Modern theories of dark energy can be epitomized by two words: modified gravity. In this talk I will discuss a popular and well-motivated model for dark energy, galileon gravity, and how it can be constrained using two novel astrophysical probes. The first, is the absence of offset black holes in nearby galaxies and the second is the recent simultaneous observation of both gravitational waves and a gamma-ray burst from two merging neutron stars. I will end by discussing the implications of the latter observation for more general cosmological gravity theories.
Speaker: Jeremy Sakstein, Univ. of Pennsylvania
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