Gravitation

Découvertes scientifiques et leur place dans la société, de la Terre à l'Univers. Un film avec la participation de Matteo Barsuglia.

 

Découvertes scientifiques et leur place dans la société, de la Terre à l'Univers.

Film avec la participation de Matteo Barsuglia.

 

Validation expérimentale des performances interférométriques de LISA

                  Le projet LISA de détection des ondes gravitationnelles a été sélectionné comme mission ‘Large’ de l’ESA au printemps 2017, pour un lancement prévu en 2034. Cette mission repose sur la capacité à mesurer, par interférométrie optique, l’amplitude des fluctuations de la distance entre trois satellites distants de 2.5 Mkm avec une précision picométrique sur des périodes de temps de quelques secondes à quelques heures.

Detecting low-frequency gravitational waves

The first detection of gravitational waves (GWs) from coalescing binary black holes by the
LIGO-VIRGO scientific collaboration has opened a new era in astrophysics: gravitational wave
astronomy. The ground based detectors operate at high frequencies (above 10 Hz), and there are
two major world-wide efforts to detect GW st low frequency. The GWs in the nano-Hz band will
be detected with the Pulsar Timing Array (PTA).
Here we use nature-provided detector: we monitor ultra-stable millisecond pulsars which work

Simulations and associated data analysis for realistic LISA configuration / Simulations et analyses de données pour une configuration réaliste de LISA

The Laser Interferometer Space Antenna (LISA) is a large mission of the European Space Agency. It will address the scientific theme of "The Gravitational Universe" by observing gravitational waves sources emitting between 0.02 milliHertz and 1 Hertz. LISA is formed by tree spacecrafts on heliocentric orbits exchanging laser beams over 2.5 millions kilometers in order to measure the deformation of spacetime of few pico-meters due to gravitational waves.

2-years post-doctoral position on experimental gravitational-wave astronomy

The first LIGO-Virgo gravitational-wave detections had dramatic consequences for astrophysics, cosmology and tests of general relativity. In order to increase the volume of the observed sky and then the signal-to-noise ratio of the signals detected, an increase of the Virgo sensitivity is crucial. In the next years, periods of data takings alternated with periods of detector’s upgrades will be performed for both Virgo and LIGO.

Increasing the science reach of the LIGO-Virgo gravitational-wave detector network by improving the sensitivity and the quality of the Virgo data.

In August 2017 Virgo made its first gravitational-wave detections together with LIGO. The detection of the gravitational-waves emitted by the binary black-hole coalescence (GW170814) and the binary neutron star coalescence (GW170817, with its electromagnetic counterparts GRB170817a and AT2017gfo) had dramatic consequences for astrophysics, cosmology and tests of general relativity.

Pages

S'abonner à RSS - Gravitation