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Ki-Young Choi (Sungkyunkwan University (KR))07/06/2026, 14:00
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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...
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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...
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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...
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Seokhoon Yun (Kyungpook National University)07/06/2026, 15:45
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Sudhakantha Girmohanta07/06/2026, 16:15
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Michael Shamma (Korea Institute for Advanced Study)07/06/2026, 16:30
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Jun-Ho Song (Chung-Ang University)07/06/2026, 16:45
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Anson Hook (University of Maryland)08/06/2026, 09:30
We discuss relaxation solutions to the dark matter - baryon coincidence problem in the context of QCD axion dark matter. In relaxation solutions, a moduli dynamically adjusts the mass of dark matter and baryons until their energy densities are O(1) the same. Because the QCD axion is heavily connected to QCD, scanning the QCD axion mass inherently also scans the proton mass. In the context of...
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Prof. Hyung Do Kim (Seoul National University)08/06/2026, 11:00
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Heejoo Kim (KIAS)08/06/2026, 11:30
The pre-inflationary axion dark matter scenario, with its uniform initial misalignment angle, is conventionally expected to yield smooth dark matter without substructure. We explore scenarios of pre-inflationary axion cosmology, where adiabatic temperature perturbations from inflation can source non-trivial axion density fluctuations through both the temperature-dependent QCD axion mass and...
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Misao Sasaki08/06/2026, 14:00
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Jinn-Ouk Gong08/06/2026, 14:30
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Chang Sub SHIN (Chungnam National University)08/06/2026, 15:00
We formulate a new class of primordial perturbations called \textit{kinetic isocurvature perturbations}, where the mass density of dark matter is constant relative to the photon number density while the kinetic energy of dark matter fluctuates in space. Such perturbations naturally arise in scenarios where a nonrelativistic heavy field decays into relativistic dark matter particles with a...
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Prof. Yeongduk Kim (Institute for Basic Science (IBS), South Korea)08/06/2026, 16:00
I would like to review future double beta decay experiments in terms of background, exposure, schedule, and sensitivities.
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Chang-Seong Moon (Kyungpook National University (KR))08/06/2026, 16:30
Hidden-sector models provide a well-motivated framework for physics beyond the Standard Model, offering potential explanations for dark matter and other unresolved questions in particle physics. In a broad class of these models, particles produced at the Large Hadron Collider (LHC) may undergo complex showering and hadronization processes within a hidden strongly interacting sector. The...
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Prasenjit Sanyal (Asia Pacific Center for Theoretical Physics)08/06/2026, 17:00
In this talk, I will discuss an alternative production mechanism for long-lived heavy neutrinos within the framework of neutrinophilic Higgs doublet models, where an additional Higgs doublet couples exclusively to the Standard Model (SM) lepton doublets and right-handed neutrinos (RHNs). This structure allows the vacuum expectation value (VEV) of the extra Higgs doublet to be much smaller than...
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Jure Zupan (University of Cincinnati)09/06/2026, 09:30
I will review how rare tau and muon transitions can be used to search for new physics. Of special interest are decays into light new physics states, that still lead to visible exotic signatures.
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Dr Liang Sun (Wuhan University (CN))09/06/2026, 11:00
The BESIII experiment is a symmetric e+e- collider operating at c.m.
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energy from 2.0 to 4.95 GeV. With the world’s largest threshold
production data set of J/ψ (10 billion), ψ(3686) (2.6 billion), and
millions of D(s) meson pairs, we are able to search for various BSM
particles (dark sector, Z', X(17), etc) produced in e+e- annihilation
and meson decay processes, as well as searching for... -
Prof. Youngjoon Kwon (Yonsei University)09/06/2026, 11:30
In this talk, we present recent results on dark sector search at Belle II experiment. In particular, we will report the searches for dark Higgs in inelastic dark matter scenario, axion-like particle searches both in ISR continuum and in B decays, and feebly-interacting particles in B decays. In addition, we will also report a few recent highlights including updates of R[D(*)] and B+ -> mu+ nu.
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Sungwoo Hong09/06/2026, 14:00
In this talk, I will introduce the notion of global aspects in the physics of particles and topological defects by taking a concrete example of DFSZ axion model. In particular, I will describe how various global structures play important roles in the domain wall problem of the DFSZ axion model. A precise identification of the axion string–domain wall network—and hence the true nature of the...
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Ryosuke Sato09/06/2026, 14:30
Although the QCD Lagrangian allows CP violation by the theta-term, no such effect has been observed yet. This puzzle is called the strong CP problem. In this talk, I will review a recent debate on the order of limit in the path integral formulation of strong CP violation, and discuss the validity of the formulation by focusing on quantum mechanics on a circle.
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Dr Taewook Youn (Cornell University)09/06/2026, 15:00
We present a holographic construction of the QCD axion based on a warped 5D model. A key ingredient of our setup is the introduction of a bulk scalar field $\theta$ which is holographically dual to the topological operator of QCD. We identify the bulk modes corresponding to the $\eta'$ and axion states, and show that an adjustment analogous to that of the usual 4D axion takes place.
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We... -
Dr SungWoo Youn (Institute for Basic Science)09/06/2026, 15:45
The QCD axion is a well-motivated dark matter candidate arising from both the strong CP problem and cosmology. Recent advances in haloscope experiments and quantum-limited microwave detection have substantially expanded the search sensitivity toward the QCD axion parameter space. In this talk, I will review the current status of axion dark matter searches and present recent experimental...
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Kai Schmitz09/06/2026, 16:15
I will review the 2023 pulsar timing array (PTA) evidence for a
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stochastic gravitational-wave background at nanohertz frequencies and
discuss how PTA observations allow us to search for new particle and
gravitational physics, including: (1) physics beyond the Standard Model
in the early Universe, (2) dark matter in our galaxy and in the vicinity
of supermassive black-hole binaries, and... -
Prof. Jong-Chul Park (Chungnam National University (KR))09/06/2026, 16:45
We propose a novel detection strategy for super-light dark matter (DM), m_DM ~ O(keV), using a detector based on Graphene Josephson Junctions (GJJ). By intimately integrating the π-bond electrons of graphene as the target material into a Josephson junction, we create a sensor capable of detecting energy deposits as small as O(meV). We evaluate the scattering rates between DM and free electrons...
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Seong-Sik Kim (Chungnam National University)09/06/2026, 17:15
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Raymond Co (Indiana University)10/06/2026, 09:30
We propose a framework in which the QCD axion simultaneously accounts for the baryon asymmetry and contributes to dark matter through its early-universe rotation. A Peccei–Quinn (PQ) field rotation corresponds to a conserved PQ charge, which can be transferred to baryon number via sphaleron processes (axiogenesis) and to the axion abundance through its kinetic energy (the kinetic misalignment...
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Ｗen Yin10/06/2026, 11:00
Low-scale inflation is increasingly motivated by current observational constraints. In this talk, I will discuss a generic dynamical feature that arises after inflation in a broad class of single-field models. A tachyonic instability can develop immediately after the end of inflation, leading to the rapid growth of field fluctuations and highly nonlinear dynamics. This process results in the...
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Sung Hoon Jung (Seoul National University)10/06/2026, 11:30
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Hyung Mok Lee (Korea Astronomy and Space Science Institute)10/06/2026, 14:00
The year 2025 marks ten years since the landmark detection of GW150914, which inaugurated gravitational-wave astronomy. Across four observing runs of the LIGO–Virgo–KAGRA (LVK) network, more than 300 events — primarily binary black hole mergers — have been detected, enabled by steady improvements in detector sensitivity and a rapidly expanding observable volume. These discoveries have reshaped...
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Dr Donghui Jeong (The Pennsylvania State University)10/06/2026, 14:30
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Prof. Seong Chan Park (Yonsei University)10/06/2026, 15:00
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Dumitru Ghilencea (Horia Hulubei National Institute of Physics and Nuclear Engineering (RO))10/06/2026, 16:00
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Vlad-Mihai Mandric (IFIN-HH)10/06/2026, 16:30
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Yuma Narita (Tohoku Univ.)10/06/2026, 16:45
Axion-like particles (ALPs) are among the leading dark-matter candidates. In the minimal cosine potential, cosmology imposes a robust requirement: by the epoch when ALPs behave as matter, the potential height needs to exceed the ALP energy density. This translates into a lower bound on the decay constant. A plausible loophole is to store most of the energy in nonzero-momentum modes while...
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Atsushi Taruya (Yukawa Institute for Theoretical Physics / Korea Institute for Advanced Study)10/06/2026, 17:00
We present a novel framework to search for dark matter (DM) through its electromagnetic (EM) signatures in the terrestrial environment. Ultralight DM candidates, such as axions and dark photons, can induce nearly monochromatic EM fields via their coupling to ordinary photons. In the presence of the geomagnetic field, axion DM induces extremely low-frequency EM signals in the Earth–ionosphere...
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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...
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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...
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Dr Kyu Jung Bae (Institute for Basic Science)11/06/2026, 11:30
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Prof. Myeonghun Park (Seoultech)11/06/2026, 14:00
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Jae Hyeok Chang (Seoul National University)11/06/2026, 14:30
We propose a novel mechanism for the cosmological production of keV - GeV mass dark matter that interacts with the Standard Model through a small effective magnetic dipole moment. Such an interaction can be radiatively generated if dark matter couples to heavier charged particles. Previous studies have focused on the case where these charged states are much heavier than the reheat temperature,...
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Gyunho Yu (Institute for Basic Science)11/06/2026, 15:30
The detection of coherent elastic neutrino–nucleus scattering (CEvNS) is one of the primary research goals in contemporary neutrino experiments. Its observation provides critical insights not only into the Standard Model but also into physics beyond it, such as non-standard neutrino interactions, and establishes the so-called neutrino floor relevant for dark matter searches. Consequently,...
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Mr Sahabub Jahedi (Indian Institute of Technology, Guwahati)11/06/2026, 16:00
In this talk, I will present the prospect of lepton-flavor-violating (LFV) interactions of dark matter (DM) within an effective field theory framework, going beyond the conventional flavor-conserving paradigm. Considering scalar, fermion, and vector DM candidates, I study the three-body decays of charged leptons into a lighter lepton and a pair of DM particles. The invariant-mass distributions...
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Ranjeet Kumar (Seoul National University of Science and Technology)11/06/2026, 16:15
In this talk, I will discuss a flavour model based on an $A_4$ symmetry combined with a type-II seesaw mechanism for neutrino mass generation. The resulting neutrino mass matrix obeys a sum rule that, together with the measured mass-squared differences, fully determines the absolute neutrino mass spectrum. The constrained flavour structure
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yields correlated predictions for lepton mixing... -
CHANDRIMA SEN
In this talk, I will discuss the prospects of probing a light scalar state in the Type-I Two-Higgs Doublet Model (2HDM) at the LHC. In this framework, one of the additional scalar states can be as light as $\lesssim 100$ GeV while remaining consistent with current collider and flavour constraints, yet it can evade conventional search strategies due to its suppressed couplings to the SM Higgs...
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Prof. Sin Kyu Kang (Seoul National University of Science and Technology)
We study a sequestered realization of spontaneous CP violation in an extension of the DFSZ axion framework.
CP is imposed at the Lagrangian level, so that all couplings and mass parameters are real.
The only physical source of CP violation arises from a PQ-invariant relative alignment of the singlet vacuum expectation values.
Since this CP-odd vacuum parameter is orthogonal to the...
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