The Dark Matter Particle Explorer (DAMPE) is a pioneering calorimetric space experiment that has been successfully operating since December 2015. Its primary scientific objectives include measuring the spectra of both primary and secondary cosmic-ray species, searching for potential indirect signatures of dark matter in cosmic rays, and gamma-ray physics. For electrons and gamma rays, DAMPE...
The 21-cm hyperfine line of HI is set to revolutionize studies of the first billion years, spanning the cosmic dawn of the first stars and eventual reionization of our Universe. I will discuss the potential of this probe in learning about the unknown astrophysics of the first galaxies as well as physical cosmology. Preliminary claims of a detection of the mean (sky-averaged) 21cm signal...
In this talk, I present implications for the cosmic birefringence from recent cosmological observables. We begin by showing constraints on cosmic birefringence induced by ALPs using the Planck $EB$ power spectrum. We find that cosmic birefringence signal is consistent with a constant rotation model and some specific ALP masses are excluded. Next, we show that cosmic birefringence can explain a...
We investigate the mass evolution of dark matter subhalos in Milky Way–like galaxies using ultra-high-resolution N-body simulations (Kazuno et al. 2024). Subhalos undergo early accretion followed by tidal stripping, losing over 80% of their mass by z = 1. Their orbits closely resemble those of Milky Way satellites, as revealed by Gaia EDR3, reinforcing the CDM paradigm. In contrast, Kaneda et...
Wide-field surveys like Euclid mark a new era of extragalactic stellar stream studies, with exciting applications in measuring baryon and dark matter distributions, and connecting galaxies to their cosmological context.
I present results from a pilot study combining Euclid imaging with Zooniverse classifications to detect and analyze streams. We use projected stream morphologies to constrain...
