| Speaker: | Bum-Hoon Lee (Center for Quantum SpaceTime, Sogang University) |
|---|---|
| Title: | Early Dark Energy model as a common ground for Cosmic Birefringence and the Hubble Tension |
| Date (JST): | Wed, Jan 29, 2025, 15:30 - 17:00 |
| Place: | Seminar Room A |
| Abstract: | Recent observations such as H0 and cosmic birefringence among others are challenging the Standard cosmological model of ΛCDM. We introduce the Ultralight Axion-like model of Early Dark Energy (EDE). With the potential of n=3 we work the observations of the EB mode of the cosmic microwave background (CMB) radiation, and local expansion rate measurements. Our results show that the shape of the CMB EB angular power spectrum is sensitive to the background cosmological parameters. We find that the EDE model with n=3 can provide a good fit to the observed CMB EB spectra, consistent with the locally measured value of the Hubble constant. Our result is the first to show that axion-like EDE can provide a unified explanation for the observed cosmic birefringence and the Hubble tension. |
