A team of scientists has announced that they have detected direct evidence for one of the key elements of the inflationary model of the universe, that there was a rapid rate of expansion soon after ‘the beginning’, i.e., at times shortly after t=0. They did this by using a radiotelescope located at the South Pole called BICEP2, looking for signs of the imprint in the cosmic microwave background caused by gravitational waves triggered by the event.
The journal Nature provides basic information about the announcement and gravitational waves and how they were detected, and provides the helpful video below. In addition to providing evidence of inflation, it also provides indirect evidence for the existence of gravitational waves. There are currently experiments to look for direct evidence of such waves.