On 7/24/2020 4:13 PM, Lawrence Crowell wrote:
On Friday, July 24, 2020 at 1:46:54 PM UTC-5 [email protected] wrote:
On Friday, July 24, 2020 at 4:38:20 AM UTC-6, Lawrence Crowell wrote:
On Thursday, July 23, 2020 at 10:03:36 PM UTC-5
[email protected] wrote:
If such a theory could be constructed, it would have
particles to manifest excited states, called gravitons.
But for a BH, gravitons generated by its mass couldn't
escape, so they couldn't function as force carrying
particles as in other quantum field theories. We'd still
need Einstein's GR to account for the gravitational
"force" via curvature of space-time. So what would a
quantum theory of gravity buy us? Why do we need it? AG
The way you state this illustrates considerable confusion and
in these threads I and others have indicated how to think of
this. This does not involve gravitons coming out of black
holes. You have repeated this error a number of times.
What error are you referring to? I was just POSTULATING that IF a
quantum theory of gravity is possible, gravitons would exist but
couldn't escape a BH and thus couldn't function as force carrying
particles analogous to photons for QED. We'd still need Einstein's
theory of gravity based on curvature of space-time to explain the
gravity field external to a BH. So what would be gained from such
a quantum theory? I have no problem with gravitons existing in a
weak field approximation of GR, and this being a linear quantum
theory. AG
It is not the case that gravitons come out of a black hole to
intermediate a force between it and some other mass. From the
perspective of an exterior observer all mass-energy and quantum fields
that make up a black hole are on the event horizon or just above. This
is why I got into the whole Tortoise coordinates and so forth. I will
have to leave it here I think.
LC
Besides that, the static field is mediated by virtual gravitons...which
can travel back in time, if you were trying do a Feynman diagram of
gravitational attraction.
Brent
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