arXiv subjects

Yingdong Wu

Publications and source records attributed to Yingdong Wu.

4 recordsLinked to original sources

arXiv2025

Probing Einstein-Maxwell-Scalar Black hole via Thin Accretion Disks and Shadows with EHT Observations of M87* and Sgr A*

We investigated the shadows and thin accretion disks of Einstein-Maxwell-Scalar (EMS) black hole. Firstly, we investigated the influence of EMS parameters on the black hole shadow using the null geodesic method and constrained these parameters based on EHT observations of M87* and Sgr A*. Furthermore, we analyzed the direct emission, lensing ring, and photon ring structures in EMS black hole. Comparing our results with the Schwarzschild and Reissner-Nordstr$\ddot{\mathrm{o}}$m (RN) black holes, we found that the Schwarzschild black hole exhibits the largest shadow radius and the highest observed intensity.

gr-qc↗

arXiv2025

Quantum interference in the Einstein-Maxwell-Scalar spacetime

We investigate gravitationally induced interference within the framework of teleparallel gravity, deriving a general expression for the gravitational phase difference and applying it to an EMS spacetime. We then analyze how this phase difference is affected by the presence or absence of black hole charge. Our results show that, irrespective of charge, the dominant contribution to the gravitational phase difference arises from the black hole mass. Nevertheless, while the influence of charge is negligible under standard astrophysical conditions, we identify a possible amplification mechanism through its interplay with the coupling parameter $α$ in the case of extremal charged black holes. This finding not only offers new theoretical insights but also suggests experimental opportunities for probing charged black hole parameters via quantum interferometric techniques.

gr-qc↗

arXiv2024

Thin accretion disk around black hole in Einstein-Maxwell-scalar theory

We examine the accretion process in a thin disk surrounding a supermassive black hole within the framework of Einstein-Maxwell-scalar (EMS) gravity. Our investigation aims to elucidate how variations in model parameters affect different physical properties of the disk. When keeping EMS parameters $β$ and $q$ constant, we observe a reduction in radiation flux and temperature as $α$ increases. However, the luminosity and radiative efficiency exhibit relatively minor variation. Conversely, under fixed $α$ and $q$, an escalation in $β$ leads to heightened levels of radiation flux, temperature, luminosity, and radiative efficiency. These results underscore the diverse influences of model parameters on observable metrics, providing valuable insights for the astronomical study of distinct black holes.

gr-qc↗

arXiv2024

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

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 with a stiff equation of state and the solution for the streamlined diagram of the quadrupolar flow. We also investigate how the solution's coefficients and the stagnation points are affected by the parameters. The injection rate, the ejection rate, and the critical angle are discussed in detail. We find that with an increasing dilaton parameter the ratio of the ejection rate to the injection rate increases and that the radiative efficiency is larger, while the redshift is lower, compared to the Kerr black hole.

astro-ph.HE↗