Speaker
Description
The angular correlation of pulsar residuals observed by NANOGrav and other pulsar timing array (PTA) collaborations show evidence in support of the Hellings-Downs correlation expected from stochastic gravitational wave background (SGWB).
In this talk, I will give a non-gravitational wave explanation of the observed pulsar timing correlations as caused by an ultra-light gauge boson dark matter (ULDM). In this scenario, the oscillations of the pulsars are due to their interaction with a ULDM background. Apart from the time delay due to this oscillation, there is an associated Doppler time delay as the signal approaches the earth. Finally, I will demonstrate a comparative analysis between our ULDM scenario, and the stochastic gravitational wave background (SGWB), as well as the SGWB with Shapiro time delay hypotheses.
