Portrait of Alan Guth
. Betsy Devine (Betsythedevine); Trinity College, Cambridge, 19 December 2007; existing crop from her Flickr photograph 2123046495. CC BY-SA 3.0, via Wikimedia Commons. Source. Articles by others on the same topic
Alan Guth is an American theoretical physicist and cosmologist best known for proposing the theory of cosmic inflation. This theory suggests that the universe underwent an exponential expansion during the first few moments after the Big Bang, which helps explain several observed phenomena in cosmology, such as the uniformity of the cosmic microwave background radiation and the large-scale structure of the universe.