BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Shadow of rotating black hole surrounded by dark matter
DTSTART;VALUE=DATE-TIME:20261024T073000Z
DTEND;VALUE=DATE-TIME:20261024T075000Z
DTSTAMP;VALUE=DATE-TIME:20261025T034525Z
UID:indico-contribution-3006@indico.itp.ac.cn
DESCRIPTION:Speakers: Haiyuan Feng (Shanxi Normal University)\nDark matter
  (DM)\, a fundamental cosmic component\, motivates the study of its influe
 nce on black hole (BH) shadows\, especially for spinning BHs confirmed by 
 EHT observations. This work generalizes the Schwarzschild BH surrounded by
  DM to an axisymmetric Kerr BH using the Newman–Janis Algorithm (NJA)\, 
 investigating the resulting event horizon and ergosphere structures. Emplo
 ying null geodesics\, we examine the effects of DM mass (\\Delta M) on BH 
 shadow\, including its radius\, distortion\, and the associated energy emi
 ssion rate. Our analysis reveals that DM has a negligible effect below a c
 ritical mass\, once this threshold is surpassed\, all BH structures expand
  significantly. Furthermore\, DM robustly contributes to the shadow mainta
 ining a near circular shape\, even for highly spinning BHs. This pronounce
 d structural expansion under high DM mass may potentially exceed current o
 bservational constraints\, suggesting that DM must either be absent in the
  immediate vicinity of the BH or its localized mass must remain below this
  critical value to be consistent with astrophysical observations.\n\nhttps
 ://indico.itp.ac.cn/event/427/contributions/3006/
LOCATION:
URL:https://indico.itp.ac.cn/event/427/contributions/3006/
END:VEVENT
END:VCALENDAR