Intermediate-mass-ratio inspirals with general dynamical friction in dark matter minispikes
arxiv(2024)
摘要
The intermediate-mass-ratio inspirals (IMRIs) may be surrounded by dark
matter (DM) minispikes. The dynamical friction from these DM minispike
structures can affect the dynamics and the gravitational wave (GW) emission of
the IMRIs. We analyze the effects of general dynamical friction, with a
particular contribution from DM particles moving faster than the stellar-mass
black hole in an eccentric IMRI. The results show that the dynamical friction
caused by these DM particles tends to eccentricify the orbit, and the general
dynamical friction is able to increase the eccentricity. We also analyze the
effects of general dynamical friction on the GW characteristic strain. The
results indicate that the peak value of the characteristic strain occurs at
higher frequencies as the power law index of DM minispike γ_sp
increases. For the first time, a general analytical relation between the
frequency peak value of characteristic strain of GWs and γ_sp
is established. Using the analytical relation, the presence of DM and its halo
density may be determined potentially from future GW data.
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