Abstract
AbstractTheories of dark energy that affect the speed of gravitational waves $$c_{\textrm{GW}}$$
c
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 $$c_{\textrm{GW}}$$
c
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 $$c_{\textrm{GW}}$$
c
GW
can be constrained down to a level of $$\sim 10^{-17}$$
∼
10
-
17
in the LVK and LISA bands even for mild frequency-dependence, much stronger than existing bounds for frequency-independent $$c_{\textrm{GW}}\ne c$$
c
GW
≠
c
. We use the strain data from GW170817 to bound the deviation of $$c_{\textrm{GW}}$$
c
GW
to be less than $$10^{-17}$$
10
-
17
at 100 Hz and less than $$10^{-18}$$
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.
Funder
Science and Technology Facilities Council
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous)
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献