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The nature of dark matter and dark energy remains one of the most profound mysteries in modern physics. In addition to these longstanding theoretical challenges, recent cosmological observations have revealed potential signs of new physics beyond the standard LCDM paradigm. In this talk, I will begin with a brief overview of current cosmological tensions, including the latest DESI evidence for dynamical dark energy and the longstanding Hubble tension. I will then discuss possible new physics underlying these anomalies, focusing in particular on interactions between dark matter and dark energy.
I will present a stable and technically natural particle-physics realization of this scenario through interactions between dark baryons and dark axions. The model exhibits an apparent phantom-crossing behavior in the dark energy equation of state, consistent with the latest DESI observations, while also offering a possible resolution to the Hubble tension. Fits to current cosmological datasets show evidence for nonzero interactions in the dark sector.
Bio: Dr. Meng-Xiang Lin is currently a CITA National Fellow at Simon Fraser University. Prior to that, he completed his undergraduate studies at Peking University and earned his Ph.D. from the University of Chicago, then join University of Pennsylvania as Postdoctoral Fellow at the Center for Particle Cosmology. His research interests span a broad range of topics in theoretical cosmology, with a particular focus on uncovering possible new physics behind current cosmological tensions and using gravitational waves as a probe of fundamental physics. More information can be found on his personal website: https://m-x-lin.github.io/index.html
Prof. Jia liu