Strong lensing interferometry for compact binaries

Abstract

We propose a possibility to improve the current precision measurements on compact binaries. When the orbital axis is almost perpendicular to our line of sight, a pulsar behind its companion can form two strong lensing images. These images cannot be resolved, but we can use multiwavelength interferometry to accurately determine the passage through superior conjunction. This method does not depend strongly on the stability of the pulse profile and applies equally well to both slow and fast pulsars. We discuss the possible improvement this can bring to the bound on stochastic gravitational wave background and to determine black hole spin. We also discuss the possibility of discovering a suitable binary system by the Square Kilometer Array to which our method can apply.

Memory effect from supernova neutrino shells

“…Nevertheless, one can measure it as an interference effect. The accuracy is then determined by the signal frequency, which can be much better than pulse-profile timing [3]. We provide a simple estimation to show that among the thousands of pulsars that SKA is supposed to discover [4], some of their lines-of-sight can be sufficiently close (∼ 10 light-years) to the next supernova.…”