The 3rd Shanghai Assembly on Cosmology and Structure Formation

Session

Structure 2

Nov 18, 2025, 2:00 PM

Tianwen Hall

Conveners

Structure 2

• Jiaxin Han (Shanghai Jiao Tong University)

79. Filaments: from the large-scale structure to the CGM

Daniela Galárraga-Espinosa (Kavli-IPMU)

11/18/25, 2:00 PM

Structure Formation

Talk

I will present a characterisation of filamentary structures at different scales, from the large-scale cosmic filaments forming the skeleton of the cosmic web, to the smaller-scale filaments playing a crucial role in the circum-galactic medium (CGM). Using the outputs of recent large-scale hydro-dynamical simulations, I will focus on some fundamental properties of filaments at z=0, and show how...

28. A model for filament growth: accreting shells with angular momentum

Qi Guo (Kavli IPMU)

11/18/25, 2:30 PM

Structure Formation

Talk

As a component of the cosmic web, filaments are important for us to understand the formation of the large scale structure.
In this work, we study the influence of angular momentum, filament growth history, and cosmic expansion on filament density profiles.
We present two models characterizing dark matter filament growth implementing the stretch of filaments, the power law growth model (the...

47. The Spin of Cosmic Filaments: From Dark Matter to Baryons

Xichang Ouyang (Sun Yat-sen University)

11/18/25, 2:45 PM

Structure Formation

Talk

As a key component of the Universe’s large-scale structure, the kinematics of cosmic filaments has long been debated. Classical theory holds that filaments exhibit multipolar flows without a net, coherent rotation. However, two independent studies in 2021—one simulation-based and one observational—reported detections of filament rotation, sparking broad discussion in the community.
(1) Using...

9. The dark matter content of Milky Way dwarf spheroidal galaxies: Draco, Sextans and Ursa Minor

Hao Yang (Shanghai Jiao Tong University)

11/18/25, 3:00 PM

Galaxy Formation and Evolution

Talk

The Milky Way Survey of the Dark Energy Spectroscopic Instrument (DESI) has so far observed three classical dwarf spheroidal galaxies (dSphs): Draco, Sextans and Ursa Minor. Based on the observed line-of-sight velocities and metallicities of their member stars, we apply the axisymmetric Jeans Anisotropic Multi-Gaussian Expansion modeling (JAM) approach to recover their inner dark matter...

54. The Characteristic Mass and Energy Conversion Efficiency in the Cusp–Core Transition of Dark Matter Halos

Michi Shinozaki (University of Tsukuba)

11/18/25, 3:15 PM

Galaxy Formation and Evolution

Talk

We present an analytical model that embeds the cusp–core transition into the c–M relation of dark matter halos. The model accounts for deviations from scaling relations in galaxies, where central surface densities fall below c–M predictions. In contrast, UFDs retain high central densities consistent with CDM. Assuming supernova (SN) feedback drives the transition, the model predicts it...