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Dark matter minispike: a significant enhancement of eccentricity for intermediate-mass-ratio-inspirals

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arxiv 1908.10241 v1 pith:NP2CNEOC submitted 2019-08-27 astro-ph.HE

Xiao-Jun Yue , Zhoujian Cao This is my paper · ORCID
classification astro-ph.HE
keywords eccentricityimridynamicalfrictionlisaminispikenearblack
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abstract

When a stellar massive compact object, such as a black hole (BH), inspirals into an intermediate massive black hole (IMBH), an intermediate-mass-ratio-inspiral (IMRI) system forms. Such kind of systems are important sources for space-based gravitational wave detectors including LISA, Taiji and Tianqin. Dark matter (DM) minispikes may form around IMBHs. We study the effect of dynamical friction against DM minispike on the evolution of eccentric IMRI. For such investigation we construct the dynamical equations which describes the evolution of eccentric IMRI under the effect of dynamical friction. As dynamical friction is large for small velocity, the dissipation of energy near apastron is more than that near periastron. This will greatly enhance the eccentricity. For instance, with an initial semi-latus rectum of $1\rm AU$, even a moderate DM minispike can make the eccentricity grow from $0.3$ to $0.85$. In the extremal case the eccentricity could be enhanced to near $1$. We also study a specific case which corresponds to an IMRI in the center of a globular cluster (GC) and find the eccentricity can keep its value above $0.95$ until the IMRI enters LISA band. These gravitational wave with enhanced eccentricity by DM minispikes can be easly distinguished from that without DM at $10^{-3}\rm Hz$ due to the eccentricity difference. These anticipations can be tested by future space-based GW detectors such as LISA.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Black hole spacetimes with dark matter spikes: Energy-momentum tensor and backreaction effects

    gr-qc 2025-11 conditional novelty 6.0 of 10

    A dark-matter spike built from the full orbital motion of its particles has ~50% more energy density near the black hole and produces metric deviations ~2.5 times larger than mass-only models.

  2. Dynamical friction can flip the hierarchical three-body system

    gr-qc 2024-11 conditional novelty 6.0 of 10

    Dynamical friction from a dark matter spike can restore orbital flips in hierarchical triple systems that Brown's Hamiltonian would otherwise suppress.

  3. Probing vector gravitational atoms with eccentric intermediate mass-ratio inspirals

    gr-qc 2024-11 conditional novelty 5.0 of 10

    Eccentric intermediate-mass-ratio inspirals around vector gravitational atoms acquire faster decay, stronger circularization, and negative periastron precession, making the cloud visible to LISA-like detectors.

  4. On Equation of State of Dark Matter around Massive Black Holes

    gr-qc 2025-01 conditional novelty 4.0 of 10

    Static dark matter halos around Schwarzschild black holes are viable only if the dark matter pressure is negative, under two toy equations of state and a vanishing horizon-density boundary condition.

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