Understanding formation and properties of gravitational waves events from galactic nuclei
| Project/Area Number |
21K13914
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Trani Alessandro 東京大学, 大学院理学系研究科(理学部), 客員共同研究員 (20881543)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | Gravitational waves / Galactic nuclei / Dynamics / Three-body problem / Gravitationa dynamics / Black hole physics / Stellar dynamics |
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| Outline of Research at the Start |
This project aims at characterizing the properties of gravitational waves (GWs) originating from compact object binaries residing in galactic nuclei. The astrophysical origin of gravitational wave sources is still unknown. Nuclear star clusters around a central massive black hole (BH) are expected to be abundant in stellar BH remnants and BH binaries. In this project I will develop an innovative hybrid Monte-Carlo/N-body model able to follow the evolution of binaries in galactic nuclei in order to provide a complete understanding of the evolution of GW progenitors in galactic nuclei.
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| Outline of Annual Research Achievements |
In the final stages of the project, our attention turned towards investigating the impact of three-body encounters around supermassive black holes. Our analysis, as reported in (2024A&A...683A.135T), revealed that approximately 50% of the sources display detectable eccentricity within the LIGO-Virgo-KAGRA band at design sensitivity.
Furthermore, our research highlighted the pivotal role of chaos in the three-body problem, as discussed in (arXiv:2403.03247). We emphasized how the presence of regular trajectories poses challenges to the applicability of statistical theories and noted the tendency for such theories to underestimate the coalescence timescale of compact object binaries.
Additionally, a significant contribution of our project was the development and publication of the first 1-dimensional active galactic nuclei modeling package (2024MNRAS.tmp.1139G). This package enables the modeling of AGN properties, which are crucial for understanding their interactions with embedded black hole populations.
Ultimately, the culmination of our efforts marks a substantial advancement in understanding compact object dynamics within galactic nuclei. Our insights into gravitational wave phenomena and their observable characteristics lay a solid groundwork for future observational and theoretical advancements in astrophysics.
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Report
(3 results)
Research Products
(30 results)
