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What are gravitational waves in general, not just in the weak field/linearized theory?
Gravitational waves are ripples in the fabric of space-time caused by the acceleration of massive objects. They were first predicted by Albert Einstein's theory of general relativity.
Gravitational waves are detected using specialized instruments called interferometers. These instruments use lasers to measure tiny changes in distance caused by passing gravitational waves.
Detecting gravitational waves allows us to study the universe in a completely new way. It provides us with a new tool for observing and understanding some of the most violent and energetic events in the universe, such as black hole mergers and supernova explosions.
Gravitational waves can travel through any medium, including empty space. They are not affected by electromagnetic forces and can pass through objects that would block other forms of radiation, such as light.
Yes, there are three types of gravitational waves: continuous, burst, and stochastic. Continuous waves are produced by slowly rotating objects, burst waves are produced by sudden and violent events, and stochastic waves are produced by the collective effects of many sources.