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The 4th Topics of Particle, Astro and Cosmo Frontiers (TOPAC 2026) 第4届粒子物理、天体物理和宇宙学前沿国际学术研讨会

16–21 Apr 2026
Asia/Shanghai timezone

Session

Plenary Theory 15: Gravitational Waves (Room 567, Chair Ye-Ling Zhou)

20 Apr 2026, 15:55

Presentation materials

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  1. 89. Search Results for Physics Beyond the Standard Model with LIGO-Virgo-KAGRA's O1-O4a Observing Runs
    Huaike Guo (University of Chinese Academy of Sciences)
    20/04/2026, 15:55

    I will discuss the recently released results on searches of physics beyond the standard model with LIGO-Virgo-KAGRA's most recent O1-O4a observing runs, including searches for cosmological first order phase transitions, cosmic strings, domain wall, primordial black holes, induced gravitational waves, and direct searches for dark matter, etc.

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  2. 35. From microphysics to Gravitational Waves for cosmological phase transitions
    Philipp Schicho (University of Geneva)
    20/04/2026, 16:20

    The possibility that future gravitational-wave detectors could observe the relic background from a cosmological phase transition has triggered intense progress in the theoretical description of these events. A detection of such a signal would probe energy scales far beyond those accessible to particle colliders, providing insight into fundamental questions about the early Universe, including...

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  3. 33. Intertwining Axion and gravitational waves, generations and detection.
    Prof. Sichun Sun (Beijing Institute of Technology)
    20/04/2026, 16:50

    Firstly, we briefly discuss how the hypothetical beyond-the-Standard-Model particle, the axion, can produce gravitational waves through several mechanisms. Then we present some of our recent proposals for detecting axions/gravitational waves, including cryogenic quantum transport technology, traditional spin systems, and specially engineered artificial magnetoelectric materials. We demonstrate...

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  4. 41. Isocurvature Induced Gravitational Waves at Pulsar Timing Arrays
    Peizhi Du (University of Science and Technology of China)
    20/04/2026, 17:15

    The standard cosmological model (ΛCDM model) assumes adiabatic initial conditions for primordial density perturbations. However, many new physics scenarios can deviate from this assumption and predict isocurvature perturbations across a large range of scales. In this talk, I will discuss interesting features of gravitational waves induced by isocurvature perturbations. I will also show that...

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  5. 151. Supercooled Dark-Sector Phase Transitions and the PTA Gravitational-Wave Signal
    Pedro Schwaller (Mainz University)
    20/04/2026, 17:40
  6. 92. How a gravitational wave background affects particle processes
    Wenyuan Ai (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
    20/04/2026, 18:05

    In one of his final papers, Steven Weinberg, together with Raphael Flauger, asked whether gravitational waves (GWs) can be attenuated through their interactions with matter. They argued that no attenuation occurs, owing to a cancellation between graviton absorption and stimulated emission, as inferred from leading-order soft-graviton arguments.

    In this talk, I revisit this reasoning and...

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