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Astron. Astrophys. 351, 811-814 (1999)

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Crosscorrelation measurement of stochastic gravitational waves with two resonant gravitational wave detectors

P. Astone 1, M. Bassan 2, P. Bonifazi 3,1, P. Carelli 4, C. Cosmelli 6, E. Coccia 2, V. Fafone 5, S. Frasca 1,6, A. Marini 5, Y. Minenkov 2, I. Modena 2, G. Modestino 5, A. Moleti 2, G.V. Pallottino 1,6, M.A. Papa 5, G. Pizzella 2,5, F. Ronga 5, R. Terenzi 3,2, M. Visco 3,2 and L. Votano 5

1 Istituto Nazionale di Fisica Nucleare (INFN), P. A. Moro 2, 00185 Rome, Italy
2 Physics Department, University Tor Vergata and INFN, Via O.Raimondo, 00173 Rome, Italy
3 Istituto di Fisica dello Spazio Interplanetario-CNR, Via Fosso del Cavaliere, 00133 Rome, Italy
4 University of L' Aquila and INFN, L' Aquila, Italy
5 Laboratorio Nazionale INFN, Via E. Fermi 40, 00044 Frascati, Italy
6 Physics Department, University La Sapienza and INFN, P. A. Moro 2, 00185 Rome, Italy

Received 2 October 1998 / Accepted 21 September 1999


We report on the crosscorrelation analysis of the data recorded by the gravitational wave (g.w.) resonant detectors Explorer and Nautilus, performed to obtain information on the g.w. stochastic background. We found that the quantity [FORMULA], that measures the closure of the Universe, is [FORMULA], at 907.20 [FORMULA] Hz, where the factor 10 is obtained by the crosscorrelation analysis and the factor 6 takes into account the distance ([FORMULA] km) between Explorer and Nautilus. This is the first experiment where the data of two g.w. cryogenic resonant detectors are crosscorrelated.

Key words: gravitation – methods: data analysis – cosmology: early Universe

Send offprint requests to: Prof. Giovanni Vittorio Pallottino (pallottino@roma1.infn.it)

© European Southern Observatory (ESO) 1999

Online publication: November 16, 1999