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From: ethan@utastro.UUCP (Ethan Vishniac)
Newsgroups: net.books,net.sf-lovers,net.physics
Subject: Re: Procyon's Promise & antimatter black holes
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Date: Fri, 9-Aug-85 15:07:44 EDT
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Posted: Fri Aug  9 15:07:44 1985
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[]
A few comments about Black Holes.

First, when people make comments about all BH's being alike no matter what
they are made of, they are referring to their effects on the rest of the
universe.  Since physics as we know it breaks down near the center of
a BH people normally refrain from making comments about life inside a
BH.  Not only is the gravitational field of an BH made from anti-matter
identical to one made from matter, but when BH's evaporate due to quantum
mechanical processes, they emit equal amounts of matter and anti-matter
*no matter what they were originally made of*.

Second, when people talk about fitting the universe inside a BH they are
not talking about conventional physics.  The theory of GR says that in the
center of a BH a singularity forms in one spot and continues for all future
times (although what happens as the BH evaporates is not clear).  Models
of the universe (the successful ones) have a singularity at one time over
all of space.

Third, for quantum mechanical reasons no BH can be smaller than 10^-5 grams
in weight.  In fact, a BH weighing a metric ton would evaporate in
about 10^-10 seconds (the lifetime is proportional to the mass cubed).
Therefore it is probably nonsensical to talk about BH's the mass of a
subatomic particle.
-- 
"Support the revolution        Ethan Vishniac
 in Latin America...           {charm,ut-sally,ut-ngp,noao}!utastro!ethan
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                               Department of Astronomy
                               University of Texas