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2025 CAU-IBS Beyond the Standard Model Workshop

→ Asia/Seoul
Chung-Ang University

Chung-Ang University

Centennial 310-B602, Chung-Ang University, Seoul 06974, Republic of Korea
Description

The 2025 Chung-Ang University Beyond the Standard Model (CAU BSM) Workshop is the fifth international meeting on Physics Beyond the Standard Model (Higgs, Dark Matter, Neutrino, Axion, Flavor, Inflation, Gravitational Waves) in Chung-Ang University, Korea. The aim of the BSM Workshop is to discuss interesting current topics and initiate the collaboration between experts and participants working on BSM physics in the globe. The fifth workshop will be held as the joint efforts between CAU and Center for Theoretical Physics of the Universe in Institute for Basic Science. Registered participants are supposed to attend the workshop only in person. We hope that the CAU workshop is to keep the community moving with lively discussion and participation.

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Time Table


 

Zoom links

One talk in S5(Tue) and two talks in S16(Thu) will be given on zoom. Here are the zoom links for them.

S5(Feb 18, Tue):

Topic: CAU-IBS BSM workshop
Time: Feb 18, 2025 09:30 AM Seoul
Join Zoom Meeting
https://cau.zoom.us/j/4611373590?pwd=C3OWP8qRgZevqBdXFQj3ndcFgsILIm.1&omn=87403017731

Meeting ID: 461 137 3590
Passcode: CAUBSM25

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S16(Feb 20, Thu):

Topic: CAU-IBS BSM workshop
Time: Feb 20, 2025 04:00 PM Seoul
Join Zoom Meeting
https://cau.zoom.us/j/4611373590?pwd=C3OWP8qRgZevqBdXFQj3ndcFgsILIm.1&omn=82511261714

Meeting ID: 461 137 3590
Passcode: CAUBSM25

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Invited speakers

Eung Jin Chun (KIAS)

Nathaniel Craig (UCSB)

Marcos Garcia (Mexico Univ)

Jinn-Ouk Gong (Ewha Womans Univ)

Ke Han (Shanghai Jiao Tong Univ)

Deog Ki Hong (PNU)

Sungwoo Hong (KAIST)

Alejandro Ibarra (TUM)

Sang Hui Im (IBS-CTPU-PTC)

Tae Hyun Jung (IBS-CTPU-PTC)

Yeongduk Kim (IBS-CUP)

Pyungwon Ko (KIAS)

Youngjoon Kwon (Yonsei)

Yann Mambrini (IJCLab, Orsay)

Chang-Seong Moon (KNU)

Jong Chul Park (CNU)

Myeonghun Park (Seoultech)

Seong Chan Park (Yonsei)

Josef Pradler (Vienna Univ)

Stefano Scopel (Sogang Univ)

Chang Sub Shin (CNU)

Seodong Shin (JBNU)

Yong Tang (UCAS)

Masahide Yamaguchi (IBS-CTPU-CGA)

Tevong You (King's College London)

SungWoo Youn (IBS-CAPP)

Hai-Bo Yu (UC Riverside)

Seokhoon Yun (IBS-CTPU-PTC)

 

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CAU BSM 2025 poster.png
Contact: Prof. Hyun Min Lee
Participants
80 View full list
  • Monday 17 February
    • DM
      • 1
        Astrophysical Probes of Dark Matter
        Speaker: Hai-Bo Yu (University of California Riverside)
        2025ChungAng_HAIBOYU.pdf
    • 10:30
      Break
    • DM
      • 2
        Connecting the baryons to the dark matter of the Universe
        Speaker: Alejandro Ibarra (Technical University of Munich)
        Ibarra_CAU.pdf
      • 3
        Status of Boosted Dark Matter
        Speaker: Prof. Jong-Chul Park (Chungnam National University (KR))
        2025CAU-BSM_JCPark.pdf
    • 12:20
      Lunch
    • Neutrino
      • 4
        Recent research results of Center for Underground Physics
        Speaker: Prof. Yeongduk Kim (Institute for Basic Science (IBS), South Korea)
        caubsm25-ydkim-long.pdf
      • 5
        Searching for Neutrinoless double beta decay with PandaX
        Speaker: Prof. Ke Han (Shanghai Jiao Tong University)
        PandaX_NLDBD_KeHan.pdf
    • 15:20
      Break
    • Neutrino & DM
      • 6
        Phenomenology of Dirac neutrino EFT
        Speaker: Eung Jin Chun (Korea Institute for Advanced Study)
        250217 CAU DNEFT.pdf
      • 7
        Reactor antineutrinos through the neutrino inelastic scattering of 13C
        Speaker: Prof. Seodong Shin (Jeonbuk National University)
        CAU-BSM2025.pdf
      • 8
        New physics decaying into metastable particles: impact on cosmic neutrinos
        Speaker: Dr Kensuke Akita (Institute for Basic Science, Center for Theoretical Physics of the Universe)
        CAU_IBS_2025_Akita.pdf
      • 9
        Dark matter from simulations and astrophysics

        In an era characterized by a wide range of astrophysical and cosmological observations, the synergy of data with sophisticated simulations has enabled us to probe interesting phenomenological paradigms of particulate dark matter (DM). Self-scattering of particulate DM within the dark sector can contribute to the thermalization of the central region of a galactic halo. The self-interaction strength of DM has a significant impact on the position and velocities of DM within these thermalised regions. We conduct rigorous DM only N-body simulations of spherical isolated haloes of (10^10-10^15) M⊙ and study their matter and velocity distributions. We also report conservative bounds on the self-interaction cross-section.

        Speaker: Dr Sambo Sarkar (Jeonbuk National University)
        CAU-IBS_SamboSarkar.pdf
  • Tuesday 18 February
    • Higgs & DM
    • 10:30
      Break
    • Axion
      • 11
        Gravitational Wave with Domain Wall Dominance
        Speaker: Prof. Sungwoo Hong (KAIST)
        GW_DWD_SH_final.pdf
        recorded talk
      • 12
        Pseudo NG bosons from finite modular symmetry

        Pseudo Nambu-Goldstone (pNG) bosons can play important roles in particle physics, such as being a light dark matter (DM), the QCD axion to solve the strong CP problem, and so on. I point out that such a pNG boson is naturally realized by the finite modular symmetry, which may originate from the geometry of extra dimensions in the superstring models. An accidental global U(1) symmetry arises due to the residual ZN symmetry, when the modulus is stabilized near a fixed point of the finite modular symmetry. To illustrate, I will show the realization of the KSVZ axion model to solve the strong CP problem, where the modulus is stabilized by the radiative potential generated by the vector-like quarks, based on arXiv:2402.02071 (JHEP) and 2405.03996 (JHEP). Since the finite modular symmetries were originally used to explain the flavor structure, this observation suggests that there are non-trivial connections between the pNG mode, which may be the DM, and flavor physics. If time permits, I will discuss the existence of such pNG mode in other stabilization mechanisms and possible applications to particle physics based on 2409.19261 and 2412.18

        Speaker: Dr Junichiro KAWAMURA (Institute for Basic Science, Keio University)
        slide_pNGmodular_CAU.pdf
    • 12:10
      Lunch
    • Axion
    • 15:40
      Break
    • Higgs & DM
      • 16
        New physics searches with unconventional signatures at the LHC
        Speaker: Chang-Seong Moon (Kyungpook National University (KR))
        25.02.18 CAU-IBS2025 2025 CAU-IBS Beyond the Standard Model Workshop v3.pdf
      • 17
        Celestial bodies as WIMP detectors

        Celestial bodies can cathalize WIMP annihilations, providing a promising way to detect them. Moreover, celestial bodies and direct detection probe the same WIMP-nucleus scattering process in a complementary way, allowing to remove the uncertainty on the velocity distribution. Thanks to their gravitational acceleration celestial bodies also allow to extend the experimental sensitivity to a larger parameter space because WIMPs scatter off nucler targets at a larger speed compared to terrestrial detectors.

        Speaker: Stefano Scopel (Sogang University)
        Scopel_CAU_IBS_2025.pdf
      • 18
        Revisiting the decoupling limit of the Georgi-Machacek model with a scalar singlet
        Speaker: Dr ROJALIN PADHAN (Chung-Ang University)
        CAU_BSM_Rojalin.pdf
  • Wednesday 19 February
    • DM
      • 19
        Light Dark Matter: showcases from cosmology, astrophysics and experiment
        Speaker: Josef Pradler (University of Vienna & Austrian Academy of Sciences (AT))
        2025Seoul_CAUBSM.pdf
    • 10:30
      Break
    • Higgs & DM
    • 12:10
      Lunch
    • Phase transitions
      • 22
        Primordial black holes from an interrupted phase transition
        Speaker: Dr Tae Hyun Jung (IBS-CTPU)
        PBH_CAU.pdf
      • 23
        Gravitational Waves from a First-Order Phase Transition of the Inflaton
        Speaker: Joern Kersten (University of Bergen)
        InflatonFOPT.pdf
      • 24
        Bubble wall dynamics at the electroweak phase transition

        The early Universe provides a unique environment to explore fundamental physics, offering extreme conditions that allow theoretical models to be tested, and opening the possibility to probe particle physics at energy scales far beyond the reach of current and future accelerators. In this respect, among the various cosmological phenomena of interest, first-order phase transitions play a prominent role, as they may have left a variety of experimentally accessible signatures. A first order phase transition proceeds through a process of nucleation, growth and merger of bubbles of true vacuum in a false vacuum background. The dynamics of this process is governed by the density perturbations and the non-trivial spatial profiles generated by the propagation of the bubble wall in the false vacuum sea. The determination of the wall expansion velocity is crucial to assess the experimental signatures of the transition. In this talk, I will report on recent advances in the quantitative theoretical description of bubble dynamics, and present numerical results for the bubble wall velocity and the plasma and fields profiles that describe the phase transition dynamics.

        Speaker: Dr Carlo Branchina (Chung-Ang University)
        Carlo Branchina v2.pdf
    • 15:30
      Break
    • Flavor & Neutrino
      • 25
        Recent Highlights from Belle II and Belle Physics
        Speaker: Youngjoon Kwon
        CAU_BSM_Y.Kwon_2025_v.1.1.pdf
      • 26
        Effects of NSI on neutrino oscillation

        In this talk, I will explore Non-Standard Neutrino Interactions (NSIs) and their effects on neutrino oscillation parameters. I will discuss the LMA-Dark solution and the degeneracies induced by NSIs in the measurement of (\delta_{CP}). Additionally, I will examine the impact of NSIs on solar and atmospheric neutrinos.

        Speaker: Pouya Bakhti (JBNU)
        presentation_1.pdf
      • 27
        Radiative corrections to the QCD θ parameter at the two-loop level

        Radiative corrections to the QCD θ parameter have been evaluated in terms of the imaginary part of the radiative quark mass phase, e.g. using the Fujikawa method. We have evaluated the radiative correction to the QCD θ at the 2-loop level by direct calculation of the Feynman diagram using a toy model with CP-violating Yukawa coupling. We show that the diagrammatic method is consistent with the low energy effective field theory approach and includes the contributions not coming from the quark mass phase. We also show that in some cases the Fujikawa method may not be sufficient to evaluate the QCD θ. This talk is based on JHEP 02 (2024) 195.

        Speaker: Tatsuya Banno (Nogoya Univ)
        cauibs2025_banno.pdf
    • Discussion
    • 18:30
      Banquet

      Eden restaurant in Yeouido - Korean traditional foods and beverages
      서울 영등포구 의사당대로 127 롯데캐슬엠파이어 B-006호
      https://naver.me/GHvq7ssE
      https://maps.app.goo.gl/1m21ddpZmUgq3Rus9

  • Thursday 20 February
    • Inflation & GW
      • 28
        Dark Matter from Inflation and Reheating
        Speaker: Prof. Marcos A. Garcia Garcia (Instituto de Fisica, UNAM)
        CAU_talk.pdf
    • 10:30
      Break
    • Inflation & GW
      • 29
        Probing Dark Matter with Gravitational-Wave Detectors in Space
        Speaker: Dr Yong Tang (University of Chinese Academy of Sciences)
        CAU_Yong_Tang.pdf
      • 30
        Quantum aspects of inflationary gravitational waves
        Speaker: Jinn-Ouk Gong
        2025-02-20_cau_jgong.pdf
    • 12:20
      Lunch
    • DM
      • 31
        Heavy dark matter and the evolution of the early universe
        Speaker: Chang Sub Shin (Institute for Basic Science)
        20250220_CAU2025_CSS.pdf
        20250220_CAU2025_CSS.pptx
      • 32
        Probing heavy dark matter with red giants

        Astrophysical objects provide an alternative way to probe the properties of dark matter. As dark matter particles transit a star, they can be captured by losing energy through scattering with the nuclei in the star. The accumulation of dark matter particles and their interaction with the nuclei can change the evolution of the star. We focus on the red giants which are in the late phase of stellar evolution after hydrogen is exhausted in the core. During the main sequence phase and red giant phase, if a large amount of dark matter particles can be captured by the star, the scattering between dark matter particles and the helium core of the red giant can lead to temperature increase, which can significantly change the fusion rate of helium and therefore the evolution of the red giant. We derive the condition for the ignition of the red giant core due to such heating effect from dark matter and discuss the constraints on the parameter space of heavy dark matter.

        Speaker: Dr Minxi He
        probing dark matter with red giants.pdf
      • 33
        Dark Photons can Prevent Core-Collapse Supernova Explosions

        During the accretion phase of a core-collapse supernova (SN), dark-photon (DP) cooling can be largest in the gain layer below the stalled shock wave. In this way, it could counter-act the usual shock rejuvenation by neutrino energy deposition and thus prevent the explosion. This peculiar energy-loss profile derives from the resonant nature of DP production. The largest cooling and thus strongest constraints obtain for DP masses of 0.1–0.4 MeV, a range corresponding to the photon plasma mass in the gain region. Electron-capture SNe, once observationally unambiguously identified, could provide strong bounds even down to nearly 0.01 MeV. For a coupling strength so small that neutrino-driven explosions are expected to survive, the DP cooling of the core is too small to modify the neutrino signal, i.e., our new argument supersedes the traditional SN1987A cooling bound.

        Speaker: Dr Seokhoon Yun (IBS-CTPU)
        CAUBSM_S.Yun_20.02.25.pdf
    • 15:30
      Break
    • Inflation & GW
      • 34
        Gravitational production in the early Universe
        Speaker: Yann Mambrini
        CAU BSMpdf.pdf
      • 35
        Reconciling cosmological tensions with inelastic dark matter and dark radiation

        In this talk I will introduce a novel particle physics framework addressing multiple cosmological tensions, including discrepancies in the Hubble parameter, S8, and Lyman-\alpha forest data. This model, SIDR+z_t (Self-Interacting Dark Radiation with transition redshift), features an inelastic dark matter (IDM) scenario coupled with dark radiation under a dark gauge symmetry. The model incorporates cold dark matter, strongly interacting dark radiation, and their interactions, suppressing free-streaming effects and attenuating the matter power spectrum at small scales. The inelastic nature of dark matter introduces a distinct temperature-dependent interaction rate, crucial for resolving Lyman-\alpha discrepancies. Solving the relevant Boltzmann equations, we explore the model’s consistency with Big Bang Nucleosynthesis and its ability to produce additional contributions prior to recombination while achieving the correct dark matter relic density.

        Speaker: SATYABRATA MAHAPATRA (Sungkyunkwan University)
        CAU_BSM_2025_Satyabrata.pdf
      • 36
        Is leptogenesis during gravitational reheating flavourful?
        Speaker: ARGHYAJIT DATTA
        cau-ibs.pdf
      • 37
        Modern Computational Approaches to Early Universe Modeling

        In physics, while analytical calculations remain appealing, there are situations where the use of computers becomes indispensable. A straightforward example is the three-body problem, where even the interactions of just three bodies are challenging to solve analytically. This necessity is similarly evident in studies of the early universe. Understanding the dynamics of the inflaton requires numerical analysis through lattice simulations in this context. Accessing high-performance computing (HPC) used to be difficult, but it is now widely available and significantly more powerful. We apply numerical results obtained through HPC to various physical problems, including the dark matter problem. However, practical constraints still hinder our ability to fully simulate the early universe, so we are exploring machine learning as a means to overcome these challenges.

        Speaker: Jong-Hyun Yoon
        20250220_CAU_YOON.pdf
  • Friday 21 February
    • Inflation & GW
      • 38
        Cosmological Collider Physics
        Speaker: Masahide Yamaguchi (Tokyo Institute of Technology)
        CAU25_yamaguchi.pdf
    • 10:30
      Break
    • Inflation & GW
      • 39
        Quintessence Inflaton
        Speaker: Prof. Seong Chan Park (Yonsei University)
        scp.pdf
      • 40
        Model building aspects of cosmological collider

        The cosmological collider program, which aims to extract direct information about heavy particles during inflation via primordial non-Gaussianity, has attracted attention as it offers a window into high-energy physics beyond the reach of terrestrial experiments. However, analyses based on concrete particle physics models remain limited, and it is still unclear under what conditions a large cosmological collider signal can be generated. In this talk, we investigate the criteria for achieving a large signal in a generic framework, focusing on tree-level massive scalar exchange. We further confirm our findings explicitly using several multifield R² inflation models.

        Speaker: Shuntaro AOKI
        CAU2025_aoki.pdf
    • 12:10
      Lunch
    • DM
      • 41
        A few topics in dark matter physics with RHN portals
        Speaker: Prof. Pyungwon Ko (KIAS (Korea Institute for Advanced Study))
        CAU BSM 2025.pdf
      • 42
        Dark gauge-mediated supersymmetry breaking with a massless dark photon

        The kinetic mixing with dark U(1) gauge can mediate the supersymmetry breaking with significant distortions of the mass spectrum and distinct phenomenology. This talk is based on our recent paper (arXiv: 2412.17777).

        Speaker: Yechan Kim (KAIST)
        YechanKim DarkGMSB CAUBSM2025.pdf
      • 43
        Heavy Dark Photon Cosmological and Astrophysical Bounds revised
        Speaker: Jaeyoung Park
        2025CAU_workshop_JYP.pdf
    • 15:20
      Break
    • DM
      • 44
        Vector dark matteer at low reheat temperature Including decay
        Speaker: Sarif Khan (Goettingen University)
        Khan-CAU-IBS-talk.pdf
      • 45
        Indirect dark matter searches with the CTAO telescope

        The dark matter problem is one of the most elusive problems of modern physics and several extensions of the Standard Model have been proposed to address this puzzle. One of the relevant hypotheses is known as "Weakly Interacting Massive Particles": massive particles in the GeV-TeV scale with a weak coupling to the SM sector. One of the detection approaches for WIMPs is the indirect detection method: DM particles may self-annihilate in astrophysical objects and produce an excess in the fluxes of SM particles, which can propagate and reach observatories on Earth. Gamma rays are particularly interesting among these messengers because they do not suffer propagation effects. One of the most important future gamma-ray telescopes is the Cherenkov Telescope Array Observatory (CTAO). The CTAO will increase the sensitivity of the current experiments by one order of magnitude and probe masses for thermal DM in the (0.1 - 10) TeV range, being a fundamental test for the WIMP paradigm in the future. In this talk, I will present the most important characteristics and strategies of DM indirect searches with the CTAO and the expected limits for some specific BSM theories.

        Speaker: Lucca Radicce Justino
        CAU_BSM2025_Justino.pdf
      • 46
        Late-time Cosmology without Dark Sector but with Closed String Massless Sector

        We explore the possibility of solving the dark energy and the coincidence problems by postulating the massless sector of closed strings. This sector constitutes the gravitational multiplet of string theory and, when applied to four-dimensional cosmology, predicts that \textit{the expansion of an open Universe defined in string frame is readily accelerating}. We confront the prediction with the late-time cosmological data of Type Ia supernovae and quasar absorption spectrum, which probe the evolutions of the Hubble parameter and possibly the fine-structure constant. We report that these observations are in admirable agreement with the prediction without any dark sector or coincidence problem. We estimate the Hubble constant, 71.2 km/s/Mpc.

        Speaker: Dr Hocheol Lee (Sogang Univ)
        250221_Chung-Ang_Hocheol.pdf
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