Conveners
Parallel-1
- Yun-Long Zhang (NAOC(National Astronomical Observatories, CAS))
Analyses by the Dark Energy Spectroscopic Instrument (DESI) collaboration suggest a significant deviation from the ΛCDM model when their baryon acoustic oscillation (BAO) measurements are combined with Planck cosmic microwave background (CMB) data and various Type Ia supernova (SNIa) samples. In this work, we systematically investigate the origin of the deviations from the ΛCDM reported in...
The tensions between cosmological parameter measurements from the early-universe and the late-universe datasets offer an exciting opportunity to explore new physics, if not accounted for unknown systematics. Apart from the well-known Hubble tension, a tension up to ∼ 4.9σ in the cosmic dipole has also been reported. While the cosmic dipole is mainly induced by the observer’s kinetic motion, an...
We demonstrate that black hole superradiance provides a powerful probe of interacting dark energy models. We investigate two scenarios: one where the dark energy acts as a mediator of ultralight dark matter self-interactions, and another where the dark energy field itself becomes superradiant due to a density-dependent mass enhancement within a dark matter spike surrounding a supermassive...
In this work, we study the gravitational backreaction (i.e., the“self-force”) of a point mass moving around a nonrotating, compact star on a circular orbit. We find that the additional self-force, comparing with the case with a point mass orbiting around a Schwarzschild black hole, can be well characterized by a universal frequency-dependent function multiplied by the (dynamical) tidal...
