Enrico Calloni

TL;DR: Einstein gravitational-wave Telescope (ET) is a design study funded by the European Commission to explore the technological challenges of and scientific benefits from building a third generation gravitational wave detector as discussed by the authors.

Abstract: We report the results of the first joint observation of the KAGRA detector with GEO 600. GEO 600 and KAGRA performed a joint observing run from April 7 to 20, 2020. We present the results of the joint analysis of the GEO–KAGRA data for transient gravitational-wave signals, including the coalescence of neutron-star binaries and generic unmodeled transients. We also perform dedicated searches for binary coalescence signals and generic transients associated with gamma-ray burst events observed during the joint run. No gravitational-wave events were identified. We evaluate the minimum detectable amplitude for various types of transient signals and the spacetime volume for which the network is sensitive to binary neutron-star coalescences. We also place lower limits on the distances to the gamma-ray bursts analysed based on the non-detection of an associated gravitational-wave signal for several signal models, including binary coalescences. These analyses demonstrate the feasibility and utility of KAGRA as a member of the global gravitational-wave detector network.

TL;DR: In this paper, the Virgo collaboration is de.ning now the path to arrive to a complete design of the advanced version of the detector within about two years, and the upgrades needed to obtain a detector with improved sensitivity in a relatively short time are discussed.

TL;DR: The automatic alignment system of the Virgo interferometer differs substantially from those used in similar experiments, since it uses a variant of the Anderson technique, and the main feature is a strong coupling of different degrees of freedom in the optical signals as mentioned in this paper.

TL;DR: A methodology of network data analysis applied to the search for coincident burst excitations over a 24 h long data set collected by AURIGA, EXPLORER, NAUTILUS and Virgo detectors, aiming at setting confidence intervals as stringent as possible in terms of the rate of the selected source models.