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Prof. Fuminobu Takahashi (Tohoku University)25/08/2025, 09:00
We study the evolution of topological defects in multi-axion models and propose a novel solution to the domain wall problem of the QCD axion.
Multi-axion dynamics, arising from multiple Peccei–Quinn scalars, can lead to qualitatively different defect evolution compared to single-axion models. In particular, networks of cosmic strings and high-tension domain walls tend to form, posing a...
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Lei Wu25/08/2025, 09:30
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Lingfeng Li25/08/2025, 10:30
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Chen Sun25/08/2025, 11:00
It is well-known that axions and photons can coherently convert into each other in a background magnetic field, a phenomenon commonly observed in a mixed two-level quantum system such as neutrino oscillations and nuclear spin processions. Similar to the nuclear magnetic resonance and spin flips in a qubit system, we point out that an periodic (in time or space) background magnetic field can...
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Naoya Kitajima25/08/2025, 11:30
Cosmic string is a topological defect associated with the spontaneous symmetry breaking in the early universe. After the formation of cosmic strings, they form a network and evolve following the scaling regime. In this talk, I present light particle emissions from the cosmic string network. In particular, I focus on the procudtion of the axion and other pseudo-Nambu-Goldstone bosons and show...
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Ariel Arza (Nanjing Normal University)25/08/2025, 13:30
The interplay between wave-like dark matter and Earth’s conductive properties generates a global monochromatic magnetic field. Simple experimental setups, such as those pioneered by the SNIPE Hunt collaboration, have already demonstrated the feasibility of probing axion-like particles and dark photons. Beyond these candidates, this approach can also be extended to ultralight dark matter...
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Mr Borui Zhang (Tsinghua University)25/08/2025, 13:50
The James Webb Space Telescope (JWST) observations have identified a class of compact galaxies at high redshifts (4 \lesssim z \lesssim 11), dubbed "little red dots" (LRDs). The supermassive black holes (SMBHs) of 10^{5-8}{\rm\,M}_{\odot} in LRDs favor a heavy-seed origin. We propose a mechanism for their formation: Clusters of primordial black holes, formed through long-short mode coupling on...
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Wei Su (SYSU)25/08/2025, 14:10
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Mr Shota Nakagawa (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)25/08/2025, 14:30
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...
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Yun-Long Zhang (NAOC)25/08/2025, 14:50
Axions and axion-like particles can be probed through gravitational waves indirectly, often referred to as “audible axions”. The usual concept of audible axion relies on the coupling between the axions and the gauge fields. Here we consider an axion-like mechanism with coupling to the Nieh–Yan term. This interaction leads to the direct and efficient production of gravitational waves during the...
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Junseok Lee (Tohoku U.)25/08/2025, 15:40
We show that heavy axion domain walls induce domain walls of the QCD axion through a mixing between the heavy axion and the QCD axion, even when the pre-inflationary initial condition is assumed for the QCD axion. The induced domain walls arise because the effective θ parameter changes across the heavy axion domain walls, shifting the potential minimum of the QCD axion. When the heavy axion...
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Yuxuan Hao (TDLI)25/08/2025, 16:00
We explore the interplay of the post-inflationary QCD axion and a light scalar field for the axion domain wall decay and dark matter (DM).
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The interaction between the scalar field and the axion effectively serves as an explicit Peccei-Quinn (PQ) violating term. At a temperature below the PQ phase transition, the effective PQ violating interaction generates the axion potential which generally... -
Shihwen Hor (TDLI)25/08/2025, 16:20
White dwarfs offer a compelling avenue for probing interactions of dark matter particles, particularly in the challenging sub-GeV mass regime. The constraints derived from these celestial objects strongly depend on the existence of high dark matter densities in the corresponding regions of the Universe, where white dwarfs are observed. This implies that excluding the parameter space using...
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Yoshiki Uchida (South China Normal University)25/08/2025, 16:40
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 a role of a source of heavy scalar particles whose $CP$-violating decay into quarks and...
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Shi Pi26/08/2025, 09:30
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Fapeng Huang26/08/2025, 10:30
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Kohei Kamada (HIAS UCAS)26/08/2025, 11:00
In the context of axion inflation, inflaton can couple to gauge fields through the Chern-Simons coupling. This coupling gives rise to an instability of helical U(1) gauge fields. If the B-L symmetry in the Standard Model is gauged, at the end of inflation through the chiral anomaly we have helical B-L magnetic fields and B-L asymmetry in the visible and sterile sector, while the total B-L...
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Natsumi Nagata26/08/2025, 11:30
We investigate the prospects of probing weak-scale higgsinos through electroweak precision measurements at a future $e^+ e^-$ collider. In the Minimal Supersymmetric Standard Model, higgsinos mix with winos and binos after electroweak symmetry breaking, forming charginos and neutralinos. These states contribute to electroweak precision observables, which can be measured with high accuracy at...
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Zhonglv Huang (TDLI)26/08/2025, 13:30
We investigate phenomenological implications of vector bosons $V$ transforming as (1, 2, -3/2) under the standard model (SM) product gauge group $SU(3)_C$, $SU(2)_L$ and $U(1)_Y$. These vector bosons can couple to two SM leptons at tree-level forming dimension-4 operators. These operators dictate $V$ to have two units of global lepton number, $\Delta L = 2$. The operators generated conserve...
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Baihong Zhou (TDLI, SJTU)26/08/2025, 13:50
Quantum entanglement is a hallmark feature of quantum mechanics, manifesting as correlations between subsystems that cannot be fully described without one another, regardless of spatial separation. While entanglement has been observed in processes such as $pp\to t \bar{t}$ and thoroughly analyzed in Higgs decay channels ($H\to VV$) at the Large Hadron Collider (LHC), it remains comparatively...
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Takaaki Nomura (Sichuan University)26/08/2025, 14:10
In this talk, we discuss triple $Z'$ boson signals via the decay chain of $Z \to Z' \phi \to Z' Z' Z'$, with a new light scalar $\phi$, at future Z factories such as CEPC and FCC-ee. These new bosons $\phi$ and $Z'$ naturally appear in models with a new $U(1)$ gauge symmetry which is spontaneously broken and introduced in various new physics scenarios. The branching ratio of $Z \to Z' \phi \to...
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Yufei Zhang26/08/2025, 14:30
Axion-like particles can couple to Standard Model gluons, electroweak gauge bosons, and massive fermions. A future multi-TeV muon collider provides a favorable environment to probe axion-like particles through multiple production channels, including vector boson fusion via electroweak gauge boson couplings and the top-associated production mediated by direct fermionic couplings. Motivated by...
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Wei-Xiang Feng26/08/2025, 15:40
The gravothermal core collapse of self-interacting dark matter halos provides a compelling mechanism for seeding supermassive black holes in the early Universe. In this scenario, a small fraction of a halo, approximately $1\%$ of its mass, collapses into a dense core, which could further evolve into a black hole. We demonstrate that this process can account for the origin of JWST little red...
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Cheng Li (Sun-Yat-Sen University)26/08/2025, 16:00
The 2HDM+S is the singlet extension of the Two-Higgs-Doublets Model (2HDM). The singlet field and its mixing with the 2HDM Higgs sector lead to new contributions to the electroweak precision observables, in particular, the oblique parameters. In this paper, we identify five benchmark cases, where at most one mixing angle is nonzero and analyze the 95\% C.L. allowed parameter space by the...
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Junxuan Xu (TDLI)26/08/2025, 16:20
We present a new framework of grand unification that is equipped with an axion solution to the strong CP problem without a domain wall problem when the Peccei–Quinn (PQ) symmetry is spontaneously broken after inflation. Our grand unified theory (GUT) is based on a symmetry breaking pattern, SU(10) ×SU(5)1 →SU(5)V ⊃SU(3)C ×SU(2)L ×U(1)Y, where SU(5)1 and a special embedding of SU(5)2 ⊂SU(10)...
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Prof. Junmou Chen (Jinan University)26/08/2025, 16:40
Based on the general principles of Lorentz symmetry and unitary, we introduce two consistency conditions -- on-shell gauge symmetry and strong massive-massless continuation -- in constructing amplitudes of massive gauge theory with elementary particles. Combined with the little group transformation and consistent factorization, we construct 3-point and 4-point vector boson/scalar...
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Ye-Ling Zhou (HIAS-UCAS)27/08/2025, 09:00
Asymptotic unification, distinct from the conventional concept of unification, suggests that couplings unify at a non-trivial ultraviolet (UV) fixed point. Theory with an interacting UV fixed point is normally referred to as asymptotic safety to address the famous UV Landau pole problem. Alternative to a usual grand unified theory (GUT), an asymptotic GUT gradually unifies gauge couplings in...
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Masanori Tanaka (Peking University)27/08/2025, 09:30
In this presentation, we discuss a relation between the dynamics of the ElectroWeak Phase Transition (EWPT) and the entanglement entropy defined in scattering processes. As a representative scenario, we focus on the SM extension with N singlet scalar fields with the global O(N) symmetry. We also discuss a possibility that the entanglement entropy may be used as an order parameter for the EWPT....
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Hajime Otsuka (Kyushu University)27/08/2025, 10:00
Selection rules are fundamental principles in quantum systems and quantum field theory, determining whether certain couplings are allowed or forbidden. Conventionally, selection rules are associated with conservation laws originating from a certain group-like symmetry. However, it has been found that non-invertible selection rules also appear in quantum field theory and string theory. In this...
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Mr Fangchao Liu (TDLI, SJTU)27/08/2025, 11:00
The strong CP problem remains one of the most significant unresolved issues in the Standard Model. A promising approach is to assume that CP is an exact symmetry of the Lagrangian, broken spontaneously by the vacuum. Supersymmetry (SUSY) provides a natural framework for such scenario, offering both protection of hierarchies and flat directions where spontaneous CP violation (SCPV) can occur....
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Sudhakantha Girmohanta (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)27/08/2025, 11:20
If the nano-Hz gravitational wave signal observed by Pulsar Timing Array (PTA) experiments originates from a strongly supercooled first-order phase transition, the resulting supercooling at ${\cal O}(1)$ GeV temperature necessitates a new mechanism for generating the baryon asymmetry and dark matter, as any pre-existing abundances are diluted. We propose a model of cold darkogenesis, where the...
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Zhihao Zhang (TDLI)27/08/2025, 11:40
A supercooled phase transition in a nearly conformal dark sector can provide a natural setting for darkogenesis via its out-of-equilibrium dynamics, where a particle-antiparticle number asymmetry in the dark sector can be reprocessed into the visible sector, yielding the observed baryon asymmetry and an asymmetric dark matter. We consider a scenario where the number asymmetry is generated from...
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Oleg Popov (Shenzhen MSU-BIT University)27/08/2025, 12:00
The present talk will cover an extension of a scotogenic and its modular $\mathcal{A}_4$ variation a step forward and demonstrates scotogenic modular $\mathcal{A}_4$ non-supersymmetric realization. To achieve this non-holomorphic modular symmetries come to rescue. Advantage of the current construction is the compactness of the model content and absence of the supersymmetric fields. Neutrino...
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Chen Sun (ICTP, Trieste)
It is well-known that axions and photons can coherently convert into each other in a background magnetic field, a phenomenon commonly observed in a mixed two-level quantum system such as neutrino oscillations and nuclear spin processions. Similar to the nuclear magnetic resonance and spin flips in a qubit system, we point out that an periodic (in time or space) background magnetic field can...
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Prof. Bin Yan (IHEP)
Spin correlations between particles produced at colliders provide valuable insights for quantum information studies. While traditional studies of quantum information at colliders are typically limited to massive particles with perturbative decay, we propose an innovative method to explore the Bell inequality in massless quark pair systems by analyzing the azimuthal correlations in $\pi^+\pi^-$...
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Ligong Bian
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Naoya Kitajima (Tohoku University)
Cosmic string is a topological defect associated with the spontaneous symmetry breaking in the early universe. After the formation of cosmic strings, they form a network and evolve following the scaling regime. In this talk, I present light particle emissions from the cosmic string network. In particular, I focus on the procudtion of the axion and other pseudo-Nambu-Goldstone bosons and show...
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86. One-loop analysis of dark matter constraints in a complex scalar extension of the Standard ModelChikako Idegawa (Sun Yat-sen University)
We investigate the complex singlet extension of the Standard Model, which provides a pseudo-Nambu-Goldstone dark matter candidate. In addition to the latest and most stringent bounds from dark matter direct detection experiment, we impose the observed DM relic abundance and a novel condition that the imaginary component of the singlet field does not develop a vacuum expectation value, ensuring...
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