Novel Physics with International Pulsar Timing Array: Axionlike Particles, Domain Walls and Cosmic Strings

Understand

After NANOGrav, the IPTA collaboration also reports a strong evidence of a stochastic gravitation wave background.

• This hint has very important implications for fundamental physics.
• With the recent IPTA data release two, we attempt to search signals of light new physics.
• and give new constraints on the audible axion, domain walls and cosmic strings models.