Researchers propose a novel method using gravitational waves from black hole mergers to investigate the existence of dark matter. The study introduces an improved model for understanding how dark matter interacts with gravitational waves and provides a relativistic framework for predicting these waves.
Illustration of supermassive binary black hole binary systems at the cores of galaxies and the GWs they produce. Credit: NANOGrav/Olena Shmahalo in 2015 confirmed a prediction made by Einstein's Theory of General Relativity and led to a revolution in astronomy.
These waves are produced when massive, compact objects merge, creating ripples in spacetime that can be detected millions of light-years away. A decade later, researchers from the University of Amsterdam have proposed how GWs could be used to investigate an enduring cosmological mystery - the existence of Dark Matter.introduces an improved way to model how Dark Matter is affected by GWs caused by black hole mergers. By analyzing GWs with next-generation instruments, scientists will be able to discern the presence of this mysterious mass, assuming that it exists.. As they describe, their work focused on how black hole binaries or other compact objects co-orbit with each other and spiral inward to become much more massive black holes - known as Extreme Mass-Ratio Inspirals . *Illustration of supermassive binary black hole binary systems at the cores of galaxies and the GWs they produce. Credit: NANOGrav/Olena Shmahalo* This research is part of a long-term effort to predict what astronomers should expect from GWs and how to extract as much information as possible from them. In the past, studies have typically relied on simplified descriptions of how a black hole's environment affects EMRIs. In contrast, the new paper encompasses a broad range of environments using General Relativity rather than Newtonian gravity to describe how a black hole's environment affects an EMRI's orbit and the resulting GWs. In essence, this new study provides the first fully relativistic framework for predicting GWs caused by black hole mergers. In particular, the study focuses on dense concentrations of Dark Matter that may form around massive black holes. By combining their relativistic description with state-of-the-art models, the team showed how DM"spikes" or"mounds" would leave a discernible imprint on GW signals. About a decade from now, the European Space Agency plans to launch the, the first space-based observatory dedicated to studying GWs. Consisting of three spacecraft using six lasers to measure ripples in spacetime, this observatory is expected to detect over 10,000 GW signals on the course of its mission. This work not only offers hints about what scientists will find thanks to LISA and other detectors, such as the, and the Kamioka Gravitational-wave Detector . It is also part of a growing field of research that proposes using GWs to map the distribution of DM throughout the Universe, which accounts for 65% of its mass. It is also expected to shed light on the nature of this mass and its composition.Matt Williams is a space journalist, science communicator, and author with several published titles and studies. His work is featured in
Gravitational Waves Dark Matter Black Holes General Relativity Cosmology
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