Resolving the Hubble tension through diffraction of gravitational waves

Ue-Li Pen^1*

¹Asiaa, Academia Sinica, Taipei, Taiwan
²CITA, University of Toronto, Toronto, Canada

* Presenter:Ue-Li Pen, email:pen@asiaa.sinica.edu.tw

We describe diffractive lensing of gravitational waves by galaxies detected by pulsar timing arrays. In favorable situations this can lead to precision measurement of the Hubble constant. This effect is a consequence of complex lensing images described by Picard-Lefschetz theory. We describe the novel effect and it’s observational consequences.

Keywords: Gravitational Waves , Cosmology , Pulsar timing