130 citations · 746 across the 33 of their papers we have counts for
5 papers · 1 filter
Photon Ring Astrometry for Superradiant Clouds
Yifan Chen, Xiao Xue, Richard Brito +1
Gravitational atoms produced from the superradiant extraction of rotational energy of spinning black holes can reach energy densities significantly higher than that of dark matter,…
Lotka-Volterra Models for Extraterrestrial Self-Replicating Probes
Yifan Chen, Jiayi Ni, Yen Chin Ong
A sufficiently advanced extraterrestrial civilization can send out a swarm of self-replicating probes for space exploration. Given the fast-growing number of such a probe, even if…
Birefringence Tomography for Axion Cloud
Yifan Chen, Chunlong Li, Yosuke Mizuno +5
An axion cloud surrounding a supermassive black hole can be naturally produced through the superradiance process. Its existence can be examined by the axion induced birefringence e…
Superradiant evolution of the shadow and photon ring of Sgr A
Yifan Chen, Rittick Roy, Sunny Vagnozzi +1
Ultralight bosons can affect the dynamics of spinning black holes (BHs) via superradiant instability, which can lead to a time evolution of the supermassive BH shadow. We study pro…
Some new results about -trinomial coefficients
Yifan Chen, Chang Xu, Xiaoxia Wang
In this paper, we present several new congruences on the -trinomial coefficients introduced by Andrews and Baxter. A new congruence on sums of central -binomial coefficients…