Mukhanov, H. A. Feldmann and R. H. Brandenberger, Theory of cosmological perturbations
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