Cosmology 2025 @ Elba Island

Session

Morning session 5

12 Sept 2025, 09:10

Hermitage Hotel, Isola D'Elba

206. Explaining the H0 Tension via the Local Hole and CMB Lensing

Tom Shanks (Durham University, UK)

12/09/2025, 09:10

The current Cosmological Model and its Tensions (Theory and observations)

Poster

Observational evidence for a large local galaxy underdensity goes back to the 1990’s and, like the "Hubble tension", remains unexplained by standard 𝜦CDM. Wong et al (2022) show that this “Local Hole” covers >90% of the sky out to ~200Mpc with an ~20-30% underdensity, consistent with previous observations (e.g. Keenan, Barger and Cowie, 2014). We have speculated that this underdensity could...

214. The Host Masses of Active Galactic Nuclei before Cosmic Noon with TNG-Cluster and other cosmological Simulations of Galaxies

Akanksha Kapahtia (Max Planck Institute for Astronomy Heidelberg)

12/09/2025, 09:50

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

Talk

We investigate the host dark matter halo masses of AGNs across various cosmological simulations of galaxies (Illustris, IllustrisTNG, TNG-Cluster, Simba and EAGLEs). In particular we examine the co-evolution of the luminosity of AGNs in relation to the mass of their host dark matter halo from z=7 to z=3. Despite differences in AGN feedback implementations and SMBH seeding prescriptions across...

210. Data-driven galaxy-AGN co-evolution studies with eROSITA, Euclid and LSST

Johannes Buchner (Max Planck for extraterrestrial Physics)

12/09/2025, 11:00

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

Talk

Galaxy evolution follows the tapestry set by cosmology, but is modulated by central supermassive black holes. Human lifetimes limit the study of the stochastic gas motion from halos to the event horizon. Nevertheless, the last few decades have revealed a probabilistic multidimensional link between AGN outflows, black hole mass, accretion, galaxy mass, star-formation, morphology, and...

212. Processing of gas in galaxies within the cosmic web.

Gianluca Castignani (INAF OAS Bologna)

12/09/2025, 11:40

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

Talk

Galaxies are distributed in a complex filamentary network of matter called the cosmic web. It remains debated which is the overall impact of the cosmic web in processing cold gas of galaxies, as they move through large-scale filaments around the clusters down to the densest regions of the cluster cores. I will present the results of a large observational campaign, mainly exploiting IRAM...

215. Stellar Tracers of the Local Dark Matter Velocity Distribution Over a Range of Galaxy Simulations

Xiuyuan Zhang

12/09/2025, 12:20

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

Talk

Dark matter (DM) remains one of the central unresolved questions in modern physics. The majority of terrestrial direct detection experiments for DM rely on the assumption that the local DM velocity distribution conforms to the Standard Halo Model (SHM). However, perturbations arising from merger events can induce deviations from the SHM. Previous studies have suggested that the local stellar...