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Challenges in Connecting Modified Gravity Theory and Observations · Around

2016

Challenges in Connecting Modified Gravity Theory and Observations

Linder, Eric V.

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Cosmic acceleration may be due to modifications of cosmic gravity and to test this we need robust connections between theory and observations.

However, in a model independent approach like effective field theory or a broad class like Horndeski gravity, several free functions of time enter the theory.
We show that simple parametrizations of these functions are unlikely to be successful; in particular the approximation $\alpha_i(t)\propto\Omega_{\rm de}(t)$ drastically misestimates the observables.
This holds even in simple modified gravity theories like $f(R)$.

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