3 papers
gr-qc2026
Theoretical and observational constraints on early dark energy in gravity
Hua Chen, Taishi Katsuragawa, Shin'ichi Nojiri +1
This work examines an early dark energy (EDE) scenario in the context of gravity. EDE is introduced to alleviate the Hubble tension by temporarily injecting approximately $1…
astro-ph.CO2025
Parity violation in framework of nonmetricity gravity
Zhiyuan Yu, Zhengsheng Yang, Taotao Qiu
The latest observational data of Planck satellite shows nontrivial value of polarization rotation angle caused by cosmic birefringence in the early universe. Moreover, the asymmetr…
gr-qc2025
Dynamics of Spinning Test Body in quadratic Einstein-Cartan Theory and its Free-fall Test
Kun Hu, Zhiyuan Yu, Taotao Qiu +1
We study the dynamics of the non-relativistic spinning test body (STB) in the framework of Einstein-Cartan theory(ECT), in which the weak equivalence principle is violated by the s…