| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
26 Jul 2005 04:48:03 AM |
| Object: |
Re: Hawkings new paper |
I took a quick look about Hawkings new paper.
As an amateur physicist I got at least following questions
to myself :
Q1. About Schwartzhild's black hole for example I think that it
is realy open question what is reasonable metric inside
the event horizon (I would not allow transformation r <--> t,
as what was used in Hawking's and Ellis' book large scale
structure of the space-time, but rather I would allow instead
at least for one case transformation t <--> -t, and it would
not be allowed to enter from time-like area (outer metric) to
space-like area, different type of vacuum !!!) ?
Q2. About charged or rotating black hole I think that these
types have singularity problems as pointed out for example in
Chancharechran's (please check name spelling) book
the theory of black holes
[naked singularity ?, ring sigularity ?, it is possible to
avoid hitting into the singularity when falling in,
also rotating back hole would also rotate the whole space if
it would be it possible to rotate, so these
types possibly does not exist at all (presently charge and angular
momentum could have accounted possibly wrong way into the metric ?,
how "radiation periphery" is taken into account ?) ] ?
Q3. Hawking radiation of the black hole does not possible
exist in present Universe due structure of "radiation periphery"
(this is roughly same as event horizon) ?
Q4. Radiation could be tunneling out from inside the
black hole is questionable as its existence (what is the metric
inside the event horizon ? How "radiation periphery" (this is
roughly same as event horizon)" is taken into account ?
How it is possible for radiation to have superluminal "velocity"
(v > c) in this case as if I have understood right it would be
required ?)
Q5. Possible good solution to the bet is at the end of the paper ?
Best Regards,
Hannu Poropudas
amateur physicist
Vesaisentie 9E,
90900 Kiiminki.
Finland.
050-5339808
email:
x= h
y= poropudas
Jim O'Reilly wrote:
Published at last -the paper on information loss.Can any of the experts
say if it holds up
[ Mod. note: The paper can be found at
http://arxiv.org/abs/hep-th/0507171
The abstract is:
Information Loss in Black Holes
Authors: S. W. Hawking
The question of whether information is lost in black holes is
investigated using Euclidean path integrals. The formation and
evaporation of black holes is regarded as a scattering problem with
all measurements being made at infinity. This seems to be well
formulated only in asymptotically AdS spacetimes. The path integral
over metrics with trivial topology is unitary and information
preserving. On the other hand, the path integral over metrics with
non-trivial topologies leads to correlation functions that decay to
zero. Thus at late times only the unitary information preserving
path integrals over trivial topologies will contribute. Elementary
quantum gravity interactions do not lose information or quantum
coherence.
-ik ]
--
Jim O'Reilly
.
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