Primordial Gravitational Waves

Primordial gravitational waves are ripples in spacetime created during the universe's earliest moments, specifically right after the Big Bang. These waves are similar to ripples on a pond but occur in the fabric of space and time itself. They carry information about the universe's initial conditions and the rapid expansion called inflation. Detecting these waves can provide crucial insights into how the universe began and the fundamental physics involved, essentially acting as a record of the universe’s birth story written in the geometry of spacetime.