2 papers
astro-ph.CO2025
New constraints on cosmological gravitational waves from CMB and BAO in light of dynamical dark energy
Sai Wang, Zhi-Chao Zhao
In this work, we derive upper limits on the physical energy-density fraction today of cosmological gravitational waves, denoted by , via analyzing \emph{Planck}…
astro-ph.CO2025
Prospects for probing dark matter particles and primordial black holes with the Square Kilometre Array using the 21 cm power spectrum at cosmic dawn
Meng-Lin Zhao, Yue Shao, Sai Wang +1
Probing the nature of dark matter (DM) remains an outstanding problem in modern cosmology. The 21 cm signal, as a sensitive tracer of neutral hydrogen during cosmic dawn, provides…