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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

Theory-Cosmology Highlight 1: Cosmological Signals (Room 567, Chair Ning-Qiang Song)

20 Apr 2026, 13:30

Presentation materials

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  1. 28. A Comprehensive Effective Field Theory Framework for Coherent Elastic Neutrino-Nucleus Scattering
    Gang Li (Sun Yat-sen University)
    20/04/2026, 13:30

    Coherent elastic neutrino-nucleus scattering (CEνNS) is critical for testing the Standard Model electroweak sector, exploring neutrino properties, and searching for new physics (NP), with recent experiments (e.g., COHERENT, CONUS+, PandaX-4T, XENONnT) highlighting the need for a systematic theoretical framework. We have constructed a comprehensive end-to-end effective field theory (EFT)...

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  2. 122. Hidden Correlations of Reionization Optical Depth in Cosmology
    Lingfeng Li
    20/04/2026, 13:55

    The reionization optical depth $\tau_{\rm reio}$ has interesting connections to existing cosmological anomalies. As first studied in the context of the Hubble tension in our previous paper, a larger $\tau_{\rm reio}$, which could be achieved by removing the Planck low-$\ell$ polarization data, could boost $H_0$ slightly, resulting in a mild reduction of the tension between the early- and...

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  3. 72. Non-Abelian Domain walls: oreo and CP violation
    Bowen Fu (Northeastern University, Shenyang)
    20/04/2026, 14:20

    The spontaneous breaking of an $A_4$ flavour symmetry can lead to the formation of domain walls. We study this phenomenon in the scenarios of real and complex $A_4$ symmetric scalar theories and discover new kinds of domain walls, which we denote as ``oreo''-type composite domain walls and CP-violating domain walls.

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