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Accueil du site > Séminaires > Séminaire du Laboratoire Kastler-Brossel
Séminaire du Laboratoire Kastler-Brossel
Les séminaires ont lieu le lundi à 11 heures 30
en Salle de Conférence IV (2ème étage)
au Département de Physique de L’Ecole Normale Supérieure
24, rue Lhomond Paris 5ème
Prochain séminaire : le lundi 14 mai à 11h30 en salle de Conférence IV (E244 nouvelle numérotation) au Département de Physique de l’ENS.
MIGA, A matter wave - laser based interferometer gravitation antenna par Philippe Bouyer, Laboratoire Photonique, Numérique et Nanoscience (LP2N), Talence
Résumé
The Matter wave - laser based Interferometer Gravitation Antenna (MIGA) is a founded EQUIPEX project which aims at the construction of a novel infrastructure to study strain tensor of space-time and gravitation. Using a novel approach for strain measurement, based on quantum mechanics, this infrastructure will allow for deeper understanding of the earth’s gravity field over a very broad band, from frequencies of less than 1 cycle per second to those in excess of hundreds of hertz. The applications of MIGA extend from monitoring the evolution of the gravitational field to providing a new tool for detecting gravitational waves. By combining geophysics and fundamental physics application in a single infrastructure, MIGA will lead to an unprecedented step in understanding geophysical phenomena and will allow for enhancing existing and future gravitational wave detectors. It will keep France among the leaders in many major fields ; fundamental physics, matter wave interferometry, geophysics and gravitational wave astronomy.
The MIGA Instrument will be installed at LSBB in Rustrel, France. It uses a novel approach for seismic studies and will improve the sensitivity of strain measurements by combining laser and matter-wave interferometry. It will allow for enhancing our observations of earth strain variation at low frequencies, our understanding of geophysical fluctuations of the gravity field and our knowledge of gravity gradients variations and fluctuations in underground laboratories. Because our combined approach shares many design characteristics with laser-interferometric gravitational wave detectors, MIGA will help pushing the fundamental limits of ground-based gravitational wave (GW) detectors, set by seismic and gravity gradient noise, by embedding matter-wave and laser interferometer together. MIGA can also be used for other basic science objectives. For instance, a precise time-mapping of the fluctuation of gravitational forces can give us limits on the violations of the Lorentz invariance on thus open new windows in our understanding of quantum gravity. MIGA takes advantage of the latest progress in atom interferometry. It will be the first of a new generation of subterranean detectors for geoscience, seismology and fundamental physics.
