Seminar: “Lyth Bound and Swampland Distance Conjecture Constrain Inflation Model”

Speaker: Yuma S. Furuta, Japan
Date: October 23, 2025, 11:00
Venue: FTMC, Room D401

It was once believed that the Universe began with a single explosive event — the Big Bang. However, this picture faces several theoretical issues, such as the horizon and flatness problems. A widely accepted solution is the inflationary phase, during which spacetime underwent exponential expansion in the early Universe.

Although various mechanisms for inflation have been proposed, their exact nature remains uncertain, and understanding them is essential for uncovering the origin of the Universe. In this talk, Yuma S. Furuta will discuss how the Swampland Distance Conjecture and the Lyth Bound impose theoretical constraints on inflation models, offering a concrete framework for evaluating their viability.

The two bounds play complementary roles in testing inflationary scenarios. Interestingly, the Swampland Distance Conjecture alone can impose stronger upper limits on the tensor-to-scalar ratio than current observational constraints from the cosmic microwave background.

Everyone is welcome to attend!