354 citations · 2.4k across the 53 of their papers we have counts for
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astro-ph.CO2015★ 44 cited
Is the Universe Transparent?
Kai Liao, A. Avgoustidis, Zhengxiang Li
We present our study on cosmic opacity, which relates to changes in photon number as photons travel from the source to the observer. Cosmic opacity may be caused by absorption/scat…
astro-ph.CO2015★ 90 cited
The Distance Duality Relation from Strong Gravitational Lensing
Kai Liao, Zhengxiang Li, Shuo Cao +3
Under very general assumptions of metric theory of spacetime, photons traveling along null geodesics and photon number conservation, two observable concepts of cosmic distance, i.e…