Description
In June 2023, the International Pulsar Timing Array (IPTA) collaboration, comprising the European Pulsar Timing Array (EPTA), the Indian Pulsar Timing Array (InPTA), NANOGrav, and the Parkes Pulsar Timing Array (PPTA), simultaneously announced the first compelling evidence of the very-low-frequency (nHz) gravitational wave background. This result was followed by a detailed comparative analysis at the IPTA level, enhancing the robustness of the results by demonstrating consistency, accounting for the differences across data sets and noise models. In this presentation, I will review these different results and outline the key challenges faced by the EPTA in further optimizing sensitivity and resolving specific peculiarities in our results. Additionally, I will discuss the upcoming Third Data Release of the IPTA, exploring its potential to detect nano-Hertz gravitational waves, and will highlight the complexities involved in interpreting a measured signal with Pulsar Timing Arrays.
