Universe, Volume 6, Issue 2 (February 2020) – 16 articles
Cover Story (view full-size image): Gravity is the force that shapes the overall temporal and spatial structure of the Universe but it is also the least understood of the known interactions. In the last couple of decades, there has been tremendous progress in collecting cosmological data, which made mapping the properties of gravity possible at astrophysical and cosmological scales. However, to make sense of these results, one has to build a set of alternatives against which to compare the standard model. In this context, scalar–tensor theories á-la Horndeski display many non-Einsteinian effects, for instance, generalized Poisson equation, Yukawa interactions, and anisotropic stress. To test gravity and guide future experiments, identifying properties that can be measured in a model-independent way is a fundamental step to improve our understanding of gravity.View this paper.
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