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Interactions ondes-courant-obstacle : application à la physique des trous noirs

Abstract : The aim of the PhD is the observation the Hawking radiation in the laboratory, this astounding prediction of the English astrophysicist Stephen Hawking made in 1974: black holes are not black. In other words, they do not absorb anything within reach but emit a radiation. In addition to the complications of the fact that these celestial objects are thousands of light years away, this radiation is so weak that it would be like trying to hear a whisper in a rock concert. But William Unruh, in 1981, proposed a solution: to use hydrodynamic systems which have the same mathematical equations as in astrophysics. More precisely, in our case, we use the correspondence between the propagation of light in the vicinity of a black hole and surface waves propagation on a inhomogeneous countercurrent (due to the presence of a submerged obstacle). For this, a thorough understanding of the surface waves physics is necessary (variable bathymetry, vorticity, non-linearities ...). On the technical side, a free surface measurement method has been developed and optimized.
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Léo-Paul Euvé. Interactions ondes-courant-obstacle : application à la physique des trous noirs. Mécanique des fluides [physics.class-ph]. Université de Poitiers, 2017. Français. ⟨NNT : 2017POIT2280⟩. ⟨tel-01981520⟩

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