The physics of accretion disks around black holes

La physique des disques d'accrétion autour des trous noirs

IN BRIEF Black hole: a region of space with an intense gravitational field. Accretion disk: matter in orbit around a celestial body, often composed of gas and dust. Accretion disks around supermassive black holes: key to observing the accretion of matter. Inclination of the accretion disk and angle of observation influence the detected brightness. Emission … Read more

The paradox of information in black holes

Le paradoxe de l'information dans les trous noirs

IN SHORT Information Paradox: question about the conservation of information in black holes. Black Hole: a region of space where gravity is so strong that not even light can escape. Baldness Theorem: a black hole is described solely by mass, charge, and angular momentum. Hawking Radiation: theory that black holes can evaporate by emitting energy. … Read more

Black holes: physics and mysteries

Les trous noirs : physique et mystères

IN BRIEF Definition: Celestial objects in an intense gravitational field. Formation: Collapse of a massive star at the end of its life. Singularity: Central point where mass is concentrated. Dark matter and dark energy: Mysteries related to their presence around black holes. General relativity: Theoretical framework to study the properties of black holes. X-ray telescopes: … Read more

The role of black holes in the universe

Le rôle des trous noirs dans l'univers

IN BRIEF Definition: Celestial objects with intense gravitational fields. Composition: Very compact, high mass/size ratio. Role: Impact on the growth of galaxies. Event horizon: Limit beyond which nothing can escape. Time travel: The gravity of a black hole allows for time dilation. Environment: Influence on galactic structures and their dynamics. Scientific research: Studies conducted to … Read more