Induced Gravitational Waves from Non-attractor Inflation and NANOGrav data

• Amin Nassiriraad (School of Astronomy, IPM)

In this seminar, I will discuss scalar-induced gravitational waves within the context of single-field non-attractor inflation, focusing on their implications for the Pulsar Timing Arrays data. The model under consideration encompasses three distinct phases of inflation: the first and third phases correspond to slow-roll inflation, while the second phase represents a period of non-attractor inflation. I will present the model's predictions for different values of the sound speed and explore its implications for NANOGrav observations as well as future gravitational wave detection. Join me as we delve into the intriguing world of scalar-induced gravitational waves and their significance in our understanding of the early universe.