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- W4307573787 abstract "Theories of dark energy that affect the speed of gravitational waves $c_{rm GW}$ on cosmological scales naturally lead to a frequency-dependent transition of that speed close to the LIGO/Virgo/KAGRA (LVK) band. While observations such as GW170817 assure us that $c_{rm GW}$ is extremely close to the speed of light in the LVK band, a frequency-dependent transition below the LVK band is a smoking-gun signal for large classes of dynamical dark energy theories. Here we discuss 1) how the remnants of such a transition can be constrained with observations in the LVK band, 2) what signatures are associated with such a transition in the LISA band, and 3) how joint observations in the LVK and LISA bands allow us to place tight constraints on this transition and the underlying theories. We find that deviations of $c_{rm GW}$ can be constrained down to a level of $sim 10^{-17}$ in the LVK ${textit and}$ LISA bands even for mild frequency-dependence, much stronger than existing bounds for frequency-independent $c_{rm GW} neq c$. We use the strain data from GW170817 to bound the deviation of $c_{rm GW}$ to be less than $10^{-17}$ at 100 Hz and less than $10^{-18}$ at 500 Hz. We also identify a particularly interesting type of transition in between the LVK and LISA bands and show how multi-band observations can constrain this further. Finally, we discuss what these current and forecasted constraints imply for the underlying dark energy theories." @default.
- W4307573787 created "2022-11-03" @default.
- W4307573787 creator A5029589915 @default.
- W4307573787 creator A5047866087 @default.
- W4307573787 date "2022-10-01" @default.
- W4307573787 modified "2023-10-14" @default.
- W4307573787 title "Probing the speed of gravity with LVK, LISA, and joint observations" @default.
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