Some applications of the Shapiro time delay

TL;DR

This paper explores how the Shapiro time delay can be used to differentiate between types of singularities, detect rotation of celestial objects, and analyze gravitational fields, enhancing our understanding of spacetime structures.

Contribution

It discusses novel applications of the Shapiro time delay in distinguishing naked singularities from black holes and inferring object rotation.

Findings

Shapiro delay can distinguish naked singularities from black holes.

Time delay measurements may reveal object rotation.

Different singularity types may be characterized by their time delay signatures.

Abstract

Listening to echoes has long been a way to estimate distances, a technique whose backbone is the time delay. The gravitational field also creates a time delay, called Shapiro time delay, that helps us extract some information from the field and is indeed due to the photon journey through the field. Here, the ability of the Shapiro effect to distinguish naked singularities from non-naked ones (black holes) is discussed. It is also inferred that this time delay may be hired to compare the various types of singularities with different dimensions. Besides them, the possibility of detecting the rotation of the assumed objects through surveying the gravitational time delay is also addressed.