2026 CAU-IBS Beyond the Standard Model Workshop

Session

Dark matter

7 Jun 2026, 14:00

Chung-Ang University

1. Probing low reheating temperature with dark age 21cm signal

Ki-Young Choi (Sungkyunkwan University (KR))

07/06/2026, 14:00

2. Scalar portal verifiable light dark matter and correlated gravitational wave signatures

Erdenebulgan Lkhagvadorj (Sungkyunkwan University (KR))

07/06/2026, 14:30

Light DM candidates, motivated by the absence of WIMP signals in direct detection experiments, can yield observable direct detection signals if they interact through light mediators with sizeable couplings. However, such interactions generally lead to an under-abundant relic density due to efficient annihilation into the light mediators. This tension can be naturally resolved if DM freezes out...

3. Primordial Black Hole Hotspots Beyond Flat Spacetime

Jong-Hyun Yoon (Chungnam National University)

07/06/2026, 14:45

Evaporating primordial black holes heat the surrounding plasma via Hawking radiation, forming localized hotspots whose temperature may far exceed that of the cosmological background. Previous studies of hotspot formation and cooling have treated the subsequent energy transport in flat spacetime, thereby neglecting the expansion of the Universe. We formulate the diffusion equation governing the...

47. B-Modes Beyond Inflation: Causal Tensor Sources in the Early Universe

Kylar Greene (University of New Mexico)

07/06/2026, 15:00

Primordial B-mode polarization is often viewed as a smoking-gun signature of inflationary gravitational waves. However, as experiments such as LiteBIRD, the Simons Observatory, and CMB-S4 push toward sensitivities near r ~ 0.001, non-inflationary tensor sources may become observationally relevant. In this talk, I will introduce early causal tensor sources (ECTs), including dark-sector...

4. Circumstellar Medium of Supernovae as New Probes for Feebly-Interacting Particles

Seokhoon Yun (Kyungpook National University)

07/06/2026, 15:45

5. Neutron Portal and Dark Matter-Baryon Coincidence: from UV Completion to Phenomenology

Sudhakantha Girmohanta

07/06/2026, 16:15

6. On the Low-Energy Behavior of Dynamical Gauge Couplings

Michael Shamma (Korea Institute for Advanced Study)

07/06/2026, 16:30

45. Peccei Quinn genesis

Jun-Ho Song (Chung-Ang University)

07/06/2026, 16:45

36. Revisiting Minimal Dark Matter Models

Koichi Hamaguchi (University of Tokyo)

11/06/2026, 09:30

We revisit several minimal extensions of the Standard Model for dark matter. Depending on time, we discuss some or all of the following: (i) a scalar dark matter with higher-dimensional operators, where thermal misalignment provides a viable production mechanism; (ii) sterile neutrino dark matter in the presence of lepton flavor asymmetries; (iii) Majorana fermion dark matter with a...

37. Direct detection of sub-eV dark matter with torsion balance experiments

Dr Shigeki Matsumoto (Kavli IPMU)

11/06/2026, 11:00

Dark matter with sub-eV masses has an extremely high number density in our Galaxy, and its scattering with macroscopic objects can be significantly enhanced by coherence effects. Repeated scatterings with a target object can then induce a measurable acceleration. Torsion balance experiments with geometrically asymmetric test masses are, in principle, sensitive to such a signal. We show that...

40. Invisible Higgs interaction at the muon collider

Dr Kyu Jung Bae (Institute for Basic Science)

11/06/2026, 11:30