On gravitational waves emitted by an ensemble of rotating neutron stars
  We study the possibility to detect the gravitational wave background generated by all the neutron stars in the Galaxy with only one gravitational wave interferometric detector. The proposed strategy consists in squaring the detector's output and searching for a sidereal modulation. The shape of the squared signal is computed for a disk and a halo distribution of neutron stars. The required noise stability of the interferometric detector is discussed. We argue that a possible population of old neutron stars, originating from a high stellar formation rate at the birth of the Galaxy and not emitting as radio pulsars, could be detected by the proposed technique in the low frequency range of interferometric experiments. 
A. Giazotto (INFN, Pisa, Italy), S. Bonazzola, E. Gourgoulhon (DARC,   CNRS, Observatoire de Paris, France)