black holes maybe bending light the wrong way

ladies and gents,
an effect called negative refraction may have an effect on gravitational lensing.
stephen.

www.nature.com/news/2005/050214/full/050214-5.html

Hmm ... this is some wiered shit!

Wonder what is causing the negative Refraction?

Bart.

Hmm ... this is some wiered shit!

Wonder what is causing the negative Refraction?

Bart.

Hi Bart,

The article indicates that it is a property of the gravitational field of rotating black holes and massive rotating stars. I wonder if it is something to do with rotating objects dragging their local frame of reference round, although I have to admit that my understanding of relativity is not profound.

Simon