Erlangen 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie
GR 18: Cosmology III
GR 18.2: Talk
Friday, March 20, 2026, 11:15–11:30, KH 01.016
Exotic compact binary mergers at ultra-high redshift - parameter estimation with pulsar timing array data — •Woo-Seok Yim and Jürgen Schaffner-Bielich — Institut für Theoretische Physik, Goethe University, Frankfurt am Main, Germany
The origin of the nanohertz stochastic gravitational-wave background (SGWB) reported in 2023 remains under active discussion, with supermassive black hole binaries (SMBHBs) still being the leading astrophysical explanation. However, a discrepancy between the predicted SMBH abundance and the measured SGWB amplitude remains. This could be explained by a sub-dominant group of merging exotic compact objects (ECO), which are compact objects formed from dark matter at ultra-high redshift. We find and present combinations of binary parameters of such ECOs, namely the binary mass and merger redshift, that could significantly contribute to the total gravitational-wave energy density spectrum Ωgw at nanohertz scales.
This project is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundattion) through the CRC-TR211 "Strong-interaction matter under extreme conditions" under the project number 315477589 - TR 211.
Keywords: Gravitational Waves; Pulsar Timing Array; Dark Matter