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Testing the equivalence principle via the shadow of black holes
Chunlong Li, Sheng-Feng Yan, Lingqin Xue +5
We study the equivalence principle, regarded as the cornerstone of general relativity, by analyzing the deformation observable of black hole shadows. Such deformation can arise fro…
Interpreting cosmological tensions from the effective field theory of torsional gravity
Sheng-Feng Yan, Pierre Zhang, Jie-Wen Chen +3
Cosmological tensions can arise within CDM scenario amongst different observational windows, which may indicate new physics beyond the standard paradigm if confirmed by measurem…
Primordial black holes from sound speed resonance in the inflaton-curvaton mixed scenario
Chao Chen, Yi-Fu Cai
We study sound speed resonance (SSR) mechanism for primordial black hole (PBH) formation in an early universe scenario with inflaton and curvaton being mixed. In this scenario, the…
GRID: a Student Project to Monitor the Transient Gamma-Ray Sky in the Multi-Messenger Astronomy Era
Jiaxing Wen, Xiangyun Long, Xutao Zheng +139
The Gamma-Ray Integrated Detectors (GRID) is a space mission concept dedicated to monitoring the transient gamma-ray sky in the energy range from 10 keV to 2 MeV using scintillatio…
New test on general relativity and torsional gravity from galaxy-galaxy weak lensing surveys
Zhaoting Chen, Wentao Luo, Yi-Fu Cai +1
We use galaxy-galaxy weak lensing data to perform a novel test on general relativity (GR) and torsional gravity. In particular, we impose strong constraints using the torsio…
Model-independent reconstruction of gravity from Gaussian Processes
Yi-Fu Cai, Martiros Khurshudyan, Emmanuel N. Saridakis
We apply Gaussian processes and Hubble function data in cosmology, to reconstruct for the first time the form in a model-independent way. In particular, using …