My research focuses on gravitational-wave astrophysics and cosmology, with the goal of using gravitational waves from compact binaries to probe the nature of the dark universe and test cosmological models.

In gravitational-wave astrophysics, I study how gravitational waves can be used to probe the distribution and properties of dark matter around black holes. The strong gravitational field in the vicinity of a black hole can lead to the formation of dense dark-matter structures, such as dark-matter spikes or other compact dark environments. These structures can modify the orbital evolution of compact binaries and leave characteristic imprints on the gravitational-wave signal during inspiral. Such signatures may provide a new observational window into the nature and distribution of dark matter with future gravitational-wave detectors.

In gravitational-wave cosmology, I develop the framework of cosmological standard timers, in which primordial black-hole binaries can serve as a standard timer that encode the cosmic time–redshift relation. By measuring their gravitational-wave signals, this framework can be used to constrain the expansion history of the Universe and test cosmological models.

I also investigate void cosmology as a possible framework for addressing cosmological tensions, including the Hubble tension and the cosmic dipole tension. Gravitational-wave observations provide an independent way to test such scenarios, making void cosmology particularly relevant in the era of precision gravitational-wave cosmology.

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  279-1332

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  qianhang.ding@apctp.org

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  523

  523

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  Astrophysics/ Cosmology

  Astrophysics/ Cosmology