Neil Turok
speaker
2,693 appearances
2 recordings
1 series
first heard Apr 2025
last heard 22 Jun
Neil Turok’s voice in public audio — every appearance, attributed to the second.
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Appearances
This method is a four by four matrix.
And one of the axioms is that it must be invertible.
You you must be able to write down the metric and its matrix inverse.
Um it turns out that in this coordinate system we are using and which Einstein used before us, Einstein and Rosen used before us, the metric fails to be invertible.
Exactly on the horizon.
So uh it's completely analytic, meaning it solves the field equations, but this one axiom breaks down on the horizon.
So we would say we have a type of singularity.
It's i in the conventional sense of GR.
You can't only use conventional GR to make sense of this.
But it's much milder than the singularity you would otherwise have.
If you took the inside seriously.
So in other words, we found another way uh we found a way of avoiding
All curvature singularities in black holes.
Which involves accepting another kind of singularity.
Um, which is this i essentially what happens is the metric is not invertible on this surface.
Now is that uh catastrophe that the metric is not invertible?
No, by by no means.
Uh there's nothing, you know, God given that says that um the geometrical description you you see essentially the idea that the metric is invertible is
can be phrased um much simpler by saying that locally
In space time, if I use a magnifying glass, uh and I zoom in as much as I can, then locally the space-time just look looks like flat Minkowski space.
Showing 1161–1180 of 2,693 · page 59 of 135
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