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Chengfeng Cai (Sun Yat-sen University)19/04/2026, 16:30
Leptophilic dark matter offers a well-motivated framework in which conventional nuclear-recoil limits can be strongly suppressed, while viable parameter space remains testable through astrophysical observations. In this talk, I will present a study of scalar leptophilic dark matter in a gauged $\mathrm{U(1)}_{L_\mu-L_\tau}$ extension of the Standard Model, including secluded and...
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Hong-Yi Zhang19/04/2026, 16:55
Ultralight dark photons can form stable, compact clumps that possess macroscopic coherence, called solitons. When two such solitons collide and merge, the merged object can suddenly convert its stored dark-sector energy into ordinary radio photons through a process called parametric resonance. The merger rate scales steeply with local soliton number density (merger rate ∝ density²), so regions...
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Chen Sun (ICTP, Trieste)19/04/2026, 17:10
Many well-motivated UV theories contain bonsonic light degrees of freedom, which can exhibit various wave-like behaviors at low energy. This leads to many new ideas and novel observables in recent years to probe new physics in astrophysical and laboratory setups alike. In this talk, I will briefly review a few examples in leveraging the wave-like features to test axions and ultralight dark...
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Dr Jiang Zhu (TDLi institution)19/04/2026, 17:25
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)19/04/2026, 17:40
Extended Higgs sectors such as the 2HDM and N2HDM provide new discrete symmetries, which, upon spontaneous symmetry breaking, can lead to the formation of topological defects called domain walls. In this talk, I discuss some consequences of these domain walls on the early universe, such as electroweak symmetry restoration necessary for Electroweak baryogenesis via domain walls, as well as the...
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Aidi Yang19/04/2026, 17:55
We investigate the capability of TianQin and LISA to reconstruct the model parameters in
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the Lagrangian of new physics scenarios that can generate an electroweak SFOPT. Taking the dimension-six Higgs operator extension of the Standard Model as a representative scenario for a broad class of new physics models, we establish the mapping between the model parameter Λ and the observable spectral... -
Tingyu Li (Tsinghua University)19/04/2026, 18:10
Inspired by string theory and cosmological constant problem, it is plausible that the Universe’s vacuum structure is characterized by a landscape of metastable vacua. If the dark vacuum is metastable, bubbles of lower-energy phases can nucleate at an approximately constant rate. Because the Hubble expansion rate is monotonically non-increasing with cosmic time, such nucleation can eventually...
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Haibin Chen19/04/2026, 18:25
Supercooled phase transitions have attracted significant interest as potential sources of strong, low-frequency gravitational wave signals detectable by Pulsar Timing Arrays (PTAs). A nucleation temperature $T_n$ is often used to characterize the onset of the transition, defined by a threshold on the nucleation rate. However, in the regime of ultra-low nucleation rates, $T_n$ may not exist,...
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