53 citations · 151 across the 24 of their papers we have counts for
24 papers
Long-term 3+1 simulations of primordial black hole formation during radiation domination
Zhuan Ning, Rong-Gen Cai, Shao-Jiang Wang +1
We develop an efficient three-dimensional numerical-relativity framework for primordial black-hole (PBH) formation from superhorizon curvature perturbations in a radiation-dominate…
The Hubble tension: A decade review
Rong-Gen Cai, Shao-Jiang Wang
Ever since the new millennium, precision cosmology has forged the -cold-dark-matter (CDM) model as the standard model of concordant cosmology, withstanding various tests exce…
Primordial black hole formation in bulk-viscous cosmology
Zi-Yan Yuwen, Cristian Joana, Shao-Jiang Wang +1
We investigate primordial black hole (PBH) formation in a cosmological background with bulk viscosity. Using numerical simulations, we determine the collapse threshold and the resu…
Nonminimally coupled quintessence with sign-switching interaction
Jia-Qi Wang, Rong-Gen Cai, Zong-Kuan Guo +3
We propose a new nonminimally coupled quintessence model to account for the late-time dark energy dynamics indicated by recent Dark Energy Spectroscopic Instrument (DESI) measureme…
Vacuum bubbles from cosmic ripples
Zi-Yan Yuwen, Rong-Gen Cai, Shao-Jiang Wang
We investigate vacuum decays in the early Universe in the presence of curvature perturbations. For sufficiently large perturbations associated with over-densities, we find that the…
Thermodynamics of Kerr-Bertotti-Robinson black hole
Li Hu, Rong-Gen Cai, Shao-Jiang Wang
We investigate the thermodynamic properties of the Kerr-Bertotti-Robinson black hole, an exact Petrov type-D solution of Einstein-Maxwell theory describing a rotating black hole im…
Numerical simulations of primordial black hole formation via delayed first-order phase transitions
Zhuan Ning, Xiang-Xi Zeng, Rong-Gen Cai +1
We perform fully nonlinear, spherically symmetric numerical simulations of superhorizon false-vacuum-domain (FVD) collapse in a coupled gravity-scalar-fluid system to study primord…
Acoustic gravitational waves from primordial curvature perturbations
Zhuan Ning, Zi-Yan Yuwen, Xiang-Xi Zeng +2
Standard perturbative calculations of scalar-induced gravitational waves (SIGWs) have neglected nonperturbative effects in the large-amplitude regime. We develop a hybrid numerical…
Constraining interacting dark energy models with black hole superradiance
Zhen-Hong Lyu, Rong-Gen Cai, Shao-Jiang Wang +1
The recent preference for a dynamical dark energy (DE) from the Dark Energy Spectroscopic Instrument seems to call for interactions between DE and dark matter (DM), either from dir…
Third law of repetitive electric Penrose processes
Li Hu, Rong-Gen Cai, Shao-Jiang Wang
Recently, Ruffini et al. [Phys. Rev. Lett. 134 (2025) 8, 081403] pointed out that the repetitive Penrose process cannot drain the entire extractable energy of a Kerr black hole. In…
Prospect on constraining environment-dependent dilaton model from gravitational redshift measurements
Li Hu, Rong-Gen Cai, Song He +4
Scalar-tensor gravity represents a natural extension of general relativity. This paper investigates a conformal scalar-tensor gravity, the environmentally dependent dilaton model,…
Scalar-induced gravitational waves with non-Gaussianity up to all orders
Xiang-Xi Zeng, Zhuan Ning, Rong-Gen Cai +1
Scalar-induced gravitational waves (SIGWs) are ubiquitous in many early-Universe processes accompanied by non-Gaussianity; while Gaussian perturbation can generate significant SIGW…
Resolving the Planck-DESI tension by nonminimally coupled quintessence
Jia-Qi Wang, Rong-Gen Cai, Zong-Kuan Guo +1
The Planck measurement of the cosmic microwave background (CMB) has established the -cold-dark-matter (CDM) model as the concordant model along with other observations. Howev…
Black hole-de Sitter space as the fastest transmitter and receiver
Rong-Gen Cai, Li Hu, Shao-Jiang Wang
It is well-known that the unitary nature of black hole evaporation enforces its entropy evolution to follow the Page curve. In this Letter, we find that the quantum speed limit on…
Sound waves from primordial black hole formations
Zhuan Ning, Xiang-Xi Zeng, Zi-Yan Yuwen +3
We present a numerical investigation of primordial black hole (PBH) formation from super-horizon curvature perturbations and the subsequent generation and propagation of sound wave…
Relic gravitational waves from primordial gravitational collapses
Xiang-Xi Zeng, Zhuan Ning, Zi-Yan Yuwen +3
A large primordial density perturbation of the Hubble scale will gravitationally collapse, generating an outgoing sound shell, whether or not a primordial black hole (PBH) is forme…
The DESI DR1/DR2 evidence for dynamical dark energy is biased by low-redshift supernovae
Lu Huang, Rong-Gen Cai, Shao-Jiang Wang
Recently, a preference for dynamical dark energy has been reported by the Dark Energy Spectroscopic Instrument (DESI) collaboration, which has inspired hot debates on new…
Dynamical friction can flip the hierarchical three-body system
Li Hu, Rong-Gen Cai, Shao-Jiang Wang
In recent years, the long-term effects of non-linear perturbations were found to be important for the evolution of the hierarchical triple system, which, for the central third body…
Anisotropies of cosmological gravitational wave backgrounds in non-flat spacetime
Rong-Gen Cai, Shao-Jiang Wang, Zi-Yan Yuwen +1
Recent reports of stochastic gravitational wave background from four independent pulsar-timing-array collaborations have renewed the interest in the cosmological gravitational wave…
Narrowing down the Hubble tension to the first two rungs of distance ladders
Lu Huang, Rong-Gen Cai, Shao-Jiang Wang +2
The decade-persistent Hubble tension has become a crisis of modern cosmology between the early-Universe extrapolation from globally fitting the standard CDM to Planck-CMB m…
Bubbles kick off primordial black holes to form more binaries
Zi-Yan Yuwen, Cristian Joana, Shao-Jiang Wang +1
Primordial black holes (PBHs) may form before cosmological first-order phase transitions, leading to inevitable collisions between PBHs and bubble walls. In this Letter, we have si…
Multiple peaks in gravitational waves induced from primordial curvature perturbations with non-Gaussianity
Xiang-Xi Zeng, Rong-Gen Cai, Shao-Jiang Wang
First-order primordial curvature perturbations are known to induce gravitational waves at the second-order, which can in turn probe the small-scale curvature perturbations near the…
Primordial black holes and curvature perturbations from false vacuum islands
Rong-Gen Cai, Yu-Shi Hao, Shao-Jiang Wang
Recently, much attention has been focused on the false vacuum islands that are flooded by an expanding ocean of true-vacuum bubbles slightly later than most of the other parts of t…
Distinctive GWBs from eccentric inspiraling SMBH binaries with a DM spike
Li Hu, Rong-Gen Cai, Shao-Jiang Wang
Recent detections of a low-frequency gravitational wave background (GWB) from various pulsar-timing-array (PTA) observations have renewed the interest in the inspiraling supermassi…