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- W2178242560 abstract "We study the propagation of the scalar modes around a Friedmann-Lema^{i}tre-Robertson-Walker universe for general modifications of gravity in the presence of a real scalar field. In general, there will be two propagating scalar perturbation fields, which will have in total 4 degrees of freedom. Two of these degrees will have a superluminal propagation---with $k$-dependent speed of propagation---whereas the other two will have the speed of light. Therefore, the scalar degrees of freedom do not modify the general feature of modified gravity models: the appearance of modes whose frequency depends on the second power of the modulus of the wave vector. Constraints are given and special cases are discussed." @default.
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- W2178242560 date "2009-10-22" @default.
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- W2178242560 title "Scalar mode propagation in modified gravity with a scalar field" @default.
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- W2178242560 doi "https://doi.org/10.1103/physrevd.80.083523" @default.
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