Calibration and data reconstruction for the Virgo interferometer : how to compute the data reconstruction uncertainty

• Cervane GRIMAUD (LAPP)

Room: Auditorium Marcel Vivargent Virgo is a gravitational wave detector located near Pisa in Italy. It is composed of a Fabry-Perot Michelson Interferometer and allows to detect gravitational wave passing through it using the interference dark fringe signal going out of the interferometer. Virgo is an instrument that needs to be controlled and calibrated with great accuracy in order to achieve the precision required to detect further and further gravitational waves sources. In this talk I'll describe the calibration process of the Virgo interferometer as well as how the calibration is linked to the data reconstruction and its uncertainty computation.

Lorentz invariance violation search with the Cherenkov Telescope Array Observatory Large-Sized Telescope

• Cyann Plard (LAPP IN2P3 CNRS)

Room: Auditorium Marcel Vivargent The flares of active galactic nuclei (AGNs) can be used to detect or constrain Lorentz invariance violation (LIV) by measuring time lags in detection of high energetic photons. An important source of uncertainty is our lack of knowledge of source intrinsic processes. However, combining flares and sources allows us to increase the precision of these measurements as well as to limit the noise of intrinsic source effects. Cherenkov Telescope Array (CTA) will be the next generation of TeV gamma-ray observatory. I will present the first results obtained searching for LIV from the data recorded by its first prototype, the Large Sized Telescope (LST-1).