The gravitational-lensing tag has no wiki summary.
0
votes
1answer
34 views
Is weak lensing the statistical effect of microlensing?
I am looking into the effects of gravitational lensing of gravitational waves. I know that gravitons travel along null geodesics, just as photons, and so they will suffer the same deflection angle by ...
4
votes
1answer
92 views
Liouville's theorem and gravitationally deflected lightpaths
It is customary in gravitational lensing problems, to project both the background source and the deflecting mass (e.g. a background quasar, and a foreground galaxy acting as a lens) in a plane.
Then, ...
3
votes
1answer
84 views
Are different frequencies of light lensed differently during gravitational lensing a bit like refraction?
So I was wondering about the event horizon on a black hole. And wondering if the point of no return for radio waves vs gamma rays would be different. I guess the logic being, since gamma rays have ...
0
votes
0answers
86 views
Should we really be worried about the Fermi paradox? [closed]
People use the term great silence to denote the so called absence of communications from other civilizations
But such silence is assuming civilizations will broadcast their signals more or less ...
10
votes
1answer
131 views
The transit of Venus and solar neutrino rates
The following question was posed at the end of Maury Goodman's June 2012 long-baseline neutrino newsletter.
During the Venus transit of the sun, were more solar neutrinos
absorbed in Venus, or ...
4
votes
3answers
432 views
Gravitational lensing or cloud refraction?
My current understanding of gravitational lensing follows
When a star or other massive body passes between us and another star, the phenomenon
generally labeled 'gravitational lensing' occurs. The ...
