String cosmology models predict a cosmic background of gravitational waves
produced during a period of dilaton-driven inflation. I describe the backgr
ound, present astrophysical and cosmological bounds on it, and discuss in s
ome detail how it may be possible to detect it with large operating and pla
nned gravitational wave detectors. The possible use of smaller detectors is
outlined. (C) 1999 Elsevier Science Ltd. All rights reserved.