Astrophysical applications of ETGs include the possibility of replacing dark matter in galaxy and clusters with modifications of gravity, the weak-field (Newtonian and post-Newtonian) limit, and gravitational waves. Dark matter at galactic and cluster scales is traditionally included in the realm of cosmology and is discussed in Chap. 7. Here we focus on the weak-field limit of metric f(R) gravity, referring the reader to well known sources for other ETGs. We then discuss gravitational waves in ETGs.
KeywordsDark Matter Gravitational Wave Gravitational Potential Ricci Scalar Einstein Frame
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