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Monday, 20 October 2025, 14:30 in P8445B
Dr. Meng-Xiang Lin (SFU)
Cosmological tensions and interactions between dark matter and dark energy
The nature of dark matter and dark energy remains one of the most profound mysteries in modern cosmology. In addition to these theoretical challenges, recent cosmological observations have revealed potential signs of new physics beyond the standard ΛCDM paradigm. In this talk, I will begin by briefly reviewing current cosmological tensions, including the latest DESI evidence for dynamical dark energy, the Hubble tension, and the S8 tension. I will then explore possible new physics underlying these tensions, with a particular focus on interactions between dark matter and dark energy. I will demonstrate that a simple coupling between the two components can simultaneously address two distinct anomalies: the DESI-indicated dynamical dark energy and the S8 tension. We propose a stable and technically natural particle physics realization of this idea, which exhibits an apparent phantom crossing behavior in the dark energy equation of state, consistent with DESI findings. The possible resolutions to the Hubble tension will also be discussed.
Upcoming Seminars:
2025-12-01 14:30 in P8445B - Kevork Abazajian (UC Irvine): Successes and challenges in neutrino cosmology and structure formation
Past Seminars:
2025-11-24 15:30 in P8445B - Gopolang Mohlabeng (SFU): Searching for light accelerated dark matter 2025-11-17 14:30 in P8445B - Afif Omar (UVic): Probing Hadronic Dark Matter Annihilation with Big Bang Nucleosynthesis 2025-11-10 14:30 in P8445B - Qinrui Liu (SFU): High-energy cosmic neutrinos: A unique window to the universe 2025-10-27 14:30 in SSB7109 - Levon Pogosian (SFU): A theorist's perspective on cosmological tensions 2025-10-20 14:30 in P8445B - Meng-Xiang Lin (SFU): Cosmological tensions and interactions between dark matter and dark energy 2025-10-10 14:30 in AQ3149 - Francis Halzen (University of Wisconsin-Madison): IceCube: The first decade of neutrino astronomy (physics colloquium)
[ See complete seminar archives | iCal feed ]
Modified by Andrei Frolov <frolov@sfu.ca> on 2025-11-24