title: Measuring a parity-violation signature in the early universe via ground-based laser interferometers.
abstract: We show that pairs of widely separated interferometers are advantageous for measuring the Stokes parameter V of a stochastic background of gravitational waves. This parameter characterizes asymmetry of amplitudes of right- and left-handed waves, and generation of the asymmetry is closely related to parity violation in the early universe. The advantageous pairs include the kilometer-size interferometers LIGO (Livingston)-LCGT and AIGO-Virgo, which are relatively insensitive to Omega(GW) (the simple intensity of the background). Using at least three detectors, information of the intensity Omega(GW) and the degree of asymmetry V can be separately measured.
authors.affiliation: National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Seto
authors.forename: Atsushi
authors.initials: A
authors.lastname: Taruya