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Abstract：
Exciting clues to isotropic cosmic birefringence have recently been detected in the EB cross-power spectra of the polarization data of the cosmic microwave background (CMB). Early Dark Energy (EDE) models with a pseudoscalar field coupled to photons via a Chern-Simons term can be used to explain this phenomenon, and can also potentially be used to simultaneously resolve the H0 tension. In this work we incorporate an early dark energy scalar field, including a Chern-Simons coupling, into an existing Boltzmann solver and numerically recover the EB cross-power spectrum for two models in the literature; the α-attractor, and the Rock ‘n’ Roll field. We find that both the models fit the EB spectra, and the EB spectra alone do not possess sufficient constraining power to distinguish the two models based on current data.
Biography:
Lu Yin is an Associate Professor at Shanghai University. She completed her Ph.D. (2016-2020) from the National Tsing Hua University. She worked as a postdoctoral researcher at the Center for Quantum SpaceTime (CQUeST) and was a Young Scientist Training Program Fellow at the Asia Pacific Center for Theoretical Physics (APCTP) in South Korea. Her research focuses on Theoretical Cosmology with topics about Gravitational Wave physics, Cosmic Birefringence, Modified Gravity, Dark Energy models and Anisotropic Universe.
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