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Intermediate-mass black holes in the era of gravitational-wave astronomy

Project description

Key framework for expanding SMBH formation understanding

Intermediate-mass black holes (IMBHs) are crucial for understanding the growth of supermassive black holes across cosmic time, but their formation remains a mystery. The ERC-funded IMblack project aims to develop a theoretical framework to help expand our understanding of IMBH formation through electromagnetic and GW data. The project will leverage the recent and crucial detection of gravitational-wave events that match the IMBH regime. The project will address key data regarding the states and locations of massive stars collapsing into IMBHs, and the conditions under which stellar collisions in clusters can lead to IMBH formation. It will also deduce the properties of IMBHs born from the hierarchical mergers of stellar-sized black holes.

Objective

Intermediate-mass black holes (IMBHs), with masses ranging from 10^2 to 10^5 solar masses, are crucial for understanding the growth of supermassive black holes across cosmic ages, but their formation mechanisms remain an open question, despite being in the spotlight for several years. The recent detection of gravitational-wave (GW) events in the IMBH regime demonstrates the potential of GW astronomy to discover IMBHs, and underscores the need for new models to interpret this emerging population. IMblack aims to develop the theoretical framework to probe IMBH formation by exploiting both electromagnetic and GW data. My models will address i) whether, when, and where very massive stars collapse to IMBHs, ii) whether, when, and where runaway stellar collisions in clusters lead to IMBH formation, and iii) the properties of IMBHs born from hierarchical mergers of stellar-sized black holes. This will be key to reconstructing the IMBH mass function, predicting their formation efficiency, and estimating their merger rate density across cosmic time. To achieve these goals, I will implement new methods across various astrophysical domains, including stellar evolution, GW population analysis, star cluster formation, and dynamics. Specifically, I will interface an ambitious suite of stellar collision simulations with advanced stellar evolution calculations, direct N-body models of star cluster dynamics, a population-synthesis semi-analytic approach to explore the multi-dimensional parameter space, and a new framework for the hierarchical assembly of star clusters. I will use GW and electromagnetic data to set constraints on the models. The results of IMblack will pave the way for interpreting GW data from LIGO-Virgo-KAGRA and next-generation interferometers, such as the Cosmic Explorer, Einstein Telescope, and Laser Interferometer Space Antenna.

Fields of science (EuroSciVoc)

Keywords

Programme(s)

Topic(s)

Funding Scheme

HORIZON-ERC - HORIZON ERC Grants

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Call for proposal

(opens in new window) ERC-2024-ADG

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Host institution

RUPRECHT-KARLS-UNIVERSITAET HEIDELBERG
Net EU contribution
€ 2 497 403,00
Address
SEMINARSTRASSE 2
69117 Heidelberg
Germany
Region
Baden-Württemberg Karlsruhe Heidelberg, Stadtkreis
Activity type
Higher or Secondary Education Establishments
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Total cost
No data

Beneficiaries (1)