Showing posts with label physics. Show all posts
Showing posts with label physics. Show all posts

Monday, November 7, 2011

64. Got CHAOS? Excerpts from "Chaos: Making a New Science", by James Gleick

Excerptsfrom

"Chaos:
Making
a
New Science",

by
James Gleick,

Penguin Books,
1987


"Everything
was
very geometric
straight-line
approaches,"
said
Heinz-Otto Peitgen.
 
He was talking
about
modern art.
 
"The work of
Josef Albers,
for example,
trying
to
discover
the
relation of colors,
this
was
essentially
just
squares
of
different colors
put
onto
each other.
 
These things
were
very popular.


If you
look at it
now
it
seems
to
have passed.
 
People
don't
like it
any more."
(p. 229)
 
+++
 
A
movement
had begun,
and
the
discovery
of
universality
spurred it
forward.
 
In
the summer
of
1977,
two physicists,
Joseph Ford
and
Giulio Casati,
organized
the
first conference
on
a science
called
chaos.
 
It was held
in
a gracious villa
in
Como, Italy,
a tiny city
at
the southern foot
of
the lake
of
the
same name,
a
stunningly
deep blue
catchbasin
for
the
melting snow
from
the
Italian Alps.
 
One hundred
people
came --
mostly physicists,
but also
curious scientists
from
other fields.
 
"Mitch
had seen
universality
and
found out
how it
scaled
and
worked out
a way
of
getting to chaos
that was
intuitively appealing."
Ford said.
"It
was
the first time
we
had
a clear model
that
everybody
could understand.
 
"And
it was
one
of
those things
whose
time
had come.
 
In disciplines
from
astronomy
to
zoology,
people
were doing
the
same things,
publishing
in
their
narrow
disciplinary journals,
just
totally unaware
that
the
other people
were
around.
 
They
thought
they
were
by themselves,
and
they
were regarded
as
a bit eccentric
in
their own
areas.
 
They
had
exhausted
the
simple questions
you could ask
and
begun
to worry
about
phenomena
that were
a bit
more complicated.
 
And
these people
were
just
weepingly grateful
to
find out
that
everybody else
was
there,
too."
 
Later,
Feigenbaum
lived
in
a bare space,
a bed
in one room,
a computer
in another,
and,
in the third,
three
black electronic towers
for
playing
his
solidly Germanic
record collection.
 
His
one experiment
in
home furnishing,
the purchase
of
an expensive
marble coffee table
while
he was
in Italy,
had ended
in failure;
he received
a parcel
of
marble chips.
 
Piles of papers
and
books
lined the walls.
 
He talked
rapidly,
his
long hair,
gray now
mixed
with brown,
sweeping back
from
his forehead.
 
"Something dramatic
happened
in
the twenties.
 
For no good reason
physicists
stumbled upon
an
essentially correct
description
of
the
world around them --
because
the theory
of
quantum mechanics
is
in
some sense
essentially correct.
 
It tells you
how
you can take dirt
and
make computers
from it.
 
It's
the way
we've learned
to
manipulate
our
universe.
 
It's
the way
chemicals
are made
and
plastics
and
what not.
 
One
knows
how
to
compute
with it.
 
It's
an
extravagantly good
theory --
except
at some level
it
doesn't make
good sense.
 
Some
part
of
the imagery
is
missing.
 
If you ask
what
the equations
really mean
and
what is
the description
of
the world
according to
this theory,
it's
not a description
that
entails
your intuition
of
the world.
 
You
can't think
of
a particle
moving
as though
it has
a
trajectory.
 
You're
not allowed
to
visualize it
that way.
 
If you start
asking
more and more
subtle
questions --
what does
this theory
tell you
the
world
looks like? --
in the end
it's
so far out
of
your
normal way
of
picturing things
that
you
run into
all sorts
of
conflicts.
 
Now
maybe
that's
the way
the world
really is.
 
But
you don't
really know
that
there
isn't
another way
of
assembling
all this
information
that
doesn't
demand
so radical
a departure
from
the way
in which
you
intuit things.
 
There's a
fundamental
presumption
in
physics
that
the way
you understand
the world
is
that
you
keep isolating
its ingredients
until
you understand
the
stuff
that
you think
is
truly fundamental.
 
Then
you presume
that
the
other things
you
don't understand
are
details.
 
The assumption
is
that
there are
a small number
of
principles
that
you
can discern
by
looking at things
in
their pure state --
this
is
the true
analytic notion --
and
then
somehow
you
put these together
in
more complicated ways
when
you
want
to
solve
more dirty
problems.
 
If
you
can.
 
In
the end,
to
understand
you
have
to
change gears.
 
You
have
to
reassemble
how
you conceive
of
the
important things
that
are
going on.
 
You
could have
tried
to
simulate
a
model fluid system
on
a computer.
 
It's
just
beginning
to
be
possible.
 
But
it
would
have been
a
waste
of
effort,
because
what
really
happens
has
nothing to do
with
a fluid
or
a
particular equation.
 
It's
a
general description
of
what happens
in
a
large variety
of
systems
when
things
work
on themselves
again
and again.
 
It requires
a
different way
of
thinking
about
the
problem.
 
When you
look
at this room --
you see
junk
sitting over there
and
a person
sitting
over here
and
doors
over there --
you're
supposed
to take
the
elementary principles
of
matter
and
write down
the
wave functions
to
describe them.
 
Well,
this
is
not
a
feasible
thought.
 
Maybe
God
could do it,
but
no analytic thought
exists
for
understanding
such a problem.
 
It's
not
an
academic question
any more
to ask
what's
going
to happen
to
a cloud.
 
People
very much
want
to know --
and
that means
there's
money
available
for it.
 
That problem
is
very much
within
the realm
of
physics
and
it's a problem
very much
of
the
same caliber.
 
You're looking at
something
complicated,
and
the present way
of
solving it
is
to
try
to
look at
as many points
as
you can,
enough stuff
to
say
where
the cloud is,
where
the warm air is,
what
its velocity is,
and
so forth.
 
Then
you
stick it
into
the
biggest machine
you can afford
and
you
try to get
an estimate
of
what
it's going to do
next.
 
But
this
is
not
very
realistic."
 
He
stubbed out
one cigarette
and
lit another.
 
"One
has
to look
for
different ways.
 
One
has
to look
for
scaling structures --
how
do
big details
relate
to
little details.
 
You look
at
fluid disturbances,
complicated structures
in which
the complexity
has
come about
by
a
persistent process.
 
At some level
they
don't care
very much
what
the size
of
the process
is --
it
could be
the size
of
a
pea
or
the size
of
a
basketball.
 
The process
doesn't care
where
it is,
and
moreover
it doesn't care
how long
it's
been going.
 
The
only things
that
can ever
be
universal,
in a sense,
are
scaling
things.
 
In a way,
art
is
a theory
about
the way
the world
looks
to
human beings.
 
It's
abundantly
obvious
that
one
doesn't know
the world
around us
in
detail.
 
What
artists
have accomplished
is
realizing
that
there's
only
a small amount
of
stuff
that's important,
and then
seeing
what
it was.
 
So
they
can
do
some
of
my research
for
me.
 
When you look
at
early stuff
of
Van Gogh
there are
zillions
of
details
that
are
put into it,
there's
always
an
immense amount
of
information
in
his paintings.
 
It
obviously
occurred
to him,
what
is
the
irreducible amount
of
this stuff
that
you
have to
put in.
 
Or
you
can study
the horizons
in
Dutch ink drawings
from
around 1600,
with
tiny trees
and
cows
that
look very real.
 
If you
look closely,
the trees
have
sort of
leafy boundaries,
but
it
doesn't work
if
that is
all it is --
there are also,
sticking in it,
little pieces
of
twig-like stuff.
 
There's
a
definite interplay
between
the
softer textures
and
the things
with
more
definite lines.
 
Somehow
the
combination
gives
the
correct perception.
 
With
Ruysdael
and
Turner,
if you
look
at
the way
they
construct
complicated water,
it is
clearly
done
in
an
iterative way.
 
There's
some level
of
stuff,
and then
stuff
painted
on top of that,
and
then
corrections
to that.
 
Turbulent
fluids
for
those painters
is
always
something
with
a scale idea
in
it.
 
I
truly
do
want to know
how
to
describe clouds.
 
But
to say
there's a piece
over here
with
that much density,
and
next to it
a piece
with
this much density --
to
accumulate
that much
detailed information,
I think
is
wrong.
 
It's
certainly not
how
a human being
perceives
those things,
and
it's
not how
an
artist
perceives them.
 
Somewhere
the
business
of
writing down
partial
differential equations
is
not
to
have
done
the work
on
the problem.
 
Somehow
the
wondrous promise
of
the earth
is
that
there
are things
beautiful
in it,
things
wondrous
and
alluring,
and
by virtue
of
your trade
you
want
to
understand them."
 
He
put
the
cigarette
down.
 
Smoke
rose
from
the ashtray,
first
in
a
thin column
and
then
(with
a nod
to
universality)
in
broken tendrils
that
swirled
upward
to
the
ceiling.
 
[From pages  184 - 187]
 
+++

Wednesday, October 19, 2011

29. "Mathematics: Dreams and Nightmares", Bertrand Russell, Albert Einstein, Heinz Pagels, Fred Allen Wolf, Bob Toben and Science AT THE EDGE

Selected Excerpts from "Space-Time and Beyond:
Toward an Explanation
of the Unexplainable",
the New Edition,
by Bob Toben
and Fred Alan Wolf,
Bantum books, 1982,
p. 129 - 130.
 
"How
does
the universe
do
it?
 
How
does it
produce
anything
at
all?
 
No one
really
knows
the answer.
 
However,
we do know
that the
self-reference
is an important part
of
the process.
 
The way that it works
in quantum physics,
which underlies
all
of the physical world,
is that
the
quantum wave
flows
between
two events
just like
a river
leaving
a source
and
flowing
to
a sink.
 
But
then
it
'turns around'
in
space-time
and
flows
back
from the sink
to the source.
 
The resulting
reinforcement
between
the quantum wave
and its
space-time reflected
image
produces
the
experiences
we call
reality.
 
In the language
of quantum physics,
we say
that the wave
is
multiplied
by its
'complex-conjugated
self'
to produce
the
probabilities
of the
real world.
 
This
double-flow
process
occurs
in every
physical
phenomenon.
 
It is
in this manner
that we
have
self-organization;
self
exists
through
the wave
interacting
with its
space-time mirrored image
in
the same way
that
you
interact
with
your own
mirror image.
 
Did you
ever notice
that
in order to
notice
yourself
in
a mirror
you
have to
forget
yourself?
 
And
to forget yourself
you
have to
take note
of
yourself?
 
By
self-reflection
we
are able
to change
ourselves.
 
By
observing
ourselves
in
others
we
are able
to
change
each other.
 
All there is,
is
the one-verse,
the
universe
looking
at
itself
in
itself."
 
+++
 
Selections
from
"Russell:
Mathematics:
Dreams
and
Nightmares",
by
Ray Monk,
Phoenix Press,
1997
[on Bertrand Russell,
1872-1970]
 
"I had been told
that Euclid
proved things,
and
was much disappointed
that he started
with
axioms.
 
At first
I refused
to accept them
unless my brother
could offer me
some
reason
for doing so,
but he said,
'If you don't accept them
we cannot go on',
and
as I wished to go on,
I reluctantly
accepted them
pro tem.
 
The doubt
as to the
premises
of
mathematics
which I felt
at that moment
remained with me,
and determined
the course
of my
subsequent work."
[from "The Autobiography
of
Bertrand Russell
1972 - 1914",
1967, p. 36]
(p. 3 - 4)
 
"For both
Hobbes and Russell,
the
almost erotic delight
they took
in learning
Euclid's geometry
('as dazzling
as first love')
was
aroused
by
the feeling
of
finally
coming to know
something
with
complete certainty.
 
The beauty
of Euclid's system
is
that
it is axiomatic.
 
Everything
that it teaches
about circles,
triangles,
squares,
etc.
is not just stated
but
proved;
complicated
and
surprising things
about the relations
between
angles and lengths
and so on
are shown
to be
merely logical consequences
of a few,
simple axioms.
 
It's
as if a whole,
vast body
of knowledge
has been spun
out of
virtually nothing,
but,
more than that,
this body
of knowledge
is not tentative
or
provisional,
it
does not depend
upon
the contingencies
of
the world,
but rather
can be established
once
and for all.
 
If one accepts
the axioms,
one
has to accept
the rest;
no further doubt
is possible.
 
To someone who
wishes,
as Russell
passionately wished,
to find reasons
for their beliefs,
the exhilarating possibility
this opens up
is that
some beliefs
at least
can be provided
with
absolutely
cast-iron foundations."
(p. 4-5)
 
"... the experience
of discovering
a realm of truth
free from
the  vicissitudes
of human existence
was ecstatic
to Russell,
and
it inspired in him
a desire
to found all knowledge
upon
the kind of
rock-solid foundations
provided
by Euclid's
system of geometry."
(p. 6)
  
"I found
great delight
in mathematics --
much more delight,
in fact,
than in any other study.
 
I liked to think
of the applications
of mathematics
to the physical world,
and I hoped that
in time
there would be
a mathematics
of human behavior
as precise
as the mathematics
of machines.
 
I hoped this
because I liked
demonstrations,
and at most times
this motive
outweighed the desire,
which I also felt,
to believe in
free will."
[from
"Portraits  from Memory",
1956. p. 20]
(p. 6)
 
"Mathematics
is,
I believe,
the chief source
of the belief
in
eternal
and
exact
truth,
as well as
in
a super-sensible
intelligible
world.
 
Geometry
deals with
exact circles,
but
no sensible object
is exactly circular;
however carefully
we may use our compasses,
there will be
some
imperfections
and
irregularities.
 
This
suggests the view
that all exact reasoning
applies to
ideal
as opposed to sensible
objects;
it is natural
to go further,
and to argue
that
thought
is nobler
than sense,
and the
objects of thought
more real
than those
of
sense-perception."
[from "History
of Western Philosophy",
1991 p. 55 -56]
(p. 7)
 
"For a time
I found satisfaction
in a doctrine
derived, with modification,
from Plato.
 
According to
Plato's
doctrine,
which I accepted
only in a watered-down form,
there is
an unchanging
timeless
world
of ideas
of which
the world presented to our senses
is
an imperfect copy.
 
Mathematics,
according to this doctrine,
deals with the
world
of ideas
and has
in consequence
an
exactness
and
perfection
which is absent
from the everyday world.
 
This kind
of mathematical
mysticism,
which Plato
derived
from Pythagoras,
appealed to me."
[from
"Portraits from Memory",
1956, p. 22]
(p. 8)
 
"I disliked
the real world
and
sought refuge
in a timeless world,
without change
or decay
or
the
will-o'-the-wisp
of
progress."
[from "My
Philosophical Development",
1959, p. 210]
(p. 8)
 
"As Russell presents him,
Pythagoras
was both
a religious prophet
and
a pure mathematician:
'In both respects
he was
immeasurably influential,
and the two
were not so separate
as they seem
to a modern mind.'
 
Pythagoras's
religion,
according to Russell,
was
a reformed version
of Orphism,
which was, in turn,
a reformed version
of the worship
of Dionysus.
 
Central to all three
was the exaltation
of ecstasy,
but
in the cult of Pythagoras,
this ecstasy
is to be achieved
not by
drinking wine
or indulging
in sexual activity,
but rather
by the exercise
of the intellect.
 
The highest life,
on this view,
is that devoted to
'passionate sympathetic
contemplation',
which Russell
(following F. M. Cornford)
says
was
the original meaning
of
the word
'theory'."
(p. 9)
 
"For Pythagoras,
the passionate contemplation
was intellectual,
and issued
in mathematical knowledge.
 
In this way,
through
Pythagoreanism,
'theory'
gradually acquired
its
modern
meaning;
but for all who were inspired
by Pythagoras
it retained an element
of
ecstatic revelation.
 
To those who have reluctantly learnt
a little mathematics in school
this may seem strange;
but
to those
who have experienced
the intoxicating delight
of
sudden understanding
that mathematics gives,
from time to time,
to those who love it,
the Pythagoras view
will seem
completely natural,
even if untrue.
 
It might seem
that
the empirical philosopher
is
the slave
of his material,
but
the
pure mathematician,
like the musician,
is
a free creator
of his world
of
ordered beauty."
[from "History
of Western Philosophy",
1991 p. 52 -53]
(p. 9)
 
"Pythagoras
('as everyone knows',
according to Russell)
believed that
'all things
are numbers'.
 
Everything
in the world,
whether it be
the building of pyramids,
the things of nature,
the harmonies of music,
or whatever,
expresses a series

of numerical relations,
and can be
described
by those relations.
 
The tragedy
for the Pythagoreans
(and,
as we shall see,
a similar tragedy
was played out
in Russell's own
philosophical development)
was
that their greatest,
most well-known discovery
was the one
that undermined
this point of view:
namely
the famous
Pythagorean Theorem
concerning
right-angled triangles,
which led immediately
to the discovery
of incommensurables.
 
According to
the Pythagorean Theorem,
the length of the hypotenuse
of a right-angled triangle
in which the other two sides
are
one unit long
will be equal to
the square root of 2.
 
The trouble
is that the square root of 2
is
incommensurable;
that is,
it cannot be expressed
as the relation
between two numbers,
or,
to put it another way,
it is
'irrational'.
 
It follows
that there is
at least
one thing
in the world
which is
not
the expression
of a numerical relation.
 
Others, of course,
followed;
the best known of which
is pi,
the relation
between
the circumference
and
the diameter
of
a circle.
 
To the ancient Greeks,
this suggested
that geometry,
not arithmetic,
was the surest source
of exact knowledge,
which is one reason
for the pre-eminence
given to Euclid's Elements.
 
The Pythagorean Dream
of showing everything
to be reducible
to arithmetic
was, it seemed,
over."
(p. 10)
 
"The problem
of incommensurables,
however,
continued
to haunt those
who looked
to mathematics
for
perfect rigor
and
exactitude.
 
Quantities like
the square root of 2
and pi
were included
in the domain
of 'real' numbers,
though
no satisfactory definition of them --
or, therefore, of the notion
of a 'real number' in general --
was yet available.
 
And, indeed,
the new techniques
brought with them
further problems
which
opened up the science
of mathematics
to the charge
of
being riddled
with
inconsistencies.
 
Three fundamental notion
 in mathematics --
infinity,
the
infinitesimal,
and
continuity --
seemed
inherently
paradoxical.
 
The paradoxes
of infinity
and continuity
had been known
since ancient times,
but they acquired
a new importance
as
the power of mathematics
to represent
continuous
and
infinite sequences
grew."
(p. 10 - 11)
 
"... the notion
of
an infinitesimal ...
[...]
What are
these 'evanescent Increments'
used
in the calculus?
Berkeley sneered.
 
'They are neither
finite
Quantities,
nor Quantities
 infinitely small
nor yet
not
nothing.
 
May we not call them
the Ghosts
of departed Quantities?'
 
Anyone
who could
accept
such a notion,
Berkeley suggested,
ought to have
no qualms
in
accepting
the mysteries
of Christianity,
for
do not mathematicians
have
their own mysteries,
'and
what is more,
their repugnancies
and
contradictions?'
(p. 13)
 
"Those who taught me
the
infinitesimal Calculus
did not know
the valid proofs
of
its fundamental theorems
and tried to
persuade me
to accept
the official sophistries
as an
act of faith.
 
I realized that
the calculus works
in practice,
but I was at a loss
to
understand
why
it should do so.
 
However
I found
so much pleasure
in the acquisition
of technical skill
that
at most times
I forgot my doubts."
[from "My Philosophical
Development",
1959, p. 35 - 36]
(p. 14)
 
"... The mathematical teaching
at Cambridge
when I was an undergraduate
was definitely bad."
[from "My Philosophical
Development",
1959, p. 37]
(p. 14)
 
"The 'proofs'
that were offered
of mathematical theorems
were
an insult
to
the logical intelligence.
 
Indeed,
the whole subject
of mathematics
was taught
as a set
of clever tricks
by which
to pile up marks [...]
 
The effect
of all this
upon me
was
to make me
think mathematics
disgusting.
 
When I
had finished [...]
I sold
all
my
mathematical books
and
made a vow
that I
would never look
at a
mathematical book
again.
 
And so,
in my fourth year,
I plunged
with whole-hearted delight
into the
fantastic world
of
philosophy."
[from "My Philosophical
Development",
1959, p. 37 - 38]
 
"Kant concluded
that Euclidean geometry
describes
not the world as it is
in itself,
but the world
as it appears to us.
 
The world
does not have to be
as Euclid describes it,
but we
have to see and imagine it
as such.
 
We look at the world,
so to speak,
through Euclidean spectacles.
 
Or,
to put it into
Kantian jargon,
what
Euclidean geometry
describes
is
our
'form of intuition'
with regard
to space.
 
That is why
the theorems
of
Euclidean geometry
look to us
as if
they were
necessarily true,
as if,
like the principles
of logic,
their
truth
was
guaranteed
by
the
nature of reason
itself."
(p. 16)
 
"This also
threatens
the thought
that had
excited
the eleven-year-old
Bertrand Russell,
the
thought
that
we can know,
a priori
and with
complete certainty
and
exactitude,
the
spatial relations
that exist
in
the
physical world."
[p. 16]
 
"Whatever
real
physical space is like,
Russell maintained,
it cannot be
like the surface
of an egg.
 
Unfortunately
for this view,
the space
of relativity theory
is
like
the surface
of an egg,
its curvature
varying
with respect to
varying degrees
of
mass gravitational force.
 
Russell's
earliest published
philosophical theory,
therefore,
is
now regarded
as
one of the few
philosophical theories
capable
of
conclusive
scientific
refutation."
(p. 17)
 
"'...all reality
is
rational
and
righteous...
the
highest object
of
philosophy
is
to indicate to us
the
general nature
of
an ultimate harmony,
the
full content of which
it has not yet
entered into our hearts
to
conceive'.
 
'All
true
philosophy',
[J.M.E.]
McTaggart
declares,
'must be
mystical,
not indeed
in its methods,
but
in
its
final
conclusions.'"
(p. 19)
 
+++
 
Selected Quotations
from
"The Cosmic Code:
Quantum Physics
as the
Language of Nature",
by Heinz R. Pagels,
Bantum  publishers,
1982
 
"Grasping
quantum reality
requires
changing
from
a reality
that can be seen
and felt
to
an
instrumentally detected
reality
that
can be perceived
only
intellectually."
(p. xiii)
 
"Quantum
reality
is
rational
but not
visualizable."
(p. xiii)
 
"... the space
of our universe
is
non-Euclidean;
it is not
flat."
(p. 31)
 
"The young
Einstein
was
a bohemian
and
a rebel
who
identified
himself
with
the highest
and
best
in
human thought."
(p. 22)
 
+++
 
"As far as
the
laws of mathematics
refer to
reality,
they
are
not certain;
as far as
they are
certain,
they
do not
refer
to
reality."
( -- Albert Einstein,
found online at:

 
+++