Inflation's Lingering Impact on the Cosmos

Scientists from the Chinese Academy of Science have analyzed 15 years of pulsar timing data from the NANOGrav observatory to study the physics of the early universe. They found that the data supports the existence of ultra-slow-roll inflation, a type of inflation that produced clumped matter and is responsible for the stochastic gravitational wave background (SGWB) signals observed by pulsar timing arrays. This finding provides insights into the origins of gravitational waves and opens the door for further research in understanding the new physics of the cosmos.