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The 2026 Zhuhai Particle Physics and Cosmology Symposium (ZPCS 2026): Early Universe, Phase Transitions and Fundamental Symmetries

15–19 Oct 2026
Asia/Shanghai timezone

Session

Parallel Talks (1)

16 Oct 2026, 16:10

Presentation materials

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  1. 20. TRIDENT's prospects for thermal relics
    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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  2. 48. Probing Collapsed Dark Matter Halos with Fast Radio Bursts
    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
    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...

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  3. 5. Defect-Mediated Conversion: Dark Matter from Cosmological Domain-Wall Scattering
    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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  4. 40. Supermassive Primordial Black Holes from a Catalyzed Dark Phase Transition for Little Red Dots
    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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  5. 59. Thermal Resummation Effects on Electroweak Phase Transitions and Gravitational Waves in Conformal and Non-Conformal 2HDMs
    jiwei li
    16/10/2026, 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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  6. 25. gauge- invariant bubble nucleation rate in real triplet extension of standard model
    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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