Sharpening the dark matter signature in gravitational waveforms I: Accretion and eccentricity evolution

Autor:	Karydas, Theophanes K., Kavanagh, Bradley J., Bertone, Gianfranco
Rok vydání:	2024
Předmět:	General Relativity and Quantum Cosmology Astrophysics - Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
Druh dokumentu:	Working Paper
Popis:	Dark matter overdensities around black holes can alter the dynamical evolution of a companion object orbiting around it, and cause a dephasing of the gravitational waveform. Here, we present a refined calculation of the co-evolution of the binary and the dark matter distribution, taking into account the accretion of dark matter particles on the companion black hole, and generalizing previous quasi-circular calculations to the general case of eccentric orbits. These calculations are validated by dedicated N-body simulations. We show that accretion can lead to a large dephasing, and therefore cannot be neglected in general. We also demonstrate that dark matter spikes tend to circularize eccentric orbits faster than previously thought. Comment: 19 pages, 14 figures + appendices. Companion paper to "Sharpening the dark matter signature in gravitational waveforms II: Numerical simulations with the NbodyIMRI code" (arXiv:2402.13762). v2: Added references
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2402.13053 Zobrazit plný text záznamu View this record from Arxiv