5 papers
Energy conditions in static, spherically symmetric spacetimes and effective geometries
Zi-Liang Wang, Emmanuele Battista
Classical energy conditions are investigated in generic static and spherically symmetric spacetimes. In setups with nonconstant , the appearance of horizons can sign…
Families of regular spacetimes and energy conditions
Zi-Liang Wang, Emmanuele Battista
We present a systematic method for constructing static, spherically symmetric regular spacetimes in general relativity satisfying the weak energy condition. Our approach relies on…
Shadows of quintessence black holes: spherical accretion, photon trajectories, and geodesic observers
Ji-Wen Li, Zi-Liang Wang, Tao-Tao Sui
The presence of a quintessence-like field can influence the black hole shadow through three primary mechanisms: the dynamics of accretion flows, the trajectories of photons, and th…
Exploring the role of accretion disk geometry in shaping black hole shadows
Zi-Liang Wang
We study black hole imaging in the context of geometrically thick accretion disks in Schwarzschild spacetime. By decomposing the emitting region into a set of one-dimensional lumin…
Dynamical features and shadows of quantum Schwarzschild black hole in effective field theories of gravity
Zi-Liang Wang, Emmanuele Battista
We investigate the properties of the Schwarzschild black hole geometry involving leading one-loop long-distance quantum effects, which arise within the framework of effective field…