Cosmology 2025 @ Elba Island

Session

Morning session 4

Sep 11, 2025, 9:10 AM

Hermitage Hotel, Isola D'Elba

200. DArk Matter Particle Explorer: 9 years in Space

Andrii Tykhonov (Universite de Geneve (CH))

9/11/25, 9:10 AM

Talk

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...

226. Learning about the early Universe with the cosmic 21-cm signal

Andrei Mesinger

9/11/25, 9:50 AM

The Evolving Universe (Reionization, first galaxies and their SMBH, Quasars and AGN, the assembly of cosmological structures)

Talk

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...

192. Implications for Cosmic Birefringence from Recent Cosmological Observations

Toshiya Namikawa

9/11/25, 11:00 AM

Probes of the Universe from measurements - CMB, LSS, and BH of any mass

Talk

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...

181. Evolution of Mass and Structure in Dark Matter Halos: Scaling Laws from Dwarfs to Galaxy Clusters

Masao Mori (University of Tsukuba)

9/11/25, 11:40 AM

Dark Matter (Its nature: Theory, Observations, Detection, Production at accelerators)

Talk

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...

213. Mapping Gravity with Extragalactic Streams and Citizen Science

Nathaniel Starkman (MIT Kavli Institute for Astrophysics and Space Research)

9/11/25, 12:20 PM

Dark Matter (Its nature: Theory, Observations, Detection, Production at accelerators)

Talk

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...