# Event Details

- **Event Name**: Seminar by Dr. Qianhang DING (Institute for Basic Science)
- **Event Start and End Date**: Thu, 20 Nov, 2025 at 01:30 pm – Thu, 20 Nov, 2025 at 02:15 pm
- **Event Description**: Ultralight bosons (ULBs) can form macroscopic superradiant clouds around spinning black holes. For scalar ULB mass μ ∼ 10−21 eV, its cloud-induced dynamical friction significantly impacts supermassive black hole (SMBH) binary dynamics. Considering orbital-decay power of the century-monitored OJ287 system, we place novel bounds restricting ULB mass range μ ≃ (8.5−22) ×10−22 eV independent of any dark matter assumptions and show ULB drag can also efficiently reconcile any future confirmations of the debated orbital decay excess. Meanwhile, we show that for scalar ULB masses μ ∼ 10−22 − 10−21 eV, boson cloud dynamical friction drives SMBH final-parsec evolution in ≲ 1 Gyr and suppresses the nanohertz gravitational wave background with turnover. Forthcoming pulsar timing array data and precise SMBH orbital timings will decisively test this scenario.
- **Event URL**: https://allevents.in/hong-kong/seminar-by-dr-qianhang-ding-institute-for-basic-science/200029218256424
- **Event Categories**: workshops
- **Interested Audience**: 
  - total_interested_count: 1

## Ticket Details

- **Ticket URL**: http://facebook.com/200029218256424?utm_source=AllEvents.in&utm_medium=event-discovery-platform&utm_campaign=hong+kong-events

## Event venue details

- **city**: Hong Kong
- **state**: HK
- **country**: Hong Kong
- **location**: Rm G25, Science Centre North Block, The Chinese University of Hong Kong
- **lat**: 22.29912
- **long**: 114.17223
- **full address**: Rm G25, Science Centre North Block, The Chinese University of Hong Kong, 90 Nathan Rd, Tsim Sha Tsui, Kowloon, Hong Kong SAR, Hong Kong, Hong Kong

## Event Organizer details

- **affiliate_id**: 2
- **organizer**: Department of Physics, CUHK 香港中文大學物理系 (https://allevents.in/org/department-of-physics-cuhk-香港中文大學物理系/23736720)

## Event gallery

- **Alt text**: banner
  - **Image URL**: https://cdn-az.allevents.in/events2/banners/81cf83ef1f7ff841c5ef0c1c0df76c2b256384c46c3656df54c3040d4bb40434-rimg-w1200-h1696-dcffffff-gmir?v=1763519362
- **Alt text**: thumbnail
  - **Image URL**: https://cdn-az.allevents.in/events2/banners/686fccdea955d61409120e4ee6cb2434fe8b7b8ec716e03fbc0c766a2a99e6ff-rimg-w300-h300-dcffffff-gmir?v=1763519364

## FAQs

- **Q**: When is the event happening?
  - **A:** Thu, 20 Nov, 2025 at 01:30 pm
- **Q**: Where is the event happening?
  - **A:** Rm G25, Science Centre North Block, The Chinese University of Hong Kong, 90 Nathan Rd, Tsim Sha Tsui, Kowloon, Hong Kong SAR, Hong Kong, Hong Kong
- **Q**: Who is organizing the event?
  - **A:** Department of Physics, CUHK 香港中文大學物理系
- **Q**: What type of event is this?
  - **A:** workshops
- **Q**: Where can I find ticket details about Seminar by Dr. Qianhang DING (Institute for Basic Science) ?
  - **A:** You can find ticket details about this event on AllEvents.

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