Re: value of g in black holes

[Jack Uretsky <jlu@HEP.ANL.GOV>]

Hi John-
        I repeat, now that you seem to be on the verge of seeing the
light (or, perhaps, the black), what is the escape velocity from just
inside of the event horizon?
                                Regards,
                                        Jack


On Thu, 18 Oct 2001, John Mallinckrodt wrote:

> On Thu, 18 Oct 2001, Vic Decarlo wrote:
>
> >     Perhaps John M., in speaking of a "completely
> > negligible" value of g at the event horizon of a very
> > massive black hole, is referring to relative tidal
> > accelerations for an  observer radially plunging into
> > the black hole.
>
> Yes and no.  Although the tidal accelerations at the event horizon
> clearly do diminish to negligible levels as M approaches the mass
> of the universe, I was being more naive than that and using the
> same sort of nonrelativistic--and, therefore, likely
> incorrect--analysis that Carl Mungan had put forth and disclaimed.
> I should have indicated my own discomfort with the analysis as
> well since I'm not even sure how to interpret the concept of "g"
> at an event horizon for reasons that were alluded to by Jack
> Uretsky in his post.  After all the value of g is normally
> associated with observations that would be made by a "stationary"
> observer--i.e., one who stays at constant R.
>
> At any rate I am not surprised to learn that the relativistically
> correct value diverges as one approaches the event horizon
> regardless of M.  I do wish, however, that I understood a little
> better what that *meant*!
>
> John Mallinckrodt      mailto:ajm@csupomona.edu
> Cal Poly Pomona          http://www.csupomona.edu/~ajm

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