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Patrick Fox (Fermilab)24/08/2026, 09:30
Axion light particles are a well-motivated example of light, weakly coupled BSM states. I will investigate the constraints on such particles through their couplings to tau leptons. I will discuss situations where the ALPs are long lived and the best search strategy is through beam dumps (both past and future experiments) and the situation where the ALP decays promptly which can result in...
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Yue Zhao (HKUST)24/08/2026, 10:10
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Tanmay Kumar Poddar (IPPP, Durham University)24/08/2026, 10:50
Ultralight bosons are well-motivated candidates for dark matter and new long-range interactions. Their tiny masses can generate macroscopic coherence and long-range effects, making compact objects powerful probes of extremely weak new physics. In this talk, I will review searches for ultralight bosons using neutron stars, pulsars, black holes, and compact binaries. I will highlight signatures...
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Boris Betancourt Kamenetskaia (Institute for Basic Science CTPU-CGA)24/08/2026, 13:30
Can gravitational waves reveal the properties of dark matter? Compact binaries embedded in extended dark matter configurations provide a unique opportunity to probe the macroscopic behavior of the dark sector. If a neutron star or black hole is surrounded by a sufficiently massive and extended dark matter envelope, an inspiraling companion experiences dynamical friction in addition to the...
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Huangyu Xiao24/08/2026, 14:10
We propose a natural framework for interacting dark matter and dark energy based on axion–monopole dynamics in a dark gauge sector. Dark matter is composed of dark ’t Hooft–Polyakov monopoles, while dark energy is an ultralight axion whose coupling to the dark gauge field induces an axion-dependent dyon mass through the Witten effect. This generates a direct dark matter–dark energy...
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Edoardo Vitagliano (Max Planck Institute for Physics)24/08/2026, 15:20
While it is way too early to make a final judgement, it is noteworthy that searches at LHC and direct detection experiments reported null results, therefore boosting the ever growing interest in sub-GeV dark sector candidates. Owing to their high temperature and density, the cores of proto-neutron stars, remnant of core-collapse supernovae and neutron star mergers, can be factories of axions...
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Chui-Fan Kong (IBS-CTPU-PTC)24/08/2026, 16:00
Core-collapse supernovae are powerful probes of physics beyond the Standard Model (BSM). In this talk, I will show how the circumstellar medium (CSM) affects supernova-based BSM searches using dark photons as an example. The decay product of dark photon can heat up CSM and lead to extra blackbody emission. Using the early-time observations of SN 2023ixf, we derive the strongest constraint on...
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Mr Ju Hyeong Kang (Pusan National University)24/08/2026, 16:40
We investigate supernova cooling bounds on an MeV-scale dark Z boson with mass mixing. For a dark Z much lighter than the Standard Model Z boson, the kinetic mixing contribution to its coupling with the neutral current is strongly suppressed, while the mass mixing contribution remains sizable. This allows the dark Z to be efficiently produced in the dense medium of a core-collapse supernova...
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Fuminobu Takahashi (Tohoku University)25/08/2026, 09:30
We show that anomaly cancellation, usually imposed as a condition for quantum consistency, can also serve as a principle for organizing particle spectra in chiral gauge theories. For a broad class of spectra charged under both a vector-like gauge symmetry and a chiral gauge symmetry, the anomaly equations are exactly equivalent to the degree-3 Prouhet–Tarry–Escott problem in number theory....
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Andre de Gouvea (Northwestern University)25/08/2026, 10:10
We discuss the next-to-leading-order corrections to the neutrino oscillation phase and applying the result to reactor antineutrinos. At next-to-leading order, the oscillation phase includes terms proportional to m_i^4-m_j^4 = Delta m^2_{ij}(m_i^2+m_j^2), and is therefore sensitive to the absolute mass scale. We estimate the sensitivity of JUNO to the absolute neutrino mass scale.
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Arunansu Sil (Indian Institute of Technology Guwahati)25/08/2026, 10:50
We propose a low-scale leptogenesis scenario within the neutrino seesaw framework, where CP-violating decays of right-handed neutrinos (RHN) generate the required lepton asymmetry even for RHN masses below the Standard Model Higgs mass. This is achieved by delaying the sphaleron decoupling through a first-order electroweak phase transition, allowing efficient conversion of lepton asymmetry...
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Patrick Foldenauer (IFT UAM-CSIC Madrid)25/08/2026, 13:30
Vector portal interactions provide a simple and theoretically well-motivated framework for connecting dark sectors to the Standard Model. In particular, dark photons and anomaly-free gauge bosons arise naturally in extensions of the Standard Model and can play a central role in dark matter phenomenology. In this talk, I first discuss scenarios in which dark photons mediate the interactions of...
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Seongsik Kim (Chungnam National University)25/08/2026, 14:10
We develop a systematic approach for analyzing any dark matter (DM) model that produces boosted dark matter (BDM) through semi-annihilation. We emphasize three points. First, any BDM analysis must be grounded on the correct relic density. Second, semi-annihilation intrinsically yields boosted by-products, whose contribution to indirect detection is generally non-negligible and should be...
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Prof. Tanner Trickle (University of Illinois Urbana-Champaign)25/08/2026, 15:20
Recent years have seen a dramatic expansion in ideas regarding the nature of dark matter, extending beyond the weakly-interacting massive particle (WIMP) paradigm. Many of these theories predict minuscule couplings between light (sub-GeV mass) dark matter and the Standard Model, which direct detection experiments can search for. In this talk we will begin by reviewing the status of current...
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Dong Woo Kang (Yonsei University)25/08/2026, 16:00
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SangHwan Kim (Yonsei University)25/08/2026, 16:40
Galactic Center Excess (GCE) remains one of the most interesting unknown signals in the domain of few GeV gamma-rays. Since its morphology prefers spherical symmetry, dark matter annihilation can be an intriguing explanation of the GCE. In this work, we tested the possibility of cascade annihilation of dark matter, such as into four-b quarks with boost effect. At the same time, utilizing the...
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Gongjun Choi (University of Minnesota)26/08/2026, 09:30
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Kylar Greene (Seoul National University)26/08/2026, 10:10
Many cosmological observables are sensitive primarily to ratios of physical scales rather than their absolute values. This motivates the FFAT scaling symmetry, in which correlated changes to the expansion history, primordial fluctuations, and scattering rates can leave much of the CMB phenomenology nearly unchanged while shifting the inferred absolute expansion scale. I will discuss how this...
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Heejoo Kim (KIAS)26/08/2026, 10:50
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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Peizhi Du (University of Science and Technology of China)26/08/2026, 13:30
The standard cosmological model (ΛCDM model) assumes adiabatic initial conditions for primordial density perturbations. However, many new physics scenarios can deviate from this assumption and generate isocurvature perturbations across a wide range of scales. In this talk, I will discuss how isocurvature can induce gravitational waves at second order in perturbation theory. Moreover, Pulsar...
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Sudhakantha Girmohanta (Institute for Basic Science, CTPU-PTC, Korea)26/08/2026, 14:10
The discovery of a nano-Hz stochastic gravitational wave background by Pulsar Timing Array (PTA) collaborations can be interpreted as arising from a strongly supercooled phase transition in a nearly conformal dark sector. I will present a concrete model for this phase transition, and show that the strong supercooling it requires generically dilutes any pre-existing baryon asymmetry and dark...
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Tae Hyun Jung (IBS CTPU)26/08/2026, 15:20
Pulsar timing arrays reported strong evidence for a stochastic gravitational-wave background whose peak frequency corresponds to the Hubble scale at a temperature of O(100) MeV in the early Universe, redshifted to the present. Such a signal had already been predicted in the QCD-induced little inflation scenario proposed by Boeckel and Schaffner-Bielich in 2009. In this talk, I revisit this...
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Yeji Park (IBS-CTPU-PTC)26/08/2026, 16:00
Primordial black holes form with an extended mass function whose shape encodes the physics of their formation. As the universe ages, Hawking evaporation reshapes that function, eroding it from below and thereby fixing the distribution that present observational constraints actually probe. An analytic parametrization of this object underlies every downstream analysis, yet the fitting forms in...
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Min-Gwa Park (Northwestern University)26/08/2026, 16:40
Accelerator neutrino experiments provide profound opportunities for Beyond the Standard Model physics searches. Among them, the near detector of DUNE experiment and its off-axis displacement, DUNE-PRISM, are widely studied utilizing energy and angular spectrum difference between SM and BSM interactions. There are other types of searches that utilize additional BSM neutrino flux, and tau...
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Enrico Lunghi (Indiana University)27/08/2026, 09:30
Over the past decade, the LHCb and CMS experiments have reported persistent tensions in several branching fractions and angular observables of exclusive $b \to s \mu^+\mu^-$ decays. Taken together, these discrepancies exceed the five-standard-deviation level. However, their interpretation remains the subject of active debate, particularly regarding the size and treatment of nonperturbative QCD...
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Michael Shamma (Korea Institute for Advanced Study)27/08/2026, 10:10
We study the low-energy behavior of gauge couplings in the presence of dynamical scalar backgrounds. In weakly coupled, renormalizable four-dimensional theories, gauge invariance restricts the dependence on the scalar background to be logarithmic. The gauge coupling evolution in these scenarios can be entirely described by the renormalization-group running with dynamical mass thresholds....
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Junghoon Joh (SungKyunKwan University)27/08/2026, 10:50
Dark matter (DM) can be gravitationally captured around a massive compact object, forming a dense halo. If primordial black holes (PBHs) exist, surrounding dark matter particles can be accreted through gravitational attraction, leading to the formation of a DM halo with a steep spike profile near the PBH.
If the dark matter consists of axions or axion-like particles (ALPs), the high number...
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Gongjun Choi (Institute for Basic Science (IBS))
Extra-dimensional QCD axion is well motivated by string compactifications and enjoys enhanced protection against quality-violating effects. If present during inflation, however, its quantum fluctuations generate isocurvature perturbations that strongly constrain the inflationary scale. We propose a dynamical suppression mechanism in warped five-dimensional models, where a radion-inflaton...
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Patrick Fox (Fermilab)
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SangHwan Kim (Yonsei University)
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Min-Gwa Park (Jeonbuk National University)
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