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Xiang-Xi Zeng (TDLI)12/09/2026, 16:20
Scalar-induced gravitational waves (SIGW) are one of the most promising GW sources of the early universe. The particle interactions, on the one hand, could change the equation of state $\omega$ and the sound speed $c_s$ of the cosmic fluid, such as during the QCD crossover; on the other hand, they can also contribute an anisotropic stress to the energy-momentum tensor. Recently, we have...
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Md Riajul Haque (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)12/09/2026, 16:40Oral Presentation
In this talk, I will discuss how primordial black holes (PBHs) and their associated stochastic gravitational-wave backgrounds can probe the post-inflationary Universe. I will first consider PBH formation during a non-standard reheating phase, where an enhanced primordial scalar power spectrum can simultaneously generate PBHs and scalar-induced gravitational waves. Accounting for uncertainties...
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Hailin Xu (Tsung-Dao Lee Institute)12/09/2026, 17:00Oral Presentation
Quadratically coupled ultralight scalar dark matter behaves as a coherent classical field whose interactions with matter can induce a composition-dependent force through the dark matter background. We present a complete calculation of this background-induced force beyond the spherically symmetric approximation. Using a partial-wave treatment of dark-matter scattering, we determine its angular...
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孜文 尹 (上海交通大学物理与天文学院（李政道研究所）)12/09/2026, 17:20
The orbital evolution of the Hulse-Taylor binary neutron star system is described with high precision by General Relativity, in which gravity is the only long-range force and gravitational waves provide the dominant energy-loss channel. We use this precision test of relativistic binary dynamics to derive new constraints on axion couplings to stable neutron-star constituents: neutrons,...
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