TAsP Meeting 2026

Session

Morning 2

29 Jan 2026, 09:30

9. Multiwavelength probes of dark matter

Marco Taoso (Istituto Nazionale di Fisica Nucleare)

29/01/2026, 09:30

33. The Galactic Centre Excess via leptophilic dark matter in U(1)Li-Lj models

Jordan Koechler (Istituto Nazionale di Fisica Nucleare)

29/01/2026, 10:00

The particle nature of dark matter remains one of the most important open questions in physics. An intriguing clue is the γ-ray excess observed by Fermi-LAT toward the Galactic Center, whose spectrum resembles the expected signal from annihilating weakly interacting massive particles. However, many conventional dark matter models are now strongly constrained by direct detection and collider...

37. Searching for ALP DM decay across the electromagnetic spectrum

Jorge Terol Calvo (Istituto Nazionale di Fisica Nucleare)

29/01/2026, 10:12

In this talk I will review two different works that search for axion-like particles (ALPs) decay into two photons. Assuming dark matter (DM) to be in the form of ALPs, we study prospects to detect ALPs with the upcoming near-infrared telescope SPHEREx taking into account signals from the DM halos of dwarf spheroidal galaxies, the Large Magellanic Cloud and the Milky Way. In addition, we show...

40. Self-Consistency in Dark Matter Capture by Celestial Objects

Takuya Okawa (SISSA)

29/01/2026, 10:24

Dark matter capture by celestial objects is a powerful method to detect dark matter indirectly. We evaluate conditions on the dark matter annihilation cross section to achieve the commonly assumed situation, capture-annihilation equilibrium, and check its consistency with being thermal relic dark matter, unitarity bounds, and cosmological bounds. We also consider dark matter particles that...

54. Extragalactic non-thermal emission

Javier Israel Reynoso Cordova (Istituto Nazionale di Fisica Nucleare)

29/01/2026, 11:06

In this work, we use low-frequency radio maps to constrain the diffusion properties of cosmic-ray electrons in external galaxies, demonstrating that these data provide a powerful handle on the diffusion coefficient and its spatial and energy dependence. A central novelty of our previous studies is the implementation of fully realistic galactic geometries and proper line-of-sight integration,...

56. Addressing the Impact of Solar Modulation Systematic Uncertainties on Cosmic-Ray Propagation Models

Isabelle John (University of Turin & INFN Turin)

29/01/2026, 11:18

While remarkable progress has been made to understand the propagation of cosmic rays, a variety of astrophysical uncertainties persists. At energies below about 50 GeV, the cosmic-ray flux is significantly modulated by solar activity, a process that is not precisely understood. Using the recently published AMS-02 data for the time-dependent cosmic-ray fluxes, we study the effects of solar...

36. Wallions: Ultralight Dark Matter from the Boundaries of Field Space

Mathias Becker (University of Padova)

29/01/2026, 11:30

I will present a new framework for generating ultralight dark matter based on a scalar field that experiences boundaries in field space. Such boundaries give rise to wallions, excitations whose masses are exponentially suppressed yet radiatively stable. After introducing the basic setup, I will discuss how wallions behave in the early universe, how these boundaries can form dynamically, and...

57. Topological Portals to the Dark Sector

Nudzeim Selimovic (INFN Padova)

29/01/2026, 11:42

I will present the construction and phenomenology of novel portals between the Standard Model and dark sectors, arising from topological operators in chiral perturbation theory. The first example is based on a mixed Wess–Zumino–Witten term that uniquely connects three QCD pions to two dark pions, leading to a consistent framework for light thermal inelastic dark matter with suppressed direct...

52. Seasons of Dark Matter Freeze-In Shaped by the Weather of the Early Universe

Tommaso Sassi (INFN Sezione di Firenze, Università degli Studi di Firenze)

29/01/2026, 11:54

Quantifying the imprints of freeze-in dark matter (DM) on cosmological structures requires the knowledge of its phase-space momentum distribution. We investigate how different cosmological histories before nucleosynthesis, what we refer to as “weather” of that epoch, give rise to distinct “seasons” in the DM momentum distribution that govern its warmness. Studying decay-driven production...

63. Discussion

29/01/2026, 12:06