Questions tagged [microlensing]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
10
votes
1answer
2k views

Can the Earth be used as a gravitational lens?

Could the Earth be used as a gravitational lens to image very far distances with an effective aperture that would be far greater than any telescope? How far away from Earth would an observing ...
4
votes
2answers
84 views

Time vs magnification in a binary lens

For a single lens: we got \begin{equation} u(t)=\sqrt{\left(\frac{t-t_0}{t_E}\right)^2 + u_0^2},\end{equation} so the magnification is \begin{equation} A = \frac{u^2+2}{u\sqrt{u^2+4}} \end{...
0
votes
0answers
40 views

Primordial black holes microlensing

Could the movement of a PBH found in the outer solar system by microlensing be totally unpredictable and impossible to track after it was first detected?
1
vote
1answer
43 views

How are microlensing events used to constrain the size of innermost stable circular orbits around spinning black holes?

The third paragraph of the introduction to the ArXiv preprint Constraining Quasar Relativistic Reflection Regions and Spins with Microlensing says: Quasar microlensing has significantly improved ...