Login

Sichuan University and IBS CTPU-CGA joint workshop on frontier of theoretical particle physics and gravity

24–27 May 2026
Asia/Shanghai timezone

Prof. Takaaki Nomura

Contribution List

65 out of 65 displayed
Export to PDF
  1. 26. Opening Remarks: From Host institute
    Prof. Jiangqi Qi (Sichuan University)
    25/05/2026, 09:00
  2. 27. Opening Remarks: From co-organizing Institute
    Prof. Masahide Yamaguchi (IBS-CTPU-CGA)
    25/05/2026, 09:05
  3. 28. GUT Seesaw Parameters from Low Energy Flavor Physics Inputs
    Xiao-Gang He
    25/05/2026, 09:10
  4. 29. Cosmological signatures of neutrino seesaw mechanism
    Chengcheng Han
    25/05/2026, 09:50
  5. 30. A New Origin of the Big Bang Universe and Its Gravitational Wave Signature
    Haipeng An
    25/05/2026, 10:50
  6. 31. On homogeneous and isotropic turbulence in the early universe
    Fumio Uchida
    25/05/2026, 11:20
  7. 32. Hints and constraints on ultralight dark matter by astronomical observations
    Xiao-Jun Bi
    25/05/2026, 11:50
  8. 33. Paths to Solving the Strong CP Problem and the Footprints Left Behind
    Yuichiro Nakai
    25/05/2026, 14:00
  9. 34. Effective Field Theory and In-In Correlators
    Guanhao Sun
    25/05/2026, 14:30
  10. 35. Probing High-Energy Physics with Topological Defects
    Ivan Rybak (IBS CTPU-CGA)
    25/05/2026, 15:00
  11. 36. Abelian-Higgs vortices in the oscillating axion background
    Shota Nakagawa (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
    25/05/2026, 16:00
  12. 37. Boosted Dark Matter Heating of Compact Stars Beyond Capture
    Shihwen Hor (T. D. Lee Institute)
    25/05/2026, 16:20
  13. 38. Composite Asymmetric Dark Matter from Primordial Black Holes
    Takumi Kuwahara (Jilin U)
    25/05/2026, 16:40
  14. 39. Search for ultralight scalar dark matter with quadratic interactions
    Da Liu (Shandong University)
    25/05/2026, 17:00
  15. 40. Topics in Dark Matter Physics
    Pyungwon Ko
    26/05/2026, 09:00
  16. 41. Truth and Beauty: Quantum Entanglement Theory and Its Searches at the Colliders
    Tianjun Li
    26/05/2026, 09:40
  17. 42. An Analytic Prescription for t-channel Singularities
    Joe Sato
    26/05/2026, 10:50
  18. 43. Cosmic Neutrino Background Detection with Tritium
    Michiru Uwabo-Niibo (Institute for Basic Science)
    26/05/2026, 11:20
  19. 45. Ultimate Quantum Precision Limit at Colliders
    Jia Liu (Peking University)
    26/05/2026, 11:50
  20. 46. Axion inflation with gauged lepton flavor symmetry, large lepton asymmetry, and helium abundance
    Kohei Kamada (HIAS UCAS)
    26/05/2026, 14:00
  21. 48. Covariant scalar-tensor theories beyond second derivatives
    Pavel Petrov (IBS CTPU CGA)
    26/05/2026, 14:30
  22. 49. Observing Lorentz-violating effects on the gamma-ray horizon
    Nils Albin Nilsson (CTPU-CGA, Institute for Basic Science, Korea)
    26/05/2026, 15:00
  23. 50. The Impact of String Thickness on GW Spectrum of Cosmic String Network
    Yifan Hu
    26/05/2026, 16:00
  24. 51. Multimessenger probes of a complex singlet extension of the Standard Model
    Chikako Idegawa (Sun Yat-sen University)
    26/05/2026, 16:20
  25. 52. Metastable domain wall in the continuous U(1) group
    Yi-Lei Tang (中山大学)
    26/05/2026, 16:40
  26. 53. Supermassive Primordial Black Holes from a Catalyzed Dark Phase Transition for Little Red Dots
    Masanori Tanaka (Peking University)
    26/05/2026, 17:00
  27. 54. Impostor Among 𝜈s: Dark Radiation Masquerading as Self-Interacting Neutrinos
    Taegyun Kim (Southern University of Science and Technology (SUSTech))
    26/05/2026, 17:20
  28. 55. Exact pairs in AdS/CFT
    Haitang Yang
    27/05/2026, 09:00
  29. 56. Curvature-assisted dynamical compactification
    Yusuke Yamada (IBS CTPU-CGA)
    27/05/2026, 09:40
  30. 58. Constraints to the higher curvature terms from Cosmology
    Bum-Hoon Lee
    27/05/2026, 10:10
  31. 59. Recent progresses on $N^*(920)$ and $\sigma$ resonances
    Zhiguang Xiao
    27/05/2026, 11:10
  32. 60. Boosted dark matter from galactic and cosmological semi-annihilation
    Boris Betancourt Kamenetskaia (Institute for Basic Science CTPU-CGA)
    27/05/2026, 11:40
  33. 61. Probing quirk particle at the LHC forward detectors
    Jinmian Li
    27/05/2026, 12:10
  34. 62. Extended Scotogenic Model of Neutrino Mass and Proton Decay
    Oleg Popov (Shenzhen MSU-BIT University)
    27/05/2026, 14:00
  35. 65. Freeze-in sterile neutrino DM in a feebly gauged 𝐵−𝐿 model
    Yoshiki Uchida (Central China Normal University)
    27/05/2026, 14:20
  36. 64. Physical remnant of Electro-weak theta angle
    Zheng Sun
    27/05/2026, 14:40
  37. 20. A New Origin of the Big Bang Universe and Its Gravitational Wave Signature
    Haipeng An (Tsinghua University)

    I will talk about a new origin of the big bang universe in which the inflaton field inject all its energy into a kination dominated dark sector, and at that time the standard model sector was in a meta stable vacuum state. Then, the Hubble expansion rate drops due to the dillution of the energy in the dark sector, and when the Hubble expansion rate is small enough the phase transition in the...

    Go to contribution page
  38. 21. Abelian-Higgs vortices in the oscillating axion background
    Shota Nakagawa (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)

    Axion is one of the well-motivated candidates for dark matter and there have been many attempts for axion dark matter search. In this talk, we show novel aspects of the axion dark matter, which significantly modify the physics of vortex in the Abelian-Higgs model. Due to the axion-photon conversion, electromagnetic fields are induced in the magnetic core of the vortex. In numerical...

    Go to contribution page
  39. 15. Axion inflation with gauged lepton flavor symmetry, large lepton asymmetry, and helium abundance
    Kohei Kamada (HIAS UCAS)

    Axion inflation can have a Chern-Simons coupling to gauge fields. Depending on the gauge fields, it gives rise to the magnetic field production together with fermion asymmetry. For example, in the case of U(1) hypergauge field in the Standard Model, we generate B+L asymmetry. In this talk, I will examine the case of U(1) gauged lepton flavor symmetry, which can produce lepton asymmetry. Their...

    Go to contribution page
  40. 47. Axion inflation with gauged lepton flavor symmetry, large lepton asymmetry, and helium abundance
    Kohei Kamada (HIAS UCAS)
  41. 8. Boosted dark matter from galactic and cosmological semi-annihilation
    Boris Betancourt Kamenetskaia (Institute for Basic Science CTPU-CGA)

    In scenarios where the dark matter (DM) relic abundance is set by semi-annihilation, two DM particles can produce one dark matter particle and one Standard Model particle. These processes may still occur today in both the Milky Way galaxy and the early Universe, generating a flux of boosted DM particles. We study the resulting signals in direct detection and neutrino experiments for sub-GeV DM...

    Go to contribution page
  42. 22. Boosted Dark Matter Heating of Compact Stars Beyond Capture
    Shihwen Hor (T. D. Lee Institute)

    Compact astrophysical objects, such as neutron stars and white dwarfs, can act as detectors of energetic particle fluxes originating from astrophysical accelerators. While most existing capture and heating calculations assume isotropic very low energetic incident fluxes from the halo dark matter, many realistic sources produce highly directional beams or jets, for which gravitational focusing,...

    Go to contribution page
  43. 7. Composite Asymmetric Dark Matter from Primordial Black Holes
    Takumi Kuwahara (Jilin U)

    We investigate a cogenesis scenario for composite asymmetric dark matter framework: a dark sector has a similar strong dynamics to quantum chromodynamics in the standard model, and the dark-sector counterpart of baryons is the dark matter candidate. The Hawking evaporation of primordial black holes plays the role of a source of heavy scalar particles whose CP-violating decay into quarks and...

    Go to contribution page
  44. 2. Cosmic Neutrino Background Detection with Tritium
    Michiru Uwabo-Niibo (Institute for Basic Science)

    The Cosmic Neutrino Background (CNB) is a robust thermal relic of the Big Bang and a potential probe of neutrino mass properties and of the Universe at O(1) second. A leading direct-detection strategy is neutrino capture on tritium, where observing a distinct capture peak requires excellent effective energy resolution. In practice, binding and solid-state effects can broaden the endpoint...

    Go to contribution page
  45. 44. Cosmic Neutrino Background Detection with Tritium
    Michiru Uwabo-Niibo (Institute for Basic Science)
  46. 10. Cosmological signatures of neutrino seesaw mechanism
    Prof. Chengcheng Han (Sun Yat-sen university)

    Cosmological signatures of neutrino seesaw mechanism

    Go to contribution page
  47. 12. Covariant scalar-tensor theories beyond second derivatives
    Pavel Petrov (IBS CTPU CGA)

    We propose a covariant, gauge-independent construction of foliation-based scalar-tensor theories, yielding diffeomorphism-invariant operators involving only gradients on the hypersurfaces where the scalar field is constant, assumed to be spacelike. This defines a basis of independent invariants up to four derivatives of, including the first nontrivial parity-odd pseudoscalar at this order,...

    Go to contribution page
  48. 4. Curvature-assisted dynamical compactification
    Yusuke Yamada (IBS CTPU-CGA)

    Extra dimensions unavoidably appear in superstring theory, which is a plausible candidate for quantum gravity theory. Such extra dimensions should be small enough today to avoid observational inconsistency, which is achieved if the gravitational degrees of freedom (moduli) acquire effective potential to obtain vacuum expectation values that realize sufficiently small extra dimension volume....

    Go to contribution page
  49. 57. Curvature-assisted dynamical compactification
    Yusuke Yamada (IBS CTPU-CGA)
  50. 6. Freeze-in sterile neutrino DM in a feebly gauged $B-L$ model
    Dr Yoshiki Uchida (Central China Normal University)

    We consider the gauged U(1)$_\mathrm{B−L}$ model and examine the situation where the sterile neutrino is a dark matter candidate produced by the freeze-in mechanism. In our model, the dark matter $N$ is mainly produced by the decay of a U(1)$_\mathrm{B−L}$ breaking scalar boson $\phi$. We point out that the on-shell production of $\phi$ through annihilation of the U(1)$_\mathrm{B−L}$ gauge...

    Go to contribution page
  51. 16. Hints and constraints on ultralight dark matter by astronomical observations
    效军 毕 (中科院高能所)

    Generated by misalignment mechanism of axion-like particle dark matter may favor an ultralight mass, which can be described by classical wave field. The ultralight wave dark matter can produce fluctuating gravitational potential due to the interference between waves, which can stochastically heat the stellar systems embedded in the dark matter halo. We will talk about the observational hints...

    Go to contribution page
  52. 1. Impostor Among $\nu$s: Dark Radiation Masquerading as Self-Interacting Neutrinos
    Taegyun Kim (Southern University of Science and Technology (SUSTech))

    Multiple cosmological observations hint at neutrino self-interactions beyond the Standard Model, yet such interactions face severe constraints from terrestrial experiments. We resolve this tension by introducing a model where active neutrinos resonantly convert to self-interacting dark radiation after BBN but before CMB epoch. This exploits the fact that cosmological observables cannot...

    Go to contribution page
  53. 11. Metastable domain wall in the continuous U(1) group
    Yi-Lei Tang (中山大学)

    In the literature, the domain wall is usually connected with some discrete symmetry. For the continuous case, a discrete symmetry arises as an intermediate stage, but what if the scale of the U(1) symmetry is similar or lower with the ``discrete symmetry''? We show how the domain wall disappear and the discrete symmetry becomes invalid.

    Go to contribution page
  54. 5. Multimessenger probes of a complex singlet extension of the Standard Model
    Chikako Idegawa (Sun Yat-sen University)

    We study multimessenger probes of a complex singlet extension of the Standard Model through a strongly first-order electroweak phase transition. The same phase transition can induce primordial black hole　formation, generate stochastic gravitational waves, and modify the Higgs triple coupling.

    We explore how these observables are correlated and show that they provide complementary ways to...

    Go to contribution page
  55. 19. Observing Lorentz-violating effects on the gamma-ray horizon
    Nils Albin Nilsson (CTPU-CGA, Institute for Basic Science, Korea)

    The arrival of TeV-energy photons from distant galaxies is expected to be affected by their QED interaction with intergalactic radiation fields through electron-positron pair production. In theories where high-energy photons violate Lorentz symmetry, the kinematics of the process γ + γ → e + + e− is altered and the cross-section suppressed. Consequently, one would expect more of the...

    Go to contribution page
  56. 24. Physical remnant of Electro-weak theta angle
    瑛培 邹 (四川大学)

    In addtion to well-known strong CP violation theta angle, we find another invariant electro-weak theta angle after electro-weak symmetry breaking(EWSB), which can be another physical parameter of the Standard Model. It could be physical if the spacetime is a non-simply connected manifold beyond our visible universe or a laboratory setup of the non-simply connected background field. The new...

    Go to contribution page
  57. 66. Physical remnant of electroweak theta angles
    铮 Zheng 孙 Sun (四川大学)

    In addition to the well-known quantum chromodynamical theta angle, we show that the Standard Model has another theta angle which is invariant under arbitrary chiral rotations of quarks and leptons. The new theta angle can be identified with the quantum electrodynamical theta angle, which should be viewed as an independent parameter of the Standard Model, and may be observable in spacetime with...

    Go to contribution page
  58. 17. Probing High-Energy Physics with Topological Defects
    Ivan Rybak (IBS CTPU-CGA)

    Topological defects provide a powerful framework for exploring nonperturbative phenomena across high-energy physics and cosmology. In this talk, I will present a general overview of recent developments on the role of cosmic strings as probes of physics beyond the Standard Model. Particular emphasis will be placed on gravitational-wave signatures generated by cosmic string networks and their...

    Go to contribution page
  59. 13. Search for ultralight scalar dark matter with quadratic interactions
    Prof. Da Liu (Shandong University)

    In this talk, I will discuss about my recent work on the searches for the ultralight scalar dark matter with quadratic interactions with SM fields. This will lead to the effective interactions between the ultralight dark matter and the nucleon fields phi^2 N N/f below the QCD confinement scale, which can be thought as potential barrier for the dark matter wind in the presence of ordinary...

    Go to contribution page
  60. 9. Supermassive Primordial Black Holes from a Catalyzed Dark Phase Transition for Little Red Dots
    Masanori Tanaka (Peking University)

    JWST has revealed an abundant population of compact, low-metallicity Little Red Dots (LRDs) at high redshift, challenging conventional scenarios in which supermassive black holes (SMBHs) grow from stellar-mass seeds. We consider a scenario in which the SMBHs are instead supermassive primordial black holes (SMPBHs), formed directly in a decoupled, subdominant dark sector undergoing a...

    Go to contribution page
  61. 25. The Impact of String Thickness on GW Spectrum of Cosmic String Network
    Yifan Hu

    The stochastic gravitational wave background predicted by cosmic strings has attracted great attention due to its capability of explaining pulsar timing array observations. However, the vast majority of string network models concentrate on the currently observable frequency range, i.e., $10^{−9}$ Hz to $100$ Hz. Few studies focus on the ultra-high-frequency band because of current...

    Go to contribution page
  62. 3. Topics in Dark Matter Physics
    Pyungwon Ko (Korea Institute for Advanced Study)

    I will talk about a few topics in dark matter physics based on dark U(1) guauge symmetry and dark Higgs boson: (i) two-component WIMP sceario is well alive, (ii) 511 keV line in multi-component DM model, (iii) Belle-II $B^+ \rightarrow K^+ \nu \bar{\nu}$ excess from a light dark sector scenario, (iv) KM3 high energy neutrino events and gravitational wave signatures.

    Go to contribution page
  63. 18. Ultimate Quantum Precision Limit at Colliders
    Jia Liu (Peking University)

    We investigate whether collider experiments can reach the quantum limit of precision, defined by the quantum Fisher information (QFI), using only classical observables such as particle momenta. As a case study, we focus on the τ+τ− system and the decay channel τ→πν, which offers maximal spin-analyzing power and renders the decay a projective measurement. We develop a general framework to...

    Go to contribution page
  64. 14. Verifiable Origin of Neutrino Masses and Ultra High Energy Astrophysical Neutrinos
    Oleg Popov (Shenzhen MSU-BIT University)

    In this talk, we discuss the possible common origin of small neutrino masses and the source of ultra high energy astrophysical neutrinos detected in neutrino telescope experiments, such as ICECUBE and KM3NeT. This is done in the framework of the dark matter model. The correlation between neutrino mass parameters, dark matter mass, and neutrino's ultra high energy and flux are studied. The...

    Go to contribution page
  65. 63. Verifiable Origin of Neutrino Masses and Ultra High Energy Astrophysical Neutrinos
    Oleg Popov (Shenzhen MSU-BIT University)