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The physics of black holes

It is time to explore the black hole, to discuss the gravitational effects when one gets very close to the horizon, and to cross this horizon. Join the trip across! …

Information flow

Black holes are not just absorbing matter and radiation. Stephen Hawking has shown that they are also emitting radiation. What happens then to the information that disappears into the black …

How to see black holes

Astrophysical black holes have a rich matter environment: they organise the matter in their close vicinity. It is this very specific environment that allows us to identify black holes. Ultimately, …

The LISAPathfinder mission

The LISAPathfinder mission is a technological mission that tests the main technological challenges of the future gravitational wave observatory LISA. The launch took place on December 3, 2015 from the …

The life of a star

Why is it important to follow the life cycle of a star? Because they end up as compact stars such as white dwarfs, neutron stars or… black holes. Meanwhile, we …

Cosmic explosions

Sources of gravitational waves necessarily involve bulk matter in motion. This is the case of violent cosmic explosions, or of binary systems of stars rotating around each other. Such a …

Precision metrology and interferences

The smallness of the effect produced by gravitational waves imposes to use very precise measuring devices. Light provides very accurate distance standards, and the ultra-precise metrology used is based on …

Gravitational wave detectors

The world has been gearing up to make the first direct observation of a gravitational wave. A very large programme of ground detectors, based on interferometry, is now almost ready. …

Electromagnetic vs gravitational waves

Just as light has taught us so much about electromagnetic phenomena, one expects that, once they are identified, gravitational waves will be a wonderful tool to grasp our Universe. (2.38)

Gravitational waves

What are gravitational waves? Ripples of curvature moving across the Universe. They thus change the properties of space-time when and where they pass by. But gravity is a very weak …

Dark Puzzles

Dark matter plays a significant role in the formation of galaxies. But many mysteries remain: what is the nature of dark matter? why is dark/luminous matter insufficient to account for …

Dark Energy

In 1999, the news that, in the recent evolution of the Universe, the expansion has been accelerating came as a total surprise, all the more because all known forms of …

Vacuum Energy

The best candidate for dark energy is what is known as vacuum energy. We have encountered it with inflation where it triggers the explosive expansion. It is therefore no surprise …
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