Re: Black holes radiate - the end of GR is there


"Tom Roberts" wrote
> MP wrote:
> > "Tom Roberts" <tjroberts@xxxxxxxxxx> wrote:
> >>The presence of a black hole has implications on the nearby
> >>structure of spacetime that cannot be imitated by any other reasonable
> >>astronomical object.
> >
> > This is quite a radical claim.
>
> No, it's not. perhaps you need to read the literature and become
> familiar with the subject.
>

This is quite a disappointing answer, in many ways.

See for instance Abramovicz

A&A 396, L31-L34 (2002)

>
> > What do you mean by reasonable astronomical object?
>
> One that standard astrophysical models can describe.
>

So only what is accepted as standard *today* is reasonable
in your opinion? I wonder, how physics is going to progress
with such an attitude...

> > Can this be defined in a precise way so that the above
> > statement can be checked?
>
> Astrophysicists _HAVE_ checked it.
>

Have checked what ? That *only* their standard models are
reasonable? That no other model or solution of the field equations
ever to be found in the future will be able to describe the
observed phenomena better?

> Standard astrophysical models do not contain objects small enough to be
> confused with a black hole. That is, while one might think there could
> be very dense objects that look like black holes from afar, in actuality
> astrophysicists don't have a model that could explain such objects.
>

Then Mazur, Mottola, Visser, Abramovicz, Bilic, Dymnikova, Mathur,
just to name a few, are not (astro)physicists ? Tom, you really can do
much much better than this!

Given, that you are one of the (few) people in this group
who has a rather decent grasp on GR, I would appreciate
if future answers focus on the physics and not on personal
issues, such as "perhaps you need to read the literature and become
familiar with the subject". I am not interested in discussions on this
level, although I realize that this appears to be the common practice
in this group.

MP
.

Relevant Pages

  • Re: Is the black holes spin holding it up?
    ... Inside a Schwarzschild black hole the singularity is in the ... >>> Tom Roberts tjroberts@xxxxxxxxxx ... Hitting the black hole is much more difficult than ...
    (sci.physics.relativity)
  • Re: THERE ARE NO BLACK HOLES!!!
    ... Tom Roberts wrote: ... for a solar mass black hole the evaporation time is on ... so no evaporation will even start until the entire ... CMBR throughout the universe is sucked in. ...
    (sci.physics.relativity)
  • Re: Can current theory explain the twin paradox?
    ... |> ROFL ... | Tom Roberts tjroberts@xxxxxxxxxx ... Don't forget the accretion disk you OBSERVED near the black hole, ... That's bullet proof, right? ...
    (sci.physics.relativity)
  • Re: Black holes radiate - the end of GR is there
    ... structure of spacetime that cannot be imitated by any other reasonable astronomical object. ... Standard astrophysical models do not contain objects small enough to be confused with a black hole. ...
    (sci.physics.relativity)