Quantum gravity and black holes

Black holes embody one of the deepest mysteries of the universe, revealing both the extreme power of gravity and the limits of current physics. These celestial objects, formed from the collapse of massive stars, concentrate an incredible mass into an infinitely small space. As a result, they become natural laboratories where quantum gravity and quantum … Read more

The entropy of black holes and information

Since the 1970s, the study of black holes has profoundly transformed the understanding of entropy, a fundamental concept in thermodynamics, by tying it to the most mysterious astrophysical objects in the universe. The revelation that these strange regions of spacetime can possess entropy, measuring the amount of information they contain, has not only opened new … Read more

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