Explanipedia

Spherically symmetric charged (anti-)de Sitter black hole in $f(R,T)$ gravity coupled with nonlinear electrodynamics Open

Tsang Ing Ren, Yuhan Hua, Rong-Jia Yang · 2025

By deriving and solving the gravitational and electromagnetic field equations in $f(R,T)$ gravity coupled with nonlinear electrodynamics, we obtain a static spherically symmetric charged solution that incorporates higher-order correction t…

Regular hairy black holes through gravitational decoupling method Open

Yuhan Hua, Zhenglong Ban, Tongtian Ren, Jia-Jun Yin, Rong-Jia Yang · 2025

Within a framework requiring a well-defined event horizon and matter obeying the weak energy condition, we employ gravitational decoupling method to construct non-singular hairy black holes: spherically or axially symmetric. These solution…

Observational properties of black hole in quantum fluctuation modified gravity Open

Jia-Jun Yin, Tong-Yu He, Ming Liu, Hui-Min Fan, Bohai Chen , et al. · 2025

Damping of gravitational waves in f(R) gravity Open

Haiyuan Feng, Laiyuan Su, Rong-Jia Yang, Wei-Qiang Chen · 2025

We investigate the damping of gravitational waves (GW) in f ( R ) gravity by matter. By applying the kinetic theory, we examine the first-order approximation of the relativistic Boltzmann equation. In the flat spacetime, we derive the evol…

Results from Hubble Parameter Data Using a Model Independent Method Open

Rong-Jia Yang · 2025

Reconstructing square-law k-inflation from Planck data Open

Ming Liu, Tong-Yu He, Bohai Chen, Zhanwen Han, Rong-Jia Yang · 2024

We explore a square-law k-inflation using the Hamilton-Jacobi approach. Focusing on scenarios where the Hubble parameter exhibits a power-law dependence on the k-field, our analysis encompasses the computations of crucial observables, such…

Black holes in $f(R)$ gravity coupled to nonlinear electromagnetic fields Open

Yong-Ben Shi, Rong-Jia Yang · 2024

We establish a framework to construct spherically symmetric and static solutions in $f(R)$ gravity coupled with nonlinear electromagnetic fields. We present two new specific solutions and discuss the energy conditions. We calculate some th…

A new parametrization of Hubble function and Hubble tension Open

Tong-Yu He, Jia-Jun Yin, Zhenyu Wang, Zhanwen Han, Rong-Jia Yang · 2024

We present a new Hubble parameterization method and employ observational data from Hubble, Pantheon, and Baryon Acoustic Oscillations to constrain model parameters. The proposed method is thoroughly validated against these datasets, demons…

Accretion of matter by a charged dilaton black hole Open

Yinan Jia, Tong-Yu He, Wen-Qian Wang, Zhanwen Han, Rong-Jia Yang · 2024

Stability of the de-Sitter universe: one-loop nonlocal f (R) gravity Open

Haiyuan Feng, Yi Liao, Rong-Jia Yang · 2024

A bstract With the method of the background field expansion, we investigate the one-loop quantization of the Euclidean nonlocal f ( R ) model in the de-Sitter universe. We obtain the ghost-free condition (GFC) based on the transformation f…

Thin accretion disk and shadow of Kerr-Sen black hole in Einstein-Maxwell-dilaton-axion gravity Open

Haiyuan Feng, Rong-Jia Yang · 2024

We investigate the thin disk and shadow of Kerr-Sen black hole in Einstein-Maxwell-dilaton-axion gravity. The results reveal that as the dilaton parameter $r_2$ increase, the energy flux, the radiation temperature, the spectra luminosity, …

Analysis of the Geodesic Motions of Massive Particles in Kerr–Sen–AdS4 Spacetime Open

Ziqiang Cai, Ming Liu, Wen-Qian Wang, Tong-Yu He, Zhanwen Han , et al. · 2024

We consider geodesic motions in Kerr–Sen–AdS4 spacetime. We obtain equations of motion for light rays and test particles. Using parametric diagrams, we show some regions where radial and latitudinal geodesic motions are allowed. We analyze…

Baryogenesis in quantum fluctuation modified gravity Open

Rong-Jia Yang, Yong-Ben Shi · 2024

We consider baryogenesis in quantum fluctuation modified gravity. We explore three forms (two are newly proposed here) of baryogenesis interaction and discuss the effect of these interaction terms on the baryon-to-entropy ratio during the …

Low intensity beam current measurement of the Associated Proton Beam Line at CSNS Open

Ruiyang Qiu, Wei Huang, Fei Li, L. Zeng, Muhammad Abdul Rehman , et al. · 2024

The Associated Proton beam Experiment Platform (APEP) beamline is the first proton irradiation facility to use naturally-stripped protons which come from H-beams interacting with the residual gas in the linac beampipe at CSNS. The stripped…

Possible evidences from parameter data for physics beyond CDM Open

Rong-Jia Yang · 2023

We analyse H(z) parameter data with some conditions by using Lagrange mean value theorem in Calculus. We find that: (1) there exists decelerated phase at 1 σ confidence level in the redshift range (0.38,0.59); (2) the equation of motion of…

Stability of the de-Sitter universe: One-loop nonlocal $f(R)$ gravity Open

Haiyuan Feng, Yi Liao, Rong-Jia Yang · 2023

With the method of the background field expansion, we investigate the one-loop quantization of the Euclidean nonlocal $f(R)$ model in the de-Sitter universe. We obtain the ghost-free condition (GFC) based on the transformation from the Jor…

Surface skyrmions and dual topological Hall effect in antiferromagnetic topological insulator EuCd$_2$As$_2$ Open

Min Wu, Rong-Jia Yang, Xiangde Zhu, Yixiong Ren, Ang Qian , et al. · 2023

In this work, we synthesized single crystal of EuCd$_2$As$_2$, which exhibits A-type antiferromagnetic (AFM) order with in-plane spin orientation below $T_N$ = 9.5~K.Optical spectroscopy and transport measurements suggest its topological i…

Physical analysis of Rastall PFRF black hole through accretion process Open

Hamood Ur Rehman, G. Abbas, Abdul Jawad, Rong-Jia Yang, G. Mustafa · 2023

The adiabatic accretion onto the charged black hole surrounded by perfect fluid radiation field (PFRF) in Rastall gravity is addressed in this manuscript. For this purpose, mass accretion rate $$\dot{M}$$ , critical horizon radius and …

Mass Ratio Distribution of Hierarchical Triple Systems from the LAMOST-MRS Survey Open

Tong-Yu He, Jiangdan Li, Xuefei Chen, Rong-Jia Yang, Lin Xiao , et al. · 2023

Hierarchical triple-star systems consists of three components organized into an inner binary ( M 1 , M 2 ) and a more distant outer tertiary ( M 3 ) star. The LAMOST Medium-Resolution Spectroscopic Survey has offered a great sample for the…

Hamilton-Jacobi formalism for k-inflation Open

Rong-Jia Yang, Ming Liu · 2023

We consider a type of k-inflation under the Hamilton-Jacobi approach. We calculate various observables such as the scalar power spectrum, the tensor-to-scalar ratio, the scalar spectra index for the case where the Hubble parameter is a pow…

Types of the geodesic motions in Kerr-Sen-AdS$_{4}$ spacetime Open

Ziqiang Cai, Tong-Yu He, Wen-Qian Wang, Zhanwen Han, Rong-Jia Yang · 2023

We consider the geodesic motions in the Kerr-Sen-AdS$_4$ spacetime. We obtain the equations of motion for light rays and test particles. Using the parametric diagrams, we shown some regions where the radial and latitudinal geodesic motions…

Choked accretion onto Kerr-Sen black holes in Einstein-Maxwell-dilaton-axion gravity Open

Haiyuan Feng, Yingdong Wu, Rong-Jia Yang, Leonardo Modesto · 2023

We investigate the process of an ultrarelativistic fluid accreted onto axisymmetric Kerr-Sen black holes in Einstein-Maxwell-dilaton-axion theory. We obtain the solution describing the velocity potential of a stationary irrotational fluid …

Accretion of the Vlasov Gas Onto a Schwarzschild-Like Black Hole Open

Rong-Jia Yang, Ziqiang Cai · 2023

Thin accretion disks around a black hole in Einstein-Aether-scalar theory Open

Tong-Yu He, Ziqiang Cai, Rong-Jia Yang · 2022

We consider the accretion process in the thin disk around a supermassive black hole in Einstein-aether-scalar theory. We probe the effects of the model parameter on the physical properties of the disk. The results show that with increasing…

Thin accretion disks around a black hole in Einstein-Aether-scalar theory Open

Tong-Yu He, Rong-Jia Yang, Ziqiang Cai · 2022

We consider the accretion process in the thin disk around a supermassive black hole in Einstein-aether-scalar theory. We probe the effects of the model parameter on the physical properties of the disk. The results show that with increasing…

Exact solution for accretion onto a moving charged dilaton black hole Open

Rong-Jia Yang, Yinan Jia, Lei Jiao · 2022

We present an analytic solution for accretion of a gaseous medium with adiabatic equation of state onto a charged dilaton black hole which moves at a constant velocity. We determine the four-velocity of accreted flow and find that it posse…

Accretion of the Vlasov gas onto a Schwarzschild-like black hole Open

Ziqiang Cai, Rong-Jia Yang, Yinan Jia · 2022

We consider spherical steady accretion of the relativistic Vlasov gas onto a Schwarzschild-like black hole. We determine the expressions for the particle current density and accretion rate and present the limiting expressions for the mass …

Adiabatic accretion onto black holes in Einstein-Maxwell-scalar theory Open

Haiyuan Feng, Miao Li, Gui-Rong Liang, Rong-Jia Yang · 2022

We study the adiabatic accretion process of ordinary baryonic gas onto spherically symmetric black holes in Einstein-Maxwell-scalar theory, with two parameters α and β in the coupling term. Especially, we demonstrate the range of the trans…

Exact solution for accretion onto a moving charged dilaton black hole Open

Rong-Jia Yang, Yinan Jia, Lei Jiao · 2021

We present an analytic solution for accretion of a gaseous medium with adiabatic equation of state onto a charged dilaton black hole which moves at a constant velocity. We determine the four-velocity of accreted flow and find that it posse…

Accretion Torque Reversals in GRO J1008-57 Revealed by Insight-HXMT Open

Wei Wang, Y. M. Tang, Y. L. Tuo, Prahlad R. Epili, Shuang‐Nan Zhang , et al. · 2021

GRO J1008-57, as a Be/X-ray transient pulsar, is considered to have the highest magnetic field in known neutron star X-ray binary systems. Observational data of the X-ray outbursts in GRO J1008-57 from 2017 to 2020 were collected by the In…

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