Could dark matter have been forged in a 'Dark Big Bang?'
https://www.space.com/second-big-bang-second-dark-matter
Are planet-killing black holes hiding inside your cat?
https://www.space.com/primordial-black-holes-cat-big-bang
Could dark matter have been forged in a 'Dark Big Bang?'
https://www.space.com/second-big-bang-second-dark-matter
Are planet-killing black holes hiding inside your cat?
https://www.space.com/primordial-black-holes-cat-big-bang
On 12/4/24 11:57, Jan Panteltje wrote:
Could dark matter have been forged in a 'Dark Big Bang?'
https://www.space.com/second-big-bang-second-dark-matter
Are planet-killing black holes hiding inside your cat?
https://www.space.com/primordial-black-holes-cat-big-bang
Hollow out the earth? Preposterous! No cavity can persist
in the core of an object big enough to be drawn into the
shape of a sphere under its own gravity.
Tiny black holes that would drill microscopic tunnels
through matter wouldn't go unnoticed. I think they don't
exist. For that matter, I think black holes, in the sense
of gravitational singularities, don't exist either, for
the simple reason that their mass energy, even though huge,
is not infinite.
If a theory predicts a singularity, this merely tells us
the theory is incomplete.
On 12/4/24 11:57, Jan Panteltje wrote:
Could dark matter have been forged in a 'Dark Big Bang?'
https://www.space.com/second-big-bang-second-dark-matter
Are planet-killing black holes hiding inside your cat?
https://www.space.com/primordial-black-holes-cat-big-bang
Hollow out the earth? Preposterous! No cavity can persist
in the core of an object big enough to be drawn into the
shape of a sphere under its own gravity.
Tiny black holes that would drill microscopic tunnels
through matter wouldn't go unnoticed. I think they don't
exist. For that matter, I think black holes, in the sense
of gravitational singularities, don't exist either, for
the simple reason that their mass energy, even though huge,
is not infinite.
If a theory predicts a singularity, this merely tells us
the theory is incomplete.
On 04/12/2024 11:54, Jeroen Belleman wrote:
On 12/4/24 11:57, Jan Panteltje wrote:
Could dark matter have been forged in a 'Dark Big Bang?'
https://www.space.com/second-big-bang-second-dark-matter
Are planet-killing black holes hiding inside your cat?
https://www.space.com/primordial-black-holes-cat-big-bang
Hollow out the earth? Preposterous! No cavity can persist
in the core of an object big enough to be drawn into the
shape of a sphere under its own gravity.
Tiny black holes that would drill microscopic tunnels
through matter wouldn't go unnoticed. I think they don't
exist. For that matter, I think black holes, in the sense
of gravitational singularities, don't exist either, for
the simple reason that their mass energy, even though huge,
is not infinite.
Indeed. It is possible that small sized black holes do account for some
of the missing matter but you can't hide them so easily. If they were
too low a mass they will already have evaporated by now from Hawking radiation. If there were a range of masse sthere should be some around evaporating right now and they would have a particular signature that GR
can predict.
It is just possible that the next generation supercolliders might be
powerful enough to momentarily create nano BH objects once in a
bluemoon. Hyper energetic cosmic rays might do this too but their decay products are impossible to observe.
If a theory predicts a singularity, this merely tells us
the theory is incomplete.
The theory could be complete if it only posits singularities in places
where you can never observe them and report your findings. With the
possible sole exception of a maximal angular momentum Kerr metric I
think that Penrose's cosmic censorship conjecture holds.
https://en.wikipedia.org/wiki/Cosmic_censorship_hypothesis
I don't know how strongly supported it is these days.
On 12/5/24 10:34, Martin Brown wrote:
On 04/12/2024 11:54, Jeroen Belleman wrote:
If a theory predicts a singularity, this merely tells us
the theory is incomplete.
The theory could be complete if it only posits singularities in places
where you can never observe them and report your findings. With the
possible sole exception of a maximal angular momentum Kerr metric I
think that Penrose's cosmic censorship conjecture holds.
https://en.wikipedia.org/wiki/Cosmic_censorship_hypothesis
I don't know how strongly supported it is these days.
It's a philosophical issue rather than a scientific one, but I
hold that a science will have ceased to be one when it accepts
things by declaring them unobservable. They might as well
postulate the existence of fairies.
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