【07.07】Seminar：Coupled Dark Energy and Dark Matter in Light of DESI
Seminar
报告题目：Coupled Dark Energy and Dark Matter in Light of DESI
报告人：王鑫, 博士后，University of Padua
主持人：周顺，研究员，中国科学院高能物理研究所
报告时间：2026年7月7日（周二），上午10:00
报告地点：高能所图书馆楼319
报告摘要：
The recent Dark Energy Spectroscopic Instrument (DESI) DR2 results show a preference for dynamical dark energy. In this talk, I will discuss a class of interacting dark energy models in which a canonical quintessence field couples to cold dark matter through a field-dependent dark matter mass. In such scenarios, the effective equation of state inferred under the assumption of non-interacting dark sectors can differ from the intrinsic scalar field equation of state, making an apparent phantom crossing possible without introducing a phantom scalar. A viable realization of this mechanism requires the effective coupling to remain sufficiently suppressed before recombination to evade cosmic microwave background constraints, while becoming strong enough at late times to reproduce the apparent phantom crossing behavior preferred by DESI. Based on analytical estimates, I will present general conditions under which these requirements can be simultaneously satisfied, together with an illustrative phenomenological realization.
个人简介：
Dr. Xin Wang is currently a postdoctoral researcher at the University of Padua. He received his Ph.D. in theoretical Physics from the Institute of High Energy Physics (IHEP), Chinese Academy of Sciences in 2022. Before joining Padua, he conducted postdoctoral research at Peking University and the University of Southampton. His main research interests lie in particle physics, cosmology and astronomy, with a focus on the origin of neutrino masses and flavour mixing and the evolution of the early Universe.
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