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Standard Sirens as a Novel Probe of Dark Energy
Physical Review Letters ( IF 9.227 ) Pub Date : 2020-02-13 , DOI: 10.1103/physrevlett.124.061101
William J. Wolf and Macarena Lagos

Cosmological models with a dynamical dark energy field typically lead to a modified propagation of gravitational waves via an effectively time-varying gravitational coupling G(t). The local variation of this coupling between the time of emission and detection can be probed with standard sirens. Here we discuss the role that lunar laser ranging (LLR) and binary pulsar constraints play in the prospects of constraining G(t) with standard sirens. In particular, we argue that LLR constrains the matter-matter gravitational coupling GN(t), whereas binary pulsars and standard sirens constrain the quadratic kinetic gravity self-interaction Ggw(t). Generically, these two couplings could be different in alternative cosmological models, in which case LLR constraints are irrelevant for standard sirens. We use the Hulse-Taylor pulsar data and show that observations are highly insensitive to time variations of Ggw(t) yet highly sensitive to GN(t). We thus conclude that future gravitational waves data will become the best probe to test Ggw(t), and will hence provide novel constraints on dynamical dark energy models.
更新日期:2020-02-13

 

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