On the 7th June 2016, the first results of LISAPathfinder have been announced. LISAPathfinder is a technological demonstrator for a space-based gravitational waves observatory as LISA (Laser Interferometer Space Antenna) mission. This laboratory in space measured a residual differential acceleration between its two free-falling test-masses below than 5*10^-15 m.s^-2.Hz^-1/2 more than 5 times better than the requirements. This was the green light for LISA mission. ESA approved the LISA mission as the large mission on the theme "The Gravitational Universe". This future observatory will observe gravitational wave from space between 0.02mHz and 0.1Hz, opening a new window on the Universe complementary to LIGO/Virgo and Pulsar Timing Array. The expected sources are SuperMassive Black Hole Binaries until very high redshift, tens of thousands of Galactic Binaries, Extreme Mass Ratio Inspiral, Stellar Mass Black Hole Binaries, stochastic backgrounds from the very early Universe plus all the unexpected sources.
In this talk, I will described the LISAPathfinder mission and its first results. Then I will present LISA mission and its expected performances. I will review the scientific goals of LISA in astrophysics, physics and cosmology. Finally, I will conclude with the status of the mission and the role of France.
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