The slippery slope of reality.

  Amazon review of   
  Marcus Chowns "We need to talk about kelvin".

  January 3rd 2010 - Simon Laub.


  The slippery slope of reality.     
 -----------------------------------

  Barack Obama started his "Dreams from my father" with a
quote from Chronicles (29:15):" For we are strangers before them,
and sojourners, as were all our fathers".
Reading Marcus Chowns "We need to talk about Kelvin"
easily brings you to the same state of mind.

  For starters: We are ghosts! 99.999999 per cent of
matter is empty space. Not only are the atoms 
we are made of, very, very tiny indeed. The atoms themselves
are mostly nothingness circling more nothingness.

  And what little substance there is to matter
soon evaporates when you realize that all
of the atoms, that make up 'you', are quantum things -
endowed with quantum weirdness - or madness if you like!
Take quantum entanglement: Particles
born together behaves as though they know about each other,
no matter how far apart. Communicating with each other,
somehow, at infinite speed. With
everything born 13.7 billion years ago 
in the fireball of the Big Bang - One can speculate that
everything in the universe is now bound together,
i.e. everything knows about everything else in the universe,
through some infinite speed communication process. 

  When we stand on the Earth, solid ground (ha ha), 
our weight compresses atoms below, squeezing electrons
in atoms closer to the nuclei. According to Heisenberg,
electrons aren't too crazy about having their position 
exposed. So they resist by gaining a higher momentum.
Fighting the compression so to speak. The 'solidity'
of the ground is Heisenbergs uncertainty principle kicking in:
The more sure we are of the location of a particle,
the less we can know about its momentum.
The 'solidity' of the ground is teaching us that there are limits
to what we can know about the world so to speak.

  Most things we know from our everyday world are not
identical. They may look indistinguishable, but when we
look closer, at a detailed molecular level, they are not. 
Not so with electrons - everyone out there in the
universe is absolutely identical. There is no way to tell
them apart. And likewise for quarks.
It follows that they have no inner structure, which would have
allowed us to tell them apart. 
So they are just weird to begin with, not weird due to otherwise
rational inner parts.

  The (weird) parts, we are made of, have been processed
in stars before they became parts of humans. Take iron.
A massive star develops an onion like interior,
with heavier and heavier elements closer to its core.
Finally the star undergoes a silicon burning phase which creates iron.
which is bad news for the star, as burning iron doesnt
give more energy, it takes energy. Without energy
being produced, there is nothing to oppose gravity from
collapsing the star. Which eventually leads to a collapse, followed 
by a cataclysmic explosion of the star, that for a short time,
outshine an entire galaxy of a 100 billion stars.
Sending out the iron that will eventually end up in the bodies
of humans.

  Looking out in the night sky, we can of course see many stars.
Actually, in an infinite universe, the night sky should be
completely bright with starlight, coming from stars
in all directions in an endless universe. But it
is not (Olbers paradox). 
Ok, the universe is to young for stars to have had time to
fill it up with light, and actually, the stars
dont have the energy to fill up the entire universe,
no matter how powerful they appear.

  The universe is a pretty big place!
It wasnt always. Way back at the Big Bang
it was small. And small tends to be synonymous with Quantum.
Yet, our everyday world doesnt seem to be 
quantum weird. So, how did the world loose its
quantumness? 
For matter there might be an answer. Here the clustering
of matter into big things like galaxies and people
might have caused the decoherence. 
The quantum waves representing the particles (that allows them to 
be quantum weird, i.e. in many places at the same time), interact
and 'decides' to be real, instead of ghostly quantum,
when particles come together in large amounts.

  But space time itself - why did that decide to
be relatively smooth, instead of totally chaotic quantum? 
No one knows.

  Marcus Chown doesn't go into (in this book) what a
quantum world actually means for our consciousness. 
Are our minds being flipped around according
to 'ghostly influences' by the rest of the universe? -
or better still, are our minds flipping the rest of universe
around according to our thinking?
At the very least, surely the fact that our minds live in a quantum
world, should mean something?

  Surely, the quantum effects are everywhere! Perhaps small,  
but as the universe is infinite, things tend to sum up...
And the effects then becomes large enough to make everything truly mind boggling.
  E.g. It is very unlikely, but eventually, everything can be produced
in spacetime out of 'thin air' and random quantum processes.
Lego bricks, cars, spaceships and brains.
And with an infinite amount of space-time it
is a certainty that these things will eventually
be produced. Including 'Boltzmann brains'!
Actually, 'Boltzmann brains' will outnumber other 'real' brains, like
human brains, that have been build by evolution over
billions of years.

  So, Boltzmann brains will sit out there in the utter emptyness
of space - and stare out into the nothingness... 
Indeed, they are, and will be, the typical observers in our universe?!

  The Boltzmann brains might not be communicating
with us. Apparently noone is! Which is strange according
to the Fermi paradox.... 
  Ok, Apart from the Boltzmann brains,
it might be that the galaxy is a galaxy of dolphins,
that are happy swimming around in alien seas. Without a need or
capacity to communicate.
Or maybe communication is extremely dangerous,
with killer species out there in deep space.
Or maybe it is just very hard to reach
a technological civilisation
(The five steps that made us - a) advent of bacteria b)
complex cells with nuclei c) multicellular life
d) intelligence e) human civilisation - each took
some 800 million years)

  Or perhaps is it much better to make
your own simulation of the whole thing 
at your own home planet. Complete with humans
and dinosaurs in it (as Stephen Wolfram
has suggested). Perhaps everything - everything -
can be generated by a computer program!
 
  Reality it might not be. But who knows about 
reality anyway?

-Simon 


January 3rd 2010

Simon Laub

www.simonlaub.net