IBS Conference on Dark World

27 Oct 2025, 09:00 → 30 Oct 2025, 20:00 Asia/Seoul

IBS HQ (IBS Science and Culture Center)

Overview

The IBS Conference on Dark World is a biennial meeting jointly organized by the four IBS centers on fundamental physics: Dark Matter Axion Group (DMAG), Center for Theoretical Physics of the Universe - Particle Theory and Cosmology Group (CTPU-PTC), Center for Theoretical Physics of the Universe - Cosmology, Gravity and Astroparticle Physics Group (CTPU-CGA), and Center for Underground Physics (CUP).  The conference will cover various topics, including dark matter, dark force, and related subjects in physics beyond the standard model of particle physics.  The aim of this meeting is to bring together theorists, experimentalists, and observers working in the field of cosmology, astrophysics, and particle physics to discuss the latest results, ideas, and future prospects on the physics of the dark world

Program    

• Finalized program available: [Timetable] 

Registration

• Please complete your registration:  [Registration] 
• Online registration deadline: October 23 (Thu), 4:00 PM (KST).
• On-site registration: Available, however, availability of lunch coupons, reception, and banquet is limited and not guaranteed.      

Organizers

• Sanghyeon Chang (IBS CTPU-PTC)
• Tae Hyun Jung (IBS CTPU-PTC)
• Kiwoon Choi (IBS CTPU-PTC)
• Eunju Jeon (IBS CUP)
• Yeongduk Kim (IBS CUP)
• SungWoo Youn (IBS DMAG)
• Dong-Won Jung  (IBS CTPU-CGA)
• Yamaguchi Masahide (IBS CTPU-CGA)     

Contacts  

• ibs.conference@cpmg.co.kr     

Poster  

Hosted & organized by

 

2025 IBS Dark World_Poster.jpg

Hotel to IBS_Dark World.pdf

ibs_conf_dark world_poster2.jpg

Monday, 27 October

10:00 → 11:00 Registration

11:00 → 12:30 Session 1

Convener: Dong-Won Jung (IBS CTPU-CGA)

11:00 Welcom Remarks

Speaker: SungWoo Youn (IBS-DMAG)

11:10 Cosmological Quasiparticles and the Cosmological Collider

Speaker: Seung Joon Lee (KIAS)

S1-01. Cosmological_Quasiparticles_IBS_SJLee.pdf

11:50 Gravitational Waves for New Physics (Zoom Presentation)

Speaker: Yue Zhao (HKUST)

S1-02.DPDM - GeV - mid_Yue Zhao.pdf

12:30 → 14:30 Lunch

14:30 → 15:50 Session 2

Convener: Saebyeok Ahn (IBS/DMAG)

14:30 Status of the ADMX Axion Dark Matter Search

Speaker: Gray Rybka (University of Washington)

S2-01.DW_2025_Gray Rybka.pdf

15:10 Recent Result from NaI(Tl)-based WIMP Search in COSINE-100 and Status of the Upgrade

Speaker: Gyunho Yu (IBS CUP)

S2-02. COSINE_DarkWorld_Gyunho Yu.pdf

15:50 → 16:20 Coffee Break

16:20 → 17:40 Session 3

Convener: Sang Hui Im (Center for Theoretical Physics of the Universe, Institute for Basic Science, Korea)

16:20 String Bundles in Multi-Axion Models and the QCD Axion Domain-Wall Problem

Speaker: Fuminobu Takahashi (Tohoku University)

S3-01.Takahashi.pdf

17:00 Searching for Axion Dark Matter at IBS-DMAG

Speaker: Saebyeok Ahn (IBS DMAG)

ibs_dark_world_2025_saebyeok_v3.pptx

18:00 → 20:00 Reception

Tuesday, 28 October

10:00 → 11:20 Session 1

Convener: Yoomin Oh (Center for Underground Physics, Institute for Basic Science)

10:00 Recent results from Super-Kamiokande

Speaker: Yasuo Takeuchi (Kobe University)

S1-01.DarkWorld2025-takeuchi_for_web-20251028.pdf

10:40 CLOUD: Resolving the reactor puzzle(s) at Chooz?

Speaker: Anatael Cabrera (CNRS)

S1-02. CLOUD@IBS-DarkWorld-Oct2025_1028_Anatael.pdf

11:20 → 11:50 Coffee Break

11:50 → 12:30 Session 2

Convener: Yoomin Oh (Center for Underground Physics, Institute for Basic Science)

11:50 Searching for Light Dark Matter - Boosted Dark Matter

In the absence of a confirmed dark-matter signal in traditional dark-matter search experiments, advances in theory and experiment have opened various new possibilities of searching for dark-matter particles even lighter than GeV, e.g. boosted dark matter, direct detection with novel materials and sensors, and beam dump experiments. In this talk, I will focus on recent advancements in energetic dark-matter searches. First, I will provide a short summary of various boosting mechanisms of dark-matter particles and explain their direct searches with some potential issues. Next, I will discuss new search channels of boosted dark matter. I will also very briefly mention the importance of cosmological side studies of boosted dark matter.

Speaker: Jong-Chul Park (CNU)

S1-03.BDM_IBS-DW2025_JCPark.pdf

12:30 → 14:30 Lunch

14:30 → 15:50 Session 3

Convener: SeungCheon Kim (CUP, IBS)

14:30 Multi-component dark matter from Minimal Flavor Violation

Speaker: Shohei Okawa (APCTP)

S2-01.DarkWorld2025_Okawa.pdf

15:10 VHE Gamma-Ray Astrophysics Overview & Future – HAWC & SWGO

Speaker: Chang Dong Rho (Sungkyunkwan University)

15:50 → 16:20 Coffee Break

16:20 → 17:40 Session 4

Convener: Jai-chan Hwang (IBS CTPU-PTC)

16:20 Understanding Galactic Dark Matter with Neural Networks

Recent advances in machine learning (ML), particularly neural density estimation like normalizing flows, diffusion models, and flow matching, have opened new doors for high-precision, model-independent density estimation. These techniques are highly valuable for galactic dynamics studies, as they allow us to estimate the distribution of stars in phase space (position and velocity) without relying on traditional simplified models. By combining these ML-based stellar density estimates and equations of motion solvers for inferring gravitational fields, we can measure the local dark matter density in a model-independent way. This talk presents new research opportunities in this direction, focusing on modeling objects in our local universe using neural networks and using them for understanding local galactic dark matter distribution. We anticipate that these modern machine learning-based approaches will allow us to fully utilize the potential of current and future astronomical catalogs, significantly improving our understanding of dark matter in the local universe.

Speaker: Sung Hak Lim (IBS CTPU-PTC)

17:00 Axion mass prediction from cosmic string network

Speaker: Minho Son (KAIST)

S3-02. DarkWorld2025_IBS_Minho Son.pdf

Wednesday, 29 October

10:00 → 11:20 Session 1

Convener: Mohammad Ali Gorji (IBS CTPU-CGA)

10:00 Looking through loops: CMB birefringence from axion strings

Speaker: Andrew J Long (Rice University)

S01.1.Andrew_Long-Dark_World_2025.pdf

10:40 Dark matter around binary black hole mergers

Speaker: Josu Aurrekoetxea (MIT)

11:20 → 11:50 Photo Session & Coffee Break

11:50 → 12:30 Session 2

Convener: Mohammad Ali Gorji (IBS CTPU-CGA)

11:50 Status and Prospects of the PandaX experiment

Speaker: Tao Li (Shanghai Jiao Tong University)

S01-03. Status and Prospect of PandaX experiment_v3_Tao Li.pdf

12:30 → 14:30 Lunch

14:30 → 15:50 Session 3

Convener: Seokhoon Yun (IBS CTPU-PTC)

14:30 Echoes of Self-Interacting Dark Matter from Binary Black Hole Mergers

Speaker: Jeong Han Kim (Chungbuk National University)

S02.1.IBS_Dark_2025_Jeong Han Kim.pdf

15:10 Primordial magnetic fields during the electroweak crossover and baryogenesis from magnetic helicity decay

Magnetic fields are ubiquitous in the present universe. Their existence has been discussed as a relic from the early universe, which may be a consequence of some physics beyond the Standard Model. In particular, if primordial magnetic fields were generated at high temperatures, the electroweak symmetry breaking implies a transition from the hyper- (U(1)Y) magnetic field in the high-temperature phase to the ordinary (U(1)em) magnetic field in the low-temperature phase. However, this transition process has been understood only naively. We examine the electroweak symmetry breaking from the viewpoint of symmetry-breaking pattern, and characterize the evolution of magnetic fields across the crossover in a gauge-invariant manner. In particular, we point out that the baryogenesis scenario based on primordial magnetic fields suffers from both quantitative and qualitative uncertainties. This makes the previously-proposed cosmological constraints on primordial magnetic fields, which concern two baryon asymmetry problems, less robust. Consequently, the co-genesis scenario for the intergalactic magnetic fields and the baryon asymmetry of the universe may revive

Speaker: Fumio Uchida (IBS CTPU-CGA)

S02.2.IBS_Uchida.pdf

15:50 → 16:20 Coffee Break

16:20 → 17:40 Session 4

Convener: SungWoo Youn (Institute for Basic Science / Dark Matter Axion Group)

16:20 A waveguide-based resonant-phase-matching Josephson traveling-wave parametric amplifier with efficient phase correction

Speaker: Chung Wai Sandbo Chang (RIKEN)

S03.1.slide_IBS_v1_C.W.Sandbo Chang.pdf

17:00 Search for DM annual modulation with NaI-based detectors

Speaker: Aldo Ianni (INFN)

S9-02. DarkWorld-Ianni 발표슬라이드.pdf

18:00 → 20:00 Banquet

Thursday, 30 October

09:30 → 10:50 Session 1

Convener: Eunju Jeon (CUP, IBS)

09:30 Axionic Extensions of the Standard Model

Speaker: Kwang Sik Jeong (Pusan National University)

DarkWorld-KSJ.pdf

10:10 Neutrino experiment at Yemilab

Speaker: Eunil Won (Korea University)

S01-02. Yemilab_DW_Eunil Won.pdf

10:50 → 11:20 Coffee Break

11:20 → 12:40 Session 2

Convener: Sebastian Bahamonde (IBS CTPU-CGA)

11:20 Superheavy Kaluza-Klein particle production in the early universe

Extra dimensions appear in the theory beyond the standard model, such as superstring theory. Kaluza-Klein modes associated with the compact extra spaces are usually never excited in the low energy effective theory below the compactification scale, and we are able to use the 4D effective theory by integrating them out. However, it might not be the case. In case that gauge fields along the compact spaces acquire time-dependent field values, which may occur in the very early universe, the time-dependence of the gauge field leads to "electric fields" along compact spaces. KK momenta can be accelerated/decelerated by the electric fields, and when KK momenta vanish, the "KK modes" are produced from vacuum in the exactly the same way as Schwinger effect in strong field QED. I will show that the KK particles are indeed produced with concrete models of 5D QED with gravity. Remarkably, KK particles are produced even if the Hubble scale is hierarchically smaller than the compactification scale. I also briefly discuss the possibility that the produced KK particles become super heavy dark matter.

Speaker: Yusuke Yamada (IBS CTPU-CGA)

S02-01. dark world-yamada.pptx

12:00 RES-NOVA at the interface of the Dark World

Speaker: Luca Pattavina (INFN)

S02-02. res-nova_LP_DW2025.pdf

12:40 → 14:40 Lunch