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Michael J. Ramsey-Musolf (Tsung-Dao Lee Institute, School of Physics and Astronomy, Shanghai Jiao Tong University)16/10/2026, 09:00
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Qing-Hong Cao (Peking University)16/10/2026, 09:25
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Jiang-Hao Yu16/10/2026, 09:50
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Xiao-Gang He16/10/2026, 10:45
We study thermal leptogenesis in three predictive type-I seesaw models in which the neutrino Dirac mass matrix is equal to the mass matrix of up-type quarks, Model A, or down-type quarks, Model B, or charged leptons, Model C. In this framework, the seesaw relation permits a full reconstruction of the heavy right-handed neutrino mass matrix from low-energy neutrino parameters, which greatly...
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Wei Chao (BNU)16/10/2026, 11:10
Leptogenesis mechanism is an elegant mechanism addressing the baryon asymmetry of the universe. In this talk, I will present recent progress of the Leptogenesis mechanism.
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Wan-Zhe Feng (Tianjin University)16/10/2026, 11:35
First-order phase transitions in hidden sectors provide a well-motivated source of stochastic gravitational waves and offer a complementary probe of physics beyond the Standard Model. In this talk, I will discuss gravitational wave production from a minimal dark U(1) sector, with emphasis on a gauge-independent formulation of the finite-temperature phase transition based on the Nielsen...
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Xiaoping Wang (Beihang University)16/10/2026, 14:00
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Prof. Bin Yan (IHEP)16/10/2026, 14:25
Spin-dependent dihadron fragmentation provides a unique way to access the polarization and spin correlations of light quarks and gluons at lepton colliders. In this talk, I will discuss how dihadron fragmentation can serve as a spin analyzer and be used to study a range of phenomena, including Bell inequality violation, anomalous electromagnetic dipole interactions, light-quark Yukawa...
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Minho Son (Korea Advanced Institute of Science and Technology)16/10/2026, 14:50
We will talk about some theoretical and phenomenological aspects of energy correlators originated from positivity.
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Wei Su (SYSU)16/10/2026, 15:15
The 2HDM+S is the singlet extension of the two-Higgs-doublet 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, as well as the direct searches of BSM Higgs In this work we performed a systematic investigation of the impacts of each mixing angle on the oblique...
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Run-Min Yao (HIAS, UCAS)16/10/2026, 16:10
Coherent axion dark matter provides a periodically time-dependent background for electromagnetic propagation. In the presence of an external magnetic field, the oscillating axion field acts as a temporal pump and can drive photon–axion conversion beyond the conventional static or adiabatic level-crossing picture. A unified Floquet and sideband description of this dynamics will be...
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Qianhang Ding (Institute for Basic Science)16/10/2026, 16:10
High-redshift binary black hole (BBH) events are promising candidates for primordial black holes (PBHs) detectable by next-generation gravitational wave (GW) detectors. A redshifted mass distribution of detected PBH candidates can be obtained from GW observations, from which the underlying PBH mass function can be reconstructed. In this work, we develop a framework that applies the...
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Andrew Cheek (TDLI, SJTU)16/10/2026, 16:10
In this talk I will discuss the dark matter science case for the future TRIDENT neutrino telescope. We have recently performed a sensitivity study for galactic dark matter annihilations and found that TRIDENT will be able to reach the thermal relic target for dark matter for masses between 1-100 TeV. We contextualized this result in the wider search for dark matter by studying a specific dark...
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Anjan Kumar Barik (TDLI)16/10/2026, 16:25
The azimuthal angle difference between the decay planes of the two tau leptons
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in $h\to\tau^+\tau^-$ probes charge-parity (CP) violation in the
Higgs-tau Yukawa coupling. In the dominant hadronic channel
$\tau^\pm\to\rho^\pm\nu$, the spin-analyzing power is suppressed by the
mixture of longitudinal and transverse $\rho$ polarizations. We propose an
energy-correlator-inspired method that... -
Yuhang Zhu (IBS-CTPU-CGA)16/10/2026, 16:25
Fermionic degrees of freedom are essential ingredients in cosmological collider physics and are well motivated by many phenomenological models beyond the Standard Model, but their signals remain largely unexplored due to the difficulty of computing loop diagrams. In this work, we ask how fermionic bubble loops contribute to cosmological collider signals and provide an exact answer for...
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Yuxuan He (City University of Hong Kong)16/10/2026, 16:25
Observations of ultra-dense substructures in strong lensing systems challenge the standard cosmological model at small scales. Self-interacting dark matter (SIDM), as an alternative to the cold
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and collisionless dark matter (CDM) of the standard cosmological model, provides a natural mechanism for forming such structures via gravothermal core collapse. We show that strong... -
Dr Jiang Zhu (TDLi institution)16/10/2026, 16:40
We studied a crucial but often oversimplified ingredient in predicting gravitational-wave signals from QCD-type phase transitions: the kinetic term of the Polyakov loop. For the first time, we derive this term from first principles in finite-temperature pure SU(3) Yang-Mills theory, incorporating a field-dependent renormalization factor—a calculation we also extend to theories with more...
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Mohamed Younes Sassi (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)16/10/2026, 16:40
We propose a new mechanism for dark matter genesis, Defect-Mediated Conversion (DMC). Cosmological domain walls–generic remnants of spontaneously broken discrete symmetries–can host a scalar condensate in their core that acts as a portal between the Standard Model and a dark sector: thermal-bath fermions crossing the wall are partially and non-thermally converted into dark particles. The...
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38. Two-loop QCD corrections to $H \to b +\bar{ b} + g at higher powers in the dimensional regulatorChinmoy Dey (Tsung-Dao Lee Institute, SJTU)16/10/2026, 16:40
We compute the two-loop massless QCD corrections to the amplitude of Higgs
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boson decay to bottom quark pair and a gluon ($H → b + \bar{b} + g$) in the higher powers of the dimensional regularization parameter $\epsilon$. The calculation is performed by projecting the amplitude onto the appropriate Lorentz structures related to the process. We also show the numerical behaviour of the form... -
Ziyang Huang (TDLI)16/10/2026, 16:55
The electroweak phase transition can affect dark-matter freeze-out by changing the particle spectrum and the reaction rates that determine its abundance. We study these effects in a two-flavour scalar framework with prescribed temperature-dependent backgrounds. We first use classical Boltzmann equations to examine how evolving masses and mixing angles modify annihilation and interconversion...
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Xinchen Li (上海交通大学李政道研究所)16/10/2026, 16:55
Light scalar particles coupled through the Higgs portal provide a connection between collider physics and the thermal history of the early Universe. In the real singlet extension of the Standard Model, these particles can modify the Higgs potential and support a first-order electroweak phase transition. Small mixing with the Higgs can also make the light scalar long-lived, leading to displaced...
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Jinhui Guo (Beihang University)16/10/2026, 16:55
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 \emph{directly} in a decoupled, subdominant dark sector undergoing a...
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Qin Yu16/10/2026, 17:10
The complex triplet extension of the Standard Model generates neutrino masses through the type-II seesaw mechanism and can alter the electroweak thermal history. In this talk, I will present an analysis based on dimensionally reduced three-dimensional effective field theories, with one-loop zero-temperature matching and two-loop thermal masses. We study two regimes distinguished by the thermal...
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Hongyi Jiang (Tsinghua University)16/10/2026, 17:10
In this talk, we studied heavy particle production from bubble collisions, and we show that by analyzing the trapping equation, the efficiency factor in the high-frequency regime behaves as $f(\chi) \propto \chi^{-4}$, a result we then generalize to $3+1$ dimensions while confirming the same power-law suppression.
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jiwei li16/10/2026, 17:10
We investigate how thermal resummation affects electroweak phase transitions and the associated gravitational wave predictions in conformal and non-conformal two-Higgs-doublet models. We adopt partial dressing for the scalar thermal sector, describe its multi field implementation used in our 2HDM scans, and compare its predictions with those of the Parwani and Arnold–Espinosa prescriptions at...
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Xiyuan Jin (TDLI)16/10/2026, 17:25
We present a perturbative gauge-invariant calculation of the thermal bubble nucleation rate and gravitational-wave(GW) relevant parameters for a one-step first-order phase transition in the real-triplet Standard Model extension ($\Sigma$SM). Using the gauge-invariant high-temperature nucleation rate framework of \cite{Lofgren:2023}(we here call it 4D method) and the more consistent treatment...
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minmin Niu16/10/2026, 17:25
We study nonadiabatic leptogenesis in a B-L Higgs portal scalegenesis framework which undergoes a strong supercooling cosmological phase transition of Coleman-Weinberg type. For the benchmark considered, we discuss a 10 TeV B-L breaking scenario and its phenomenological consequences at LHC versus consistency with success of the present nonperturbative leptogenesis.
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Yaoduo Wang (TDLI)16/10/2026, 17:25
We investigate non-thermal particle production during first-order phase transitions in the presence of ultra-relativistic thick bubble walls with non-trivial internal structure. Extending the framework of bubble-expansion particle production, we consider bubble walls containing multiple ripples and study how such spatial modulations affect the production of heavy particles coupled to the order...
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Haipeng An (Tsinghua University)17/10/2026, 09:00
I will discuss a new model for the origin of the thermal big bang expansion of our Universe. We assume that after inflation, the inflaton field released all its energy into a dark sector, and the standard model sector was stuck in a meta stable vacuum. Then one day, when the Hubble expansion rate becomes small enough, the vacuum decay process in the SM sector complete, and after...
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Ryusuke Jinno (RESCEU, The University of Tokyo)17/10/2026, 09:25
We discuss the unique phenomenology of first-order phase transitions catalyzed by primordial black holes (BHs). If the number of BHs within one Hubble volume is smaller than unity at the time of bubble nucleation, each bubble catalyzed around them can expand to the Hubble size, and the universe is eventually filled with true vacuum much after nucleation. This super-slow transition predicts...
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Wenyuan Ai (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)17/10/2026, 09:50
I will give a brief review on cosmological first-order phase transitions and discuss the possibility of primordial black hole formation from them.
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Zhi-Wei Wang (UESTC)17/10/2026, 10:45
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Kohei Kamada (HIAS UCAS)17/10/2026, 11:10
Vacuum decay is one of the hottest topics in cosmology and particle physics, because now it is one of the promising phenomena to generate detectable gravitational wave background.
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Recently there is a claim that a small black hole may catalyze the vacuum decay to enhance its rate extremely, which can change the several scenarios of the cosmological phase transitions.
Cosmological scenarios... -
Yuichiro Nakai17/10/2026, 11:35
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Prof. Shao-Feng Ge (TDLI-SJTU)17/10/2026, 14:00
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Yongchao Zhang (Southeast University)17/10/2026, 14:25
The non-standard self-interactions of neutrinos can be induced by (light) neutrinophilic scalars $\phi$. The couplings of these scalars are tightly constrained by the precision muon measurements, in association with other electroweak data. The most stringent muon limits are on the $\phi$-induced 2-loop decay $\mu \to e \gamma$, the 1-loop $\phi$ correction to standard model muon decay and the...
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Dr Qin Qin (Huazhong University of Science and Technology)17/10/2026, 14:50
We discuss the theoretical aspects of CP violation in beauty baryon decays, emphasizing what the baryon sector can teach us beyond the meson sector.
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Xiao-Dong Ma (South China Normal Uni.)17/10/2026, 15:15
In the talk, I will summarize our recent works on the study of baryon-number-violating nucleon decay modes, either with or without a new light particle in the final state. In light of the current and upcoming neutrino expriments, a solid theoretical description of all possible kinematically allowed decay modes is urgent. We work within the low energy effective field theory (LEFT) plus chiral...
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Haolin Li (Sun Yat-Sen University)17/10/2026, 16:10
The infrared structure of gauge theories with chiral fermions remains largely unexplored. In this work we investigate the Bars-Yankielowicz class using the functional renormalisation group, building on recent developments in gauge-fermion systems that provide clear criteria for confinement and dynamical symmetry breaking. We show that two distinct phases arise: one exhibiting both confinement...
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Ningqiang Song (Institute of Theoretical Physics, Chinese Academy of Sciences)17/10/2026, 16:35
Constraints on axions from neutrino experiments
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Guanhao Sun (Chongqing University)17/10/2026, 17:00
Effective field theory connects the dynamics of the early universe to observable correlations, with symmetries constraining the allowed interactions and their predictions. I will discuss how this description is established for the in-in formalism used to calculate cosmological correlators. I will then apply this perspective to a quasi-single-field model in de Sitter space, constructing the...
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Takumi Kuwahara (Jilin U)17/10/2026, 17:25
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...
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Peizhi Du (University of Science and Technology of China)18/10/2026, 09:00
Scalar induced gravitational waves (SIGW) are a powerful probe of dynamics in the Standard Model and BSM models in the early Universe. In particular, the equation of state and sound speed have non-trivial time dependence during phase transitions, which will impact the spectrum of induced GWs. In this talk, I will present a detailed calculation of SIGW in a general time-dependent thermal bath....
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阳 张 (河南师范大学)18/10/2026, 09:25
PTagent is a backend-supported LLM agent skill for constructing scalar effective potentials used in cosmological phase-transition calculations. It organizes model-dependent terms, conventions, resummation prescriptions, and unresolved choices into a reviewable physics contract. Then the backend deterministically translates the contract into executable CosmoTransitions or PhaseTracer code....
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Peter Athron (Nanjing Normal University)18/10/2026, 09:50
TransitionSolver and PhaseTracer are software packages for first order cosmological phase transitions that provide an end-to-end calculation from the effective potential to gravitational wave signals. These calculations have many subtleties and every step contains significant challenges and/or open questions that are still actively investigated. In this talk I will describe these steps and...
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Yue Zhao (HKUST)18/10/2026, 10:45
This talk will explore how exciting gravitational-wave interferometers can serve as powerful probes of new physics. For ultralight dark matter candidates, I will demonstrate how the similar search strategy enables the direct detection of multiple candidates, including dark photons, axions, and dilatons. These analyses illustrate how these newly developed GW frontiers can be repurposed as...
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驰 田 (安徽大学)18/10/2026, 11:10
Ultralight bosons emerge naturally in various beyond the Standard Model scenarios and are well-motivated dark matter candidates. If such particles exist, rapidly spinning black holes with sizes comparable to the boson’s Compton wavelength would become superradiantly unstable, forming an oscillating cloud that spins down the black hole.
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We consider an extended, superradiance-informed spin... -
Chen Zhang (Northeastern University (China))18/10/2026, 11:35
Magnetic monopoles arise generically in unified theories and offer a natural explanation of charge quantization. Beyond collider searches and cosmic-ray experiments, their flux is constrained by Parker-type bounds requiring galactic magnetic fields to survive monopole energy extraction. We formulate a self-consistent Parker bound anchored in the lowest eigenmode of the galactic mean-field...
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镇 张 (中国科学院高能物理研究所)18/10/2026, 14:00
Double parton scattering (DPS) corresponds to events where two parton-parton scatterings occur in a single hadron-hadron collision. The DPS effects may arise from the spectator scatterings that are somewhat related to semi-hard QCD activities. In this work, we investigate the DPS effects on the $W$-boson mass measurements. Especially, our analysis reveals that the DPS effects contribute...
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Hong-Bo Jin (NAOC)18/10/2026, 14:25
Gravitational Quantum Field Theory (GQFT) has been proposed as a candidate framework to reconcile general relativity with quantum field theory, and a distinctive imprint on gravitational-wave (GW) polarizations is crucially predicted. While general relativity allows only two tensor modes ($+, \times$), GQFT additionally favors a massless breathing scalar mode, providing a compelling yet...
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Tao Xu18/10/2026, 14:50
The present-day dark matter abundance may include a population of compact dark objects, which have historically been constrained through dynamical probes of their gravitational interactions with baryonic systems. Astronomical binaries are emerging as precision laboratories for probing dark matter over a wide range of masses. In this talk, I will introduce few-body scattering processes...
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Dr Yu-Cheng Qiu (City University of Hong Kong)18/10/2026, 15:45
The quality of the QCD axion can be protected by a gauge symmetry.
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This work considers a gauged chiral $U(1)_{B-L}$. The vacuum expectation values of two complex scalars break $U(1)_{B-L}$. One linear combination of their two phase degrees of freedom is eaten by the $U(1)_{B-L}$ gauge boson, while the other becomes the QCD axion. Since the PQ symmetry is accidental, there is no ambiguity in... -
Dr Xiao Wang (Monash University)18/10/2026, 16:10
Gravitational waves from cosmological first-order phase transitions provide a powerful probe of early-Universe physics. While existing semi-analytical models generally predict that cosmic expansion modestly suppresses the resulting gravitational-wave signal, we demonstrate that this expectation is qualitatively reversed for slow transitions. Using the first three-dimensional hydrodynamical...
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Dr CRISTIAN FELIPE SIERRA FONSECA (Tsung-Dao Lee Institute)18/10/2026, 16:35
The recent observation of CP violation in the decay $\Lambda_b^0\to\,pK^{-}\pi^{+}\pi^{-}$ by the LHCb collaboration, with a significance of 5.2 standard deviations, presents a unique
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opportunity to probe physics beyond the Standard Model. While the measured
asymmetry of (2.45 $\pm$ 0.46)$\%$ is consistent with some hadronic mechanisms within
the Standard Model, its resonant substructure...
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