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SUMMARY:Astrophysical Signatures of Self-Interacting Dark Matter: From Dar
 k Substructures to Galaxy Clusters
DTSTART;VALUE=DATE-TIME:20260305T030000Z
DTEND;VALUE=DATE-TIME:20260305T040000Z
DTSTAMP;VALUE=DATE-TIME:20260512T072300Z
UID:indico-event-4797@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Daneng Yang (杨大能) (Purple Mountain Observatory
 \, CAS)\n\nAbstract:Small-scale structures across a wide range of scales p
 rovide a valuable probe of dark matter microphysics. Self-interacting dark
  matter (SIDM) modifies halo structure through gravothermal evolution\, wh
 ose outcome depends on the effective scattering strength at the system's c
 haracteristic velocity. Depending on this scale\, halos can develop extend
 ed cores or undergo core contraction\, linking observational signatures ra
 nging from dark substructures to galaxy clusters within a dynamical framew
 ork. In the presence of two SIDM components\, collisional relaxation induc
 es mass segregation\, redistributing the species and increasing central ha
 lo densities. Our recent work shows that this mechanism can reconcile dwar
 f-scale cores with cluster constraints while significantly boosting galaxy
 –galaxy strong lensing efficiencies relative to cold dark matter and one
 -component SIDM. On smaller scales\, strong lensing also probes non-lumino
 us substructures through the analysis of lensing image perturbations and f
 lux ratio anomalies. Recent studies have revealed the presence of compact\
 , dense dark objects that are analogous to core-collapsed SIDM halos. To b
 ridge theory and observation\, we have developed an analytic model for len
 sing by SIDM halos that captures the full range of gravothermal phases and
  reproduces simulation results at percent-level accuracy. Our recent works
  have extended the modeling to incorporate the effects of baryons and mass
  segregation.Biography:Daneng Yang received his Ph.D. and bachelor’s deg
 ree from Peking University. He previously conducted postdoctoral research 
 at Tsinghua University and the University of California\, Riverside. He is
  currently an Associate Research Professor at Purple Mountain Observatory.
  In recent years\, his research has focused on the distribution of dark ma
 tter in the universe and its associated new-physics signatures. His work a
 lso broadly covers structure formation\, galaxy formation\, dark matter de
 tection\, and gauge boson production at colliders.Alternative online link
 ：https://meeting.tencent.com/dm/2sQPmJRNuHj1ID: 477307055\n\nhttps://ind
 ico-tdli.sjtu.edu.cn/event/4797/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/4797/
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