Cosmology 2025 @ Elba Island

Session

Morning Session 2

9 Sept 2025, 09:00

Hermitage Hotel, Isola D'Elba

205. Formation of Nuclear Star Clusters and Supermassive Black Holes via First-Generation Globular Cluster Disruption.

Peter Berczik (Main Astronomical Observatory, National Academy of Sciences of Ukraine)

09/09/2025, 09:10

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

Talk

The Nuclear Star Cluster (NSC) resides at the center of the Milky Way galaxy and represents an extremely dense stellar system. Most such systems are also known to harbor Supermassive Black Holes (SMBHs).

Several mechanisms have been proposed to explain the formation of NSC+SMBH structures, with two prevailing scenarios:

(i) the inward migration of gas toward the galactic center, followed...

241. Searches for dark matter using LHC Run-2 and Run-3 data recorded by the ATLAS experiment

Alvaro Lopez Solis (The Barcelona Institute of Science and Technology (BIST) (ES))

09/09/2025, 09:50

Dark matter constitutes about 85% of the matter content of the Universe, yet its microscopic nature remains unknown. While astrophysical and cosmological observations provide compelling evidence for its existence, they do not reveal how it interacts with Standard Model particles beyond gravity. Collider experiments such as the LHC provide a complementary avenue of investigation by directly...

216. Dark matter searches in dwarf irregular galaxies with gamma-ray observatories.

Viviana Gammaldi (San Pablo CEU, Madrid, Spain.)

09/09/2025, 11:00

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

Talk

I will review the state-of-the-art of dark matter (DM) searches in dwarf irregular galaxies (dIrrs). DIrrs have been proposed as new astrophysical targets of interest for DM searches in gamma rays, complementary to dwarf spheroidal galaxies, galaxy clusters and the Galactic center. DIrrs show high DM content (with respect to the luminous matter), relatively close distance and low gamma-ray...

231. Scaling Relations between the Luminous and Dark Matter Density Parameters of Milky Way Dwarf Spheroidal Galaxies

Casey Watson (Millikin University)

09/09/2025, 11:40

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

Talk

We use surface brightness and velocity dispersion data to constrain the parameters of the luminous and dark matter densities for a sample of 10 Milky Way, dwarf spheroidal galaxies (MW dSphs). We model the luminous matter density with a generalized Plummer profile, of inner slope $\gamma_*$, and the dark matter (DM) density with a Zhao-type model, of inner slope $\gamma$. The specific DM...

223. Cosmology with Ultralight Dark Matter

Kimberly Boddy (University of Texas at Austin)

09/09/2025, 12:20

Fundamental aspects of Cosmology.

Talk

The presence of ultralight dark matter in the early Universe suppresses small-scale structure formation. Moreover, if it couples to the Standard Model, it can induce a variation of fundamental constants. In this talk, I will discuss the cosmological impact of an ultralight dark matter field with an effective quadratic coupling to the Standard Model, such that the fine structure constant and...