Gravitational lens - Wikipedia
Simulated gravitational lensing (black hole passing in front of a background galaxy) In general relativity, light follows the curvature of spacetime, hence when light passes around a massive object, it is bent. This means that the light from an object on the other side will be bent towards an observer's eye, just like an ordinary lens.
[0911.2187] Gravitational Lensing by Black Holes - arXiv.org
2009年11月11日 · We review the theoretical aspects of gravitational lensing by black holes, and discuss the perspectives for realistic observations. We will first treat lensing by spherically symmetric black holes, in which the formation of infinite sequences of higher order images emerges in the clearest way.
Gravitational Lensing By A Black Hole - HubbleSite
2022年6月10日 · This illustration reveals how the gravity of a black hole warps space and bends the light of a distant star behind it. A black hole is the crushed remnant of a massive star that exploded as a supernova. The black hole traps light due to its intense gravitational field, hence it cannot be seen directly. The black hole distorts the space around ...
Strong gravitational lensing by Kerr and Kerr-Newman black holes
2021年1月22日 · We study the strong gravitational lensing due to the Kerr black holes with angular momentum $a$ and the Kerr-Newman black holes with additional charge $Q$. We first derive the analytical expressions of the deflection angles of light rays that particularly diverge as they travel near the photon sphere. In this strong deflection limit, the light ...
Light-bending gravity reveals one of the biggest black holes ever …
2023年3月28日 · This gravitational "lensing" effect offers an observation method to infer the presence of black holes and measure their mass, based on how significant the light bending is.
Gravitational Self-Lensing of Massive Black Hole Binaries
2021年10月22日 · Astronomers calculate that its optical sky survey should detect signs of as many as one hundred binary massive black holes in galaxies as their light fluctuates due to gravitational self-lensing. A "massive" black hole (MBH) is one whose mass is more than about one hundred thousand solar-masses.
In practice, a source behind a black hole produces not only the two classical weak-field gravitational lensing images but also an infinite number of strong-field images corresponding to photons with winding numbers run-ning from 1 to infinity.
Gravitational lensing by spinning black holes in ... - IOPscience
2015年2月13日 · We have also used DNGR to explore, for a camera orbiting a fast spinning black hole, the gravitational lensing of a star field on the celestial sphere—including the lensing's caustics and critical curves, and how they influence the stellar images' pattern on the camera's sky, the creation and annihilation of image pairs, and the image motions.
Title: Gravitational Lensing in the Kerr Spacetime: An Analytic ...
2 天之前 · Using the exact analytic solutions to investigate exact gravitational lensing of light and gravitational waves emitted by sources outside the accretion disk has only received limited attention so far. Therefore, the focus of this paper will be to address this question.
Gravitational Lensing - Harvard–Smithsonian Center for …
Their gravity distorts the structure of spacetime, magnifying light from more distant objects. This effect, known as strong gravitational lensing, allows astronomers to study galaxies that would ordinarily be too far to see, map the distribution of mass in the galaxies doing the lensing, and measure the expansion rate of the universe.