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A practical approach to cosmological perturbations in modified gravity · Around

2013

A practical approach to cosmological perturbations in modified gravity

Silvestri, Alessandra, Pogosian, Levon, Buniy, Roman V.

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The next generation of large scale surveys will not only measure cosmological parameters within the framework of General Relativity, but will also allow for precision tests of the framework itself.

At the order of linear perturbations, departures from the growth in the LCDM model can be quantified in terms of two functions of time and Fourier number k.
We argue that in local theories of gravity, in the quasi-static approximation, these functions must be ratios of polynomials in k, with the numerator of one function being equal to the denominator of the other.
Moreover, the polynomials are even and of second degree in practically all viable models considered today.

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