The 3rd Shanghai Assembly on Cosmology and Structure Formation

Session

Structure 1

Nov 17, 2025, 4:10 PM

Tianwen Hall

Conveners

Structure 1

• Benjamin Joachimi (University College London)

57. Lensing signatures of self-interacting dark matter halos: an analytic approach

Daneng Yang (Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, China)

11/17/25, 4:10 PM

Structure Formation

Talk

We present an analytic model for gravitational lensing by self-interacting dark matter (SIDM) halos. The model captures the full range of gravothermal evolution and accommodates inner logarithmic density slopes from 0 to –2.5, enabling the construction of complex halo profiles by superimposing components at different evolutionary stages. As an application, we model galaxy–galaxy strong lensing...

15. The AIDA-TNG project: new insights on alternative dark matter in simulations of galaxy formation

Giulia Despali (University of Bologna)

11/17/25, 4:30 PM

Structure Formation

Talk

One of the foundations of the concordance cosmological model is that approximately 85 per cent of the matter content of the Universe is in the form of some yet unknown component that we can detect only through its gravitational effect: dark matter. While the standard Cold Dark Matter model is very successful at explaining the large scale structure distribution of the universe, it has been...

17. The clustering of dark matter halos in alternative cosmological models

Massimiliano Romanello (Università di Bologna)

11/17/25, 4:50 PM

Structure Formation

Talk

The clustering of large-scale structures is recognised as a fundamental cosmological probe, offering us the possibility to constrain fundamental parameters such as the matter density content of the Universe. Currently, the most acknowledged cosmological scenario is the ΛCDM model, which assumes that dark matter particles exist in a ‘cold' version, namely in the form of very massive candidates,...

34. The Hydrogen distribution inside and around haloes in AIDA-TNG simulations

Chi Zhang (Purple Mountain Observatory)

11/17/25, 5:05 PM

Structure Formation

Talk

We present, for the first time, the gas and HI distributions in and around haloes in the TNG universe for three alternative dark-matter models: SIDM, velocity-dependent SIDM, and WDM. We show how these models affect HI and the resulting Lyman-$\alpha$ spectra. We show how gas and HI density profiles change with halo mass and redshift with alternative DM. Finally, we compute the...