This week we will have Yan Shenfeng (鄢盛丰) to present his recent work (arxiv: 1909.06388), at 7PM Nov. 5 (Tuesday) in the 19th-floor Observatory Hall.

Title: Interpreting cosmological tensions from the effective field theory of torsional gravity

Abstract: Cosmological tensions can arise within ΛCDM scenario amongst different observational windows, such as measurements of the H0 and σ8 parameters. These tensions, if finally confirmed by measurements, may indicate new physics beyond the standard paradigm. In this paper, we report how to alleviate both the H0 and σ8 tensions simultaneously within torsional gravity from the perspective of effective field theory (EFT). We apply the EFT approach, which allows to investigate the evolution equations at the background and perturbation levels in a systematic way, and examine the conditions followed by the coefficients of various possibly involved operators such that cosmological tensions can be relaxed. Following these observations we construct concrete models of Lagrangians of torsional gravity.

You are welcome to join the discussion. We will provide snacks and drinks.